Back or front tool

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02 Oct 2021 09:34 #222001 by john11668
Replied by john11668 on topic Back or front tool
Machine sets itself up in back tool mode as that is called up in ini file .
For RH thread I could use threading tool reversed in back tool and reverse the spindle but it is then prone to saddle lift,

Hence this question. Will maybe get a chance to try G10 and R180 over the weekend . Sounds like we are in for grotty weather.

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02 Oct 2021 17:11 #222034 by john11668
Replied by john11668 on topic Back or front tool
Right so called up G10 L2 P06 R180 and it tells me " invalid parameters in linear command"
And "linear move on line 13 would exceed Y's positive limit " And I dont have a Y axis ???????
Line 13 calls up G0 X10 Z10 both within limits.

Help please ??

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05 Oct 2021 05:22 #222247 by newbynobi
Replied by newbynobi on topic Back or front tool
just a curious question.
Did you try to enter a negative pitch while in back tool lathe mode?

By the way, this is not a gmoccapy behavior, it seems to be a trajectory planer issue.

Norbert
The following user(s) said Thank You: anfänger

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07 Oct 2021 10:08 #222438 by john11668
Replied by john11668 on topic Back or front tool
Hi Norbert
I did not try a negative pitch .
I thought that would just alter the z motion and I can do that by specifying a negative start and and cutting toward z positive ..
Will give it a try though and report back.

Will also try setting a negative thread depth and if that does not work maybe a negative regression. Must look at the code for internal threads canned cycle to see if any clues there.

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07 Oct 2021 15:09 #222462 by Aciera
Replied by Aciera on topic Back or front tool
As a last resort you could also setup two switchable kinematics.

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07 Oct 2021 20:54 #222487 by andypugh
Replied by andypugh on topic Back or front tool

Will also try setting a negative thread depth and if that does not work maybe a negative regression. Must look at the code for internal threads canned cycle to see if any clues there.

Diameter stuff shouldn't care, as smaller-X = smaller-dia regardless of front or back tool. 

 

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10 Oct 2021 17:28 #222776 by john11668
Replied by john11668 on topic Back or front tool
There is a difference though
To reduce diameter with back tool x minus requires the saddle to move downwards where as this has to be reversed for front tool.

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12 Oct 2021 22:32 #222980 by andypugh
Replied by andypugh on topic Back or front tool

There is a difference though
To reduce diameter with back tool x minus requires the saddle to move downwards where as this has to be reversed for front tool.

That's a config thing if there is only one toolpost. If there are both front and back toolposts, then, yes, it's complicated. 
 

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12 Oct 2021 23:14 #222986 by john11668
Replied by john11668 on topic Back or front tool
Compicated ? or impossible ?
If complicated then a few pointers might be nice

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14 Oct 2021 00:03 #223053 by andypugh
Replied by andypugh on topic Back or front tool
Do you actually have both front and back toolposts?

One workaround is to program one toolpost in negative X. it's a bit of a kludge.

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