Ok, back to making the cotter key clamp. Now that the hole has been drilled I can make the cotter blank.
To start with I'm turning down a piece of .875" (22mm) dia. brass. I had to turn it down some so it would fit on the flat that was milled on the body of the clamp.
Next I turned the body of the cotter to .750" (19mm) dia. to fit the hole in the body of the clamp. Unfortunately the hole that I had drilled with my home made drill was a bit smaller than .750".
Next I turned the dia. for a 1/2"-13 thread and brought the ends down to minimum dia.
Next I set up the thread cutting tool using the thread gage.
Next I blackened up the thread dia. and took a scratch cut to check that the number of threads is 13 using a thread gage.
Yes, it is 13 not 15. They look very close.
The thread was cut and checked until a 1/2"-13 nut fit snuggly.
Here's the aluminum block the brass cotter and a selection of washers and the nut.
This is what it looks like assembled.
And we leave off with a look at what's next, mounting the clamp on the faceplate. It has the cotter in place to be bored out to the dia. of the spindle.
Next I'll show how I clamped the spindle clamp on the faceplate.
Now to get back and do some cabinet work before the wife finds out I'm goofing off.
Bernd