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Registered Member #1792
Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
I have a piece of equipment which has the belt pictured below which goes onto a toothed sprocket. The tooth pitch is 0.1" and the total belt width is about 3/16". It is similar to a timing belt but the belt does not stretch, I think it has thin wire reinforcing it around the circumference.
The replacement from from the manufacturer is pricey, and they are responding to inquiries slowly. Does anybody recognize this type of belt and have a name for it, or even better a source? I'm also considering replacing the sprockets and belt with a more standard timing belt just to get it done faster and cheaper, though less optimally.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Looks a lot like a Posi-Drive -- often hard to classify in a catalog. Chain or timing belt? From pre-Internet days (were you alive then?) I had paper catalogs from Stock Drive Products and from Small Parts Inc (once smallparts.com, never smallpartsinc.com; now part of Amazon?)
Some versions or pitches might be obsolete, and your instrument maker is dealing from an end-of-life purchase.
See if these leads help. Do you know the difference between diametral and circumferential pitch?
or scroll from p. 195 of this slow-to-load document:
[edit] Also looks like the "no-slip" series from PIC; their 32DP series is 0.0982" CP. See page 5-8 in this catalog:
There are field-splicing kits to make up belts with an arbitrary number of drive pins. good luck.
Registered Member #1792
Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
I do believe you've hit the nail on the head with Posidrive! It's either the same or close enough that it should work. Now it's just a question of whether I can find the same type.
wrote ... Do you know the difference between diametral and circumferential pitch?
I didn't, so I googled it. Circumferential should just be the pitch when the belt is straightened, and diametral pitch is the number of teeth divided by the diameter of the gear. So CP=pi/DP? It tripped me up for a bit since DP has units of inverse length.
The 2.5mm pitch belts from SDPSI are probably the right size but they only come in single core. The English pitches only go down to .1475".
The 32DP from PIC looks correct. The belt it's replacing had 109 links, which needs to be pretty accurate as there is no room for a tensioner. I'll look into getting the belt and splicing kit from them.
Thanks for pointing me towards the right products!
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Does anybody recognize this type of belt?
