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Author Topic: A axis isn't working  (Read 7105 times)

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Re: A axis isn't working
« Reply #20 on: October 09, 2013, 02:42:02 PM »
Thanks for the replies.

Here is the XML file.

Re: A axis isn't working
« Reply #21 on: October 09, 2013, 05:52:25 PM »
Oh, the joy!

Changed the Steps Per to 4.4.

I tried an MDI of G00 A360 F3600 but that didn't change the behavior of the a-axis.  Al, is this what you meant by controlling the feedrate in your F3600 comment?  I didn't see another way to change the feedrate for a particular axis.

Next, I set the Velocity to 3600 in the Motor Tuning (see attached pic). Now the a-axis rotates to the proper angle! (I do need to add more decimal values to the Steps Per like 4.4444.) The drive belt chatters or vibrates a bit on ramp up, but the motor sounds normal.

So, due to everyone's help, I am making progress.

Thanks a ton.

The spreadsheet is very helpful as well.

Offline Fastest1

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Re: A axis isn't working
« Reply #22 on: October 09, 2013, 09:27:56 PM »
Slow the accel rate down to lessen the chatter.

Are you using a G540? It sounds like you must be running a 10x microstep value. I just went back and read you are running a Xylotex on 1/8th. The math isnt working for me.
3600 steps per?

Yes F in a gcode does pertain to feed rate. On a rotational axis F360 would be 1 revolution per minute, 3600 would be 10 revs. If that is what you were asking.
« Last Edit: October 09, 2013, 09:32:46 PM by Fastest1 »
I want to die in my sleep like my grandfather, not like the passengers in the car! :-)

Offline alenz

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Re: A axis isn't working
« Reply #23 on: October 09, 2013, 10:57:21 PM »
A bit of clarification. The G00 is a rapid command, that is it ignores the F word programmed feed rate. It will move at the max feed as designated by the velocity set for that axis in the Motor Tuning.
A G01 will move at the programmed F feed rate, (as long as it does not exceed the max set in Motor Tuning).

You will need to determine the max velocity and acceleration for each axis in Motor Tuning. To do this, increase each parameter (velocity and acceleration) one at a time until the max is found. The max is where the stepper stalls, (it will not move, just buzz). Then back off 15% or 20%.

You are getting there!
Re: A axis isn't working
« Reply #24 on: October 10, 2013, 02:17:50 PM »
Thanks for your helpful replies.

My next step now is to learn more about g-code programming.

Problems are really good because they help (with all of your advice/assistance) advance my understanding. I've made leap in knowledge as a result of working through this situation.

Thank you.

Re: A axis isn't working
« Reply #25 on: October 19, 2013, 12:58:59 PM »
Here are two pics of the now-working A axis. Thanks to you folks on the forum this upgrade to my 3 axis machine is working well.

Offline alenz

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Re: A axis isn't working
« Reply #26 on: October 19, 2013, 02:59:37 PM »
Good Show!