On Tue, Feb 14, 2023 at 05:18 PM, mike allen wrote:
??? ??? So , I've been thinking of making a ER40 collet chuck as you folks know form the tread I started last week . I keep thinking the only part that I'm not 100 %
sure I can pull off is the metric threads on the collet nut . So Erik's post got me thinking , why does the chuck need to be threaded for metric threads ? Why cant we make our own nuts & thread them SAE fine ? Does the nut need to be hardened ??
??? ??? Another thought I have been thinking about is how bout a collet chuck that doubles as a collet block ?
??? ??? Thought's ?
??? ??? thanks
??? ??? animal
?
There is info on here about cutting metric threads on a SB9. You need to swap a few gears, to drive the lead screw at a different rate. The one thing you can not use is the thread dial. Once you engage the half nuts, you must leave them engaged until you are finished cutting the thread. You make a pass, and shut the power off just as you are finishing the last thread. After the spindle stops, you back out the cutter, run the lathe in reverse to get back to the beginning and then crank back into the cut. It is a little slower than using the threading dial, but not bad.
