Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Transformer on November 12, 2014, 11:43:49 PM
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I am using Mach3 Lathe and getting ready to make my first cut. Thought I would start out with the OD Facing wizard.
I set X Start to zero to face from the centre outward. However the simulation always starts X beyond the centre line by the amount I have entered for Z Clearance. This in radius mode. If I am in diameter mode X starts beyond the centre line by twice the amount I have entered for Z Clearance.
I can get the wizard to work by entering values for X Start based on the above rules but I would like to understand why I cannot use zero for X Start. Is this just the way the wizard works or am I missing something.
Dennis
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Hi
What figure are you putting in for the z clearance?
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Personally, unless it there is an ID on the part, I would work from outside to centre when facing.
That however is not your question, what you will need to do is have the Z clearance just marginally larger than your roughing cut depth.
For example if you have a rouging depth of 0.5mm then set the clearance to 0.501 and you should get more or less what you want.
Hood
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I think you also have to compensate for the tool tip radius also when starting beyond center to cut the face completely.
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I was using a z clearance of .25. As suggested by Hood I adjusted the Z clearance to just a bit more than the roughing cut and the X cut only starts that amount beyond the centre of the piece. So I guess that is just the way the wizard works. If you want to start your cut at the centre of the piece you have to set X Start equal to Z clearance. I can live with that idiosyncrasy of the program I just wish I knew why it worked that way.
Tool tip radius? I have not looked at that, need to learn to walk before I try running.
Now to try and understand machine coordinates and program coordinates.
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Now to try and understand machine coordinates and program coordinates
Attached should help.
RICH
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Hi
I just started up my home made slant bed lathe and was programming using the wizard. I put in the numbers and was posting the code and got up a warning: ...FilletRadius is too big...
The filling radius was +0.000
I tried to change the values but it did not go away. I also re-started Mach3 but warning is still there.
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Another question, when jogging the Z axis the arrow key on the pc keyboard is opposite How can I change this? The X is correct. The Z is correct with regards to +/- + is towards the chuck.
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- should be towards the chuck, sorry.
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How can I change this?
Config>System Hotkeys Setup
Click the jog hotkey of choice and then touch the associated key on the keyboard.
RICH