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Author Topic: lost steps on y after a z move.  (Read 2779 times)

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Online Tweakie.CNC

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Re: lost steps on y after a z move.
« Reply #10 on: August 21, 2017, 03:30:23 AM »
Hi Buchanan,

Could you attach your .xml file.

This is in your Mach3 folder titled <your profile>.xml (typically Mach3Mill.xml). Copy and rename the file to Buchanan.xml and use the 'Additional Options' to attach to your post.

This file will let us check your Mach3 settings, and hopefully spot a problem.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: lost steps on y after a z move.
« Reply #11 on: August 21, 2017, 03:53:43 AM »
I have now plugged the Y axis into the 4th axis and produced a perfect pocket.

The only problem is that I use the 4th axis for the knee on the mill or a dividing head.  I use the knee for large height adjustment so it is not moved when running a program but the dividing head will be a problem.
Re: lost steps on y after a z move.
« Reply #12 on: August 21, 2017, 05:54:55 AM »
Hello Tweakie.

Here  is the Buchanan.xml; file attached.  I had to attend to a few things so it took a while.

  Rich.

 I checked my backlash, it is somewhat less than 0.01 mm . I have pre loaded thrust washers on my screw ends 20 diameter screws  and a double  ball nut. One fixed and the other spring loaded against the first. I built this mill specially for fine engraving.

i will post a picture of the engraving I am having trouble with, as soon  as i have a good one.

Regards
Buchanan

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Re: lost steps on y after a z move.
« Reply #13 on: August 21, 2017, 07:20:00 AM »
Hi Buchanan,

Just a couple of things you may like to try…

1) In Input Signals you have Port1 Pin10 allocated twice (Input #1 and EStop). You may have good reason for this but it needs checking.

2) In Motor Tuning try increasing Step Pulse to at least 2 uS and save changes.

3) In General Configuration increase Look Ahead from 20 to 200 and un-check Use WatchDogs.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: lost steps on y after a z move.
« Reply #14 on: August 21, 2017, 07:41:35 AM »
Thanks Tweakie.

I will check those out.
Re: lost steps on y after a z move.
« Reply #15 on: August 21, 2017, 09:11:34 AM »
Here are two photos , one of the problem and one  when my mill is behaving itself. I have not made your changes yet Tweakie.  I will do them now and see what happens.
Thanks everybody for your input.

Buchanan
Re: lost steps on y after a z move.
« Reply #16 on: August 21, 2017, 09:19:15 AM »
The sun is for hand for a clock that I am building. You can see more at :http://www.my-time-machines.net/astro_index.htm
Buchanan
Re: lost steps on y after a z move.
« Reply #17 on: August 21, 2017, 09:25:03 PM »
Tweakie.

I cannot comment on the reason for point No 1.  I have deleted the #1 input.

I increased both the step and direction signals  to 2uS and changed look ahead to 200.

Then I set all my axis back to normal and ran the sun program. It is much better but not perfect yet. 

Should I up the step and direction pulses again to , say, 4 uS ?

I will try it  now and see.

Buchanan
Re: lost steps on y after a z move.
« Reply #18 on: August 21, 2017, 10:14:31 PM »
Tweakie.

I set the step and direction pulse to 4 uS and ran the program again.

The result: A perfect part.   

A question:  How long can I make this pulse. When does it become too long and what will happen then. Or in other words, how does one  arrive at the best setting?

What ever the answer, I have a cure. 

Many thanks everybody.

Buchanan

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Re: lost steps on y after a z move.
« Reply #19 on: August 22, 2017, 01:40:16 AM »
Hi Buchanan,

If 4uS works OK then stick with that (Gecko recommend a minimum of 2uS and I think general opinion suggests a maximum of 5uS).

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.