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Messages - BR549

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391
General Mach Discussion / Re: Physical buttons for plasma
« on: January 27, 2016, 10:51:36 AM »
Robert you commented on teh lost steps. The probem with lost steps in Z is that Mach3 does not know it happened and THAT alters where it thinks Z actually is. Normall it makes it think the teh Z is HIGHER than it actually is so when the Torch head goes to cycle and the next cut it drives the torch into the metal.

NOW if teh Z motor had an encoder for position you could fix that via software and correct teh position before it caused a problem.

As to adjusting teh Torch parameters long ago I used small steppers attatached to teh Amp knob and to teh pressure regulator to adjust teh machine settings on the fly. The problem was EACH curve in teh toolpath required a different setting based on the dynamics of the curve. High end machines can calculate that on teh fly Mach3 would not stand a chance there, and did not (;-). It may be possible for Scam to do it in CaM BUT with all teh changes the Gcode would be horrible. AND you still would not get much improvent if any in cut quality.

You idea on speed changes is interesting BUT I don't think you will never get it to work at teh macropump level it s FAR to slow. You MAY be able to do it at teh Plugin level where you have access to a higher sampling rate and process speed.

But in reality what have you gained IF you never cut at Very HIGH SPEED or cut highly warped sheets .  Mosst of teh DIY tables I have seen are not rigid enough for high speed cutting. The high accel rates jerks the table around to much causing poor cut edges.

I emailed JIM as to the NEED for a different rs485 board and the first round of the conversation was all Standard HT sales GibberJab and totally talked around the need. (;-) I rephrased the question and tried again .

Worse case senario we hack into teh Motherboard and use a port sniffer to get the protocal then talk directly to it OR yous guys can develope a RTU modual to talk to it.

(;-) TP

392
General Mach Discussion / Re: Physical buttons for plasma
« on: January 27, 2016, 10:27:56 AM »
HI Ian, Sounds good to me (;-).  As to teh Z design the best solution I have seen was a very light very low inertia setup. It used linear rails and a small diam ballscrew 2TPI. The motor was as very low inertia servo drive.  IT was wickedly quick but if you turned off the machine the head would fall to the table. The frame was thin 4130 chromoly plate. It was built by one of the aircraft guys.

What always interested me was IF direct pulsing of the stepper to gain max accel and minimum time HOW is it they can do it WITH accel curve and go MUCH faster and quicker with an outside controller driving teh Z ?  

IF direct pulsing is the fastest possible way to move the motor HOW can it be done faster ???

(;-) TP

393
General Mach Discussion / Re: Physical buttons for plasma
« on: January 26, 2016, 08:03:21 PM »
HI Keith , The problem with trying to lower teh amps is teh nozzles are based on teh rated current to establish a high density arc. Teh shap of teh nozzle cone and teh air pressure help to compact teh arc into a much denser arc great for cutting. When you just lower the amps the arc can get weak and lazy. High end cutter can vary teh gas % and gas pressures and modify teh charectoristics of teh current to keep a dense arc going. Low end plasma units like we use it cannot do that so you basically just end up with a weaker lazy arc. AND that is not what you really want.

IF you think about it Plasma cutting depends on a constant velocity to cut best. It is just the nature of the beast. With low end cutting the best you can do is set your anti corner dive to come in early to lock the THC down and just let it run through teh corner(slowing down naturally ) then pick back up after the corner.  Trying to manipulate all teh other variables on the fly WHEN the plasma unit was never designed to USE those variables is a beast at best and normally does NOT show an improved cut.

You would better off spending time to optimize teh Aceeleration curve of teh machine rather than relying on magic monkey dust.  

Next thing to work on is seeing IF there is an alternate cut setting that works at a lower feedspeed where your machine can better deal with corners without slowing down as much( % wise) as with high speeds.  

Then work on your tool pathing to optimize it for sharp corners.

(;-) TP

394
General Mach Discussion / Re: Physical buttons for plasma
« on: January 26, 2016, 04:42:39 PM »
Hi Ian I agree with you (;-), the explaination I gave as a guess came about from a conversation I had with HT many years ago about their choice of Modbus.

Hiya Robert, Ok I see where you were heading GOOD idea.  Who you need to talk to is Jim Colt at HT USA. I will see what I can find out from him. I agree that an RTU version would be a BIG help or even a simple Serial version would be just fine as you are NOT accessing vary mANY variables inside of teh Plasma unit. Basically cut Amps and Air pressure.

A simple serial version may  save a LOT of overhead  over using Modbus  ?????? AND it may be that the unit actaully talks a form of serial  and they only use the Modbus board as a dependable noise free communication in a shop enviroment.

It may be that Mach3 could talk to teh unit directly across RS485.

(;-) TP


395
General Mach Discussion / Re: Physical buttons for plasma
« on: January 26, 2016, 08:20:02 AM »
iF you are talking about on the fly amp reduction I am not a big fan with low end air plasma as you do not gain anything from it without having all teh high end features of plasma. It is more of a sales gimic than anything at this level.

You will gain a LOT more by working on the mechanics of your machine rather than the gimics of your machine.

NOW HIgh end mixed gas variable flow machines are a different story BUT that is NOT what we are dealing with.

NOW why Modbus Ascii ?? I do not have a clue only a guess.  Ascii uses a CRC check of teh code to insue it is what it is. I GUESS they wanted that type of secure mode to talk to a high end machine and it just trickled down in technology. IT DOES make it a PAIN to work with for low end stuf.

Why make it even more complicated just program your COntroller to talk Ascii.  HT shows you how to use teh CRC check.

WHY would you want more than 1 com board for teh plasma ??? 


(;-) TP

396
VB and the development of wizards / Re: VB Script triggered by Gcode?
« on: January 25, 2016, 06:37:48 PM »
You would use teh macro editor to add to teh M6. Now that said you also need to make sure you have Tool changing turned on. It is on teh Gencofig page top left hand side. 

397
Tangent Corner / Re: Electro-Punch design
« on: January 25, 2016, 12:04:03 PM »
Looks good but you will have following problems with that  pin and cam setup.

Just a thought, (;-) TP

398
General Mach Discussion / Re: Help Can't get steppers to move!!!
« on: January 25, 2016, 11:30:06 AM »
HIYA Rich , Don't you just love it when they do everything but what you asked them to do (;-)

(;-) TP

399
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: January 25, 2016, 11:23:41 AM »
Jamie you were talking to one of the foremost experts on Mach3 turn on this site and all you can do is kick him in the teeth ??

Good Luck, (;-) TP

400
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: January 25, 2016, 10:47:46 AM »
Hiya Rich, I think you got your answer >:D

(;-) TP

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