Groove for round belt pulleys

[John ReeseParticipant @johnreese12848]

The smaller the included angle of the groove the greater the belt traction. There is a trade off. With increased traction comes increased wear. If I were making the pulley I would probably use 34 deg. included.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Jeff Dayman on 20/01/2016 14:11:48:

Ah, polystyrene most certainly CAN be remelted, as can all thermoplastics. Thermosets are the ones that can not be remelted, such as phenolics ( Tufnol is one brand) and epoxy. JD

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For my pennance, Jeff … I've found this useful list.

I'm not sure where I got he idea, but; although I knew that Polystyrene was a thermoplastic, I thought here was some problem with remelting previously moulded material [something to do with it decomposing before it melts].

I was evidently wrong; so thanks again for putting me right.

MichaelG.

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