1 Jun
2013
1 Jun
'13
12:57 p.m.
Because the drive pulley is crowned I can't use
their string method, but
I'll be able to get calipers on the pulleys and work out the belt length
using their diameters and distance between them.
Reminds me of soemthing I wrote i nthe HPCC magazine when I described how
to repair the HP9810/HP9820 internal card reader. The belt on that is a
simpe O-rign running on grooved pulleys
Toe find the size of the O-ring, I said that a practical person would run
a bit of string round the pulleys, mark it and measure it. A calculator
hacker would measure the diameter of the pulleys and the spacing between
the spinles and use the belt length program in the HP67 or HP41
Mechancial Engnieering Pac. As I then went on to say, I am both, so I
did both. Fortuantely the answeres agreed to within the accuracy of the
measurements. Even more fortuately that size of O-ring works in the reader.
-tony