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June 29, 2017, 04:37:26 am


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Author Topic: Different tool with same diameter problem  (Read 367 times)
kvom
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« Reply #15 on: June 05, 2017, 17:41:49 pm »

One kluge that will work around this issue is to make the tool diameter on the roughing cut something like 6.001mm.  Then CB thinks the tool needs to move after the tool change.
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R0bbie
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« Reply #16 on: June 05, 2017, 18:18:31 pm »

Hi Kvom,
I Don't know the word Kluge, Looked it up on Google and it describes it perfectly, in my words a dirty workaround which does the job.
as I wrote in my previous post make the tool 0,01mm larger and setting roughing clearance to -0,005mm solves the issue.

Regards,
Rob.
« Last Edit: June 05, 2017, 19:36:26 pm by R0bbie » Logged
dh42
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« Reply #17 on: June 05, 2017, 20:08:47 pm »

BTW, David will probably move this thread to general usage or post-processors.  It's certainly NOT a bug.

Lloyd

Hello

Hum, that looks like a bug .. IMHO

Lloyd trick solve the pb for the X move, but the Z move is wrong ; it go to Z0.1 instead Z1.1

( Profile2 )
G0 Z25.0
( T10 : 6.0 )
T10 M6
M3 S18000
G0 X-3.0 Y0.0 Z0.1
G1 F300.0 Z0.0
G1 F800.0 Y100.0

the right code
( Profile2 )
G0 Z25.0
( T10 : 6.0 )
T10 M6
M3 S18000
G0 X-3.0
G0 Z1.1
G1 F300.0 Z0.0
G1 F800.0 Y100.0

As say Rob, changing the to a small amount, and the G0 X.. is coming back

++
David

Edit: The pb is the same with the 'default' post processor
« Last Edit: June 05, 2017, 20:20:18 pm by dh42 » Logged
lloydsp
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« Reply #18 on: June 05, 2017, 20:41:50 pm »

Well, David,

I'm not sure what's going on, but I just RAN a job on my machine with two different tool numbers for the same-sized cutter (same cutter, in fact).  In my case, I changed tool numbers in order that I might move some clamps after the first operation.

Mine did nothing LIKE what you are seeing there.  Mine handled each pocket as if it were a separate job.  All the correct feeds, plunges, everything.

The only thing I can see there is that both the rough and finish operations start and end at the same point, so that's 'fooling the pp' somehow.  FWIW, my two pockets overlap, but are different sizes.

I'm sure - therein - lies the issue we'll eventually find.

I thought, when I ran his job with my pp, that it worked properly.  I'll have to go look again.

LLoyd
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dh42
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« Reply #19 on: June 05, 2017, 21:37:38 pm »

I think you find the pb

If I just change the start point for the second mop, the right X and Z move are coming back in the Gcode.

++
david
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lloydsp
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« Reply #20 on: June 05, 2017, 21:53:02 pm »

Hooray!  Good check, David!

Lloyd
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Dragonfly
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« Reply #21 on: June 06, 2017, 08:19:50 am »

Didn't want to interrupt the discussion until a solution is found but I must admit I read the OP diagonally and didn't get the essence of the problem right.
While I don't see this as a typical bug it is an odd case of coincidence where the logic of G-code generation is right but the actual result is unpredictable. Maybe it's better to hard code the move at safe Z after tool change even if the next MOP starts at the same position. Wouldn't cost any significant time but will be on the safe side.
Writing this I am not sure whether it is done in the PP or is coded in the main program.
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