Poly-Vee Belts

PS you can get any number of ribs on the belt that you want - it apears the dealer just cuts the width you want off a wider belt of the standard length, although multiples of 4 are most common, Most common type for likely 'amateur' applications is the 'J section, 2.34mm rib pitch, I purchased a belt, £9.95 (seemed standard price for almost anything of similar style) with free delivery, from Bolton Engineering Products only today to play with - they have web and ebay sites (BoltonBearings).

No link with the supplier beyond eager anticipation!

For my application (700W motor, 25mm pulley, 5000RPM max) it appears a 4 rib belt is enough. Also good for for 1 kW with higher tension, but 1.4kW needs a 6 rib belt according to the Hutchinson application . My wood lathe, Axminster with 1.5kW motor, at lower speed (higher torque) and higher pulley diameter, (better belt wrapping/grip) uses a 10 rib belt.

NB quoted 'belt width is often that of the pulley top including flat edge areas, not the belt itself, so the 4-rib part you might find having a quoted width of 13.5mm, not the expected 9.36mm. Pulleys found on the web are generally expensive taper-bore fittings, not what I want. So probably buying some 100mm diameter 6082 soon for a bit of machining!

Martin

That is definitely good to know and info about the belt sizing that followed. Thanks Martin

Edited By Dibnah on 18/07/2020 08:36:54

You didn't say the length of belt you ordered for that price but this company might be worth bookmarking.

This size will suit me I think once I have moved things around a bit and it's only £2.78 delivered !

**LINK**

Slit many thousands of them.

Poly-V belts are easy to stitch, you just lay the wire in the groove and it keeps quiet as it doesn't touch the pulley. Not sure what wire is recommended though.

This is considered an "upgrade" in some quarters as it is quieter than a traditional stitched leather belt.

Can we please have a link with picture?

Have never seen it but it sounds OK.

Sorry - I have just gone through a load of Youtube, using the history function, and I can't find the image in my head.

I remember that the wire goes straight in the V and offsets to the next V on the outside, so its quite distinctive.

Poor answer but there is some info here:

https://www.practicalmachinist.com/vb/south-bend-lathes/serpentine-belt-conversion-alternative-w-clipper-lacing-239830/?highlight=poly

https://www.practicalmachinist.com/vb/south-bend-lathes/heavy-10-serpentine-belt-128822/?highlight=poly

https://www.practicalmachinist.com/vb/search.php?searchid=23838313