Hello Guest it is August 23, 2019, 11:39:49 PM

Author Topic: Mach3 Problems - Rant!!  (Read 36923 times)

0 Members and 1 Guest are viewing this topic.

Offline Pinky

*
  •  48 48
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #90 on: June 13, 2011, 12:03:57 PM »
Hmmm not sure how to put this, but how does one get mach3 to run smoother when engraving?

For example, when engraving the letters "finest ten" in the picture above, the feed rate is set at 500mm/min, however in mach3 the feed rate keeps changing, usually well below 500mm/min as it goes along.

I can understand that it has to slow down here and there to take tight corners etc etc, but once again, when running this on a HAAS machine it's pretty much setting on 500mm/min the whole time.

On our current machine everything takes about 3 times longer to engrave since mach3 keeps dropping the feed rates well below what it should be.

Would smooth stepper perhaps make mach3 run more smooth feed rate wise?

Offline Hood

*
  •  25,849 25,849
  • Carnoustie, Scotland
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #91 on: June 13, 2011, 02:18:54 PM »
Sounds like it is due to the acceleration of your axis and not anything to do with Mach. If you have it in Exact Stop mode (G61) changing to Constant Velocity (G64) may help.

Hood

Offline Pinky

*
  •  48 48
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #92 on: June 13, 2011, 02:26:30 PM »
Howdy Hood,

It's definitely not in Exact Stop Mode, I've made 200% sure of that. Heck I've run it in exact stop mode just to see if it makes any difference, which is obviously doesn't, just a bit slower.

My accel/decel rate is 0.3 seconds, I've had it on 0.1 second but the machine starts sharking a bit, so I tuned it down a bit just in case.

It's currently on Velocity 10 000mm/min with accel/decel on 2000 mm/min, but still no real change in cutting time.

Any more suggestions would be greatly appreciated :)

Offline Hood

*
  •  25,849 25,849
  • Carnoustie, Scotland
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #93 on: June 13, 2011, 02:46:27 PM »
If your accel is 2,000mm/s/s then it should run well, I presume thats what you are meaning.
If you attach your xml and the code I will see what it runs like here and also see if I notice any issues.
Hood

Offline Pinky

*
  •  48 48
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #94 on: June 13, 2011, 02:51:41 PM »
Ah yes 2,000mm/s/s is correct.

Unfortunately I'm not at the machine at the moment, but will upload the code and xml tomorrow night for your much appreciated evaluation :)

Offline Pinky

*
  •  48 48
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #95 on: June 14, 2011, 03:39:05 AM »
Just spoken with our machine manufacturer and according to him our servo's are setup in Position Mode, which means all S Curve parameters are disabled.

Could this possibly be the reason for the slow down in feed rates?

Offline Hood

*
  •  25,849 25,849
  • Carnoustie, Scotland
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #96 on: June 14, 2011, 06:26:55 AM »
S curve will likely give smoother motion but whether it would give faster cutting I am unsure, cant really see how it would.

Hood

Offline Pinky

*
  •  48 48
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #97 on: June 14, 2011, 07:46:20 AM »
Greetings Hood,

I've just finished reading the topic on Tempest Planner, sounds very interesting!

Reckon I'll give that a try to see if it makes any difference seeing as though it makes use of S Curves.

Offline Hood

*
  •  25,849 25,849
  • Carnoustie, Scotland
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #98 on: June 14, 2011, 07:54:09 AM »
Lots of people seem to like Tempest because of the smoother accel instead of the On/Off type.
Hood

Offline Pinky

*
  •  48 48
    • View Profile
Re: Mach3 Problems - Rant!!
« Reply #99 on: June 15, 2011, 04:16:43 AM »
Haven't really gotten anywhere yet since the spindle which use to start up 75% of the time is now not starting up at all after they redid all the wiring.

It's really bizarre, the spindle switches on and the fan goes on, but it's not spinning.

Haven't forgotten about the code and xml file hood, just haven't been able to use the machine yet.