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Round belt and flat belt ecological niche and where to get them?

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PekkaNF:
I need two different belt drives.

One about 200w and 4000 rpm OD grider, motor and stone pretty close the same speed.

The other for ID grinding and pretty sure I need max I can get (min. pulley diameter)

I never used before round belts, but there are a lot examples on YouTube and books that indicate it is doable.

I failed to find a (metric) calculator that heps me to guestimate will it work or not? Is there any good rule of thumb e.g. 5 mm diameter modern urethane beltting?

Is there any magical number, after round belt is great vs. V-belt or is not viable any more?

Where to buy the belt and are there some standard endless rings or do I need weld my own?

Another choice would be a flat belt, but I have completely failed to find any source that would cater private customers for 1-3 belts.

Reason I'm asking that I had some FD-Z (5 mm wide V-belt, ribbed) and I tough I could use it on this one too, but can't locate any new anymore. Maybe small V-belts are as obsolote I am?

Than you.

Pekka

Arnak:
Hi,

The first thing is that the belt required is the type of pulley that you are using.

Flat, A section, B section etc?

Then use a belt calculator to find the length you need:-

http://www.durabelt.com/beltlengthcalculator.php

This page has the angles for the groove and the width of the belt so you can see which type you require :-

http://www.globalspec.com/SpecSearch/SearchForm/motion_controls/power_transmission_mechanical/v_belt_pulleys

A flat belt uses a rounded top pulley so you would know if you need that type.

Belts are available in all sizes and types, just try a google search when you know what you require.

Martin

PekkaNF:
Thanks, but this is for DIY spindle and pulleys I can make if I got the right belt.

Normal V-belts I can locate are way too wide (like 9 mm or more SPZ is 10 mm etc). Those would rob best part of the torque available. On these rpms even 5 mm wide would do nicely.

I would very much like to try flat belts, I know they need a crown on wheel and I have some equipment with about 2" wide flat belt, but I can't locate small continuous flatbelt.

I also don't have any real experience on round belt. I can find some figures on how high velocity can be and a lot of anecdotal indication that 5 mm might be the ticket.

I used this to guestimate:
http://www.durabelt.com/crosssectioncalcinfo.php

However, I would like to use miniature flat belt, because I need to learn that eventually anyway. I can't use cogged belt on ID grinding spindle, due to vibration and I don't like whining a toothbelt would do on that rpm. Unless I have no other choise.

This thread was interesting, he wants even a hihgher speed, but got basically the same problem:
http://www.cnczone.com/forums/linear-and-rotary-motion/77656-high-speed-belts.html

Pekka

chipenter:
Check out polly v belts I used one on my toolpost grinder , bought a 6 row j size and split it down the middle , the pullys are not hard to make and the smallest pully is 20mm dia .

velocette:
Hi PekkaNF
Have you considered using "Poly Vee" belts using  possibly 3 ribs with your 400 watts power at 4000 RPM
Pulleys are easy to fabricate in cast iron or aluminum.
Large differences  in diameters of pulleys are possible compared to Vee Belts 

Eric

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