PDA

View Full Version : Source for cheap spur gears?



derekg
12-25-2012, 11:48 AM
A few years ago I came across a very small (micro) bead roller on the odds-n-ends table at Harbor Freight. Like a dumbass, I didn't buy it. I've never been able to find the same model or anything similar. We are now creating a lot of piping for our turbo systems and a nice small bead roller would be perfect for the ends. So, looks like I'll make one. I've found 1/2 bore gears for ~$15 each, but there has to be cheaper ones abound. Any ideas (other than that I am really dumb for not buying the small bead roller in the first place)?

Thanks, Derek

Ohio Mike
12-25-2012, 12:03 PM
I've found 1/2 bore gears for ~$15 each, but there has to be cheaper ones abound.

Honestly $15 sure seems cheap to me.

By chance is this what you're looking for?
http://www.harborfreight.com/18-inch-sheet-metal-fabrication-kit-34104.html

Ian B
12-25-2012, 12:20 PM
Not sure how many teeth you're after, but how about old change wheels from a lathe? Usual sources - Ebay, CL etc.

Ian

derekg
12-25-2012, 12:37 PM
Honestly $15 sure seems cheap to me.

By chance is this what you're looking for?
http://www.harborfreight.com/18-inch-sheet-metal-fabrication-kit-34104.html

Mike, the one I need is about 20% of that size. Those are great, but some of the pipes are only 1" ID and those dies start around 1-1/2".

tdmidget
12-25-2012, 02:00 PM
Possibly old copy/fax machines or similar items?

Guido
12-25-2012, 02:07 PM
http://www.pic-design.com/ and/or http://www.wmberg.com/

If'n you are monkeying around with hot turbos, 15 bucks per anything shouldn't be a worrying point.

--G

vpt
12-25-2012, 04:00 PM
No gears needed.

http://img145.imageshack.us/img145/8144/beadroller006.jpg

http://img406.imageshack.us/img406/2708/beadroller002.jpg

http://img163.imageshack.us/img163/2221/tubingbenderbreakdown01.jpg

http://img694.imageshack.us/img694/2221/tubingbenderbreakdown01.jpg

Boucher
12-25-2012, 05:52 PM
Andy, Thanks for posting that. Very good food for thought. Probably going on the to do list.

Paul Alciatore
12-25-2012, 09:46 PM
OK, OK! Obviously the upper, concave roller must be adjustable in the vertical direction and the bolt on the top is probably for adjusting it. But, how is it mounted to allow this? There are no obvious sliding mechanisms on the outside. At least, none that show in the photos.

So how is it built?

michigan doug
12-26-2012, 08:44 PM
The top shaft must either run in a vertical slot (which you can't see) or could be mounted eccentrically.

I would like to know the particulars though...

doug

Bluechips
12-26-2012, 09:31 PM
there has to be cheaper ones abound. Any ideas

How about the gears out of an old engine oil pump or hydraulic pump?

Mike

Don Young
12-26-2012, 09:36 PM
If you are willing to do some machining then timing gears from a couple of appropriate size engines might do the job. Small engines tend to have straight cut spur gears.

vpt
12-26-2012, 10:18 PM
OK, OK! Obviously the upper, concave roller must be adjustable in the vertical direction and the bolt on the top is probably for adjusting it. But, how is it mounted to allow this? There are no obvious sliding mechanisms on the outside. At least, none that show in the photos.

So how is it built?


The top shaft must either run in a vertical slot (which you can't see) or could be mounted eccentrically.

I would like to know the particulars though...

doug


The top die rides on a shaft, the T-bolt threw the top pushes the shaft and die down, the spring on the end of the shaft keeps the top die against the body and allows for the up/down adjustment.

http://img692.imageshack.us/img692/5466/tubingbenderbreakdown00.jpg

http://img88.imageshack.us/img88/5466/tubingbenderbreakdown00.jpg

http://img233.imageshack.us/img233/2221/tubingbenderbreakdown01.jpg