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v-belt and pulley sizes for small lathe

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Forum topic by whitechev posted 11-15-2016 05:44 PM 613 views 0 times favorited 6 replies Add to Favorites Watch
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whitechev

9 posts in 995 days


11-15-2016 05:44 PM

Hey. I bought the ‘headstock’ and ‘tailstock’ from a tiny lathe at a garage sale and have built a bit of a base for it. I am curious to play around with it a little. Anyway I am having trouble identifying which v-belt size goes with the pulley. It seems like the belt could be 3V but it is unclear- there are no markings and the pulley seems possible even smaller then 3V.

I made a little sketch to show the measurements below. Let me know what you think!

Also, the motor I would like to use has a 1/2” shaft. If the belt size is 3V will it be possible to find a 3V pulley with a 1/2” shaft? I did a quick search and didn’t come up with much.

Thanks!

Chris




6 replies so far

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MrUnix

5985 posts in 2033 days


#1 posted 11-15-2016 06:05 PM

Classic V belts for fractional horsepower applications such as those used on woodworking machines typically come in two sizes, 3L and 4L (A Series). 3L are 3/8” across the top and not very common, and 4L belts, which are by far the most common you will find, are 1/2” across the top. I suspect your measurements above for pulley width is outside to outside (5/16”), and the inner measurement will be more closely matched to a 4L belt, which you can find most anywhere that carries automotive belts (Ace hardware, tractor supply, auto parts stores, etc…).

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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whitechev

9 posts in 995 days


#2 posted 11-15-2016 06:14 PM

Hi Brad. Thank-you for your quick reply. The 5/16 measurement is actually inside to inside but either way you have me on the right path.

One more question- will I be able to find a 3L/4L pullet with a 1/2 shaft? Again, I searched for this but it is unclear.

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MrUnix

5985 posts in 2033 days


#3 posted 11-15-2016 06:25 PM

One more question- will I be able to find a 3L/4L pullet with a 1/2 shaft? Again, I searched for this but it is unclear.
- whitechev

All over the place… Graingers has 47 1/2” bore sheaves listed in various widths and O.D.’s. Other supply houses are similar, like McMaster Carr and MSCdirect... 1/2” bore is not at all uncommon. I’d try your local Ace hardware, Tractor supply, and maybe even Fastenall if you have one locally as well.

One other thought… how do you plan on doing multiple speeds? That sheave on there now is basically a single speed deal – which is unusual (particularly one for dual belts) and maybe not original. Usually, they will have a 3 or 4 step sheave on both the headstock and motor so you can switch ratios and vary the speed. Unless you are going to use a variable speed motor, you will need to figure out a way to mechanically change speeds.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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whitechev

9 posts in 995 days


#4 posted 11-15-2016 10:54 PM

Hey Brad. Thanks for this. I will be using a variable speed motor so I am not too concerned with using stepped sheaves. I agree though- very strange to have a dual belt non-stepped sheave. Not sure what purpose that would have served.

Looking into this a little more- I believe a 4L belt is the same size as an A-belt (1/2) top width which makes it too large for the sheave on the lathe itself. This is pretty much why I made this post in the first place- the auto parts stores, etc. around me only have A-belts and larger.

What I need, I believe, is a 3L or 3V wedge belt which has a 3/8 top width. This seems to pretty difficult to find locally. There are a couple big on-line retailers out of the States (I am in Canada) but the shipping is outrageous.

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MrUnix

5985 posts in 2033 days


#5 posted 11-15-2016 11:17 PM

Dang…. you are right – a 4L would be too thick. For some reason I was reading the measurements as being bigger (I hate fractions :) A 3L belt would be what you need (a 3V is deeper than 1/4”), and finding them locally might be a bit of a challenge. I guess that would dictate you getting a 3L for the motor as well. It might be easier to swap out the headstock with a 4L sheave.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Leo Van Der Loo

45 posts in 592 days


#6 posted 11-16-2016 01:52 AM

Chris I have dealt with “beltsforanything” and do recommend them highly, they are very helpful and shipping was the basic mailing cost, and then contact you to find out that the belt is what you needed, best service around.

http://www.beltsforanything.com/store

-- Have fun and take care

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