Colchester Student Roundnose Drive Pulley

This topic has 4 replies, 3 voices, and was last updated 21 April 2014 at 21:25 by JOHN BRIDGE 1.

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20 April 2014 at 22:35 #150334
JOHN BRIDGE 1
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@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.
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20 April 2014 at 22:35 #7120
JOHN BRIDGE 1
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@johnbridge1
21 April 2014 at 09:21 #150347
colin hawes
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@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
21 April 2014 at 12:19 #150365
Gordon W
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@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.
21 April 2014 at 21:25 #150397
JOHN BRIDGE 1
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@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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Colchester Student Roundnose Drive Pulley

Colchester Student Roundnose Drive Pulley

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