Lathe Cross Slide Problem

[PixMan]

Looking good there Ed!

I take it you did not have a small end mill long enough to get into that elongated counterbore and mill the shank size hole longer. I should be easy enough to get from the other side.

How does the center heights of the nut and screw line up in a dry test fit? Will you need to shim it up or skim some off the mounting surface of the nut?

[EdK]

Ken,

That's right. I don't have an end mill long enough in that size.

I haven't tried testing for center height yet. I'm hoping to get to that tomorrow.

Ed

[EdK]

Despite my best efforts at getting this done this weekend, it just didn't happen. I'm close though. I just need to take off .021" from the mounting surfaces of the nut and then mark, drill and tap for the mounting screws. Reassemble and hope I took my measurements correctly.

Ed

[PixMan]

Ed,

If you hadn't thought to do this, I think the best thing to do for milling the mounting surface flat and parallel with the screw thread axis would be to thread it onto the screw, then set the assembly in your milling vise with parallels supporting the screw as you clamp it.

[EdK]

Ken,

I did something similar when I got the nut since the bottom was not flat due to the stresses being relieved from the slitting operation. I just skimmed it enough to make it flat. Now I'll skim it to size.
I threaded the nut onto the lead screw and then put the lead screw onto a matched set of V-blocks so the nut was suspended above the vise base. Then I clamped it into the vise. The sketch below shows it better than I can describe it. The top sketch is looking at the side view and the bottom at the top view.

Ed

   

[PixMan]

Perfect way to do it! And yes, I did notice it went a little out-of-flat there after slitting it. Good of you to get it right, hope it fits when done.

[EdK]

(06-23-2014, 06:06 PM)PixMan Wrote: Perfect way to do it! And yes, I did notice it went a little out-of-flat there after slitting it. Good of you to get it right, hope it fits when done.

Oh good!

I held off doing anything tonight just in case I was way off base in the way I did it the first time. While setting up the mill with the vise and end mill in preparation, I cut my finger on the end mill and decided I better put it off until tomorrow evening. It took the wind out of my sails (it doesn't take much these days).

Ed

[stevec]

(06-23-2014, 06:19 PM)EdK Wrote: [It took the wind out of my sails (it doesn't take much these days).
Ed

I hear ya Ed, besides, blood isn't a very good cutting fluid.

[EdK]

(06-24-2014, 07:16 AM)stevec Wrote: ...

... blood isn't a very good cutting fluid.

Good one.

[DaveH]

Clumsy ...................
Looking for sympathy

DaveH