non rigid tapping

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16 Aug 2012 02:29 #23279 by clkeck1
clkeck1 created the topic: non rigid tapping
My mill doesn't have a spindle encoder so i got a floating tap holder so i don't have to manually tap all the holes.

I set everything up tonight but when i went to write the program it looks like EMC doesn't support this. Am i missing something?

Thanks
Cory
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16 Aug 2012 04:13 #23280 by cmorley
cmorley replied the topic: Re:non rigid tapping
hmm not that I have done this but
isn't a case of start the spindle,
feed at the pitch rate,
stop the spindle,
reverse the spindle
feed out at the pitch rate?
probably with some dell times to wait for the spindle to stop etc.
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16 Aug 2012 06:12 #23282 by mhaberler
mhaberler replied the topic: Re:non rigid tapping
Chris,

I got interested in that and had a long discussion on floating tap with Rob Harpham and some with Cradek on the issue.

I did an implementation of G84.1/G74.1 and the status is here: git.mah.priv.at/gitweb/emc2-dev.git/shortlog/refs/heads/g84-dev

I never integrated it into master because it does a bad sales job on my remapping work.. everything in it can be done with a new remapped G code except for this:

we agreed that on retract it is not a good idea to wait for the spindle-at-speed signal before beginning the retract move. So I adapted the SPINDLE_ON canon/nml message to carry an optional wait_for_atspeed flag, which defaults to true, and motion support to honour that.

I can surrect that patch and integrate it into master, if you drum up some support on the dev list.

- Michael
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16 Aug 2012 09:55 #23283 by cncbasher
cncbasher replied the topic: Re:non rigid tapping
i'd be interested in this Micheal ..

Dave
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16 Aug 2012 12:15 #23290 by mhaberler
mhaberler replied the topic: Re:non rigid tapping
clkeck1 wrote:

My mill doesn't have a spindle encoder so i got a floating tap holder so i don't have to manually tap all the holes.

I set everything up tonight but when i went to write the program it looks like EMC doesn't support this. Am i missing something?

Thanks
Cory


Cory,

you are not missing anything.

I suggest you add a feature request here: sourceforge.net/tracker/?group_id=6744&atid=356744

which will give me an excellent excuse to merge the relevant parts of the branch I mentioned below :laugh:

regards,
Michael
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20 Sep 2016 16:42 - 20 Sep 2016 16:58 #80677 by terkaa
terkaa replied the topic: Re:non rigid tapping
Should this still work with current master? I tried to create a ticket at sourceforge but did not have enough rights :evil:


Tero
Last Edit: 20 Sep 2016 16:58 by terkaa.
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26 Sep 2016 15:16 #80935 by Helge Thaysen
Helge Thaysen replied the topic: non rigid tapping
:( I have the same problem on my old mill, I use a reaming cycle and ad some extra lines for every thread, costs some taps!
So a G84 is urgent needed.

regards Helge
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17 Nov 2016 20:17 #82924 by terkaa
terkaa replied the topic: non rigid tapping
G84/G74 is now added to current Master: github.com/LinuxCNC/linuxcnc/commit/42ff...3c29565323ee1944462e

Tero
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