Touching off a diamond shaped insert tool on Z axis on lathe

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10 May 2022 03:32 #242458 by russjhammond
Thanks to this great forum, I have been able to get up and running with a Sherline Lathe and LinuxCNC. Just ran into a question I haven't been able to track down myself. When I am setting up a tool table and touching off different tools, so far, all of them have been straight forward. However, I just started using a diamond shaped insert tool and have it in position 6 (perpendicular to the stock). Touching off the X-axis is straightforward. However, what is the proper way to touch off the Z-axis. Do you eye ball the tip? Or do you touch off the left side diamond that is 90 degrees from the tip you will be using to do the cutting?

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10 May 2022 23:43 #242539 by andypugh
I don't know an easy way.
I do, in general, just eyeball it (with a loupe)

If you are using that tool then it is likely that absolute position relative to features cut with other tools is not all that critical anyway.

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11 May 2022 00:22 #242545 by spumco
If you're using a CAM program check what it expects.  Or if you're going to use a CAM program in the future, try to get a sense of what they normally do so it doesn't feel 'weird' later on touching off in a different way.

F360 generally uses the left side of the tool (or right if it's a back tool) and you have to measure & define the insert pretty closely if you want to hold size when cutting both with both sides (diamond tool, radius groover, button cutter, etc.).  Good luck if it's a hand-ground HSS job.

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