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small toothed belts


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brian jones 1118/08/2021 21:44:41
347 forum posts
62 photos

Does anyone know of a source of short toothed (cogged) belts suitable for a lead screw drive.

I thought this would be a simple Ebay search but spent an hour to no good result

Maybe I am using the wrong keywords?

Any ideas pls


Howard Lewis18/08/2021 21:51:20
5348 forum posts
13 photos

Suppliers of "pulleys" for cogged belts, such Davall Gears, Reliance Gears, HPC Gears etc?


Manofkent18/08/2021 21:58:28
139 forum posts
29 photos

If it is a cnc belt have a look at cnc4you webpages. There is a lot of info, they sell belts and pulleys.


V8Eng18/08/2021 21:59:52
1634 forum posts
32 photos are worth checking out for those.

Emgee18/08/2021 22:20:53
2161 forum posts
265 photos

+1 for Simply Bearings


Paul Lousick19/08/2021 00:03:01
1862 forum posts
661 photos

Try searching for timing belts.

I just did a search on ebay for 16mm (and 20mm) timing belts and found dozens of examples of belts and pulleys.


DC31k19/08/2021 06:20:36
578 forum posts
1 photos

It is not clear from your post whether you want belts that run on smooth pulleys (known as asynchronous) or belts that run on toothed pulleys (known as synchronous).

A good place to start to survey the market is manufacturer's websites: Gates (not Gareth or Bill), Fenner (not Dave or Keith), Mitsuboshi (sic, not the car maker).

Paul Lousick19/08/2021 07:36:28
1862 forum posts
661 photos

The question was for a " toothed (cogged) belt suitable for a lead screw drive". I would assume (I know, should never do that) that it is not for a smooth pulley. All of the electronic lead screw projects that I have seen use a timing belt, especially if used with a stepper motor for CNC.

not done it yet19/08/2021 08:13:24
6350 forum posts
20 photos

There is one on my Bosch PHO 2-82 planer. I’ve only needed to change it once in about 30 years of ownership.

Mike Poole19/08/2021 09:53:20
3075 forum posts
72 photos

I often use Bearing Boys for belts of all sorts, what you are looking for are timing belts which they list under transmissions. I wanted a smaller belt than the range they supply for the encoder drive but I got the belt and pulleys from them for the stepper drive. I have no connection other than a satisfied customer with the company. Service has been prompt and although I have not chased the absolute lowest price for items I have found their prices very acceptable.


brian jones 1119/08/2021 10:05:38
347 forum posts
62 photos
Posted by Manofkent on 18/08/2021 21:58:28:

If it is a cnc belt have a look at cnc4you webpages. There is a lot of info, they sell belts and pulleys.


thats more like it, they sell the SS belt and the sprocket (small 1" dia)

presumably one would need to make a larger driven wheel say 75mm dia oneself

hmm another chalenge

would one calculate the pcd and drill a set of teeth with a 5mm drill (or less probably) in an ally blank

probably be noisy

I will have to check torque requirements

Bed speed I think a max of 3" per min down to say 0.3/min (must recheck) so 10 tpi gives 30 rpm max on the lead screw.

JasonB19/08/2021 10:14:32
21467 forum posts
2455 photos
1 articles

Why would you need to make the 75mm pulley when they are available, something like this for XL size belts or this for T5 size belts and just modify to suit though you could make if you wanted to but you don't seem too keen to do that.

Not sure where you get your max an min bed speeds from but the minimum on mine is more like 3" and the max something like 12-15" ideal for rapid return and my spindle speeds are not any higher than yours. Simple way to work out what you need is to mount up a cutter and a bit of metal and mill it, make a note of how many times you turn the handwheel in 60secs to get rpm, Unlikely you take 20seconds to do one revolution unless you have something seriously wrong with your chip loading.

Edited By JasonB on 19/08/2021 10:18:36

John P19/08/2021 10:23:37
339 forum posts
230 photos

If you are able to find a copy of MEW 164 there is an article in there "form
relieved toothed belt cutters " June 2010 for making cutters for
1/5 " XL ,3/8" L and 5 mm HTD pulleys and the calculations
for the pulley sizes.


John Haine19/08/2021 10:25:05
4188 forum posts
242 photos

RS and Farnell/CPC

brian jones 1119/08/2021 10:40:18
347 forum posts
62 photos

Thnx JB as you can see I was looking in the wrong place with the wrong keywords - its in the aesthetic world of CNC and timing belts etc. but prices I saw for large driven cogs were silly money for a hobbyist £50

Industrial suppliers will also have unaffordable prices.

so a new door has opened for me and I have acquired an electric window assy for a tenner - well its a start and I agree that going to stepper motors really is overkill for this duty.

Trevor Drabble19/08/2021 12:48:31
261 forum posts
5 photos

SHG Marine supply many items for model boats , including XL belts and pulleys , all at reasonable prices . No connection with company other than as a satisfied customer .

Nick Hughes19/08/2021 15:33:49
255 forum posts
142 photos

Another supplier that I've used quite a few times is Belting Online

Always had good service from them.

John Hinkley19/08/2021 16:21:28
1188 forum posts
392 photos

I've just stumbled upon this thread and, like Nick Hughes, I been using Belting Online for all my belt and pulley purchases. Their prices are what I consider very reasonable and delivery is as quick as 2nd class postie takes. I'm using a 60 tooth XL pulley on the leadscrew driven by a 20 tooth on the servo motor. The spindle encoder doesn't take much in the way of torque, so I've settled for 26 tooth pulleys and HTD3 belting, 9mm wide.


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