# Sprocket requirements and sources **URL:** \ **Category:** Hardware\ **Tags:** sprocket, calibration, motors\ **Created:** [August 19, 2018, 6:20pm UTC](https://forums.maslowcnc.com/t/sprocket-requirements-and-sources/5972 "2018-08-19T18:20:27Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![ManOfScience](https://avatars.discourse-cdn.com/v4/letter/m/47e85d/32.png) [@ManOfScience](https://forums.maslowcnc.com/u/ManOfScience)\ **Post date:** [August 19, 2018, 6:20pm UTC](https://forums.maslowcnc.com/t/sprocket-requirements-and-sources/5972/1 "2018-08-19T18:20:27Z")
I am self-assembling my “kit” of required components to join the Maslow world. I’ve been fretting over finding the correct drive & idler Sprockets when I just realized that maybe there is more tolerance that I think. For the Drive, I’ve been aiming for a #25, 1/4" pitch, 10-tooth, with Finished Bore of 8mm to match the Motor Shaft. But… \*\* I _suspect_ that the calibration process will accommodate variation in Drive Sprocket Diameter (& Tooth count) ; _Can anyone verify?_ \*\* If I _do_ go up to a 12T Drive, _will the motors still produce sufficient torque?_ \*\* If I do go up to a 12T Drive, _will the accuracy reduction be significant?_ \*\* I know that the Idler sprocket diameters are irrelevant, but have seen some that look like they are actually suspended _inside_ a top Unistrut ; _Is planning for this possibility realistic or a concern?_ \*\* _Is there a minimum tooth-count that is needed to guarantee smooth chain rolling without pickup?_ \*\* I’ve still not come across a datasheet for the motors; _Can anyone report the shaft dimensions on them?_ In Canada, it looks like Acklands-Grainger (who are normally **very** expensive) might actually be the cheapest/fastest source I’ve found… although they don’t have the #25 in a 10T ☹ ---
**Author:** ![aluminumwelder](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/aluminumwelder/32/9362_2.png) [@aluminumwelder](https://forums.maslowcnc.com/u/aluminumwelder)\ **Post date:** [August 19, 2018, 6:57pm UTC](https://forums.maslowcnc.com/t/sprocket-requirements-and-sources/5972/2 "2018-08-19T18:57:26Z")
10 teeth is standard $3 on eBay from China. You really don’t want bigger stickers that would drive it faster. Maslow works best slowly [https://m.ebay.com/sch/i.html?\_from=R40&\_nkw=10t+sprocket+8mm&\_sop=15](https://m.ebay.com/sch/i.html?_from=R40&_nkw=10t+sprocket+8mm&_sop=15) ---
**Author:** ![ManOfScience](https://avatars.discourse-cdn.com/v4/letter/m/47e85d/32.png) [@ManOfScience](https://forums.maslowcnc.com/u/ManOfScience)\ **Post date:** [August 19, 2018, 7:36pm UTC](https://forums.maslowcnc.com/t/sprocket-requirements-and-sources/5972/3 "2018-08-19T19:36:50Z")
Thanks @aluminumwelder . I appreciate the experienced info! I will stick with the 10T drive based on your warning (Good thing I didn’t go by memory - I was thinking 20T was standard!) … Still looking for another source cause the ebay example you listed takes up to 2 months to ship to me ☹ ---
**Author:** ![aluminumwelder](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/aluminumwelder/32/9362_2.png) [@aluminumwelder](https://forums.maslowcnc.com/u/aluminumwelder)\ **Post date:** [August 19, 2018, 7:50pm UTC](https://forums.maslowcnc.com/t/sprocket-requirements-and-sources/5972/4 "2018-08-19T19:50:05Z")
> **[McMaster-Carr](https://www.mcmaster.com/#2737t2/=1e8761m)** > > McMaster-Carr is the complete source for your plant with over 570,000 products. 98% of products ordered ship from stock and deliver same or next day. above link is for the usa supplier. $30 for two by the time you pay shipping most likely. the motor brackets, jst cables, motors, roller chain, electronics, almost the whole machine is made in china. might as well order it all at once on aliexpress and work on making the wood stand IMHO. not wroth paying 10x the price to get it a few weeks earlier. not sure how fast mail moves in china, but in usa, a lot of the chinese suppliers can get to me in 2 weeks. ---
**Author:** ![ManOfScience](https://avatars.discourse-cdn.com/v4/letter/m/47e85d/32.png) [@ManOfScience](https://forums.maslowcnc.com/u/ManOfScience)\ **Post date:** [August 19, 2018, 8:02pm UTC](https://forums.maslowcnc.com/t/sprocket-requirements-and-sources/5972/5 "2018-08-19T20:02:04Z")
Good point. I’m looking at it the same way. I’m currently trying to order everything I can think of so that it arrives in less than 3-weeks. Hopefully, I’ll have the frame and sled built by then and won’t be held up waiting for anything when the Motors & Such arrives… Although it currently looks like most of my stuff might arrive in under 2 weeks - so I better get building! Here’s hoping I can get the sprockets quickly too! (I’d pay way more than $30 to avoid having a finished Maslow sitting for 2 weeks waiting for a pair of drive sprockets!) ---
**Author:** ![aluminumwelder](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/aluminumwelder/32/9362_2.png) [@aluminumwelder](https://forums.maslowcnc.com/u/aluminumwelder)\ **Post date:** [August 19, 2018, 8:09pm UTC](https://forums.maslowcnc.com/t/sprocket-requirements-and-sources/5972/6 "2018-08-19T20:09:24Z")
understood, but you know murphy’s law right? the one widget you need , is the one you forgot to order. there are so many pieces to the maslow puzzle it will be easy for a beginner to miss one. so it will be come a game of hurry up and then wait. ---
**Author:** ![ManOfScience](https://avatars.discourse-cdn.com/v4/letter/m/47e85d/32.png) [@ManOfScience](https://forums.maslowcnc.com/u/ManOfScience)\ **Post date:** [August 19, 2018, 8:12pm UTC](https://forums.maslowcnc.com/t/sprocket-requirements-and-sources/5972/7 "2018-08-19T20:12:46Z")
> [@aluminumwelder](#): > > the one widget you need , is the one you forgot to order LOL - Right you are!