Colchester Student Roundnose Drive Pulley

[JOHN BRIDGE 1Participant @johnbridge1]

I am having a problem with the Flat Belt on this Lathe ( 80 inches long 1 1/2 inches wide ). It is running to the outside edge of the gearbox input pulley and some of the belt is then coming off the motor drive pully by about 1/2 inch. I have checked and double checked the alignment of the two pulleys and they seem to be correct. The input pulley is not flat across it's width more like an inverted V shape with the apex more towards the gearbox side of the pulley, should this pulley be flat across it's width, the pulley is 2 inches wide.

[JOHN BRIDGE 1Participant @johnbridge1]

[colin hawesParticipant @colinhawes85982]

A flat belt pulley should be slightly crowned so that it is a larger diameter in the centre: this makes the belt tend to stay on the right place on it's pulley. If the belt has a joining device it needs to be fitted squarely so that the belt's circumference is the same on both edges. Colin

[Gordon WParticipant @gordonw]

Can re-crown by turning very shallow taper on both sides, with apex in center, then file at the apex. Done hundreds of large pullies like that.

[JOHN BRIDGE 1Participant @johnbridge1]

Thanks very much for your replies, I have it sorted now, the belt I was using was in very bad condition, I have a new belt on now and all is ok.

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