Lathe Cross Slide Problem

[EdK]

(04-23-2014, 09:14 PM)PixMan Wrote: Looks great Ed. I'd want a little more info on the fit of the feed gear to the screw. Is it a slip fit or RFT? (Really F'n Tight)

Can you measure the 12mm diameter with a really good micrometer that reads out in "tenths" or microns?

We need to design the nut, as I would make that FIRST (because it's tapped) and then make the screw fit into it snug.

Ken,

The feed gear is a slip fit onto the lead screw. It's pinned on using a 4M x 20mm roll pin. The only critical length dimensions of the whole lead screw are the ones starting at the shoulder to the left of the hole for the spring pin and going right to the end of the lead screw. That total distance sets the location of the feed gear. I actually added an inch to the length of the acme threads because I wanted the cross slide to be able to move further towards the rear of the lathe. There were a number of times I could have used the extra travel distance.

I used the Mitutoyo digital micrometer to measure the diameters but I didn't note them to the "tenths" so I'll remeasure them again and update the drawing.

I'm hoping to get to machining the underside of the cross slide for the nut this evening. You suggested using two screws to mount the nut but I'm wondering about the location of the screws. Do they get put down the center-line of the nut or one on each side?

Thanks Ken!

Ed