[Harryman]

I'm using an electronic tool touch off setter so I can maintain an accurate local Z zero when changing tools on my benchtop mill. It's wired into WinCnc and functions as a switch.

Here's the scenario I'd like to have happen. I have a Z zero position I use for my rotary axis a known distance (-28.65mm) above the top of the toolsetter. After a tool change, I'd like to touch off on the toolsetter and reset local Z at -28.65 and return to local X0Y0 so I'm ready to run the next program.

I can send the spindle to the toolsetter, manually touch off and trip the switch, G92 Z-28.65 and it works fine.

If I run this:

G53 Z0 [Lift Z Head]
G53 X276 Y125 [Move to XY position of tool measure switch]
L91 G0 Z-100 [Move down the rapid distance]
L91 G1 Z-250 M28 F20 G31 [Move down to tool switch]
g92 z-28.65 [set LZ at TOOL SWITCH HEIGHT]
G53 Z0 [Lift Z Head]
G0X0Y0 [RETURN TO LOCAL XY ZEROS]

It runs but doesn't set a new Z position, Z zero remains whatever my previous local Z zero was.

What am I missing?

Thanks,

Harry

[Harryman]

Got this to work, it might not be totally right, but it's a start:


G53 Z0 [Lift Z Head]
G53 X276 Y125 [Move to XY position of tool measure switch]
L91 G0 Z-98 [Move down the rapid distance]
L91 G1 Z-15 M28 F20 G31 [Move down to tool switch]
G92 Z-28.65 [set LZ at TOOL SWITCH HEIGHT]
L90 G0Z65 F800 [Lift Z Head AND RESTORE FEEDRATE]
L92Z [CANCEL G92 RESTORE]
L90 G0X0Y0 [RETURN TO LOCAL XY ZEROS]

More info here:http://www.cnczone.com/forums/showthread.php?t=70366

[cabnet636]

harry i have several macros for the (as we call it) "touchtop"

will be in shop today and will post for you later


jim

[cabnet636]

this is a touchtop mac which is placed in the ini file, it is in inches but i have used it over 8 months now i hold my aluminum pad up off the table and test, this will give time to abort if there is a problem!!

i can email the file so pm me if you want it

jim


l92 [Remember G92 Setting]
l91g1z-10f10m28g31 [Touch Distance]
l90g92 z.503 [Enter Thickness of Switch Plate]
l92

l90g0 z.75 [Clearence Height]
l91g1z0f50 [Set Default Feedrate]
g0

[Harryman]

Thanks Jim! I'll check it out.

I can just copy it from here so no need to email it to me. Thanks for the offer though.

Harry