Avoid going to Safe Z after each pass

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Avoid going to Safe Z after each pass

Postby Jibeji » Fri Nov 03, 2017 7:43 pm

Hello,
I am machining a pouch of 20 mm depth, with passes of 0.3 m, which means more than 60 passes.
At the end of each pass, the Z axis goes to Safe Z position then plunges at z-rates which is quite sloooooow.
Is it possible to avoid that?
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Re: Avoid going to Safe Z after each pass

Postby Mobius » Fri Nov 03, 2017 7:53 pm

SafeZ.jpg


Have you tried adjusting this feature, under Material Setup? You can set a rapid Z movement height.

It won't help you as you get further down into the material, but it should cut down some of the time.
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Re: Avoid going to Safe Z after each pass

Postby Jibeji » Fri Nov 03, 2017 8:13 pm

Hi mobius,
Both are set to +5 mm, but between +5 and -20 it goes at z-rate
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Re: Avoid going to Safe Z after each pass

Postby mezalick » Fri Nov 03, 2017 8:22 pm

Tim Merrill posted this many years ago..
Add some space between your project and the end of your job setup.
See attached picture..

Michael
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Re: Avoid going to Safe Z after each pass

Postby Jibeji » Fri Nov 03, 2017 8:30 pm

Michael,
I am not sure to understand...

In the G-code file, I can see a "G0Z5.0800" command at the beginning of each pass.
It would be really better with relative coordinates than absolute. I will suggest that to Vectric.
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Re: Avoid going to Safe Z after each pass

Postby Adrian » Fri Nov 03, 2017 9:03 pm

The pocket toolpath always lifts before doing the next pass. On a simple shape it seems wasteful but there are many instances where if it didn't do that the move for the next pass would plough through material that hadn't been cut.
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Re: Avoid going to Safe Z after each pass

Postby mezalick » Fri Nov 03, 2017 10:00 pm

Adrian wrote:The pocket toolpath always lifts before doing the next pass. On a simple shape it seems wasteful but there are many instances where if it didn't do that the move for the next pass would plough through material that hadn't been cut.


Adrian,
I would disagree the the pocket toolpath always lifts..
Please see attached picture..

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Re: Avoid going to Safe Z after each pass

Postby Adrian » Fri Nov 03, 2017 11:09 pm

That is only one pass though so it has no need to lift for a 2nd pass. The OP has 60 passes in his toolpath.
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Re: Avoid going to Safe Z after each pass

Postby mezalick » Sat Nov 04, 2017 8:27 am

10 passes, still no lifting...
And a side view with 60 passes,,,no sign of lifting...

Unless I'm misunderstanding the problem......

Try it my way and see what you get.

~M
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Re: Avoid going to Safe Z after each pass

Postby Jibeji » Sat Nov 04, 2017 8:47 am

Hi,
This behavior can not be viewed in the 3D model.
Better than an explanation, here is the G-code :

T1
G17
G21
G90
G0Z20.3200
G0X0.0000Y0.0000S12000M3
G0X3.9733Y18.2600Z5.0800
G1Z-0.8200F30.0
G1Y1.7400F600.0
G1X2.7733
G1Y18.2600
G0Z5.0800
G0X1.5000Y18.5000
G1Z-0.8200F30.0
G1X4.5000F600.0
G1Y1.5000
G1X1.5000
G1Y18.5000
G0Z5.0800
G0X3.9733Y18.2600
G1Z-1.6400F30.0
G1Y1.7400F600.0
G1X2.7733
G1Y18.2600
G0Z5.0800
G0X1.5000Y18.5000
G1Z-1.6400F30.0
G1X4.5000F600.0
G1Y1.5000
G1X1.5000
G1Y18.5000
G0Z5.0800
G0X3.9733Y18.2600
G1Z-2.4600F30.0
G1Y1.7400F600.0
G1X2.7733
G1Y18.2600
G0Z5.0800
G0X1.5000Y18.5000
G1Z-2.4600F30.0


The tool goes to Safe-Z (5.08 up) after each pass.
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Re: Avoid going to Safe Z after each pass

Postby IslaWW » Sat Nov 04, 2017 12:26 pm

Yes, it is possible to avoid that. But only by changing your existing settings.

1) Increase the pass depth for the tool
2) Increase the feedrate for the Z (ramp in)
3) Add the "Rapid Plunge" feature to your post P: https://youtu.be/fHCgR5K0uoM (page 6 of the postP editing guide)
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Re: Avoid going to Safe Z after each pass

Postby Jibeji » Sat Nov 04, 2017 12:33 pm

IslaWW wrote:1) Increase the pass depth for the tool
2) Increase the feedrate for the Z (ramp in)


Pass depth and plunge speed depend on the spindle, tool and material. This can not be changed abritrary to get the software running faster !
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Re: Avoid going to Safe Z after each pass

Postby IslaWW » Sat Nov 04, 2017 1:17 pm

It appears that you have answered your own question
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Re: Avoid going to Safe Z after each pass

Postby Jibeji » Sat Nov 04, 2017 2:19 pm

Yes, there is no solution. :cry:
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Re: Avoid going to Safe Z after each pass

Postby Adrian » Sat Nov 04, 2017 2:30 pm

There is if it's a big issue for you. Remove the moves from the g-code.
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