problem with probe

[foxfly]

hello, when I measure the tool with auto tool G31, the measurement changes almost every time.
I use mach3 with uc300eth, can someone help me?

[ger21]

Can you explain the process you are using? Are you using a macro to measure your tool?
G31 by itself does not change anything, it just writes the trip point to a VAR.

[foxfly]

thanks for the immediate response, I use the ground on the frame and pin 15 on the block, the first measurement is always wrong after correct but if I change position the problem repeats itself. The contact is normaly open. Everything was normal with the PP.

[foxfly]

macro.txt

(649 Bytes) Downloaded 861 times

questa è la macro

[foxfly]

Help me

[Robertspark]

Try this one:

Code: Select all

Rem Auto Tool Zero Z- Metric Version
DownStroke = -25 'Set the down stroke to find probe
DownFeedRate = 100 'Set the down FeedRate
RetractStroke = 10 'Set the retract Stroke
RetractFeedRate = 300 'Set the retract FeedRate

CurrentFeed = GetOemDRO(818) 'Get the current feedrate to return to later
CurrentAbsInc = GetOemLED(48) 'Get the current G90/G91 state
CurrentGmode = GetOemDRO(819) 'Get the current G0/G1 state
PlateThickness = GetUserDRO(1151) 'Z-plate thickness DRO

If GetOemLed (825)=0 Then 'Check to see if the probe is already grounded or faulty
DoOEMButton (1010) 'zero the Z axis so the probe move will start from here
Code "G4 P2" ' this delay gives me time to get from computer to hold probe in place
Code "G90 G31 Z" &DownStroke &" F" &DownFeedRate 'probing move
While IsMoving() 'wait while it happens
Wend
ZProbePos = GetVar(2002) 'get the axact point the probe was hit
If Abs(ZprobePos) <= Abs(DownStroke)-0.1 Then 'Check if the probe has been found
Code "G0 Z" &ZProbePos 'go back to that point, always a very small amount of overrun
While IsMoving ()
Wend
Call SetDro (2, PlateThickness) 'set the Z axis DRO to whatever is set as plate thickness
Code "G4 P0.25" 'Pause for Dro to update.
Code "G1 Z" &PlateThickness + RetractStroke &" F" &RetractFeedRate 'retract
While IsMoving ()
Wend
Code "(Z axis is now zeroed)" 'puts this message in the status bar   
Else
Code "G0 Z0" 'retract to start pos
While IsMoving ()
Wend
Code "(Z-Plate not found, check connection or stroke and try again)" 'puts this message in the status bar
End If
Else
Code "(Z-Plate is grounded, check connection and try again)" 'this goes in the status bar if aplicable
End If
Code "F" &CurrentFeed 'Returns to prior feed rate
If CurrentAbsInc = 0 Then 'if G91 was in effect before then return to it
Code "G91"
End If
If CurrentGMode = 0 Then 'if G0 was in effect before then return to it
Code "G0"
End If
Exit Sub

https://www.machsupport.com/forum/index ... ic=27288.0


For the original macro, i believe this part of the code is wrong:

Code "G1 Z0"& Probepos

Also

If StopZMove=0 Then

is not required as there should have in my opinion been an Exit Sub at the end of the previous If statement.

I can fix the original macro but not quite now, maybe over the weekend.

[foxfly]

The problem is not the macro because with the parallel port it always worked.
I can try yours but tell me where to set the thickness of the block.

[Robertspark]

Its not my macro, I posted the link below my previous post.

[ger21]

I think it's still wrong.
Change

Code: Select all

Code "G1 Z0" & Probepos

to

Code: Select all

Code "G1 Z" & Probepos

and see if it helps?

Try getting rid of this line for testing.

Code: Select all

Code"G1 F4000 Z"&ZSal

The macro should end with the tool on your block, and the DRO reading 49.75. It should do this every time.

[foxfly]

Ok I modified the macro but the problem remains.
The first touch is wrong about 6/10 after it is correct, I added a condenser and now the first touch is wrong by about 4/10.
Maybe it's an electrical problem?