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Messages - paulrockhopper

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General Mach Discussion / Re: Strange axis calibration?
« on: June 23, 2013, 04:01:21 PM »
Well, firstly thanks for replying Hood. I have just got in from the workshop and realised while I was  trying to go through everything logically that whilst entering the tool data into V carve pro , I was actually entering the size incorrectly when running the toolpaths for different shapes to test DOH!!!!
This in turn led to further adjustments...... and basically after 4-5 hours of stress ended up where I started only now entering the correct data.
So Lesson for the day , dont do work when you have been up since 4am, and secondly before deciding that your machine has major issues it could well be yourself  :)
Thanks again Mr Hood for taking the time, much appreciated 
Paul

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General Mach Discussion / Strange axis calibration?
« on: June 23, 2013, 07:06:39 AM »
Hello everybody ,
I have recently built my own machine which has been cutting for a few months and everything seemed fine. I calibrated the steps per mm using a dial gauge and the machine cut perfect circles. However over the next couple of days I have been asked to cut some very accurate sign plates which will have vinyl attached to them.
Anyhow my problem is this:- when set as per my dial gauge readings I can repeatedly cut perfect circles at the correct dimension. However when I try to cut a rectangle at say 400mm by 100mm one axis is a tad longer (say 101 )and the other shorter (say 395). If I treat this discrepency as a percenage and adjust accordingly to my steps per mm, sure enough I then cut the rectangle correctly. However the circle is then eliptical (which you would expect , given both x and y run rack and pinion of the same type so clearly need the same steps pr mm).
Do you think I am missing something here?
Is there a setting in mach 3 for when axis move in a perfect linear fashion, and counter that when running in circles so to speak!
I just cant work this out , but the longer the distance the greater the error so I dont think it is backlash, as surely this would only apply on direction changes.
Thanks for any help regarding this,

Paul

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