Tangential Toolholder for round toolbits

[Friendly non murdering Sword]

Tangential Toolholders with square and round toolbits for the lathe have been on my list for quite some time know. I started out with the easier one for round toolbits. Everything was made out of stuff I already had around... An old toolholder and broken carbide endmills, out of which the toolbits will be ground.

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I decided to go with 6mm endmills. Tangential toolholders for square toolbits are tilted in two planes to clear the edges. For this round one I only tilted it 12° in one plane, away from the work. I figured in my head I should be able to achive the tilt of the other plane by rotating the bit in the toolholder - I hope I'll be correct on that.

So I tilted the toolholder 12° in the vise, spotmilled, drilled and reamed for 6mm.

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Next reliefed the bore for the clamping to work and all the clearance angles around the toolbit.

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The last things were to drill, counterbore and thread for M6 aswell as slitting the holder.

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By the way I now have the proper Machine to do the grinding

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So there it is. I'll hand in some images of surface finish after turning later, once I've put this to use and figured the right cutting parameters out.

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[Martin W]

Nice job!
Martin

 

[homebrewed]

I've been thinking about something similar so I'm interested in how the tool works for you. I have some HSS rod I bought for the purpose.

Instead of rotating the cutter to get the equivalent of a compound angle I'm wondering if rotating the holder toward the headstock would accomplish the same thing. Here's a study I did using OpenSCAD with that in mind:


In this study I was looking at a square cutting bit, but it would be easy enough to replace it with a round one.

 

[brino]

By the way I now have the proper Machine to do the grinding

Yes, you certainly do!
Congratulations.
I would love to have one in my shop.

Brian

Edit: ....and yes please do keep us updated with how this works out for you. Thanks!