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Tool length offsets G43 G44
« on: February 09, 2008, 05:33:14 PM »
Hi everyone,I have just upgraded Mach to 2.63 from a previous version. (No. V???)

For the past 6 months+ I have been setting the various tool lenght offsets via the offsets page. This loads the lenght differences into the tool table.

In the G code I put     N0021 T1 M06 G43 L1 (10MM SLOT) to set the lenght offset for Tool 1 and the same for subsequent tools, i.e T2 M06 G43 L2
All this worked fine.
Now with V2.63, it appears that any tool longer than the ref tool zero has the offset added instead of subtracted.
So if the tool is longer by 10mm than T0, instead of subtracting 10mm of the lenght of that tool so it sits at Z0, the tool is effectivley being burried at Z-20
or at least that's what appears to happen.
The code is the same as I was running but now crashes the tool that is longer than T0

In the manual it refers to G44 for negative offsets, but I have not had to use this in the past, has the way Mach handles tools longer than the ref tool changed.

I'm a bit confused.
Any help would be most appreciated.

ATB
Derek

PS this graphic shows my situation exactly   http://www.machsupport.com/forum/index.php/topic,5171.0.html

 
You can "chop it off" but can't "chop it on"
Re: Tool length offsets G43 G44
« Reply #1 on: February 10, 2008, 06:01:28 AM »
Hi,

Just found this from Brian . . . .

"The Standard way to do a
toolchange is to have it on two lines...
For example:

M6t5
g43H5"

So I guess thats the first thing I will try.
Also, I have specified the tool offset table incorectly as T1 L1 instead of T1 H1 etc.

Still not sure why the programs worked before though?

ATB

Derek.

You can "chop it off" but can't "chop it on"
Re: Tool length offsets G43 G44
« Reply #2 on: February 10, 2008, 04:57:54 PM »
Hi Everyone, (is anyone there ;) )

I put the G43 H1 on the line below M6 T1 and hey presto everything is working again as it should.
I edited the gcode back to 'all on one line' and things go cranky and back again and all is well.

It does not appear to be a problem if I use L1 or H1.

Hope this is also useful to anyone else who might be having problem with TLO s.

ATB

Derek.
You can "chop it off" but can't "chop it on"

Offline Hood

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Re: Tool length offsets G43 G44
« Reply #3 on: February 10, 2008, 05:56:55 PM »
Thanks for sharing the info Derek. I do remember seeing this problem discussed a week or two back, glad you got things straight.
Hood

Offline Chip

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Re: Tool length offsets G43 G44
« Reply #4 on: February 10, 2008, 09:33:00 PM »
Hi, Derek & Hood

Dose seem Quiet around hear the last coupple Day's.

Chip