Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: melcat on April 25, 2008, 05:03:09 PM
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Hello,
I am an experienced machinist and just want to know can you put in minus R values while using canned cycles for drilling.
So if you are drilling holes on the surface i.e. 'Z' zero you put in the following for example G81 Z-10 R2.(This is metric not inch figures).
This feeds down to Z depth of -10mm from Z zero starting at 2mm above surface.
Now if I had a pocket that was 40mm deep and needed several holes in the bottom face can you put a minus R value so it does not have to feed from the top Z zero surface.
Example G81 Z-43 R-38.
This rapids down to 2mm above surface of pocket base and then feeds from here to drill through base wall at 43mm depth.
I have worked with various verticle and horizontal CNC milling machines and they have this feature.
If this can't be done, I will carry on by programming each drilled position without a canned cycle for drilling.
Thanks
Mel
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Yes, seems like you can, I have just checked by doing it in the bolt circle wizard and it seems to work fine in the simulation.
Hood
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Hi there,
Yep, it does work on simulation. I will try this tomorrow morning on the machine.
Being in the UK its nearly time for bed for me.
Thanks
Mel
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I am in Scotland so time is similar :)
Hood
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Sorry didn't see your location there, I must be tired.
Mel
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Ha ha, no problem, where about are you in the UK?
Hood
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Bedfordshire, I'm 45miles from London.
Smack in the middle of Milton Keynes, Luton and Aylesbury.
Mel
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Its great to see more UK users of Mach here.
Hood
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Yep.
Probably the best one out the lot.
I have seen others but none as informative as this one.
Just need more time to post more, I am developing a new CNC milling machine from scratch, hopefully might be able to sell it once done.
Currently designing high power control box. This will be available soon.
Mel
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Sounds interesting, keep us informed how things are going and maybe post some info and pics in the ShownTell section.
Hood