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Topics - surfcnc

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SmoothStepper USB / Feedrate Overide
« on: April 02, 2012, 12:41:58 AM »
This is my first post into the forum, so hello to you all.

I have done a full days testing now and have been unable to resolve my CNC machine moving in a jerky fashion when using feedrate over ride using the ESS.
It pulses fast and slow, and appears to have to momentarily wait for information to buffer in.
I have tested the machine with gcode that runs at 2x times speed and it moves very smoothly.
The issue is not related to the actual speed the machine is moving, it is directly related to the use of feedrate overide.

General Details are
Device -  Ethernet Smoothstepper
Driver - ESS_V10da2
Mach 3  - development versions tested - Clean installs of R3.043.059 and R3.043.060
Network interfaces - fixed IP on both the ESS and the PC Ethernet Adapter
Firewall - both on with Mach3 and configurator exceptions for private and public networks and firewall switched of for both public and private networks
Screensets - none

Mach3 config...
General Config - Read ahead from 20- 200 lines
Motor Tuning - Motor Step and Dir Pulse from 0,0  to 5,5

ESS Plug in configuration
Max Frequency - typically 1 MHz but up up to 4MHz
Max Pulse Frequency - from 256KHz down to 36Khz
I have changed these values from very high to very low with no change in the movement.
Changed the setting "Number of Data Points Mach should Pre-calculate" from default 1023 to 2046 with no effect.

Controller PC's tried
Atom Dual Core Win7x86
P4 3GHz single core with discrete graphics card Win7 x86
Swapping out controller PC's had no effect on the movement.

Ii am appealing to others who might have had some experience with an issue like this or even those who might have an educated guess.
The ESS has otherwise performed faultlessly, giving my machine nice smooth movement and an audible change in the sound of the motors moving.
If anyone can help me get my "accelerator pedal" back it would be very much appreciated.

Regards
Ross





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