John Larkin, Dremeling PCBs...

[John Larkin]

On Fri, 4 Nov 2022 12:00:10 -0700 (PDT), Lamont Cranston
<amdx62@gmail.com> wrote:

On Friday, November 4, 2022 at 12:10:44 PM UTC-5, John Larkin wrote:

My daughter has been a Dentist for about 6 months now, I got some used bits when she was in dental school.
I\'ll specifically ask her for round end burrs. I should get something for my $260k in tuition payments!
Mikek
My kid went to Cornell at full price. She dual-majored in softball and
beer pong.

Mine had a degree in horticulture and agri-business, worked 3 years doing very well and the then the company merged with another and new management changed all the good things. She decided to go back to school to become a dentist. Two years of premed, a masters and then dental school.
As I have said, she has some bad ass sticktoitness!
Mikek

The Brat worked for us doing assembly and stuff. Then she went to
Berkeley and got an MBA and now I work for her.

 

[John Larkin]

On Fri, 04 Nov 2022 09:51:33 -0700, John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote:

On Fri, 4 Nov 2022 09:43:36 -0700 (PDT), Lamont Cranston
amdx62@gmail.com> wrote:

On Friday, November 4, 2022 at 10:48:13 AM UTC-5, John Larkin wrote:

Do you mean an abrasive disc? It will load up with copper, and it
can\'t cut sharp corners.

https://www.dropbox.com/s/yd19osiwz1z74s4/HV_Proto_2.JPG?raw=1

I was going to ask if that was directed at me, then I saw the previous post.

No, that was a response to Always Wrong, who is an authority on
everything but designs nothing.

Anyway here\'s what I used, it\'s 0.35\" diameter.
https://www.dropbox.com/s/80ym98ms3sp5udp/Dental%20biy%200.035%20in.jpg?dl=0
Mikek

The small round-end burrs are harder to find but cut traces much
better.

No, cut trenches. You have to think backwards.

 

[Clifford Heath]

On 5/11/22 03:04, Jeroen Belleman wrote:

On 2022-11-04 16:54, Lamont Cranston wrote:
On Friday, November 4, 2022 at 10:38:54 AM UTC-5, John Larkin wrote:

Post a picture and we can discuss it.

  Well, I\'m not proud to put this out, but...
https://www.dropbox.com/s/y6zibg202dk83sv/High%20input%20impedance%20PCB%20with%20parts.jpg?dl=0

  You mention round tip, that may help a little.
  I drew mine out in paint and glued it to the PCB, then followed the
lines, (apparently drunkenly!)
https://www.dropbox.com/s/rc4lsdg8ltyvc3x/H%20I%20I%20amp.jpg?dl=0
                                 Mikek


Maybe some pantograph arrangement would be handy. Make a scale 2 sketch
and follow the lines using a ruler.

I wanted to put my Dremel into the drill stand and use an X-Y stage.
Set the bit depth precisely and rig a foot pedal for up/down.

And then my Dremel burnt out again, after less than ten minutes light
use from new. I was reluctant to reward the company by buying another.

Clifford Heath.

 

[LM]

Do your Dremels vibrate? Mines vibrate too much for a good work?
That\'s different vibration than my hands might do.

On Fri, 04 Nov 2022 09:44:06 -0700, John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote:

On Fri, 4 Nov 2022 08:54:51 -0700 (PDT), Lamont Cranston
amdx62@gmail.com> wrote:

On Friday, November 4, 2022 at 10:38:54 AM UTC-5, John Larkin wrote:

Post a picture and we can discuss it.

Well, I\'m not proud to put this out, but...
https://www.dropbox.com/s/y6zibg202dk83sv/High%20input%20impedance%20PCB%20with%20parts.jpg?dl=0
You mention round tip, that may help a little.

That\'s not bad. If the traces are a little ragged I\'ll pretty them up
with an x-acto knife. I do work mostly surface-mount. Surface mount,
63/37 solder, gold FR4, wash off the flux, practically jewelry.

I drew mine out in paint and glued it to the PCB, then followed the lines, (apparently drunkenly!)
https://www.dropbox.com/s/rc4lsdg8ltyvc3x/H%20I%20I%20amp.jpg?dl=0
Mikek

I use a Sharpie and sometimes a ruler to make nice straight lines
before I cut. Visually, little wobbles don\'t look bad but long slopes
do.

Alcohol has an optimum point, about 1 oz for me, dremeling or skiing.

https://www.amazon.com/Drunk-Sipped-Danced-Stumbled-Civilization/dp/0316453358/ref=sr_1_1?crid=1OT62WS7VOBOS&keywords=book+drunk&qid=1667579971&qu=eyJxc2MiOiIxLjA2IiwicXNhIjoiMC45MSIsInFzcCI6IjAuMDAifQ%3D%3D&sprefix=book+drunk%2Caps%2C141&sr=8-1

 

[John Larkin]

On Fri, 04 Nov 2022 23:59:10 +0200, LM <sala.nimi@mail.com> wrote:

Do your Dremels vibrate? Mines vibrate too much for a good work?
That\'s different vibration than my hands might do.

No vibration problem. My biggest issue is maintaining good depth,
Z-axis control.

 

[Don]

Lamont Cranston wrote:

John Larkin wrote:

My daughter has been a Dentist for about 6 months now, I got some used
bits when she was in dental school.
I\'ll specifically ask her for round end burrs. I should get something for
my $260k in tuition payments!
Mikek
My kid went to Cornell at full price. She dual-majored in softball and
beer pong.

Mine had a degree in horticulture and agri-business, worked 3 years doing
very well and the then the company merged with another and new management
changed all the good things. She decided to go back to school to become a
dentist. Two years of premed, a masters and then dental school.
As I have said, she has some bad ass sticktoitness!
Mikek

Awesome! Who\'s Lamont Cranston?

Danke,

--
Don, KB7RPU, https://www.qsl.net/kb7rpu
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.

 

[whit3rd]

On Saturday, November 5, 2022 at 6:12:08 AM UTC-7, Don wrote:

Lamont Cranston wrote:

Awesome! Who\'s Lamont Cranston?

Who knows? The Shadow knows.

 

[Anthony Stewart]

When we were using RF ceramic hybrids in the 90\'s, I could do rework with new diamond grinder/cutter samples from my Dentist, that said he did not need. Come to think of it his last name was also Diamond. But 25k to 35k is slow compared to 65k RPM for needle-sized cutters.

I have a friend who made a mini CNC to cut gaps to route tracks on blank copper boards and mill slots and edges in PCB\'s. . He added a large axial coupler to get the tight smooth bearings he wanted for resonant-free routing..

 

[Anthony Stewart]

My oldest didn\'t finish high school until age 23 with adult education. Then went to work as a gaffer, roofer, finishing carpenter, and now built his own new millwork factory and office and expects to make $1m in his 1st year with custom kitchen awards and a good relationship with a Arch. firm with 30 designers . His custom design with software is only part of the job. It is fully integrated 3D CAD-CAM, Assy Sequence dwgs, MRB-II accounting software package used =by architects with work in the Okanogan and cloud server in Australia. So they can do a quick design quote with a simulation. Pre-paid or reimbursed. He\'s making me proud.

 

[John Larkin]

On Sat, 5 Nov 2022 13:22:01 -0700 (PDT), Anthony Stewart
<tony.sunnysky@gmail.com> wrote:

When we were using RF ceramic hybrids in the 90\'s, I could do rework with new diamond grinder/cutter samples from my Dentist, that said he did not need. Come to think of it his last name was also Diamond. But 25k to 35k is slow compared to 65k RPM for needle-sized cutters.

I have a friend who made a mini CNC to cut gaps to route tracks on blank copper boards and mill slots and edges in PCB\'s. . He added a large axial coupler to get the tight smooth bearings he wanted for resonant-free routing.

If I can\'t Dremel a board, I just do a pcb layout and order some
multilayer boards with vias and solder mask and all. That\'s easy
nowadays.

 

[Fred Bloggs]

On Friday, November 4, 2022 at 10:54:29 AM UTC-4, Lamont Cranston wrote:

Hi John,
You Dremel carve some pcb test boards. I did my first last night, I got it done, but not the best.
Do you have any hints on how you do it?
Do you have a regular Dremel?
Is it all freehand?
I have dental bits, but many don\'t fit the collets I have, specifically 1/16\" bits.
Do you have a source of collets.

Thanks, Mikek

Wear googles

 

[Lasse Langwadt Christensen]

lørdag den 5. november 2022 kl. 02.09.43 UTC+1 skrev John Larkin:

On Fri, 04 Nov 2022 23:59:10 +0200, LM <sala...@mail.com> wrote:

Do your Dremels vibrate? Mines vibrate too much for a good work?
That\'s different vibration than my hands might do.
No vibration problem. My biggest issue is maintaining good depth,
Z-axis control.

something like this: https://www.amazon.com/Proxxon-27106-PROXXON-Engraving-Device/dp/B00JVSZXF4
would give you a fixed Z and you can run the stylus against a straight edge to make straight lines

 

[John Larkin]

On Sun, 6 Nov 2022 06:51:36 -0800 (PST), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

lørdag den 5. november 2022 kl. 02.09.43 UTC+1 skrev John Larkin:
On Fri, 04 Nov 2022 23:59:10 +0200, LM <sala...@mail.com> wrote:

Do your Dremels vibrate? Mines vibrate too much for a good work?
That\'s different vibration than my hands might do.
No vibration problem. My biggest issue is maintaining good depth,
Z-axis control.

something like this: https://www.amazon.com/Proxxon-27106-PROXXON-Engraving-Device/dp/B00JVSZXF4
would give you a fixed Z and you can run the stylus against a straight edge to make straight lines

Freehand under my Mantis is quick and easy. Sometimes I modify a
prototype after the parts are installed, and it\'s all wired up to
power suplies and instruments and would be a nuisance to move.

I had some vision issues that wrecked my depth perception, but that\'s
getting better. The Mantis magnifier provides lots of working distance
and startling depth perception.

I still draw schematics on paper, and freehand Dremeling has the same
feel.

 

[John Larkin]

On Sun, 6 Nov 2022 05:55:12 -0800 (PST), Fred Bloggs
<bloggs.fredbloggs.fred@gmail.com> wrote:

On Friday, November 4, 2022 at 10:54:29 AM UTC-4, Lamont Cranston wrote:
Hi John,
You Dremel carve some pcb test boards. I did my first last night, I got it done, but not the best.
Do you have any hints on how you do it?
Do you have a regular Dremel?
Is it all freehand?
I have dental bits, but many don\'t fit the collets I have, specifically 1/16\" bits.
Do you have a source of collets.

Thanks, Mikek

Wear googles

The Mantis has a hood you stick your face into.

https://www.dropbox.com/s/wlim2da8cv9q6fj/Bench_Mantis.jpg?raw=1

It\'s great for probing small stuff too. And for taking pictures.

https://www.dropbox.com/s/fp88o2rqgr87g9d/Mantis2.JPG?raw=1

 

[server]

whit3rd <whit3rd@gmail.com> wrote in
news:2b8113d6-a9b3-4e12-a980-e736fda97854n@googlegroups.com:

On Friday, November 4, 2022 at 8:48:13 AM UTC-7, John Larkin
wrote:
On Fri, 4 Nov 2022 15:34:38 -0000 (UTC),
DecadentLinux...@decadence.org wrote:

Use the little concrete cut-off saw. it is abrasive. I would not
use any steel type cutter or mill... ever.
Do you mean an abrasive disc? It will load up with copper, and it
can\'t cut sharp corners.

https://www.dropbox.com/s/yd19osiwz1z74s4/HV_Proto_2.JPG?raw=1

Well, it can certainly cut sharp metal corners; it\'s the CUT path
that isn\'t sharp cornered, not t he result when you intersect a
N/S with an E/W cut. The loading can be treated by using the
little abrasive stone (that used to come with Dremel tools) to
dress the disc. Don\'t try that on a metal burr, of course.

Biggest problem with abrasive disk: the pesky powder/grit
residues.

Not the abrasive disc. The little \"concrete saw\". Yes, it too is
\"an abrasive disc\", but not like the actual \"grinding wheel\" type in
Dremel kits. And those bind up with copper and solder fast.

And yes \"inside corners\" are not for this. It is for the long
runs. For the corners I use the high precision bur they sell that
has a flat face.

<https://www.amazon.com/Dremel-9901HP-Tungsten-Carbide-
Carving/dp/B096BSXB63>

It will get you in there for those last few bits of an inside
corner. For stuff that is not too dense with adjacent traces, I go
back to the old tape days when everything had rounded corners and no
sharp \"radiators\" on traces. A bit more time consuming, but a less
noisy board from an emissions POV. They have a conical end bit that
might go a bit tighter.

And I did HV for a number of years, so pointy turns and nodes were
not a good thing if high potentials were pushing electrons around
past each other. You find a fab house that does not mess with your
gerber data or switch up any of your layout\'s pads, etc. We had
boards that had bare sections (no mask) and slots between nodes (HV
Diodes and caps).

Even did buried slots to make little stripline variants. Put that
in your frequency counter and smoke it.

 

[server]

whit3rd <whit3rd@gmail.com> wrote in news:a197d762-e579-4613-949d-
d957b603fd08n@googlegroups.com:

On Saturday, November 5, 2022 at 6:12:08 AM UTC-7, Don wrote:
Lamont Cranston wrote:

Awesome! Who\'s Lamont Cranston?

Who knows? The Shadow knows.

Somebody with the first name of Lamont and the last name of Cranston?

 

[server]

John Larkin <jlarkin@highlandSNIPMEtechnology.com> wrote in
news:t1kdmhpjnjrg2s2r922b1u6n637nea06na@4ax.com:

If I can\'t Dremel a board, I just do a pcb layout and order some
multilayer boards with vias and solder mask and all. That\'s easy
nowadays.

Yep, and quick turn and cheap, and if you go with that design, they\'ll
ramp up for you at a better price too.

 

[whit3rd]

On Sunday, November 6, 2022 at 12:41:12 PM UTC-8, DecadentLinux...@decadence.org wrote:

whit3rd <whi...@gmail.com> wrote in news:a197d762-e579-4613-949d-
d957b6...@googlegroups.com:
On Saturday, November 5, 2022 at 6:12:08 AM UTC-7, Don wrote:
Lamont Cranston wrote:

Awesome! Who\'s Lamont Cranston?

Who knows? The Shadow knows.

Somebody with the first name of Lamont and the last name of Cranston?

A fictional someone, actually. Hear all about it here

<https://www.oldradioworld.com/media/The%20Shadow%201948-02-29%20The%20Man%20Who%20Was%20Death.mp3>

 

[Clifford Heath]

On 7/11/22 07:41, DecadentLinuxUserNumeroUno@decadence.org wrote:

whit3rd <whit3rd@gmail.com> wrote in news:a197d762-e579-4613-949d-
d957b603fd08n@googlegroups.com:

On Saturday, November 5, 2022 at 6:12:08 AM UTC-7, Don wrote:
Lamont Cranston wrote:

Awesome! Who\'s Lamont Cranston?

Who knows? The Shadow knows.


Somebody with the first name of Lamont and the last name of Cranston?

He signed off his messages with \"Mikek\" and we\'ve all seen that before.

 

[Lamont Cranston]

On Sunday, November 6, 2022 at 4:23:32 PM UTC-6, Clifford Heath wrote:

On 7/11/22 07:41, DecadentLinux...@decadence.org wrote:
whit3rd <whi...@gmail.com> wrote in news:a197d762-e579-4613-949d-
d957b6...@googlegroups.com:

On Saturday, November 5, 2022 at 6:12:08 AM UTC-7, Don wrote:
Lamont Cranston wrote:

Awesome! Who\'s Lamont Cranston?

Who knows? The Shadow knows.


Somebody with the first name of Lamont and the last name of Cranston?
He signed off his messages with \"Mikek\" and we\'ve all seen that before.

Ya, I\'m posting from my google groups account because I still haven\'t solved my F\'ing
Thunderbird problem. As I have said since I had a friend that spent most of his time installing
dozens of different modified versions of Windows,
\"I want to use a computer not fix a computer.\"
Mikek
When I was a youngster, my best friends dad used the line \"Who knows what evil lurks in the hearts of men? The Shadow knows!\"
And it stuck in my mind even though I don\'t think I have ever heard the show.
But I do listen to a lot of old radio using an app on my phone. I like Gunsmoke, Dragnet, Johnny Dollar, Six shooter, Let George do it, Philo Vance,
Richard Diamond Private detective and many more. I listen to much more old radio programs than watch TV.
Anyone remember Eve Arden from \"Our Mrs. Brooks\" and many movies? She\'s a female actor from long ago that stays with me.
Mikek