Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: embodiedmedia on November 24, 2015, 02:11:21 AM
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hi
I'm having problems with the z accuracy on my router - its a basic 6040 chinese model but has been pretty useful so far. Im running mach3 under xp and am using a usb interface
so I zero off the bit on the workpiece and then hit either ref all zero or zero x y and z manually ...
i then jog it up so I can snap my dust hood on -
I then press the goto zero button in mach 3 expecting the bit to go reliably back to the surface position
sometimes this works but sometimes the bit plunges a few mm into the part - eek ..
any idea what might be happening?
regards
keith
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Hi Keith,
Don't hit the Ref All Zero button - just zero the X, Y, Z manually - this should resolve your immediate problem.
Tweakie.
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thanks tweakle
so i just tried what you said - first and second time it returned to exactly the right spot after the arbitrary z jog, the next time i jogged up and hit the goto zero it plunged about a 8 mm into the stock. at finish of the move the readout in mach still said z = 0
it then occurred to me that when jogging up that 3rd time i was hitting the limit of travel of the z - and it must therefore be losing steps at that time - this does seems to be the cause of the sometimes error -- sounds right to you ?
cheers keith
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Sounds right to me ;)
Tweakie.
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You can also setup "Soft limits" so it will not hit the hard-stops, given that the steppers not loose steps :-)
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good calll - many thanks1