confused about velocity settings in the INI

  • Aciera
  • Aciera's Avatar Topic Author
  • Offline
  • Administrator
  • Administrator
More
13 Jun 2020 08:58 - 13 Jun 2020 09:01 #171382 by Aciera
I have a bar loader configured as a U axis in a mill configuration using stepper motors. This u axis, unlike all other axis, is a direct drive rack and pinion. Because this feeder has a travel length of 4 meters I want to increase the G0 rapid velocity by about a factor of 10 without affecting the settings of the other axis.
Warning: Spoiler!


Now I got myself confused about all the different velocities and acceleration settings in the INI file.

So we have this in the DISPLAY section:


this in the TRAJ section


this in the AXIS section:


this in the JOINT section:


and this in the joint section that is actually for the hostmot2 stepgen


So my understanding is that in JOINT mode (so also for the homing process since there is no axis before the joint is homed) the settings in the JOINT section are relevant. After homing it is the AXIS section.
So then in the DISPLAY section we set the min/max values for the jog slider in the GUI and the TRAJ setting are for the motion planner.

So in order to increase the G0 velocity for the U-Axis only I should just be able to increase the settings in the U-AXIS section.
I tried that but it does not seem to make a difference. The U-AXIS still moves at about 25mm/s.

Because the machine is already in use I can't spend to much time fiddling with it. So I would like to have a somewhat clear understanding of what my approach should be.

So should I increase the TRAJ velocity and the JOINT and the AXIS for U? Should the settings in the JOINT and AXIS sections always be the same?

Thanks
Attachments:
Last edit: 13 Jun 2020 09:01 by Aciera.

Please Log in or Create an account to join the conversation.

More
13 Jun 2020 09:31 #171384 by bbsr_5a
Replied by bbsr_5a on topic confused about velocity settings in the INI
it will be a error if the AXIS and Joint settings are not the same

for UW the Values are also in Machine units

and ofcause in per second

Please Log in or Create an account to join the conversation.

  • tommylight
  • tommylight's Avatar
  • Away
  • Moderator
  • Moderator
More
13 Jun 2020 12:33 #171419 by tommylight
Replied by tommylight on topic confused about velocity settings in the INI
Display section = limits the slider velocity in the GUI
Traj section limits overall machine velocities
Per axis/joint section limit that axis/joint
I always set the display and traj section about 25 % more than any of the axis, so when i jog X and Y together it can reach both axis/joint speeds, without clipping them. When two axis move together, the distance travelled is longer than that of each axis.
So to increase the U axis speed, the display and traj have to also be raised.
The following user(s) said Thank You: Aciera

Please Log in or Create an account to join the conversation.

More
13 Jun 2020 13:18 #171435 by Mike_Eitel
Replied by Mike_Eitel on topic confused about velocity settings in the INI
In theorie you should set it to the square root of three. Ca 1.7
The following user(s) said Thank You: Aciera

Please Log in or Create an account to join the conversation.

More
13 Jun 2020 13:48 #171448 by bbsr_5a
Replied by bbsr_5a on topic confused about velocity settings in the INI
refering to his other post he managed it and got a running machine

Please Log in or Create an account to join the conversation.

  • Aciera
  • Aciera's Avatar Topic Author
  • Offline
  • Administrator
  • Administrator
More
13 Jun 2020 14:36 - 13 Jun 2020 14:38 #171459 by Aciera
Replied by Aciera on topic confused about velocity settings in the INI
So to be able to run the u-axis at 12000mm/min I would set
TRAJ and DISPLAY settings to 12000 x 1.25 = 16000 = 266
U-AXIS and JOINT to 12000 = 200

I'll try that.
Thanks

@bbsr_5a: Not sure what you are referring to.
Last edit: 13 Jun 2020 14:38 by Aciera.
The following user(s) said Thank You: tommylight

Please Log in or Create an account to join the conversation.

  • tommylight
  • tommylight's Avatar
  • Away
  • Moderator
  • Moderator
More
13 Jun 2020 14:38 #171460 by tommylight
Replied by tommylight on topic confused about velocity settings in the INI
Yup, that should do it.
The following user(s) said Thank You: Aciera

Please Log in or Create an account to join the conversation.

More
13 Jun 2020 21:07 #171492 by cmorley
Replied by cmorley on topic confused about velocity settings in the INI
'DISPLAY' is only for the gui setting for jogging.
Unless you need to jog the UW axis fast you don't need to change those setting.
The following user(s) said Thank You: tommylight, Aciera

Please Log in or Create an account to join the conversation.

Time to create page: 0.124 seconds
Powered by Kunena Forum