extrusions

[John Larkin]

On Thu, 9 May 2019 22:10:56 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:

On Thursday, May 9, 2019 at 9:09:57 PM UTC-7, John Larkin wrote:

Here's the old one. It's pretty horrible.

https://www.dropbox.com/s/9z8uqsq3let67gs/Tbox_Extrusion_Old.JPG?dl=0

The screw locations are inconsistent and the self-tapping screws make
shavings.

One way around that, is to ditch the 'self-tapping screws', and instead
press knurled studs into the apertures. That doesn't make any metal
shavings, the knurled insert can either be an innie (takes a machine
screw) or an outie (has a projecting stud). If you decide on a full-custom
profile, that can be a dimension to design in.

Another is the RivNut (or other captive nut designs) after punching or drilling
a sheet element, but that doesn't easily attach end plates/endcaps.
Mostly, I find threads in aluminum to be problematic.

One problem with inserts is that the holes are really tucked into the
corners, so there's not much room to work. We need threaded holes for
the top and bottom covers too, which wouldn't work well with inserts.
Those dimensions (we want to use our existing end plates) also keep us
from making the whole thing out of sheet metal.

N/C drilling and tapping aluminum isn't bad.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[John Larkin]

On Fri, 10 May 2019 15:35:19 +1000, Clifford Heath
<no.spam@please.net> wrote:

On 10/5/19 3:10 pm, whit3rd wrote:
Mostly, I find threads in aluminum to be problematic.

Aluminium is so difficult because of the big difference between the
softness of the metal and the hardness of the oxide.

We'd drill and tap the aluminum *after* it's anodized!


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[John Larkin]

On Fri, 10 May 2019 15:10:16 +1000, Clifford Heath
<no.spam@please.net> wrote:

On 10/5/19 2:09 pm, John Larkin wrote:
On Thu, 9 May 2019 23:29:59 -0400, "Carl"
carl.ijamesXYZ@ZYXverizon.net> wrote:
So you are thinking of a C channel as wide as your box, with short legs to
form the sides?

Here's the old one. It's pretty horrible.
https://www.dropbox.com/s/9z8uqsq3let67gs/Tbox_Extrusion_Old.JPG?dl=0

The screw locations are inconsistent and
the self-tapping screws make shavings.

Don't use self-tapping screws. Not only do they make shavings, but they
work loose, and can make new shavings each time the box must be opened
and re-closed.

That box uses the self-tapping screws to bite into the top cover too.
That keeps it from rattling and maybe provides grounding. Clever but
flawed.

Self-tappers are bloody awful things that no professional should use.
Use thread-rolling screws instead, e.g. (Note that these are trilobular;
slightly triangular cross-section; the roll the metal aside):
http://www.shamrockexpress.com/screws-screws-for-metal-pan-head-phillips-steel-zinc-0404rpp.html


https://www.dropbox.com/s/qpl3dtoapgzd9kp/Tbox_Extrusion.JPG?dl=0
All the tapped holes would be machined in solid areas

Nice, but you don't need to tap the holes (leaving swarf that might or
might not get cleaned off properly) if you use thread-rolling screws.
The first insertion will make the thread without producing swarf.

That would take muscle that some of my tiny assembler ladies don't
have. May as well have a machine shop n/c drill and tap clean holes,
and use regular s/s machine screws.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Rick C]

On Friday, May 10, 2019 at 9:37:26 AM UTC-4, George Herold wrote:

On Thursday, May 9, 2019 at 9:08:13 PM UTC-4, Rick C wrote:
On Thursday, May 9, 2019 at 8:06:36 PM UTC-4, George Herold wrote:
On Thursday, May 9, 2019 at 5:42:53 PM UTC-4, John Larkin wrote:
On Thu, 9 May 2019 13:04:04 -0700 (PDT), jurb6006@gmail.com wrote:

On Thursday, May 9, 2019 at 12:37:05 PM UTC-5, John Larkin wrote:
Can anyone recommend a good, reasonably priced source for small custom
aluminum extrusions?


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

Try Tendon Manufacturing in Cleveland if that is viable for you. Get ahold of Jim Moderelli and tell him Jeff sent you. He is not necessarily in sales, he is like an all around guy for them. Probably does expediting and whatever because he does go on the road and he does have skills. So that is a reasonable assumption.

https://www.tendon.com/

On their homepage of the graphics, at the top right, or third on because who knows your screen resolution, they give the info.

Actually, if you only need a few pieces and they aren't all that hard I might be able to get them out of there under the table. they do let him do that from time to time. Then all we have to pay is him.

I also got a guy very adept with Rhinoceros and Solidworks. He can probably bust out code faster than almost anyone on those. You probably don't need him though, you probably have the drawings, but if they want any significant extra charges find out why and I can tell him the problem.

It's like - how many pieces are we talking here and what do they look like ? he can do jet engine impellers or coffee pots, where does this stand in that spectrum ?


We're tired of buying stock extruded enclosures that are expensive and
poorly designed. It's time we did our own extrusions. We could buy a
truckload.

It would basically be the sides of something like this

http://www.highlandtechnology.com/DSS/T564DS.shtml

We'd make the top/bottom/ends out of flat sheets, to make it easier to
work on.

We'll ping Jim. Thanks.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

Sometime in the past I recall browsing the various extrusions
that were available...
there were hundreds/ thousands at each extrusion place!

thread bend;
I've got a dream of milling bath-tubs out of aluminum bar stock.
Five sided boxes with a top panel. Nice thick sides
that you can add connectors or heat sink tabs onto the
box. Say a 3" width, 2" depth to the tub. and you could
make various lengths. Like blue pomona boxes, but better.
(and hopefully cheaper.) With small companies you sometimes
have to buy a life time supply of something, to keep the price
down for your customers. (or because the something is going away,
and finding a replacement may not be possible.)

I've always wondered how people know how long they will live to buy a lifetime supply. Or in this case, how they know how long the product will live?

Our products tend to have a long life... say 10-20 years, x average sales
per year x some fudge factor.. depending on price. If it's cheap
might as well by a bunch. If it's spendy you sharpen your pencil.

Seems like you have small variations in sales. Here it is feast or famine. I provide product to a major networking company so I have neither insight into nor influence of sales. One year can be bumper crop another zip. They can potentially never buy another product. How do you come up with a lifetime buy for that?

--

Rick C.

+ Get a 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

 

[George Herold]

On Friday, May 10, 2019 at 12:26:59 PM UTC-4, Rick C wrote:

On Friday, May 10, 2019 at 9:37:26 AM UTC-4, George Herold wrote:
On Thursday, May 9, 2019 at 9:08:13 PM UTC-4, Rick C wrote:
On Thursday, May 9, 2019 at 8:06:36 PM UTC-4, George Herold wrote:
On Thursday, May 9, 2019 at 5:42:53 PM UTC-4, John Larkin wrote:
On Thu, 9 May 2019 13:04:04 -0700 (PDT), jurb6006@gmail.com wrote:

On Thursday, May 9, 2019 at 12:37:05 PM UTC-5, John Larkin wrote:
Can anyone recommend a good, reasonably priced source for small custom
aluminum extrusions?


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

Try Tendon Manufacturing in Cleveland if that is viable for you. Get ahold of Jim Moderelli and tell him Jeff sent you. He is not necessarily in sales, he is like an all around guy for them. Probably does expediting and whatever because he does go on the road and he does have skills. So that is a reasonable assumption.

https://www.tendon.com/

On their homepage of the graphics, at the top right, or third on because who knows your screen resolution, they give the info.

Actually, if you only need a few pieces and they aren't all that hard I might be able to get them out of there under the table. they do let him do that from time to time. Then all we have to pay is him.

I also got a guy very adept with Rhinoceros and Solidworks. He can probably bust out code faster than almost anyone on those. You probably don't need him though, you probably have the drawings, but if they want any significant extra charges find out why and I can tell him the problem.

It's like - how many pieces are we talking here and what do they look like ? he can do jet engine impellers or coffee pots, where does this stand in that spectrum ?


We're tired of buying stock extruded enclosures that are expensive and
poorly designed. It's time we did our own extrusions. We could buy a
truckload.

It would basically be the sides of something like this

http://www.highlandtechnology.com/DSS/T564DS.shtml

We'd make the top/bottom/ends out of flat sheets, to make it easier to
work on.

We'll ping Jim. Thanks.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

Sometime in the past I recall browsing the various extrusions
that were available...
there were hundreds/ thousands at each extrusion place!

thread bend;
I've got a dream of milling bath-tubs out of aluminum bar stock.
Five sided boxes with a top panel. Nice thick sides
that you can add connectors or heat sink tabs onto the
box. Say a 3" width, 2" depth to the tub. and you could
make various lengths. Like blue pomona boxes, but better.
(and hopefully cheaper.) With small companies you sometimes
have to buy a life time supply of something, to keep the price
down for your customers. (or because the something is going away,
and finding a replacement may not be possible.)

I've always wondered how people know how long they will live to buy a lifetime supply. Or in this case, how they know how long the product will live?

Our products tend to have a long life... say 10-20 years, x average sales
per year x some fudge factor.. depending on price. If it's cheap
might as well by a bunch. If it's spendy you sharpen your pencil.

Seems like you have small variations in sales. Here it is feast or famine. I provide product to a major networking company so I have neither insight into nor influence of sales. One year can be bumper crop another zip. They can potentially never buy another product. How do you come up with a lifetime buy for that?

Sales here are very noisy!* For the last ~5 years we've been selling 1-3
Optical pumping a year. (it's a product that is 'long in the tooth'
early in it's life it sold ~10-15 per year) This year there has been a
rush and I'm working on the 7th one so far. (which has sent me scrambling
a bit to re-stock stuff.) A life time buy is always a guess.

George H.
*mostly because the volume is low...

--

Rick C.

+ Get a 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

 

[Joseph Gwinn]

On May 9, 2019, John Larkin wrote
(in article<a7p8de9dmohflp9nscvde6q9n1peidttcr@4ax.com&gt:

Can anyone recommend a good, reasonably priced source for small custom
aluminum extrusions?

What is the volume per year? This determines the best approach.

For small production runs, CNC milling from plate is usually cheapest.

As for the threaded bosses, use a CNC threadmill cutter to form helicoil
threads, and then install helicoils. These will accept ordinary machine
screws, and the female threads will never wear out.

If there is any exposure to the elements, install the helicols "wet"
(meaning dipped in catalyzed polysulfide rubber before installation). This
fills all the nooks and crannies with cured polysulfide rubber, excluding
water et al.

The above process is commonplace in MIL-SPEC systems.

Joe Gwinn

 

[Rick C]

On Friday, May 10, 2019 at 12:55:46 PM UTC-4, George Herold wrote:

On Friday, May 10, 2019 at 12:26:59 PM UTC-4, Rick C wrote:
On Friday, May 10, 2019 at 9:37:26 AM UTC-4, George Herold wrote:
On Thursday, May 9, 2019 at 9:08:13 PM UTC-4, Rick C wrote:
On Thursday, May 9, 2019 at 8:06:36 PM UTC-4, George Herold wrote:
On Thursday, May 9, 2019 at 5:42:53 PM UTC-4, John Larkin wrote:
On Thu, 9 May 2019 13:04:04 -0700 (PDT), jurb6006@gmail.com wrote:

On Thursday, May 9, 2019 at 12:37:05 PM UTC-5, John Larkin wrote:
Can anyone recommend a good, reasonably priced source for small custom
aluminum extrusions?


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

Try Tendon Manufacturing in Cleveland if that is viable for you. Get ahold of Jim Moderelli and tell him Jeff sent you. He is not necessarily in sales, he is like an all around guy for them. Probably does expediting and whatever because he does go on the road and he does have skills. So that is a reasonable assumption.

https://www.tendon.com/

On their homepage of the graphics, at the top right, or third on because who knows your screen resolution, they give the info.

Actually, if you only need a few pieces and they aren't all that hard I might be able to get them out of there under the table. they do let him do that from time to time. Then all we have to pay is him.

I also got a guy very adept with Rhinoceros and Solidworks. He can probably bust out code faster than almost anyone on those. You probably don't need him though, you probably have the drawings, but if they want any significant extra charges find out why and I can tell him the problem.

It's like - how many pieces are we talking here and what do they look like ? he can do jet engine impellers or coffee pots, where does this stand in that spectrum ?


We're tired of buying stock extruded enclosures that are expensive and
poorly designed. It's time we did our own extrusions. We could buy a
truckload.

It would basically be the sides of something like this

http://www.highlandtechnology.com/DSS/T564DS.shtml

We'd make the top/bottom/ends out of flat sheets, to make it easier to
work on.

We'll ping Jim. Thanks.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

Sometime in the past I recall browsing the various extrusions
that were available...
there were hundreds/ thousands at each extrusion place!

thread bend;
I've got a dream of milling bath-tubs out of aluminum bar stock.
Five sided boxes with a top panel. Nice thick sides
that you can add connectors or heat sink tabs onto the
box. Say a 3" width, 2" depth to the tub. and you could
make various lengths. Like blue pomona boxes, but better.
(and hopefully cheaper.) With small companies you sometimes
have to buy a life time supply of something, to keep the price
down for your customers. (or because the something is going away,
and finding a replacement may not be possible.)

I've always wondered how people know how long they will live to buy a lifetime supply. Or in this case, how they know how long the product will live?

Our products tend to have a long life... say 10-20 years, x average sales
per year x some fudge factor.. depending on price. If it's cheap
might as well by a bunch. If it's spendy you sharpen your pencil.

Seems like you have small variations in sales. Here it is feast or famine. I provide product to a major networking company so I have neither insight into nor influence of sales. One year can be bumper crop another zip. They can potentially never buy another product. How do you come up with a lifetime buy for that?

Sales here are very noisy!* For the last ~5 years we've been selling 1-3
Optical pumping a year. (it's a product that is 'long in the tooth'
early in it's life it sold ~10-15 per year) This year there has been a
rush and I'm working on the 7th one so far. (which has sent me scrambling
a bit to re-stock stuff.) A life time buy is always a guess.

With an aging product and low volume, why would you want to inventory parts? Why not make a dozen or two units and keep them on the shelf? Parts cost less in quantity, but more importantly, fabrication is cheaper by a long shot. Sounds like you would need to do another build once every two or three years. If there is a particularly costly component, test the units with one component at assembly time and order that part as orders come in.

I think many sellers underestimate a reasonable markup on low volume items. A friend used to sell some widgets to the Feds and priced them at some markup less than 100% of his costs. Then he would have "special" agents at his door at 8 pm asking him to fix a wire. lol I would have been selling these for 200% markup in minimum lots of maybe 50. I'd be happy to offer free repair for minor issues, but they can't even call first???

My friend was amazed that I got almost 300% markup.

--

Rick C.

-- Get a 1,000 miles of free Supercharging
-- Tesla referral code - https://ts.la/richard11209

 

[Clifford Heath]

On 11/5/19 12:47 am, John Larkin wrote:

On Fri, 10 May 2019 15:10:16 +1000, Clifford Heath
no.spam@please.net> wrote:
https://www.dropbox.com/s/qpl3dtoapgzd9kp/Tbox_Extrusion.JPG?dl=0
All the tapped holes would be machined in solid areas

Nice, but you don't need to tap the holes (leaving swarf that might or
might not get cleaned off properly) if you use thread-rolling screws.
The first insertion will make the thread without producing swarf.

That would take muscle that some of my tiny assembler ladies don't
have. May as well have a machine shop n/c drill and tap clean holes,
and use regular s/s machine screws.

Try them. They roll the thread progressively, and the trilobular shape
makes it easier.

 

[Clifford Heath]

On 11/5/19 12:49 am, John Larkin wrote:

On Fri, 10 May 2019 15:35:19 +1000, Clifford Heath
no.spam@please.net> wrote:

On 10/5/19 3:10 pm, whit3rd wrote:
Mostly, I find threads in aluminum to be problematic.

Aluminium is so difficult because of the big difference between the
softness of the metal and the hardness of the oxide.

We'd drill and tap the aluminum *after* it's anodized!

Right, but any exposed metal forms oxide rapidly. The hardness
differential is what causes "galling" and jams tools.

 

[John Larkin]

On Sat, 11 May 2019 14:36:11 +1000, Clifford Heath
<no.spam@please.net> wrote:

On 11/5/19 12:49 am, John Larkin wrote:
On Fri, 10 May 2019 15:35:19 +1000, Clifford Heath
no.spam@please.net> wrote:

On 10/5/19 3:10 pm, whit3rd wrote:
Mostly, I find threads in aluminum to be problematic.

Aluminium is so difficult because of the big difference between the
softness of the metal and the hardness of the oxide.

We'd drill and tap the aluminum *after* it's anodized!

Right, but any exposed metal forms oxide rapidly. The hardness
differential is what causes "galling" and jams tools.

Stainless machine screws work fine in tapped aluminum.

Tapping is no problem with the right tooling and fluids.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Michael Terrell]

On Thursday, May 9, 2019 at 1:37:05 PM UTC-4, John Larkin wrote:

Can anyone recommend a good, reasonably priced source for small custom
aluminum extrusions?

Are you familiar with Magnode, in Trenton, Ohio? I used to help their people to maintain their electronics in Production.
http://www.magnode.com/

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

You sometimes use 'lunatic fringe' in your sig file. Have you ever watched the TV show, Fringe? One of the main characters is a lunatic, and some of his designs are electronic. You can watch all five seasons for free on IMDB.com's Feedive service. Just register for free and enjoy. IMDB is owned by Amazon. I recently finished 'Warehouse 13' and started watching Fringe while recovering from another fall.

https://www.imdb.com/title/tt1119644/episodes?season=1

 

[Lasse Langwadt Christense]

lørdag den 11. maj 2019 kl. 07.01.22 UTC+2 skrev John Larkin:

On Sat, 11 May 2019 14:36:11 +1000, Clifford Heath
no.spam@please.net> wrote:

On 11/5/19 12:49 am, John Larkin wrote:
On Fri, 10 May 2019 15:35:19 +1000, Clifford Heath
no.spam@please.net> wrote:

On 10/5/19 3:10 pm, whit3rd wrote:
Mostly, I find threads in aluminum to be problematic.

Aluminium is so difficult because of the big difference between the
softness of the metal and the hardness of the oxide.

We'd drill and tap the aluminum *after* it's anodized!

Right, but any exposed metal forms oxide rapidly. The hardness
differential is what causes "galling" and jams tools.

Stainless machine screws work fine in tapped aluminum.

Tapping is no problem with the right tooling and fluids.

yep, I find the best fluid for cutting/drilling/tapping aluminium is ethanol

there's also extrusion like these: http://www.schaeffer-ag.de/fileadmin/_processed_/csm_Housing-with-side-profiles_84c1a18753.png

so you can make any size box with just one type of extrusion

 

[John Larkin]

On Sat, 11 May 2019 05:34:29 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

lřrdag den 11. maj 2019 kl. 07.01.22 UTC+2 skrev John Larkin:
On Sat, 11 May 2019 14:36:11 +1000, Clifford Heath
no.spam@please.net> wrote:

On 11/5/19 12:49 am, John Larkin wrote:
On Fri, 10 May 2019 15:35:19 +1000, Clifford Heath
no.spam@please.net> wrote:

On 10/5/19 3:10 pm, whit3rd wrote:
Mostly, I find threads in aluminum to be problematic.

Aluminium is so difficult because of the big difference between the
softness of the metal and the hardness of the oxide.

We'd drill and tap the aluminum *after* it's anodized!

Right, but any exposed metal forms oxide rapidly. The hardness
differential is what causes "galling" and jams tools.

Stainless machine screws work fine in tapped aluminum.

Tapping is no problem with the right tooling and fluids.

yep, I find the best fluid for cutting/drilling/tapping aluminium is ethanol

there's also extrusion like these: http://www.schaeffer-ag.de/fileadmin/_processed_/csm_Housing-with-side-profiles_84c1a18753.png

so you can make any size box with just one type of extrusion

That still has the same bad features that we want to eliminate, the
3/4 closed end plate screw holes in the corner extrusions, and the
sliding top cover that is hard to remove and poorly grounded.

The sides are sliding covers too, even worse for EMI. It looks like,
if you remove the end plates, the whole thing falls apart.




--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[John Larkin]

On Fri, 10 May 2019 23:03:47 -0700 (PDT), Michael Terrell
<terrell.michael.a@gmail.com> wrote:

On Thursday, May 9, 2019 at 1:37:05 PM UTC-4, John Larkin wrote:
Can anyone recommend a good, reasonably priced source for small custom
aluminum extrusions?

Are you familiar with Magnode, in Trenton, Ohio? I used to help their people to maintain their electronics in Production.
http://www.magnode.com/

I'll look them up. Thanks.

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

You sometimes use 'lunatic fringe' in your sig file. Have you ever watched the TV show, Fringe? One of the main characters is a lunatic, and some of his designs are electronic. You can watch all five seasons for free on IMDB.com's Feedive service. Just register for free and enjoy. IMDB is owned by Amazon. I recently finished 'Warehouse 13' and started watching Fringe while recovering from another fall.

https://www.imdb.com/title/tt1119644/episodes?season=1

The "lunatic" sigfile is on my computer at home.

Electronic design requires some of the mental features that, in the
extreme, are called schizophrenia and autism. Leaky brain compartments
and a tendency toward compulsiveness.

I never watch TV. The data rate is too slow.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

On Sat, 11 May 2019 14:35:01 +1000, Clifford Heath
<no.spam@please.net> wrote:

On 11/5/19 12:47 am, John Larkin wrote:
On Fri, 10 May 2019 15:10:16 +1000, Clifford Heath
no.spam@please.net> wrote:
https://www.dropbox.com/s/qpl3dtoapgzd9kp/Tbox_Extrusion.JPG?dl=0
All the tapped holes would be machined in solid areas

Nice, but you don't need to tap the holes (leaving swarf that might or
might not get cleaned off properly) if you use thread-rolling screws.
The first insertion will make the thread without producing swarf.

That would take muscle that some of my tiny assembler ladies don't
have. May as well have a machine shop n/c drill and tap clean holes,
and use regular s/s machine screws.

Try them. They roll the thread progressively, and the trilobular shape
makes it easier.

Yes, that's what we use in extrusions. They go really well into holes
as shown but are really crappy when threaded into slots (right angle
to what's shown).

 

[Clifford Heath]

On 13/5/19 12:14 pm, krw@notreal.com wrote:

On Sat, 11 May 2019 14:35:01 +1000, Clifford Heath
no.spam@please.net> wrote:

On 11/5/19 12:47 am, John Larkin wrote:
On Fri, 10 May 2019 15:10:16 +1000, Clifford Heath
no.spam@please.net> wrote:
https://www.dropbox.com/s/qpl3dtoapgzd9kp/Tbox_Extrusion.JPG?dl=0
All the tapped holes would be machined in solid areas

Nice, but you don't need to tap the holes (leaving swarf that might or
might not get cleaned off properly) if you use thread-rolling screws.
The first insertion will make the thread without producing swarf.

That would take muscle that some of my tiny assembler ladies don't
have. May as well have a machine shop n/c drill and tap clean holes,
and use regular s/s machine screws.

Try them. They roll the thread progressively, and the trilobular shape
makes it easier.

Yes, that's what we use in extrusions. They go really well into holes
as shown but are really crappy when threaded into slots (right angle
to what's shown).

Thanks, that's a good observation. Unsurprising on reflection, since a
triangle has a constant height in rotation - but the centre moves. So
the screw would pull left then right of centre during rotation, and that
wouldn't make a good thread.

 

[John Larkin]

On Mon, 13 May 2019 14:54:43 +0000 (UTC), Hul Tytus <ht@panix.com>
wrote:

John - the companies below are extruders I talked to about 20 years ago,
a couple of them more recently. The names were probably taken from the
Thomas Register, which still exists today, though as a web site rather
than a paper catalog.

Hul

Calex Corp 800-872-2539
Campbell, Oh
Pierce Aluminum 800-336-1358
Canton, Mass
Argyle Industries 908 725 8800
Somerville, NJ
Precision Extrusions 708 766 0340
Bensenville, Ill
Anaheim Extrusion 714 630 3111
Anaheim, CA
Yard Metals 203 589 2386
Bristol, Ct
Lockhart Aluminum 800 -83-lockhart
Pa, Tn, & Tx
International Extrusions 313 427 8700
Garden city, Mi
Custom Aluminum Products
South Elgin, Ill

Cool. I'll pass that on to my mechanical guy. He's always wanted to do
some extrusions.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Hul Tytus]

John - the companies below are extruders I talked to about 20 years ago,
a couple of them more recently. The names were probably taken from the
Thomas Register, which still exists today, though as a web site rather
than a paper catalog.

Hul

Calex Corp 800-872-2539
Campbell, Oh
Pierce Aluminum 800-336-1358
Canton, Mass
Argyle Industries 908 725 8800
Somerville, NJ
Precision Extrusions 708 766 0340
Bensenville, Ill
Anaheim Extrusion 714 630 3111
Anaheim, CA
Yard Metals 203 589 2386
Bristol, Ct
Lockhart Aluminum 800 -83-lockhart
Pa, Tn, & Tx
International Extrusions 313 427 8700
Garden city, Mi
Custom Aluminum Products
South Elgin, Ill

John Larkin <jjlarkin@highland_snip_technology.com> wrote:

Can anyone recommend a good, reasonably priced source for small custom
aluminum extrusions?

--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

>I've always wondered how people know how long they will live to >buy a lifetime supply. Or in this case, how they know how long >the product will live?

Life is apparently a relative term. I had a credit card that was 3.9% fixed for life. Well that turned out to be the life of the bank. they got bought out and went to LIBOR+spread. My rte was still pretty low. I almost decided to reject the new agreement. Many people do not know, if they stick it to you with interest or whatever, you can refuse and you have to make the minimum payments under the old terms and not use the card. I didn't for a while but then there as this time I wanted something and well, this interest is still lower than that interest so I used it. It was still only like 7.5%. That is low for cards I hear.

Tektronix had a lifetime warranty on all their transformers. Well when I called to get one for my 561A they gave me a price and I mentioned that warranty and they said "We've already been to court on that so you're welcome to try".

Like Publisher's Clearinghouse. Seems soem people noticed all the winners of the prize of like $2,500 a week for life were won by old geezers 91 years old with oxygen machines, ostomy bags and catheters hanging off of them - so now they let you assign it for after you die so it is for the assignee's lifetime. I'd find the youngest person I know...

What gets me is those GPS units truck drivers use. Lifetime updates but it is only a couple hundred, like forever. They must be counting on people getting out of the business or retiring, dying or some shit. I'm sure they do not plan on sending free updates in the year 2525.

Lifetime is another word like "free". Yeah, this ten buck thing is yours for free if you pay the shipping. That is ten bucks.

"Lifetime", "Free", "Easy", none of those words have any meaning anymore, they are just advertising jargon.

 

It would basically be the sides of something like this

http://www.highlandtechnology.com/DSS/T564DS.shtml

Timed out on me. Might be the MODEM, I need to find someone to threaten with a weapon of mass destruction, THEY own the MODEM and they want $100 to replace it. I am about to go with Hughesnet and put their MODEM in the middle of Brookpark road in front of the biggest truck I see. Or send it back to fucking ATT with bullet holes in it.

Anyway, you could email me the code, or even a drawing. I can send it to Ted if this doesn't work out. In fact I can just give you his email. But then Tendon might just do, the worst that can happen is they quote and you say no.

If you want, my email is JURB6006 and it is a gmail account so suffix it properly.