27 Nov
2008
27 Nov
'08
3:19 p.m.
On 27 Nov 2008 at 22:20, Gordon JC Pearce MM3YEQ wrote:
Only one of the pulleys should be crowned. If
they're both flat, or
both crowned, it will throw the belt. No, I don't know why.
Just checked a Siemens FDD-200 here--only the motor pulley is
crowned. I maintain that the speed is determined by the maximum
diameter. The purpose of crowning a drive pulley is to keep the belt
from wandering off the pulley; the lower parts of the
crown actually
play little part in furnishing drive.
See, for example:
http://www.lhup.edu/~dsimanek/scenario/crowning.htm
Cheers,
Chuck