On Friday 21 May 2010, Mark Wendt wrote:
>I've been doing some air cuts on the saw beveler the last couple of
>afternoons, using a pretty simple g code file called test_strip.ngc
>(attached). As soon as I hit the run button, a message window pops up
>saying "Program exceeds machine negative minimum on Axis Z" and gives me
>two options, to cancel the operation, or to continue despite.
>
>My modus operandi:
>
>Home the axes
>touch off the X and Z axes (only two I have on the machine) and enter
>those numbers as G55 values.
>
>Run program, message pops up, I hit continue, and the machine goes along
>on it's merry way, not exceeding or even coming close to the machine
>hard limits.
>
>I don't have soft limits set up currently. How is EMC determining that
>the the minimum is being exceeded? If I really am exceeding the minimum
>(according to EMC, what do I need to do to fix this so it doesn't happen
>- ie, ini file, g code, procedures getting ready to cut [am I doing
>something wrong with touch off, or not understanding how the G5x
>parameter really works?], or anything else I can't think of?).
>
>Attached is the test_strip.ngc, my ini file and emc.var.
>
>Thanks,
>Mark
Not part of the limits problem, but a slightly optimized Test_strip.ngc:
(My first attempt at writing G Code for bamboo fishin' poles)
G18 G20 G40 G49 G54 G80 G90 G94
G55 G0 X0 Z0 (are you sure Z=0 is correct for the start?)
G1 F40 X1 Z-.0640 (big taper first inch)
(G1 F40 X2 Z-.0662) (you are going in straight line at Z-.022 per " of X)
(G1 F40 X3 Z-.0684)
(G1 F40 X4 Z-.0706)
(G1 F40 X5 Z-.0728)
G1 F40 X6 Z-.0750 (here you start a -.030" taper)
(G1 F40 X7 Z-.0780)
(G1 F40 X8 Z-.0810)
G1 F40 X9 Z-.0840 (then straight for last 2 inches)
(G1 F40 X10 Z-.0840)
G1 F40 X11 Z-.0840
G55 G0 Z0 (I would go higher here for return clearance)
(G4 P2)
G55 G0 X0
M2
I suspect you'll need to protect the fixtures although I don't recall if you
said how you are holding the strips.
Some video would be educational to us. ;-)
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Substitutions never taste right
-- Murphy's Food Laws n�6
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