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General Mach Discussion / Scale change when running G-code

« on: March 17, 2011, 07:49:39 AM »

I am new to mach 3.  I compiled a test program using MasterCAM (and supposedly the right post-processor).  My 3-axis unit will manually jog in an accurate (real) scale.  Meaning - Mach 3 says I moved an inch and I in fact have moved an inch.  But when I run G-code it changes the scale drastically.  I haven't experimented much with commands and settings.  Hopefully I am missing something easy.  I would appreciate any help.  Thanks in advance.