Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: meko19 on June 07, 2013, 10:11:29 PM
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I have an 5' x 10' cnc plasma made by http://www.ldrmotionsystems.com/ with torch height control and a hypertherm 45 plasma. I do not have the table grounded. The issue is when trying to set the home the gantry will touch the home switch and not back off the machine. If I try to cut the machine does not stay on path and can be eratic. This has started again, I have been cutting for the last 6-7 months with no issue. It seems it could be weather related since the weather is warmer here in Vancouver BC now and i havent had this issue since late summer last year. When I move the gantry the motors will have a different sound when it is not homing properly. If I leave the machine off for a few hours it seems to home and work properly for a short time. Could this be a grounding issue?
Thank you in advance.
Marko :)
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From what you describe the problem is more likely to be a temperature issue rather than grounding.
Check that you have adequate ventilation / cooling at both your PC and your motor controller. Are your motors perhaps getting too hot ?
Tweakie.
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Proper grounding of a plasma table is important both for your safety and for your electronic's well being.
Perhaps post #9 in this (http://www.cnczone.com/forums/plasma_edm_similar_machine_project_log/149910-grounding_computer-numeric-control_plasma.html) thread by Jim Colt of Hypertherm will help.
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The building is cool and the motors do not get hot. The machine will have this issue when it has been off for days as well, I am going to install a ground rod today to see if this will fix the issue since it should be done this way anyways and report back.
Thank you.