sorry. i haven't installed those yet. my machine is just a hobby i do not know enough yet to know if i will need them or not. i just wanted to share the positive experiences that i had. i imagine paul will give you some advice shortly. djs alex wrote:
Thank you, David! But how do I set up inputs from home switches and limit switches? Alex
David Szakovits wrote:
alex,
i asked almost the same question a couple weeks ago. this is a copy of what paul sent me. it was so useful that i am forwarding his instructions to you. it is all the documentation i needed. following this advice, my scale factors were off by a factor of 10, exactly. so it was obvious and easy to remedy.
Using a config that is known to work as a starting point is probably best. The /usr/local/emc/mill_inch_freq.ini is as good a choice as any with the added advantage of being linked to a desktop icon. The first set of parameters that will need changing will be OUTPUT_SCALE and INPUT_SCALE to match the stepper motors & feedscrews. Assuming a 1:1 gearing, no step multipliers in the Gecko drives, and standard 200 steps/rev motors, the correct number would be: TPI * 200
Once the scales have been set, you can play around with the velocity and acceleration parameters - A general rule of thumb here is the max velocity can be found by taking 1/([EMCMOT]PERIOD * OUTPUT_SCALE) divide by five so that you don't trigger following errors at high speed..
Once you have found the maximum accelerations and velocities, turn them down to the lowest values that are acceptable - You are tuning for longevity not the fastest way to wear out a machine.
If you wish to sidestep tuning of PID parameters, change the EMCMOT driver from freqmod to quickstep.
alex wrote:
Hi, folks! I was able to install latest BDI with great success! I have a 4 axis machine, a punch press. All axes are linear. How do I set up an ini file, were can i find a manual for this? Can I use a sherline inch EMC - it looks great! Alex _______________________________________________ Bdi4emc-help mailing list [email protected] https://lists.ourproject.org/cgi-bin/mailman/listinfo/bdi4emc-help
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