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General Mach Discussion / Mach 3 Scaling Problem

« on: July 12, 2011, 03:59:49 PM »

I am relatively new to CNC and am in the process of learning and running sample g-code programs on a 3 axis mill routing machine that I recently built. I have encountered a problem with the size of the parts that I am cutting as they are considerably smaller than what the original design calls for.  I have also used the roadrunner program to test my machine and although my machine cuts it out, it end up being quite small. I initially thought that I  had set up Mach 3 incorrectly but when I checked the "Units" setting it was set for inches and the various g-code programs that I have used were also in inches and yet this problem persists. I am at a complete loss as to what is causing this peoblem and would certainly appreciate getitng some advice as to how to fix it.  Much appreciated.