Making Simple QC Tool Holders

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vtsteam:
Funny you should say that b85V, I thought the rake seemed pretty extreme, too. But I've never owned a tangential tool holder before. I spent the day playing with it, and I'll get photos on later tonight.

It does facing cuts because it has a 12 degree angle both ways.

The source for my version geometry was here:

http://www.gadgetbuilder.com/ToolHolders.html#Tangent

But I'm beginning to think there was a mistake in the design of the sharpening jig. I believe it is giving a rake of 30 degrees from vertical instead of horizontal -- and I'm guessing that 30 deg from H was meant.

Suppertime -- back with more later.....

vtsteam:
Okay, first photo, trying out a cut on some rusty hot rolled steel -- not particularly good stuff, hard to get good finish generally, but this tool bit is doing a pretty good job.

vtsteam:
Here's what the finish looks like close up.

vtsteam:
I found it would remove up to about 30 thou deep in one cut turning. Anything more broke the point of the tool. Which is a real pain because you have to grind a lot of material at this acute angle to get back to a point. Plus the tip tends to burn really easily. I now think it was too acute, in agreement with black85vette.

Facing provided a similar finish and limitation of depth of cut. It definitely wasn't a suitable tool for hogging metal off. The tool tended to jump under the cut if I tried to cut too deep as it approached the center. That would also break the itp.

vtsteam:
Oh, thanks awemawson, I'll have to read up on nitriding. Is that just a commercial process, or is that something that we can do in our shops?

Thanks AndyF, I hope I can work on the last one tomorrow. :dremel:

SwarfNStuff thanks greatly! :beer:

Here's a picture of the jig I used to sharpen the tool bit. It was taken from the site referenced earlier, and the pdf drawing it referenced though I didn't pay attention to the actual dimensions other than the 30 degree angle from horizontal.

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