--- In mach1mach2cnc@..., "caudlet" <thom@t...> wrote:
--- In mach1mach2cnc@..., "morgtod" <todmorg@h...>
wrote:
Hi,
Does the thc function alter the initial 0 z height, if I set my
0,0,0 and start the file my torch raise 1" rapids to the pierce
point
and the thc starts, when I call my next g0 z1 do I return to the
initial 1" or do I go 1" up from the present thc offset.
P.S. The THC control greatly improved the quality of my cuts,
this
is
really a cool hardware, software combo.
Todd
The THC simple keeps the Z updated with the actual height. If you
have it on and start cutting, let's say at .125 above the material
and the THC moves the head up and down during the cut, that
distance
is added or subtracted from the initial .125. It's basically like a
jog during the cut. Let's say the last position of the head prior
to
your M05 (torch off) was .187 then that is the number stored in the
Z
height register and on the DRO. A move to 1.00 would be absolute
so
if the read was at .187 it would move the difference. In the end
the
head should end up 1.00 above the zero point (I use the material
surface as Z zero).
One strangness that I have noticed (Art refuses to believe me) is
that PRIOR to running any g-code, a G28.1 X1Y1 reference move
rapids
to 1,1 and moves at reference speed to the home switchs and stops
at
0,0...just like when you hit the manual axis reference buttons.
After you have run a g-code program the same exact command results
in
a rapid run to 1,1 a slow run to home and a rapid back to 1,1 with
the DRO on 1.000X 1.000Y. It has something to do with table
offsets
I think, but I just wish it was the same all of the time. I do not
put in G28.1 in the code since the result can be different.
At this point I could not live without my THC. I am cutting a lot
of
steel and just the saving of tips makes it worth the price.
Tom C.
Hi Tom,
Thanks for the explanation on the offset function. You are correct
about the g28.1 functioning oddly, if I do a G28.1z1 my torch rapids
to 1", slowly lowers to the switch opening, and stops. The second
time I run it, it will referance the switch and then return to 1",
just like you explained it. This is keeping me from using the g28.1,
but I would like to use it to maintain accurate pierce height. Once
this small problem is cleared up I think it will be smooth sailing
with the thc. Is is fun to watch the torch glide over uneven metal
and just hover at 1/16", its just like magic!
Todd
