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Author Topic: Tool Offset Macro...  (Read 24857 times)

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Offline Davek0974

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Re: Tool Offset Macro...
« Reply #70 on: August 16, 2016, 09:18:40 AM »
I have been testing this to death since my crash, I use tools made from Tig rods :)

tool offsets are negative if the tool is shorter than the main ref device, positive if longer.

I have only tried negative offsets as that is what is needed, its just the math for the Z when running that piece of code gives a negative so the Z tries to plug rather than lift as it should.

It works perfectly if no offset applied.

If i follow the steps carefully, it works perfectly as i would expect it to :-

Find the surface with the surface probe as tool zero, then select a tool, set the tool number and away you go.

Just DON'T do an auto G31 tool probe with an offset applied.

I've blocked it now so i should be safer, but is the logic here correct in my last reply??
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Davek0974

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Re: Tool Offset Macro...
« Reply #71 on: August 16, 2016, 02:16:09 PM »
Upgrade done, nice and easy too ;)

Now running .062

Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Davek0974

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Re: Tool Offset Macro...
« Reply #72 on: August 17, 2016, 05:31:32 AM »
Just had a reply from CS-Labs re the probing crash, It seems i am correct that probing must be done with tool zero or a tool with NO offset entry - they sent me a macro and it will only run on tool zero - just as mine does now.

That explains the crashing then :)
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline rcaffin

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Re: Tool Offset Macro...
« Reply #73 on: August 17, 2016, 07:20:15 AM »
Hi Dave

Well, most interesting information. I will remember that. Thank you.

Cheers
Roger

Offline Davek0974

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Re: Tool Offset Macro...
« Reply #74 on: August 17, 2016, 07:21:55 AM »
Its just the math - having an offset gives a result for Z that can change a small upward lift to a large downward plunge.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline rcaffin

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Re: Tool Offset Macro...
« Reply #75 on: August 17, 2016, 07:45:36 AM »
And a snapped stylus ...
 :-[

Offline Davek0974

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Re: Tool Offset Macro...
« Reply #76 on: August 17, 2016, 08:11:01 AM »
If it was a large offset, it can be worse, when i first had it happen it ripped the Z-drive apart on my conversion project, luckily the part that broke was cast iron, it's steel now so a future crash would be far worse, even a 400w ac servo and 2:1 drive has a frightening amount of power in it.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline rcaffin

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Re: Tool Offset Macro...
« Reply #77 on: August 17, 2016, 05:31:41 PM »
I have a current limit on the (DC brushed motor) servo drivers and a fast magnetic circuit breaker on the supply to each servo driver. There have been times when I have had to reset the breaker on an axis. Beats the hell out of rebuilding the mechanics though. A small W28-XQ1A-5 breaker by Potter & Brumfield.

Cheers
Roger

Offline Hood

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Re: Tool Offset Macro...
« Reply #78 on: August 17, 2016, 06:36:14 PM »
AC Servo drives normally have  an option to set a max current.
However I think the problem with the Z Axis on a manual Bridgeport is there is no real way to make the connection to the quill strong and if the bracket is fairly sturdy  then there is a danger of destroying the thread in the quill.

Hood

Offline Davek0974

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Re: Tool Offset Macro...
« Reply #79 on: August 18, 2016, 02:12:33 AM »
Yes, that quill connection is a real weak spot. It places a lot of twisting action on the ballscrew nut as well. There probably is a current limit option but the manuals are a bit scary Chinglish at best.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives