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Exact Stop G64
« on: May 08, 2006, 01:52:09 AM »
Everytime I run a program the feedrate tries to go back to zero between each line of code, thought this might have something to do with the 'exact stop' setting so went into the configuration setup and changed it to constant velocity and also added a G64 into the start of the code to see if this would solve the problem, unfortunately the feedrate still goes back to zero between each line of code so not sure where I've gone wrong.

Offline Graham Waterworth

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Re: Exact Stop G64
« Reply #1 on: May 08, 2006, 02:36:41 AM »
Is this on a lathe or a mill,

Graham.
Without engineers the world stops
Re: Exact Stop G64
« Reply #2 on: May 08, 2006, 05:04:17 AM »
Also please give us a small sample of your program and you XML file :)

Thanks
Brian
Fixing problems one post at a time ;)

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Re: Exact Stop G64
« Reply #3 on: May 08, 2006, 03:56:49 PM »
We are running a router and producing the G-code out of Edgecam

Here is a sample of the some of the code that we are running and I have attached the xml file:

G90G40G49
G64
T01(6mm slot cutter)
G54M06
S4000M03
G0X122.216Y46.985
G43Z5.0H01
G1X198.331Z-3.0F2000.0
X199.679Y46.278
G17G2X203.314Y44.229Z-3.0R69.124
G1X204.167Y44.284
G2X211.032Y44.752Z-3.0R424.022
X216.836Y45.151Z-3.0R531.251
X229.29Y46.014Z-3.0R1400.554
G1X233.022Y46.268
X235.882Y46.457
X239.406Y46.76
X239.863Y46.793
X242.701Y46.985
X258.439
Y45.057
X254.286Y44.746
X250.342Y44.476
X246.658Y44.215
G3X239.192Z-3.0Y43.734R337.065
G1X238.755Y43.697
X236.112Y43.465
X224.053Y42.658
G3X217.045Z-3.0Y42.158R751.665
X211.234Z-3.0Y41.759R535.447
X204.372Z-3.0Y41.291R422.046
G1X202.573Y41.175
X200.562Y42.37
G3X195.796Z-3.0Y44.9R95.655
G1X193.336Y46.061
X192.248Y46.546
X191.212Y46.985
X182.711
G2X185.701Y45.942Z-3.0R93.446
G1X187.915Y45.101
X188.952Y44.683
X189.982Y44.248
G2X193.251Y42.788Z-3.0R63.297
X196.892Y40.964Z-3.0R65.726
X200.474Y38.937Z-3.0R65.031


Any ideas would be greatly appreciated
thanks
shelley
Re: Exact Stop G64
« Reply #4 on: May 08, 2006, 10:09:33 PM »
try to retune your motors... They look like thay are not set right....
Fixing problems one post at a time ;)

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Re: Exact Stop G64
« Reply #5 on: May 09, 2006, 07:11:58 PM »
Have spent alot of time trying to retune the motors and trying to run it at different speeds,  but that hasn't fixed the problem..
We are able to get it run alot smoother by pulling the acceleration and velocity speeds in the motor tuning right back, but in doing this the machine is forced to run so slowly that the cutter is burning the wood. We are using Vexta drives and stepper motors and for the life of us can't get them to run efficiently and smoothly.

The feedrate itself, is still all over the show and during short arc movements the machine shakes and vibrates really violently. As it is trying to decelerate down to zero then accelerate back up to max feedrate in a short space of time.
We have been doing some feedrate tests and we can get it to work really well and smoothly on jog moves but as soon as you run g-code the feedrate accelerates and decelerates at the end of everyline went through and triple checked that constant velocity is set, but this seems to make no difference.

Almost feels as though I have ticked and unticked everything to exhaust all other possibilities and not sure what else I can do ???

Offline ART

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Re: Exact Stop G64
« Reply #6 on: May 09, 2006, 10:59:55 PM »
Hi:

  How abouyt the driver test run? Is it a clean waveform?? This sounds like *********ty pulse reponce. How does Drivertest.exe respond..

Thanks
Art
Re: Exact Stop G64
« Reply #7 on: May 09, 2006, 11:29:20 PM »
HAve run the driver test numerous times and keep getting the same result, so don't think it has anything to do with that.

The driver test run is showing:

Pulse per second in 25kh mode =23600 - 24800 or 22300 - 23200

CPU Speed= 1917

Apic timing constant= 4142

Interrupt used= 00

The waveform is pretty much flat with the occasional spike but no spike is over 5mm on the graph

Thanks
Shelley
Re: Exact Stop G64
« Reply #8 on: May 10, 2006, 12:25:13 AM »
Have also found that constant velocity holds when you are cutting arcs and circles but the feedrate fluctuates when cutting straight lines or point to  point code so when you have a series of short lines the feedrate accelerates up to max feedrate and decelerates to zero for every line causing the extreme shakes and shudders of the machine
Thanks
Shelley

Offline ART

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Re: Exact Stop G64
« Reply #9 on: May 10, 2006, 09:06:09 AM »
Shelly:

  The only way to get away from that is to have a  greater acceleration, Im told yours is 4? Thats pretty slow for a mm machine.. Hmm..
Try this as a test.

G1X5
G1X10
G1X20
G1X30

  Do those 4 lines execute with no slowdown inbetween?

Thanks
Art