So I have a cunning plan. I have the old version of the cheap shit Ozito router, mine is about 15 years old now, but the design hasn’t changed.
the depth gauge has 3 threaded posts at the bottom so you can quickly switch heights for multiple passes. They can be removed with a screwdriver and shifter. I 2 plans
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Remove one of the posts and replacing it with a long piece of all thread. Over this and through the depth gauge hole insert a sleave (pipe) over the thread connected to the bolt on one end and the Z axis coupler at the other.
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remove the post mount entirely and replace it with a lead screw of the appropriate size with bearings connected to the Z-axis motor. using something like this https://www.gearbest.com/3d-printer-parts/pp_436456.html That one is the wrong size.
Risks - The compression is only on one size so it will either jam, or the springs may be too strong. in the latter case I can remove 1 or both of the springs
Benefits - simple to construct and cheap as hell if I bust my router to replace it. Also give me full depth control over the entire travel range
Thoughts anyone?