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

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philf:

--- Quote from: chipenter on July 24, 2015, 05:59:30 PM ---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 .

--- End quote ---

I used round belts (not sure if they're 5 or 6mm dia. - I'll check) for my toolpost grinder but I only use a 90w motor.

I use Poly-V's on several machines and as chipenter says you can go down to a 20mm dia. pulley with a J-section belt. Belts are very easy to get particularly if you use one from e.g a lawnmower.

Groove dimensions and power graphs:





Phil.

velocette:
Hi PekkaNF
Whoops this got missed on previous posting a bit more info on "Poly Vee Belts"

SwarfnStuff:
Hi Pekka,
    If you do use the round belt I'm fairly sure the 5mm urethane one uses a small double barb joiner. At least what I used on my X2 mill belt conversion does. The joiner is like a super small barbed hose joiner and fits down the hollow centre of the belt. I started with the green welded one but kept breaking the weld even when I got the shop to join it for me as the small pulley was 20mm diameter.
  If I were to do it again I would opt for the poly vee and buy twice the width so it could be split and I would finish up with a spare and save postage. (Scrooge)

PekkaNF:
Thank you.

Sooo.... :D

Studio audience greatly agrees that I should have a look on Poly-V (multirib) belts and they will eat the lunch of round belt and flat belt any day.

Smallest I got from local auto store was 3PK 560, I'm twiating it in my hands and it feels like it would transmit few kW at 3000 rpm. I.E. pretty stiff. Therefore I'll be looking PJ section, judging from the graph you kindly provided PJ section looks pretty good bet. I have seen on home applience small polyVs on incredibly small pulleys, just turned at the end of the motor shaft and then flat cylinder, pretty much like flat belt pulley sans crown.

So, it looks like that pulley section is not overly critical. I read some Stevenson's writing on using thread chaser of nonstandard angle and still working. I can grind HSS to that accuracy on single point tool. PDF even had rounding and some toleraces.

Still somewhat interested on round belt. I just got a small DC motor 70V DC 1,8A 30Ncm 110W 4500 1/min that might be better suited to round belt.

Pekka

Swarfing:
I used a chaser on JS's recommendation to make some pulleys for one of my mills a good while ago. This worked a treat for my 5 rib belt, make sure you use coolant though as the ali will gum up quickly on those small threads. Don't quote me but i think I used an 11/16th thread cutter which worked out for the metric belt used. The belt will just bed to the cut grooves anyway.

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