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Messages - BR549

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761
General Mach Discussion / Re: Stop CV issues...
« on: September 17, 2015, 12:06:39 AM »
Reply #19

"" The main issue is i think that i done even know what a PM45 is capable of when it comes to internal corner quality, i know it can't be tighter than the radius of the flame but its difficult to know when you can't see what other users are happy with Wink I may be chasing the impossible. ""

You can cut as tight an inside corner as the width of the kerf. That leaves the radius of the kerf as the squarest corner you can cut. It is NO different than with a router or mill.

(;-) TP

(;-) TP

762
General Mach Discussion / Re: Stop CV issues...
« on: September 15, 2015, 06:07:21 PM »
Dave it is NOT an issue with the PM45 it is a  Machine design issue. You accel is too slow . Have you tried raising the acell rate until you get skipping of steps  then back it up untill it stops skippinging steps.  THAT is the only way to know the upper limit of the setting.

AND it that is still not enougt THEN you redesign the drives/motors /power supply to a better combination that WILL let you get to where you need to be.


763
General Mach Discussion / Re: Stop CV issues...
« on: September 13, 2015, 05:00:31 PM »
Dave what version of Mach3 are you running ???  IF the problem goes away when you put the CV back to normal then there is your answer , leave teh CV alone and work on other areas for improvement.  IF you are having rounding problems at those speeds then you need to rethink your settings or motors/drives or gantry design.   (;-)

(;-) TP

764
General Mach Discussion / Re: Stop CV issues...
« on: September 13, 2015, 04:26:51 PM »
OK are ALL the plates the same way ??  I can not see enough kerf detail to tell IF it was coming into the arc or just coming out of the arc ? Which was it. I see 2 defects.

Both appear to be a stall of motion ??  . Does it do the same thing if you set the CV back to box stock settings ?.   never see that here so it appears to be a local event. are you using the LPT version or other ??  What THC ??  Have you tried with the THC off ?? 

Have you reversed the motion to see IF it is an arc direction  problem ? 


(;-) TP

765
General Mach Discussion / Re: Stop CV issues...
« on: September 13, 2015, 01:12:59 PM »
Dave, (;-) It would seem you have an accel issue IF you are getting corner rounding. Plasma depends on a constant as possible cutting rate . Turning OFF CV anywhere defeats the purpose of CV.  I plasma cut just about everyday from 28ga up to 3/4",steel and  aluminum.

A lot of what you are talking about in corners is a THC problem where it is NOT holding the height as it slows down. THAT is a setting you need to play with. Start adjusting the anti dive/corner dive in Mach3.  IF it is to much reduction in vel before it locks then you get a arc that is to low and THAT will angle the kerf . You want the anti dive to lock out before it effects cut quality.

Another issue is using the correct combination of Nozzle, Sheild. air pressure, amp settings, DRY AIR.  This are very important to cut quality as well. Get one part off and the quality goes down the tube.  

with Plasma a LOT can be said out the quality of the Cut file. You are much better of with radiused  corners where ever possible. A sharp intentional corner makes it HARDER for the machine to maintain a constant cutting speed(almost impossible) without rounding. Accel is king with Plasma cutting and well as a very lightweight rigid gantry. Motros are calculated for max acell properties (low inertia High torque) THEN comes speed. Most times steppers have limited RANGE of operational speed where as Servos have a much wider RPM band they can work in.

THCs are another can of worms for most DIY users .  BUT that is a different chapter in the " So you want to be a plasma cutter book ". (;-)

NOW IF your control cannot do transitional changes in Gcode without a HESITATION then you have a Controller problem.  There ARE controllers that do not have that problem. Another chapter in the book.  The trajectory planner has to be top notch and very much in control without hesitations in execution.



I use the STANDARD Mach3 CV with NO adjustments at all. JUST like it comes out of the box and it cuts fine detail very well here. I do a LOT of artsy stuff where DETAIL is an issue.  NOW that siad I also use an alternative cutting speed settings for the very thin stuf <18ga . I am not interested in trying to cut above 200 IPM . There is ALWAYS an alternative cutting solutions to high speed cutting, you just have to find it

You are trying to solve a mechanical issue through software control (;-).

766
General Mach Discussion / Re: Stop CV issues...
« on: September 13, 2015, 01:15:26 AM »
What are you trying to improve about your cuts ?? Rounding ?? 

(;-) TP

767
AHHHHH  I see , You already HAVE the Code Segments You just need a way to assemble a list of them and maybe apply a fixture offset to each segment. THEN it would be 1 long program for the router to run.

Is that correct ?  Is so I already have something close to that. I use it for plasma work to assemble a JOB which may be 10-12 different elements with offsets(G54-G*********) to place each segment where it belongs. That way I can cut an entire sheet full of parts un attended. Then just toss the file when done as it only applies to that particular group of elements ( one time job with NO cad cam ).

HOW many different Files do you use PER JOB ??  What needs to be applied to a file to place it correctly ??

IF you can, email me a couple of your simple files so I can take a look at them for structure.

This can be done on a PAGE inside of MAch3 that way as you add each segment you can SEE it added into the toolpath on screen. That way you can make SURE it is correct. IF not undo and adjust it until it works .




(;-) TP

768
General Mach Discussion / Re: Why Is this happening?
« on: September 09, 2015, 05:05:37 PM »
First I would NOT use the A axis for a turrent . It has special features that allow it to radius sync to the XYZ motion. I would use one of the other axis B C.  You also need to start with a more normal setup I would start with VEL =200 and acel =20 as a test. THEN run the code and see how it responds.

ONCE you get it running smooth THEN you can play to find max vel and accel settings.

You could also be having trouble with the POKEYS ??

Just a thought, (;-)

769
General Mach Discussion / Re: Why Is this happening?
« on: September 08, 2015, 07:02:35 PM »
When mach 3 first loads up the feerate is set to zero.That is a safety feature. Try adding in a Fcall in the initiation string. Something like F100.  The reason it is slow when you come out of config IS mach3 resets and that sets the Feedrate back to ZERO again (;-).

IF putting a f100 in the initiation string does not help then FORCE the Fcall it your macro by making a call.  Code"F900" put it in before any action code, right after the last DIM call

Code"F900"
While Ismoving()
Wend








770
I understood exactly what you were referring too (;-). There is NOTHING simple about what you want to do. I do parametric conditional SUB programming all the time for FAMILIES of parts where as the PART is defined by the required parameter (options). It can take 100's of hours to create the master CODE. After that it is as simple as inputting a new #var to change what you are creating on the machine.

You may want to take a look at BoardCad.  

(;-) TP

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