3D Corner Probe Problem

[ddexd]

I'm having a problem with the 3D corner probe operation. Other operations seem to work fine except 3D corner.

No matter which corner of a work piece I choose to perform the corner probe on the final move of the z-axis does not go to the z-clearance on the last move. Instead the Z-axis starts traveling up until it reaches the end of travel and I have to hit the Mach3 Rest button to get it to stop.

The other 3D corner probe operations to find the x and y zero locations works its just the final movement (step 10 in manual description of 3D corner probe operation) doesn't stop where it should. I've attached screen shots of my setup.

Dave

[DaveCVI]

OK, please tell me the basic info:
1) MSM version
2) mach version
3) probe tool in use
4) motion device (PP or Smooth stepper or?)

Do these three operations work correctly?
a) down and over X+
b) down and over Y+
c) probe down to Z- (to find top surface)?

If they all work, but not the corresponding corner probe op (The circle area in the lower left corner of the block picture) , then I need to know if the problem is reproducible at will or is it intermittent?

Dave

[ddexd]

OK, please tell me the basic info:
1) MSM version <--2.2.1
2) mach version <-- 3.043.062
3) probe tool in use <-- 3D probe from CNC4PC
4) motion device (PP or Smooth stepper or?) <-- Ethernet SS with driver version v10r2d1d

Do these three operations work correctly?
a) down and over X+ yes
b) down and over Y+ yes
c) probe down to Z- (to find top surface)? yes

If they all work, but not the corresponding corner probe op (The circle area in the lower left corner of the block picture) , then I need to know if the problem is reproducible at will or is it intermittent

The circle area and the "edge" areas both end with the final move of z going positive up without stopping. This happens every single time I select the "circle" find corner or "edge" selections. The others operations appear to work find, such as the down then find edge of work piece, and the arrow head that finds the angle of the work piece.

[DaveCVI]

Hi,
Is there a specific reason for using mach 3.43.62?
While don't know of a particular problem with that mach release that would account for the issue, it may be worth trying mach 3.43.66 (the last stable release of mach 3).

In either case, I will email you instructions for getting an MSM log file of the corner probe operation. I can then look at the log and see if I can spot what is happening.

Dave

[ddexd]

I made the decision to use version 0.062 after reading the Mach support forums and the issues folks were having with version 0.066.

I've emailed you the log file. I did stumble across something interesting. With G43 ON the corner finding takes off in the +z direction, but with G43 OFF the corner finding works like it should.

Dave

[DaveCVI]

Hi,
I looked thru the log file - it appears that it's doing just what it thinks it should.
I believe the clue is that you run out of travel when TLO is on.... The log shows that the probe tool TLO = 5.531 which is also the physical length of the probe tool.

The last move in the log file is:
here is the position just before the move:
WC Z: -0.165334 = MC Z: -0.134465 - WCO Z: -5.500131 - G52 Z: 0.000000 - TLO: 5.531000

G91 G31 Z5.668612 F25.000000

Is 5.531000 inches what you expect for a TLO value?

Dave

[ddexd]

With TLO active on the other operations to find top of work piece and find center of work piece finish as expected with the probe sitting z-clearance above the work piece. So why does the find corner operation with TLO work differently then?

The write up on the user manual states step 10 moves to z clearance above top surface.