Demystifying the B&S No. 6 Plain Screw Machine.

Read most of the specs from the doc on the VintageMachinery.org site last night.  That and watching a few vids has me thinking about old #6 again.

Everything I say here is based on the one specs document.

"DRIVE Cone, 3 steps, largest 11" diameter. 3" belt. Friction back gears. 12 changes of spindle speed forward, 30 to 450 revolutions per minute; 6 backward, 63 to 450 revolutions per minute. Speeds in geometrical progression. 4 forward speeds always instantly available, without shifting belt."

Looks like there is a V belt adaptor screwed to the spindle.  Will look further into that later.

This may have been the selector for the 4 shiftable speeds.   It looks like there are screws in the holes so maybe not.  

At the rear of the machine there is a large gear.

Large gear as viewed through cover on rear of headstock.

xxx

Near the front of the spindle is this pinion gear.   It, the shaft and the large gear turn together.  The bevel gear behind this gear does not turn.