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General Mach Discussion / Re: non repeating z moves
« on: November 24, 2015, 06:07:23 PM »
good calll - many thanks1

General Mach Discussion / Re: non repeating z moves
« on: November 24, 2015, 05:55:18 AM »
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

General Mach Discussion / non repeating z moves
« on: November 24, 2015, 02:11:21 AM »

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?



Ok - that seems to work :) - my understanding with the regen tollbooth function is that it it is only necessary for visual accuracy - i.e. after loading a new program or doing the tool change we are discussing I dont need to regen the tool path before starting with this subsequent cut ?

Thanks heaps guys for your information  .. Could I also ask .. Is it necessary to hit the zero z button at touch off with machine coordinate button both active/on and inactive/off .. I can't zero out both without hitting ref all home ..

Hi folks

I have a simple chinese 6040 router table and I use small manually interchangeable bits - as I mainly cut small scale wood pieces.  I design the work in Fusion 360 and spit out the code from the CAM section.

Im having a problem with changing tools -  and getting errors in z heights in the cut. 

I typically split my code into per tool blocks. My basic process is as follows:

With the bit back at x-0, y=0, I change the bit manually - and then Set the z height of the bit - using the slipping a sheet of paper under the bit end method ...

I then click ref all home to zero the new z value - and check that z value is 0 as I toggle the machine coords button.  If either isn't I use the zero z button. .. I then region the tool path .. and then I continue the cut ..

Trouble is something is going wrong and Im getting errors of in the overall z value  - sometimes as much as 4-5 mm out.  Whilst I set the dimenesions of my tools in Fusion 360 Im assuming that it thinks every tool gets zeroed before use - i.e. that the error is in how Im using Mach 3 - not the CAM package.

Any ideas what Im doing wrong?  Would much appreciate your assistance.



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