MetalworkingFun Forum

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Greg, thanks for the pic, boy! they ARE worth a thousand words.
I knew it couldn't be a simple cotter pin so I Googled split cotter and that's where I got the pic of the cotter pin and, actually, they are split.
I went back to Google this morning and found a website just a bit down from the one I got the cotter pin pic from and low and behold Slaphead

, there it was.
It's something I would have described as "a clamp like the spindle lock on some drill presses or tailstock rams" which is rather clumsy compared to "split cotter" Rotfl

Now I can take it easy for the rest of the day, having learned something already.

Great, cleared that up for everyone, but no ones told me how I managed to turn a crooked thread on a lathe.

You had one eye closed. Thumbsup

"Billy G"

(11-15-2012, 07:51 PM)f350ca Wrote: [ -> ]Interesting screw up today.

I appreciate the phrase in connection with this problem.

(11-15-2012, 07:51 PM)f350ca Wrote: [ -> ]then single pointed a 7/8 14 tpi thread on the end. Cleaned it up with a solid die, then parted it off. The thread is crooked to the pin.

I've had that problem occur before and, I'm not sure whether the dietilts as ithe first point engages or what.
I hate power threading with a die unless it's securely held in a tailstock holder. I've now taken to continue the single point cutting til a sample female thread (i.e. nut) will thread on nicely.
Maybe it's because of broken or dull teeth on one (or more) of the 3 (or 4 or whatever) sets of teeth on the die.
I'm sure your counterbore solution will shoulder up with no problens

I wasn't using the die under power, must have tilted as you say, worked fine for the mandrel in the very first picture.

A little more progress.
Have all the swivels finished except for the locking handles, using allen bolts and a knurled knob I found, may make more of them, has plenty of purchase to lock the movement.

[Image: IMG_0341.jpg]