Author Topic: DDCSV1.1 4 Axis controller  (Read 63253 times)

Offline blades

  • Jr. Member
  • **
  • Posts: 7
  • Country: us
Re: DDCSV1.1 4 Axis controller
« Reply #625 on: July 01, 2017, 07:57:16 PM »
A thousand thank-yous, Benedikt!  :beer:

Oh, another question: do you know of any way to take the PWM output of 0-10v and drop it to 0-5v, and still maintain a true PWM variable output? My laser will take 0-5v pwm input. I already had to have it repaired by feeding it from the 0-10v output from the DDCSV1.1
I thought about hooking up a 5v voltage regulator to it, but that would merely clip the upper 5v signal and give undesired results.
Bill

- No best but better

Offline awemawson

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 5359
  • Country: gb
  • East Sussex, UK
Re: DDCSV1.1 4 Axis controller
« Reply #626 on: July 02, 2017, 01:37:08 AM »
Simple op amp with feedback ratio set to amplification of 0.5

Andrew Mawson
East Sussex

Offline blades

  • Jr. Member
  • **
  • Posts: 7
  • Country: us
Re: DDCSV1.1 4 Axis controller
« Reply #627 on: July 02, 2017, 07:28:58 AM »
Simple op amp with feedback ratio set to amplification of 0.5

Sounds like a great idea, I will look into that. Thank you!
Bill

- No best but better

Offline C6MFG

  • Jr. Member
  • **
  • Posts: 5
Re: DDCSV1.1 4 Axis controller
« Reply #628 on: July 06, 2017, 11:27:50 PM »
Happy to discover the DDCSV1.1 and this forum!  I read through all the pages but have not been able to find or missed if there was ever a way to modify it to Imperial/Inches?  Is that an option with Pandora?

Thanks

Jason

Offline Benedikt M.

  • Full Member
  • ***
  • Posts: 154
  • Country: de
    • My website
Re: DDCSV1.1 4 Axis controller
« Reply #629 on: July 07, 2017, 01:51:13 AM »
Happy to discover the DDCSV1.1 and this forum!  I read through all the pages but have not been able to find or missed if there was ever a way to modify it to Imperial/Inches?  Is that an option with Pandora?

Thanks

Jason
Hi, Jason!

Glad you found it useful.
Inches is a very high priority right now.
Our rewrite will have inches from the start on, but I am currently working on adding working inches to the original firmware too.
So to answer your question, not now but soon.
I'll keep you all updated on the progress.

Best regards,
Benedikt

Offline C6MFG

  • Jr. Member
  • **
  • Posts: 5
Re: DDCSV1.1 4 Axis controller
« Reply #630 on: July 07, 2017, 09:46:05 AM »
Thanks for the quick reply Benedikt!  Glad to hear that it will soon be resolved.  I already ordered my controller and am very excited to use it....could be the perfect answer for some of my small CNC retrofited machines.

Jason

Offline C6MFG

  • Jr. Member
  • **
  • Posts: 5
Re: DDCSV1.1 4 Axis controller
« Reply #631 on: July 13, 2017, 04:13:23 PM »
Will Pandora allow the controller to be used on a lathe and support threading?  Just converted a mini lathe and I am currently using Mach 3 but was looking at swapping to linuxcnc for it .....until recently.

Jason

Offline C6MFG

  • Jr. Member
  • **
  • Posts: 5
Re: DDCSV1.1 4 Axis controller
« Reply #632 on: July 13, 2017, 06:29:32 PM »
Just showed up! :)

Jason

Offline aolney

  • Jr. Member
  • **
  • Posts: 8
Re: DDCSV1.1 4 Axis controller
« Reply #633 on: July 14, 2017, 12:46:44 AM »
I am under the impression from John Stevenson's comments that because there is no support for a spindle encoder that lathe threading will not work. I think that there is a $600 controller that will work, and probably be easier to get running than Linuxcnc.
Andy

Offline C6MFG

  • Jr. Member
  • **
  • Posts: 5
Re: DDCSV1.1 4 Axis controller
« Reply #634 on: July 14, 2017, 10:04:34 AM »
Andy,

Oh well...Thanks for the info!

Jason

Offline blades

  • Jr. Member
  • **
  • Posts: 7
  • Country: us
Re: DDCSV1.1 4 Axis controller
« Reply #635 on: July 17, 2017, 05:30:58 PM »
Ok, I'm about ready to take a hammer to this controller! Per my previous post, I was having trouble with my configuration because my G540 runs in 10x microstepping by default, and cannot be changed. This forced my to use a Z step setting number of 24,000 steps-per-inch (I'm running, or trying to run in inch mode). Max setting is supposed to be not over 10,000. At this setting, my Z-axis just hummed in program running mode, such as when trying to home. When I set this down to a lower number (12,000), it worked perfectly other than being off by 50%. So, I replaced the G540 with some TB6600 motor drivers where I can set microstepping. It was working perfect again on X & Y. I now have Z step setting @ 2400 with the new motor driver (no microstepping), and it's doing the same thing again! Motor won't even move in manual mode unless I drop the Z number to something well below the 2400 I need it to be.
WHAT THE HECK IS GOING ON WITH THIS STUPID THING??  :doh:
It didn't like 24,000 with the G540, and now it doesn't like 2400 with the TB6600 drivers! There is nothing wrong mechanically with the Z axis, it runs very smooth when I set an artificially low step number.

« Last Edit: July 17, 2017, 06:35:20 PM by blades »
Bill

- No best but better

Offline PPRINT

  • Jr. Member
  • **
  • Posts: 45
  • Country: us
Re: DDCSV1.1 4 Axis controller
« Reply #636 on: July 17, 2017, 08:15:44 PM »
Bill, I'm sorry the control setup is giving you fits.  This sort of thing stresses me to no end so I am empathetic to those going through it.

I'm not sure if I will be able to do anything to help you, but with some basic information I might be able to come up with some things that might point you in the right direction.

I'm a ground level sort of guy, so I have to start at square one when I solve problems with my projects.  Can you post the step angle of the motors you are using , the pitch diameter of your pulleys, and the pitch of your z-axis screw please.

Rob

 
The afternoon knows what the morning never suspected.

Offline blades

  • Jr. Member
  • **
  • Posts: 7
  • Country: us
Re: DDCSV1.1 4 Axis controller
« Reply #637 on: July 17, 2017, 08:34:26 PM »
Hey Rob, I truly appreciate any help at all!
The motors are pretty basic, standard NEMA 23 motors. 1.8 deg/step.
I'm not sure of the actual PD of the pulleys, but it's a 1:1 belt drive with 20-tooth pulleys on a 3mm pitch belt, to a 12 TPI lead screw (basically a 1:1 drive to the lead screw). The driver is set up with no microstepping.

The X & Y run on 20-tooth pulleys on a 3mm pitch belt. They work perfectly fine.

I also tested a different motor when I had the G540 hooked up, and got identical results, so it's not a motor issue.
Bill

- No best but better

Offline PPRINT

  • Jr. Member
  • **
  • Posts: 45
  • Country: us
Re: DDCSV1.1 4 Axis controller
« Reply #638 on: July 18, 2017, 08:09:38 AM »
Bill, as you already know your math is correct on the steps.

Have you worked out parameter #416 which is "the time between DIR and pulse" and #417 which is "the width of the pulse signal"? I know in my case these two parameters took a bit of work to get correct just to get motion with the MPG.

I also had to futz with the start and stop  acceleration for smooth movement.

I'm just shooting at stars here so be patient.  This is how I trouble shoot and with enough work it all gets resolved.

Rob


Edit...per the G540 manual parameters $416 and #417 should be set to 200.
The afternoon knows what the morning never suspected.

Offline blades

  • Jr. Member
  • **
  • Posts: 7
  • Country: us
Re: DDCSV1.1 4 Axis controller
« Reply #639 on: July 18, 2017, 05:11:21 PM »
 Hey Rob,

Thank you for that input. I had not really messed with those settings too much, but I think you have landed on something here.
I only had 416 (settings went from 416 to 418, with no 417). I set it to 200 (it was @ 300), but no change. So I adjusted #33 (motor start speed) to 20 (was @50), and it started working.

Now this has me wondering if I wasted all that time & $$ replacing the G540 with the new drivers. After all, it was working fine in manual jog mode. My assumption was that because I was so far beyond the 10,000 max step number that the controller wasn't happy with that.
Too bad I already cut off all the D-sub connectors I painstakingly soldered on for the G540.   :palm:
« Last Edit: July 18, 2017, 05:52:33 PM by blades »
Bill

- No best but better