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General Mach Discussion / Re: Z coordinate shifts randomly when running various gcodes
« on: March 01, 2012, 01:08:10 PM »
Do you use a Zero Tool set? I had a problem like this awhile back on my Bridgeport.
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The info presented in this document may be of interest to you. http://cnc4pc.com/Tech_Docs/C10R10_USER_MANUAL_V2.pdf
You need to establish the voltage and if they are NPN or PNP. If this information can't be determined then it may be wise to replace then with new parts of known specification.
Tweakie.