How to Increase Speed with Mesa and EMC

[TZak]

I have finally got my machine up and running.

I am using a mesa 5i20 card and emc2 2.2.3

I have managed to tune the servos to the best of my ability however I would like to have the machine move faster for rapids and overall performance. It seems as though the maxium vecocity I get up to is 60ipm. At least that what the maxium value displayed in Axis when i run programs.

I would like to increase this speed however when I cange the velocity values I get following errors.

I wanted to find out if anyone knows which setting I should be changing. I have included my ini file so hopefully someone can shed some light on increasing this speed.

Any help would be appreciated.

Thanks

[Zig]

I too am seeing following error flag being raised.

from what litle i understand the software is being asked to execute a path with a given following error.

There are two settings relating to following error and they are defined in AXIS_n definitions as follows

FERROR = 0.020
MIN_FERROR = 0.01

FERROR is applicable to high speed movements and MIN_FERROR to low speed coordinated movements.

try FERROR = 0.055 or even larger


You have set AXIS_0

MAX_VELOCITY = 1.0
MAX_ACCELERATION = 10.0

and AXIS_1

MAX_VELOCITY = 1.0
MAX_ACCELERATION = 5.0


At the same time TRAJ trajectory planner is set to


DEFAULT_VELOCITY = 1.0
MAX_VELOCITY = 1.0
DEFAULT_ACCELERATION = 3.0
MAX_ACCELERATION = 10.0



try something much larger in maximum velocity say

MAX_VELOCITY = 3.0

And MAX_ACCELERATION similarly larger in the trajectory planner than the correspnding setting for the AXES say

MAX_ACCELERATION = 15

I hope my understanding is correct, and applicable to Your set up as I am using simple stepper control driving a BLDC in a closed loop config via parallel port.

Almost forgot...

In the EMCMOT section you have

BASE_PERIOD = 50000

This sugests that the latency of your PC is rather mediocre.

If you have not done so already do run latency-test and post the results.

I would think that if You want better top end performance BASE_PERIOD needs to be about half of what you have.
However since this parameter is influenced by the PC motherboard latency-test is the only arbiter of what it ( BASE_PERIOD) can be for reliable not fast operation.


Hope this helps

Zig