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50 in/min but no faster
« on: June 22, 2006, 11:07:54 AM »
Hi,
I am having a problem with my cnc macnine, I bought a macnine from K2cnc and I am trying to tune it so I can machine faster with out missing steps. I have no problems cutting at 40 to 50 in/min but if I go any faster it messes up and looses its place. Other problems I have been having is when it goes from G1 to G0 it looses it place more often. For example I was finishing a sign and profiling out the outside shape and it was at last pass I was about .5 deep and it was to rapid up to Z+.5 and it only made it about .05 up from the bottom and it took off to X0Y0 right through my finished part.doh!
When I bought the machine I was under the impression that it could cut at feeds of 120 in/min, I don't want to talk bad about the guys from k2 because they have been really helpful in the past but I though it might be worth asking a question in a forum that is dedicated to helping people with these problems. 
I am new to all of this and am not familiar with the terminology so who ever replies to this post must have a lot patience with me and be very descriptive. :P
Also,
I would like to try Mach 3 but I haven't even got my machine running right with Mach 2 so mabe I can try that at a later time, unless we can try to fix my problems using Mach 3.
Thanks,
Greg
method13
"Ideas have consequence" Ravi Zaccharias

Offline ger21

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Re: 50 in/min but no faster
« Reply #1 on: June 22, 2006, 01:09:24 PM »
Try lowering your acceleration by 1/2 and se if that helps. Also, what drives are you using, what motors, what size power supply, what leadscrews... will all help. What size machine, too.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: 50 in/min but no faster
« Reply #2 on: June 22, 2006, 01:57:17 PM »
Mach3 has less phase jitter than mach2... So you should get better speed out of mach3 :)

Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com
Re: 50 in/min but no faster
« Reply #3 on: June 22, 2006, 06:08:09 PM »
Hi,
Here are the details of my machine:
-Superstep Nema 23, 276 oz/in 2.8a 1.1ohm  1.8 degree stepper on all three axis.
-KERK Brand Anti-Backlash Nuts,  0.1 pitch lead screws.
-Direct drive coupling /w 2000 full steps/in, Made of 6061 Aluminum and Delran.
-4 linear ball bearings on each axes,Harden precision shafts.
-Stepper Controller Standard 3 Axis,Servo Motors with feedback encoders.
  Gecko Drives - Wired for Step/Dir signals from Printer/Parallel Port -
 Fully enclosed control box and pre wired for Parallel Interface
 110 watts power supply. 24VDC unregulated (~30V) 8 Amps.
 5 watt power input wire from 1 computer USB port.
 Power Cord - Fuse - E-Stop.
Is there more you can tell me with this info?
I plan on downloading Mach 3 and giving it a try.

Thanks,
Greg
         
"Ideas have consequence" Ravi Zaccharias
Re: 50 in/min but no faster
« Reply #4 on: June 22, 2006, 06:14:00 PM »
This is a picture of the mistake that I was talking about
« Last Edit: June 22, 2006, 06:16:26 PM by method13 »
"Ideas have consequence" Ravi Zaccharias

Offline zealous

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Re: 50 in/min but no faster
« Reply #5 on: June 22, 2006, 06:18:35 PM »
Method13,

I've posted a XML file for the K2 39X25 here:
http://machsupport.com/forum/index.php?board=7.0

I've also made a screen set that will work very well with the K2CNC and Mach 3
http://machsupport.com/forum/index.php?topic=602.0

One of my machines that I have is the K2 39X25 same set up as you. I'm getting around 150-200 IPM with 0.002 accuracy. Let me know if the setup file gives you these speeds.
« Last Edit: June 22, 2006, 06:35:19 PM by zealouse »

Offline zealous

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Re: 50 in/min but no faster
« Reply #6 on: June 22, 2006, 06:29:35 PM »
 looks like your setup is a little diffrent from mine. Did you upgrade to the "Hi-Tolerance Ball screws of .001 backlash tolerance"







Footprint with the motors 54" x 30" x 26"

Travel or Cutting dimension:
X-39" Y-24.5" Z-5" 

Pulley

Ratio is 2:1 on X and Y
Pulley made of Aluminum 

Frame Features:

Structure is CNC machined 6061 aluminum and extrusions
6061 Billet Machined Aluminum
X and Y Axis uses 20mm THK style linear rails/blocks (4 Blocks for X and 2 for Y) 

Z Axis Details:

5" Travel comes with Linear Rigid Rails and Hi-Tolerance Ball screw of .001 Tolerance 
Servo Controller Details:

3 to 4 Servo Motors with feedback encoders.
Geckodrive G320 servo controller
Wired for Step/Dir signals from Printer/Parallel Port
Fully enclosed control box and prewired for Parallel Interface
110 (std.) or 220 (request) watts power supply. 24VDC unregulated (~30V) 8 Amps.
5 watt power input wire from 1 computer USB port.

Linear Motion of X and Y Axis:

Rigid Rails
Hi-Tolerance Ball screws of .001 backlash tolerance available( bearing house has a plastic dust cover )

Ballscrews .001" backlas tolerance.

305 oz/in Servo.

2:1 Pulley ratio.

Re: 50 in/min but no faster
« Reply #7 on: June 22, 2006, 07:33:07 PM »
Sounds like you have a smaller servo system... 30V is not a very high voltage for a servo system, did you make the drive system or did it come with the router?
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com

Offline ger21

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Re: 50 in/min but no faster
« Reply #8 on: June 22, 2006, 07:45:53 PM »
He mentioned steppers, then said servos. Which is it? Servos shouldn't miss steps, the drives should fault and stop.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: 50 in/min but no faster
« Reply #9 on: June 22, 2006, 10:12:30 PM »
Hi,
Sorry I was cutting and pasting from their website, they are steppers not servos.  I bought the drive system, I went with a cheaper system to keep the cost down.  I have a KT-2514 with the regular lead screw it says it max feed is 150 ipm.  My upgrades include the high torque steppers and 5" in the Z instead of the regular 3".
Another question I have is how well does the thread cutting program work in Mach2/3, I haven't tried the wizard can you make any thread? or just the known ones?
Regards,
Greg
"Ideas have consequence" Ravi Zaccharias