Centroid Community CNC Support Forum

2.5D Planar Compensation is active in CNC12 v5.0+ but, in beta mode and is available to try out.
draft "2.5D VC" instructions attached.

With this feature you can take a bow or angle out of and axis.
This beta feature is the precursor to full 3D volumetric compensation.

Videos.

Demo VC Video part 1


Demo VC Video part 2


Demo VC Video part 3


Demo VC Video part 4 How to verify with CNC12 and pitfalls.


How to Create VC tables Video

Excellent! This seems just the ticket to compensate Z for table droop on a knee mill when X is overhanging at the ends of travel.

Great.

Thanks for this useful function, very handy to get a machine geometric better, if it is too much effort to correct physically.

You are maybe the first to offer this for DIY CNC.

Mituitung dial indicator ?

Uwe

suntravel wrote: ↑Thu Oct 05, 2023 12:32 am Great.

Thanks for this useful function, very handy to get a machine geometric better, if it is too much effort to correct physically.

You are maybe the first to offer this for DIY CNC.

Mituitung dial indicator ?

Uwe

Thanks! on the indicator.... I was at a customers place deep in the jungle.

new rev3 document uploaded, link in original post.
new video added as well. How to verify CNC12 VC is working, and pitfalls

And here VC in users use



Uwe

VC is working on lathe/Acorn6 also, but with small bugs

It will only be active if 3rd axis, in my case C, is set to Y (on), but no comp table for 4th axis Y ist generated.

Also it effects the DRO in G54 and Machine coordinates, so you will not see the position in the G-Code but the calculated position from cnc-z.tab but it works if the spindle stock is out of perfect geometry.

Uwe

Also it effects the DRO in G54 and Machine coordinates, so you will not see the position in the G-Code but the calculated position from cnc-z.tab

That does not sound right.

If I run "G0 X0 Z0", then the move should apply whatever compensation is required per the tables, and it should end with the DRO reading X0 Z0.

If the place that the machine goes to when commanded to go to X0 Z0, is different from the place where the DRO reads X0 Z0, then there are going to be problems with part setup.

When you use F1/Setup -> F1/Part, or G92 (on a mill) or G50 (on a lathe) to zero the DRO at the current position, does the DRO then read zero? If you subsequently command the axis to move to zero, does it move back to the same position where you set zero?

Yes, only a small bug in the DRO.

It moves like the compensation table is set up, but if you have 0.17mm compensation and command X0, the DRO shows 0.17mm at that Z position.

You can see this here at the end of the video.



At least it works to compensate an out of alignment headstock in 2D, but not in 3D space with Y axis on a lathe.

Uwe

fyi.. we put full 3D VC on the back burner for a bit, as we are devoting all programming resources to all new CNC12 Router for Acorn, USB BOB, CNC12 Router and Plasma for Hickory! along with a Hickory Wizard. When those projects are finished we are going to circle back around to finishing off the 3D VC feature