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View Full Version : Where to Find Miniature Chain / Gears?



Fasttrack
06-18-2010, 08:35 PM
I'm looking for some miniature chain and sprockets. I also need a couple of 32 and 48 dp gears.

Smallparts.com used to have the chain that I want, but they no longer carry it (although they still carry the associated delrin sprockets :confused:). Anyway, they are available from the supplier:

http://servolink.com/prices.htm

And they are damned cheap, but there is a $30 minimum order. I only need two sprockets, four gears and the chain. The total comes to about 6 bucks. :(

So does anyone know of a better source? Alternatively, does anyone else need something off that list? If so maybe we can go in together on an order? If I have to, I guess I'll just buy an assortment of gears/sprockets and figure I'll use them someday.

RKW
06-18-2010, 08:47 PM
I have ordered from these guys (http://www.servocity.com/html/gears___sprockets.html) before. Nice site, good prices, reasonable shipping = great experience.

lazlo
06-18-2010, 09:04 PM
I like Stock Drive Products:

http://www.sdp-si.com/

RKW
06-18-2010, 10:07 PM
I did not mention them since their prices are normally ridiculous. The prices are even higher at W.M Berg so I won't mention them either ;-)


I like Stock Drive Products:

http://www.sdp-si.com/

Guido
06-18-2010, 10:22 PM
http://www.pic-design.com/cgi-bin/lansaweb?webapp=WB2CHMPGE+webrtn=hompge1+ml=LANSA: XHTML+part=DEV+lang=ENG


Good thangs there.

--G

Evan
06-18-2010, 10:39 PM
Check out the bottom of this page:

The chain is .1227" pitch pin to pin.

http://www.jameco.com/Jameco/catalogs/c102/P189.pdf

Fasttrack
06-19-2010, 01:16 AM
Good grief! I will just order from Servolink and I suggest you folks do the same! I priced the same components at those other places and it came to a total of 20 bucks. For 10 extra bucks, I can get about 3 times as many sprockets, etc.

I suspect servolink is the company supplying those other guys. Servolink supposedly has the patent on that "snap-link" 0.1227 chain.

Evan
06-19-2010, 07:57 AM
There is another simple way to do it. You can use bead chain, the same as is used to make pull cords for overhead lamps and to restrain sink plugs. Making a sprocket is easy. Just determine the pitch of the beads and drill slightly larger holes around the circumference of an appropriately sized disk. Then turn a groove that connects the holes to allow the chain to lay into the holes.

You can also do the same for several types of jewelery chains although the holes need to match the chain links. Easy to do with CNC and a really small cutter. :D

allthumbs9
06-19-2010, 09:21 AM
What happens when the link tries to pass over/thru the sprocket?
There is another simple way to do it. You can use bead chain, the same as is used to make pull cords for overhead lamps and to restrain sink plugs. Making a sprocket is easy. Just determine the pitch of the beads and drill slightly larger holes around the circumference of an appropriately sized disk. Then turn a groove that connects the holes to allow the chain to lay into the holes.

You can also do the same for several types of jewelery chains although the holes need to match the chain links. Easy to do with CNC and a really small cutter. :D

winchman
06-19-2010, 09:38 AM
Maybe you have to pick a ratio, make the sprockets, and have the chain just the right length so the link will always hit the sprockets at the same locations. Then make a recess in each sprocket that has room for the link. You'll probably end up with more than one recess on each sprocket. Sounds like an interesting math puzzle.

Actually, they make 'double bead connectors' for making endless chain loops without special tools. See page 4 of the pdf here:

http://www.raymortool.com/SprocketPages/Sprocket%20Catalog.htm