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Tool Using 1/4" lathe cutting tools in a holder made for 1/2" tooling

Tool

Larry_C9

Super User
Premium Member
I was recently machining some very small parts in the lathe and decided I could only access it with 1/4" cutting tools. I want to have a good rigid mount for the 1/4 cutting tool so I squared up a piece of mild steel stock I had to fit the full length of the 1/2' slot in the AXA tool holder. I then milled a slot in the top of new adapter to fit the 1/4 cutting tools . I centered the 1/4 slot under the center of the tool holder set screws. A couple of things I ran into - The so called 1/4 HSS cutting tools I bought from Accusize only measured .144" square so cut the slot to fit them fairly close leaving the 1/4 tool sit about .015" high so the set screws would get a good hold down on the tools and adapter. 2nd - the 1/2 square adapter did not fit right back against the back of the slot in the AXA holder because there was a slight radius in the inside bottom corner. A little chamfer on the inside bottom corner of my adapter solved that problem.
 

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    Tool Holder end.jpg
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  • Half to quarter adapter.jpg
    Half to quarter adapter.jpg
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Susquatch

Ultra Member
Administrator
Moderator
Premium Member
I then milled a slot in the top of new adapter to fit the 1/4 cutting tools . I centered the 1/4 slot under the center of the tool holder set screws.

I have had to do something similar a few times. I put a thick shim behind the tool and another under it. Works the same as what you did without the machining.

I think your approach will be much more rigid. The main reason I did it differently is that I didn't have a decent mill yet.

When I get out to the shop I'll take a photo and add it here.
 
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