Modifying a Southbend Headstock for Indexing

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Bernd:
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

Darren:

--- Quote from: Bernd on February 27, 2009, 01:51:49 PM ---
Next I set up the thread cutting tool using the thread gage.

Bernd

--- End quote ---

So that's how you square up the tool !!!!

Thanks Bernd :thumbup:

Looks good btw, even though I can't follow where this is going just yet, keep em coming :clap:

Divided he ad:
Nice work Bernd :thumbup:

I still have to find the time to have a go at this threading stuff!

I have to ask this though.... Where did the dowel looking bit go? The one lined up above the pin, next to the nut and flat washer.... I can't remember seeing it's home?

Looking forward to the rest :)

Ralph.

sbwhart:
Nice bit of thread turning there Bernd :clap:

Look forward to next posting. :thumbup:

Cheers :wave:

Stew

Bernd:

--- Quote from: Divided he ad on February 27, 2009, 03:22:50 PM ---Nice work Bernd :thumbup:

--- End quote ---

Thanks Ralph

--- Quote ---
I still have to find the time to have a go at this threading stuff!

--- End quote ---

Practice with a larger thread such as the 1/2"-13. Much easier to do than a smaller thread if you've never tried it.

--- Quote ---I have to ask this though.... Where did the dowel looking bit go? The one lined up above the pin, next to the nut and flat washer.... I can't remember seeing it's home?

Looking forward to the rest :)

Ralph.

--- End quote ---

I didn't need to use it. I thought that the washer might not work alone, and that I would need something samller under the washer. But the washer by itself worked fine so I didn't need the drill bushing.

The rest of you guys, thanks for the nice comments. More to come as soon as I do a bit of woodworking in the kitchen (those cabinets you know). :)

Bernd

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