|NCMau said: (quoted from post at 12:57:08 01/28/13) Yes I understand it was belt driven. What intrigues me is the small |
side pulley for the up and down travel. I am guessing that would be
a production function allowing to make an automated travel. If it is, is not really making sense to me.
That looks to be a drive for the "table" feed powered off the main spindle. The line belt drives the main spindle which in turn drives the table feed. That gives you a power feed on the "table" which feeds the work up into the rotating cutting tool automagically. My guess is if you look you will find some sort of clutch that disengages the secondary drive to allow you to feed the work piece manually. Same principle is still used on a modern milling machine table although it uses gears not belts to power the table feed. Hard to tell from the pictures but it looks like it's a pair of multi-sheave pulley's so that you can adjust the drive ratio to vary the amount of feed/revolution same as you do using the gearbox on a modern machine.
TOH This post was edited by TheOldHokie at 10:06:05 01/28/13 4 times.