OT: How can I glue a broken nylon gear?

Joerg wrote:

Hello Jim,

Have you considered casting your own gear?


That's a good idea. This whole thing came up when our former neighbors
visited last week. The husband said he could probably make a new gear
from brass. I just wanted to see whether there is an easier solution and
I could spare him the trouble. Plus they live across the ocean.

I don't think you can glue nylon.


My gut feeling told me that, too. But engineering minds don't give up
until they know for sure...

Regards, Joerg

http://www.analogconsultants.com
Click to expand...
http://www.jogis-roehrenbude.de/Formteile.htm

Jorgen
 
Hello Jorgen,

http://www.jogis-roehrenbude.de/Formteile.htm
Click to expand...
Thanks! Now that is a very practical cook book style approach, including
hints on where to get all the stuff. The vacuum pump is going to be some
hassle for a one-time job. However, he mentioned that you can get those
at some "adults only" shops. I would have never figured that out. Still,
I won't set foot into one of those establishments.

Regards, Joerg

http://www.analogconsultants.com
 
Joerg <notthisjoergsch@removethispacbell.net> wrote:
The vacuum pump is going to be some hassle for a one-time job.
Click to expand...
It doesn't look like a very hard vacuum is required; a hand vacuum pump
might work. You can get these for around $20 to $30 at the car parts
store or Sears. Some car parts places have a tool rental program and
you might be able to get one that way - typically you put down a deposit
equal to the price of the tool, and you get your money back when you
bring the tool back.

Matt Roberds
 
On Fri, 03 Jun 2005 17:04:09 GMT, the renowned
mroberds@worldnet.att.net wrote:

Joerg <notthisjoergsch@removethispacbell.net> wrote:
The vacuum pump is going to be some hassle for a one-time job.

It doesn't look like a very hard vacuum is required; a hand vacuum pump
might work. You can get these for around $20 to $30 at the car parts
store or Sears.
Click to expand...
Or Harbor Fright.

Some car parts places have a tool rental program and
you might be able to get one that way - typically you put down a deposit
equal to the price of the tool, and you get your money back when you
bring the tool back.

Matt Roberds
Click to expand...
Some people probably use the item and return it. But that would be
wrong.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Hello Spehro,

It doesn't look like a very hard vacuum is required; a hand vacuum pump
might work. You can get these for around $20 to $30 at the car parts
store or Sears.

Or Harbor Fright.
Click to expand...
A while ago they had one for under $10.

Some people probably use the item and return it. But that would be
wrong.
Click to expand...
Some people do that with clothes. That would be even more wrong. But the
shops around here started cracking down on that now.

Regards, Joerg

http://www.analogconsultants.com
 
Joerg wrote:

Wonder why that is nylon while the others are brass ...

Any ideas which adhesive would work here?
Click to expand...
If it is really nylon - nylon 6-6 that is - I heard it can be glued with
a resorcinol glue, which is an old fashioned two pot wood glue, very
dark purple/brown in color. The color explains why it is not used that much.

But if it is not nylon but delrin (poly-acetal) that won't work I suppose.

I'd bet on cyanoacrylate. Use very little; then it won't dissolve much.

However count on it breaking again.


Thomas
 
On Fri, 03 Jun 2005 21:53:07 +0200, Zak <jute@zak.invalid> wrote:

[snip]
I'd bet on cyanoacrylate. Use very little; then it won't dissolve much.

[snip]
Click to expand...

Wet both surfaces, then press firmly together. The "wicking" approach
tends to produce "break-again" joints.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Hello Thomas,

If it is really nylon - nylon 6-6 that is - I heard it can be glued with
a resorcinol glue, which is an old fashioned two pot wood glue, very
dark purple/brown in color. The color explains why it is not used that
much.
Click to expand...
Thanks for the hint. I didn't know that adhesive.

But if it is not nylon but delrin (poly-acetal) that won't work I suppose.

I'd bet on cyanoacrylate. Use very little; then it won't dissolve much.
Click to expand...
It looks like nylon. Could be wrong but Delrin feels differently.

Regards, Joerg

http://www.analogconsultants.com
 
Hello Jim,

Wet both surfaces, then press firmly together. The "wicking" approach
tends to produce "break-again" joints.
Click to expand...
I wish I could but this gear is so small that trying to bend open the
crack might ruin it.

Regards, Joerg

http://www.analogconsultants.com
 
On Fri, 03 Jun 2005 16:14:59 GMT, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Hello Jorgen,

http://www.jogis-roehrenbude.de/Formteile.htm

Thanks! Now that is a very practical cook book style approach, including
hints on where to get all the stuff. The vacuum pump is going to be some
hassle for a one-time job. However, he mentioned that you can get those
at some "adults only" shops. I would have never figured that out. Still,
I won't set foot into one of those establishments.
Click to expand...
For a vacuum you might be able to connect to the manifold of a
running car engine, or boil some water in a pressure cooker until
all the air is displaced with steam, then connect to it and let
it cool. A good news group for this type of question is the below
news group.

rec.crafts.metalworking
 
Si Ballenger wrote:
Joerg wrote:

http://www.jogis-roehrenbude.de/Formteile.htm

Thanks! Now that is a very practical cook book style approach, including
hints on where to get all the stuff. The vacuum pump is going to be some
hassle for a one-time job. However, he mentioned that you can get those
at some "adults only" shops. I would have never figured that out. Still,
I won't set foot into one of those establishments.

For a vacuum you might be able to connect to the manifold of a
running car engine, or boil some water in a pressure cooker until
all the air is displaced with steam, then connect to it and let
it cool. A good news group for this type of question is the below
news group.

rec.crafts.metalworking
Click to expand...
You can get a good vacuum pump online here:

[ http://www.mityvac.com/ ]
[ http://www.mityvac.com/kits.html ]
[ http://www.mityvac.com/kits.html#silverlinevacuumpump ]
[ http://www.mityvac.com/kits.html#07000 ]
[ http://www.mityvac.com/contact.html ]
[ http://mityvacparts.com/ ]
 
Guy Macon wrote:

You can get a good vacuum pump online here:
Click to expand...
And if you want one nearly free, get a compressor from any refrigerator.
These go down to 10 - 20 mmm Hg in my experience - but this was in the
freon era.

Be sure to lead the oily exhaust fumes somewhere they won't do any harm.


Thomas
 
"Robert Latest" <boblatest@yahoo.com> wrote in message
news:slrnd9r2ro.1h0.boblatest@localhost.localdomain...
On 2005-05-31, Joerg <notthisjoergsch@removethispacbell.net> wrote:

That's a great method and I would have done it. But this gear is only
5mm in diameter and 3mm long.

Why don't you look if it is a standard size/module and just buy a
replacement?

BTW, nylon gears are often used to reduce noise.

robert
Click to expand...
ive tried to repair broken teeth on nylon gears before too, i tried several
ways the only one wich worked for any length of time was to cut a slot down
where the tooth was and glue in a pice of fibreglass from a pcb, then file
it to tooth shape.

ive found you can get spare parts for some cordless screwdrivers wich were
surpisingly cheap.

Colin =^.^=
 
Mac wrote:
get polyethylene to stick to itself. There is also a relatively new
adhesive put out by 3M, called Scotch-Weld 8005. It apparently sticks well
to polyethylene (but not nylon :-( ). It is a two part acrylic which
pretty much requires special ($45) pumps for dispensing. McMaster Carr
caries it for those who might be interested.
Click to expand...
In the water-rockets community, we have been using construction-grade
PL Premium (a polyurethane adhesive) to join PETE bottles when making
pressure vessels. It's hard stuff to stick to, but with PLP, ordinary
2L bottles can be joined and withstand 120PSI. We've found nothing else
that works as well, except some epoxies which are more expensive.
 
Joerg wrote:

Hello Jorgen,

http://www.jogis-roehrenbude.de/Formteile.htm


Thanks! Now that is a very practical cook book style approach, including
hints on where to get all the stuff. The vacuum pump is going to be some
hassle for a one-time job. However, he mentioned that you can get those
at some "adults only" shops. I would have never figured that out. Still,
I won't set foot into one of those establishments.

Regards, Joerg
Click to expand...
Another Idea for a vacuum pump* is to use a aquarium (fish tank?)
air pump, those i knew are a diaphragm pump type, which also
creates a vacuum at their air inlet terminal.

Jorgen

* available in stores that usually *EVERYONE* could frequent
without to be embarrassed ;-)
 
Joerg wrote:

Hello Jorgen,

http://www.jogis-roehrenbude.de/Formteile.htm


Thanks! Now that is a very practical cook book style approach, including
hints on where to get all the stuff. The vacuum pump is going to be some
hassle for a one-time job. However, he mentioned that you can get those
at some "adults only" shops. I would have never figured that out. Still,
I won't set foot into one of those establishments.

Regards, Joerg

http://www.analogconsultants.com
Click to expand...

There were some listings for "hydro-aspirator" on eBay that may work.

Also, I remember having an aspirator for a water bed that had standard
garden hose connections all around.

The Fischer catalog lists a new Nalgene Polypropylene aspirator vacuum
pump for $9.60. https://www1.fishersci.com/Coupon?cid=1341&gid=2371008
When finished just liquidate it on eBay.

All of these devices should produce a pressure that is approximately the
vapor pressure of water at whatever the supply temperature is.
 
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