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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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DIY CNC - errors in lead screw thread.
I've just test run a little CNC router / mill I've put together.
At the moment I'm using M10 x 1.5mm pitch allthread for the lead screws and PVC blocks for the nuts. I've calibrated the axes (Mach3) using the 1.5mm leadscrew pitch and the known motor steps/rev. With a dial gauge on an axis, when I do a 1mm move sometimes I see 0.90mm or 0.95, sometimes 1.0. It seems repeatable, ie if I reverse the steps I see the same values. What do people think? I guess this is typical for cheap bit of allthread from the local hardware store? ACME leadscrews are on the drawing board when finances are willing.... |
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