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Messages - Buchanan

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1
General Mach Discussion / Re: lost steps on y after a z move.
« on: August 23, 2017, 06:49:17 PM »
Thanks Tweakie.

I am relieved and happy.

Here is the finished article.

Made two other parts yesterday and they were good.

Thanks again everybody.

2
General Mach Discussion / Re: lost steps on y after a z move.
« on: August 22, 2017, 10:31:05 PM »
Another dumb question . 

I come to start my computer this morning and I thought to check my motor tuning.  What do you know , but my pulse width has reset to 0 uS.  Well, perhaps I did not save the settings , so I do this.  Then I thought: I will test this out. So I restart my computer and  and check my pulse width again and it has reset to 0 uS. Now i must be getting old, grumpy and suspicious. I check out all the changes Tweakie recommended and they have all changed back to the old settings. I am now just as old but more grumpy and suspicious.

So I reset all the changes back to Tweakia's  and I  start to restart my computer. This takes a little long to do, so, rather than restart , I shut down Mach 3 and reopen it. Now  all the changes remain correct.  So I then restart my computer, now everything  remains correct.

I am now old , grumpy suspicious and baffled!

Is there a proper procedure to make sure all settings are saved.

One thought occurs to me: last night I left the workshop in a hurry. I just flipped all the switches off on  the power board, didn't shut Mach 3 down or the computer.




3
General Mach Discussion / Re: lost steps on y after a z move.
« on: August 22, 2017, 01:45:18 AM »
Hello Tweakie .

Many thanks.

 I have just realized again what a fantastic system you have here.  I have also realized how much I rely on this little machine.

Regards
Buchanan

4
General Mach Discussion / Re: lost steps on y after a z move.
« 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

5
General Mach Discussion / Re: lost steps on y after a z move.
« 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

6
General Mach Discussion / Re: lost steps on y after a z move.
« 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

7
General Mach Discussion / Re: lost steps on y after a z move.
« 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

8
General Mach Discussion / Re: lost steps on y after a z move.
« on: August 21, 2017, 07:41:35 AM »
Thanks Tweakie.

I will check those out.

9
General Mach Discussion / Re: lost steps on y after a z move.
« 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

10
General Mach Discussion / Re: lost steps on y after a z move.
« 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.

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