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Messages - BR549

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201
General Mach Discussion / Re: THC moves on the Z axis...
« on: February 13, 2016, 12:20:22 PM »
The pierce divot is ONLY an issue cutting open lines where you cannot use a leadin (;-). With a closed shape and a leadin who cares about a divot ? it falls out anyway (;-)

202
General Mach Discussion / Re: THC moves on the Z axis...
« on: February 13, 2016, 12:04:52 PM »
ESS verses  teh LPT. NOW you are talking apples and oranges As teh ESS has to handle teh THC internally in its on way.  

When you retune for best performance you normally leave teh VEL where it was because it was stable at that point. Then you run teh ACCel up to teh fail point and back it down 25% and retest teh THC function.

IF you are chasing teh divot on pierce. You have several things to work with . Normally nothing can move unitl you get teh Arkok signal. Then normally you move DOWN in Z to teh cut height. You can mkae that a GO move instead of a G1 OR speed up teh G1 move to maximum.

OR seeing how you are cutting thin guage metal simple make teh pierce height eh same as cut height and eliminate teh Move to CH move all together. That way as soon as teh Arcok signal is seen XY are moving.

For ME here I override teh Arkok signal ( turn it ON all teh time) so as soon as teh torch gets teh fire signal teh torch is moving. That give teh ark no time to burn a divot.  NOW that does not work well with thicker metals as you DO need teh dwell to fully pierce. But with thinner sheets the ark start and pierce completion are almost instant.


203
General Mach Discussion / Re: Educational Sources???
« on: February 13, 2016, 11:46:30 AM »
There is a decent reference manual on Gcode right here on this site.  http://www.machsupport.com/forum/index.php/topic,24580.0.html

Several of us have discussed building a ref library here on teh site BUT that can get complicated.  At best I think we can only put together  a list of LINKS to the works.

The problems with that is LINKS come and go so some of the references may disappear over time.

204
General Mach Discussion / Re: THC moves on the Z axis...
« on: February 13, 2016, 11:38:35 AM »
Rememeber that you are moving the Z under THC control in VERY small moves so having a high VEL is useless as you are NEVER going to get there with a normal cutting move.

On the other hand you are using FAST Accel with EVERY move (;-) so it really becomes the  more important element with plasma.


205
General Mach Discussion / Re: THC moves on the Z axis...
« on: February 13, 2016, 10:54:52 AM »
What you are trying to acheive is lowering teh normal RPM range of teh z to push it back down into teh higher torque range.  Doing that you can acheive faster accel before loosing control of the stepper.

If neccessary you can lower teh G28.1 speed in Homing Config.

Always test and tune in G00 mode Then rerun test under Gcode/THC control to verify it all.  The first signs you run into with teh Tuning Z is Z will start to loose steps IF you have gone too high.  On teh other end IF you get too fast for teh THC you will see Z occilations .

(;-) TP


206
General Mach Discussion / Re: Mach3 VB Script Help
« on: February 12, 2016, 10:15:04 PM »
Not quite fixed yet (;-) You are getting better BUT you are missing a couple of critical things (;-) that are going to bite you when you are not looking .

It would seem that you are always around X0Y0 when you start. Move far away from there and test your routine an you may see the problem show up.

You want your routine to be able to run from anywhere and still work and be accurate.

With you latest example Goto Y0 X-10 and then RUN your routine. Tell me what happens on the very first probe move (;-).

Also just a note XC and Xc in CB is the exact same thing. CB is NOT case sensitive.

Also you are adjusting your values to fit the particular instance (;-) . IF you are at a different position it may or may not work and MAY break your probe.

Also you need to get that thought of a % of a move out of your head it is NOT your friend in this case. (;-)

One more note, It is best to be at LEAST .050" from teh trip point when you call teh G31 function into play.

(;-) You still do not have a grip on Inc(G91) and Abs (G90)

(;-) TP

207
General Mach Discussion / Re: Mach3 VB Script Help
« on: February 12, 2016, 09:41:46 AM »
WHy does your X1*90 move not work ???  Easy you are trying to do an inc move with an abs position value NOT an inc value.

Take this example. Lets move to teh far side of the table so the example will be dramatic. Teh hole you are probing is 1" diam

Your first leg of the probe doing a center of circle trips at X95. So that makes your X 1 = 95.0000   OK   X3 = (95.0000 * .90) = 85.5

Your routine is STILL in INC mode so when you go to Code"G0 X "& X3 it will MOVE right 85.5 "  AND you just broke your probe.

HAD you actually been testing as you created each line you would have seen this right off teh bat (;-)  .

Also I did not finish the Formula to find center of a circle for a reason. It was to make you think about what you were creating.

There are 2 basic ways to work teh formula.  From an  INC approach OR  ABS approach. THAT would be your choice . But each takes a different way of doing it.


You are missing a LARGE block of basic knowledge for using Gcode. Trying to create a high end macro WITHOUT that knowledge is like trying to do Algebra without understanding the basic rules of Algebra. It will not make any sense.

(;-) TP

208
General Mach Discussion / Re: Mach3 VB Script Help
« on: February 11, 2016, 09:44:00 PM »
OK Remember when I mentioned that teh #2000 is an ABS position value ???   I was not kidding(;-)  The value you are getting could be a very high value NUMBER wise.  Without warping your brain with the math it is easier to make teh backoff move in INC  .050 will always be .050.   X1*.90 could end up being anything depending on WHERE you were on the table.

I am thinking you do not fully understand Abs and Inc terms in Gcode ?

IF you are in G20 mode then you ARE in inch mode.

Not quite sure what you mean by Machine jitters BUT if Sleep() cures it you have other problems.

Also rememeber what Stirling said START with simply moves , perfect them then add another section of code , test tune and repeat. You are trying to do it all at one time without fuilly understanding what it is doing. Kaos at best.

(;-) TP

209
General Mach Discussion / Re: Mach3 VB Script Help
« on: February 11, 2016, 07:59:24 PM »
Is your Machine setup in Inches or MM ??  Look on the main RUN screen top right that is the modal line Do you see a G20 or a G21 listed ??

(;-) TP


210
General Mach Discussion / Re: Mach3 VB Script Help
« on: February 11, 2016, 07:51:50 PM »
OK I gotta ask (;-) WHAT is the X1*.90 move about ?

(;-) TP

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