INCREMENTAL THREAD

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01 Feb 2014 00:10 - 01 Feb 2014 19:03 #43376 by mario_rl
INCREMENTAL THREAD was created by mario_rl
HI,
I NEED TO PERFORM A INCREMENTAL THREAD. NOW I'M PLANNING TO RETROFIT A CNC MILL (HEIDENHAIN TNC155) TO LINUXCNC. WILL BE POSSIBLE TO DO THIS WORK?.
ALSO, I HAVE ANOTHER MACHINE WITH A HEIDENHAIN TNC360, SO IT CAN CONTROL A FOURTH ROTATIONAL AXIS, BUT DON'T KNOW A WAY TO PERFORM THIS TASK.
HAVE ANYBODY EXPERIENCE ABOUT THAT?
THANKS IN ADVANCE, MARIO (AND SORRY FOR THE "WEIRD QUESTIONS" :unsure: )
PD: NOTE THAT IN THE THREAD, THE NOTCH WIDTH IS ALWAYS THE SAME, BUT THE CREST WIDTH IS DECREMENTING.
Last edit: 01 Feb 2014 19:03 by mario_rl. Reason: attach image

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01 Feb 2014 19:30 #43396 by ArcEye
Replied by ArcEye on topic INCREMENTAL THREAD
Hi

Can you explain the thread you need in terms of this diagram
notch and crest width are a bit vague



As far as the controls go, Linuxcnc can control the machines in the same way that the Heidenhain controls do, albeit you may have to use some extra interface boards

regards
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03 Feb 2014 15:38 - 03 Feb 2014 16:04 #43482 by mario_rl
Replied by mario_rl on topic INCREMENTAL THREAD
hi, sorry but i tryed to attach a picture and it didn't work.
Last edit: 03 Feb 2014 16:04 by mario_rl. Reason: attach

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03 Feb 2014 17:07 #43483 by ArcEye
Replied by ArcEye on topic INCREMENTAL THREAD
Should be OK using jpg png or gif under 500K

Give it another try

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03 Feb 2014 17:49 #43486 by mario_rl
Replied by mario_rl on topic INCREMENTAL THREAD
ok thanks i didn't know about exact limit in attachements, there is a trim... not a complete picture. But in essence, this is a polycarbonathe cylinder with a thread "incremental pitch" milled on it. The aim is to feed bottles in a filling machine so that arrive at a variable speed, but regard to incremental spiral geometry, at the end of the thread, the bottle speed and position is syncronized with the whole filling machine.
Very thanks in advance, Mario.

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03 Feb 2014 19:59 #43487 by ArcEye
Replied by ArcEye on topic INCREMENTAL THREAD
I see!

It is a bit of a cross between an archimedes screw and a barley twist chair leg. :laugh:

So long as you can accomodate it on your machine, I would imagine it could be cut quite well using a mill with a 4th axis, the main problem would probably be flexing of the material away from the cutter, it would need supporting throughout its length.

What you need however is the G Code to cut the 'thread'

Although you could code it by hand I suspect a CAD / CAM route would be easier.

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03 Feb 2014 21:57 #43496 by andypugh
Replied by andypugh on topic INCREMENTAL THREAD

I NEED TO PERFORM A INCREMENTAL THREAD.


Basically it seems to be a thread with a varying pitch.
If I was making one I would probably create the G-code in Excel, as a set of angular positions and calculated axial positions.
However, it could also be done by calculations inside G-code.
Consider a G-code loop iterating over angles in steps of (say) 10 degrees and calculating the required Z position.
#1 = 0
O100 while [#1 LT 3600]
G1 A#1 X[#1 * 20 + #1 * #1 * 0.2]
O100 endwhile

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03 Feb 2014 23:15 #43499 by mario_rl
Replied by mario_rl on topic INCREMENTAL THREAD
ok,
may be is there a soft to perform a simulation first?

Thanks, Mario.

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04 Feb 2014 01:55 #43506 by andypugh
Replied by andypugh on topic INCREMENTAL THREAD

may be is there a soft to perform a simulation first?


There is cutviewer.cncca.co.uk/ (as an example) though that is not Free, not free, Windows-only and doesn't do 4-axis simulation.
It looks like Vericut can do 4-axis: www.cgtech.co.uk/products/about-vericut/module-multi-axis/ but I think that is very expensive.
This is confusing.. Another package called CutViewer, but it looks like a different one: www.grzsoftware.com/cutviewer/
Available as a 30-day trial. Again not Free or free.
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