Timing Pulley

lvmymp5 · Post by **lvmymp5** » Tue Dec 05, 2023 2:41 am

I have a timing pulley that has 16 teeth with .625" shaft diameter and I want to upgrade the servo motors. All the Clearpath servo motors that I looked at have a .500" shaft diameter. The closest timing pulley that I have found that's has .500" shaft diameter has 18 teeth. Will this timing pulley work for the job. I has the same pitch and belt width except for the number of teeth. Thanks

suntravel · Post by **suntravel** » Tue Dec 05, 2023 3:25 am

It will change the reduction rate, or you have to change the other pulley also.

Uwe

tblough · Post by **tblough** » Tue Dec 05, 2023 8:21 am

You could look at Fenner tran-torque bushings. You could use your current pulley by boring it out to fit the bushing.

If you go with a different tooth count pulley you'll change the gear ratio as Uwe states, and it will also require a different belt length.

Nigelo · Post by **Nigelo** » Tue Dec 05, 2023 9:51 am

For such a small diameter Timing pulley you might struggle to find a suitable locking bush with small enough OD that you could fit to your bored out, original 18T without excessive weakening, if at all.

Not sure where you are located but on this side of the pond, 18T pulleys are sold with pilot holes only. That is simply bored out / drilled to your required diameter. I'm in the UK and use Huco - Their 18T example (XL Tooth profile and 1/4" belt width) as follows:

https://www.huco.com/shop/power-transmi ... s/18011800

Edited to add link to 16T version of above (I mistakenly referred to 18T instead of your 16T original)

https://www.huco.com/shop/power-transmi ... s/18011600

tblough · Post by **tblough** » Tue Dec 05, 2023 10:28 am

Tran-torque 1/2” id bushing requires a 7/8 bore. Keyless bushings are far superior to keyways and setscrews.

Nigelo · Post by **Nigelo** » Tue Dec 05, 2023 10:47 am

tblough wrote: ↑Tue Dec 05, 2023 10:28 am Tran-torque 1/2” id bushing requires a 7/8 bore. Keyless bushings are far superior to keyways and setscrews.

Precisely my point. The 16T center flange has a diameter of just 0.63" (16mm) so no can do unless another type can be found. Otherwise agree.

lvmymp5 · Post by **lvmymp5** » Tue Dec 05, 2023 11:59 am

Thanks for your quick reply and info. I believe I found the pulley i need from huco:

https://www.huco.com/shop/power-transmi ... s/17231600

I forgot to the location to my original post sorry about that (USA). Your help is greatly appreciated.

Nigelo · Post by **Nigelo** » Tue Dec 05, 2023 1:11 pm

No probs, pleased to help

ShawnM · Post by **ShawnM** » Tue Dec 05, 2023 9:38 pm

I get all my pulleys from B&B Manufacturing here in the US. They offer imperial and metric pulleys and will custom bore anything all at very reasonable prices. All pricing is available online and most pulleys are in stock. I don't know what pitch belt you have or belt width but they have 1/2" bore with 16 teeth.

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Timing Pulley

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