It may be dos time

[craig]

Iam pulling my hair out with the stepper ini. I can get f20 and sometimes f30 but if I do a g0 the emc dro run and the motor stops and hums or I get a Jont 0 following error.I am using the Xylotex 3 axis board and the x and y axis is has no pullys to the 276oz/in steppers on a x2 minimill with the lead srwews that came with it. it work great with mach3 but I hate bill and winblows can anyone help and please dont send me a link to the docs as I have read them. the gcode runs fine if I edit all the g0 and put in g1 f10 but now the files I need to use are to big to edit like that.

TIA
Craig

[jim_geib]

Craig,

You are trying to spin the stepper to fast. The higher the RPM the lower the power. Or you may have the acceleration set to quick. I am using Mach3 software and on motor setup I can adj. the time it takes the motor to go from 0 RPM to its fastes RPM. I also use 2:1 gearing on my motors.

Jim Geib
Mansfield, Ohio

[yetiman]

I had the same problems with emc. I think it is a problem with how fast the computer can generate the pulses as opposed to how fast emc2 thinks they should be generated to achieve the programmed speed. The thing that always drove me nuts was how in the world do you get following errors on an open loop system.

But that aside keep bringing your numbers in your ini file down that control the speed.
I know that asked for no links and trust me this isn't an RTFM, I've been in more than one flame war with a$$s who never answer anything just point at the docs, but this was one of the places that gave me a hint to solve this.
http://wiki.linuxcnc.org/cgi-bin/emc...ollowing_Error
I also searched the mailing list quit a bit.

What it boiled down to was alot of expermintation with the settings look in your axis settings. Try lowering your MAX_VELOCITY setting first. Then move on to MAX_ACCELERATION and STEPGEN_MAXACCEL settings. Keep bringing these down until you can perform a rapid move without the following error. Do this for just one axis to start with and remember that emc2 needs to restarted for changes to take. I think there is a way to force it to reload the ini files but I don't remember what it is.

I finally had to give up on emc2 the pc I was using was an 800 mhz machine and I could never get it to move the axes faster than 8.0 ipm without faulting out. There might be a way around that though, but I never found it. I would love to be able to go back to emc2 right now I'm using turbocnc and cnczeus. Mostly cnczeus as the backlash comp works well for my setup.

[AXIS_0] TYPE = LINEAR UNITS = 0.03937007874016 HOME = 0.000 MAX_VELOCITY = 1.2 # NOTE: the step generator module applies its own limits to # acceleration and velocity. We have discovered that it needs # to have a little "headroom" over the accel by the trajectory # planner, otherwise it can fall slightly behind during accel # and later overshoot as it catches up. In the long term we # hope to come up with a clean fix for this problem. In the # meantime, please set STEPGEN_MAXACCEL below to a few percent # higher than the regular acceleration limit MAX_ACCELERATION MAX_ACCELERATION = 20.0 STEPGEN_MAXVEL = 1.4 STEPGEN_MAXACCEL = 21.0 BACKLASH = 0.000 CYCLE_TIME = 0.001000 INPUT_SCALE = 4000 0 OUTPUT_SCALE = 1.000 0.000 MIN_LIMIT = -10.0 MAX_LIMIT = 10.0 FERROR = 0.050 MIN_FERROR = 0.010 HOME_OFFSET = 0.0 HOME_SEARCH_VEL = 0.0 HOME_LATCH_VEL = 0.0 HOME_USE_INDEX = NO HOME_IGNORE_LIMITS = NO

[craig]

Thanks guys for your help

Craig

[kochevnik]

Yetiman: do you know if CNCZeus has a G code which mills slots ? Some programs call this a zigzag command - You might move from X0 to X2 back and forth dropping down 0.1 inches each time till you reach a specific depth. TurboCNC does this nicely (G77 command) and I am looking for another simple CNC program which does this same thing.

Thanks.

[yetiman]

The custom macro capability of cnczeus doesn't exist from what I've seen which is what I think you are asking about. They have a free download version that is limited to 50 lines of code and the docs for it are a free download if you'd like to try it out. There are the usual drilling cycles, and a handy circular command, but nothing that I've run across that would let you specify say a begining and end set of coordinates with something x, y, z, i, j, k that would then cut a slot.

I did like the fact that turbocnc would let you use variables I got really used to that using fanuc controls at work. Being able to right a few lines of code that perform a simple loop can really simplify the gcode. The thing that really sold me cnczeus as a dos solution for me was the backlash compensation and the cutter comp. In turbocnc backlash comp was always incredibly slow. Everytime an axis needed to reverse everything would just stop as the motor ticked over the number of steps to allow for the backlash.

Another thing about cnczeus is that all of your leadscrews need to be the same pitch and driven at the same gear ratio for interpolation to work right. I've emailed support at cnczeus about this to see if there is a work around or fix but haven't heard back yet. <<<<< This seems to no longer be true. I've tried the newest version with the same setup as above and it seems to work fine with different pitch leadscrews now. <<<<<<

In the end both have some problems the best bet is to try them see which fits better.