Wrapped post processor for EMC2
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Wrapped post processor for EMC2
I have just recently added a 4th axis rotary to my CNC router. I am using V-Carve Pro. Does anyone have a PP that can be used for EMC2? Any help would be appreciated
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- Vectric Wizard
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Re: Wrapped post processor for EMC2
JudeDude
What PP are you presently using? What configuration is your machine? A axis rotating around X axis?
Greg
What PP are you presently using? What configuration is your machine? A axis rotating around X axis?
Greg
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Re: Wrapped post processor for EMC2
I am using the emc post in VCarve Pro 6. I have the rotary configured as an A axis in degrees. The rotary is parallel to the X axis so I would be wrapping the Y values. I tried to generate the G code using the emc post by it gave me X and Y values not the wrapped code I was expecting to see.
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Re: Wrapped post processor for EMC2
Some pictures of the rotary. I used part of a sherline lathe and a couple of timing pullys. I cut the stepper mount and baseplate on my CNC.
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- Vectric Wizard
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Re: Wrapped post processor for EMC2
Try this PP. Based on the EMC2 one.
Test in the air before committing tooling.
Greg
Test in the air before committing tooling.
Greg
- Attachments
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- Emc2_Wrap YtoA_inch.pp
- (3.04 KiB) Downloaded 550 times
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Re: Wrapped post processor for EMC2
Greg I ran the geometry thru the post processor. The G code created values for A from about -560 to -460. The rotary is set up for 360 degrees and it doesn't like negative values. I expected the output to be between 0 and 360. I could change the set up to cope with the negative numbers but i don't want the work to rotate one and 1/2 times to start. This might work if we subtracted 360 and made the numbers positive.
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- Vectric Wizard
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Re: Wrapped post processor for EMC2
Negative values are as legitimate as positive. Depends where you set the origin.
Post the Vcarve file which is giving -560. I will take a look.
Greg
Post the Vcarve file which is giving -560. I will take a look.
Greg
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Re: Wrapped post processor for EMC2
Greg you are right I corrected the rotary configuration. Now it runs. The G code does have areas without Z heights. The rotary is moving really slow at these points. I am looking at feed rates right now. The velocity and acceleration seemed OK in the configuration. I am using 1/2 stepping because Daves Hobby CNC board misses steps at 1/4 stepping with his current reduction.
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Re: Wrapped post processor for EMC2
Greg
I been at the EMC form trying to understand this behavior. Basically the velocity cutting on a small diameter is not the same as that velocity on a larger diameter. Is there anyway the PP can adjust the feed rate based upon the wrap diameter input into V Carve and use this feed rate for the rotary only milling moves.
I been at the EMC form trying to understand this behavior. Basically the velocity cutting on a small diameter is not the same as that velocity on a larger diameter. Is there anyway the PP can adjust the feed rate based upon the wrap diameter input into V Carve and use this feed rate for the rotary only milling moves.
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- Vectric Wizard
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Re: Wrapped post processor for EMC2
Mach3 has an inbuilt feature to compensate the rotary axis feedrate, based on the diameter that the tool is cutting.judedude wrote: Is there anyway the PP can adjust the feed rate based upon the wrap diameter input into V Carve and use this feed rate for the rotary only milling moves.
Shopbot code has the ability to scale an axis feedrate. Gcode does not.
I have no experience with EMC. Perhaps it has a similar feature as Mach. I can't help you much there.
Greg