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Messages - RICH

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5541
General Mach Discussion / Re: Problems threading on the lathe
« on: October 22, 2009, 05:51:13 PM »
ART,
 :) :) :) :) :) :) :) :) :) :) :)
Now this is good news!

Tests all done with Ver.028 - OCT22-1 as shown below:
20 passes @.0002" / pass
Spindle Speed Averaging / Constant Velocity / Debounce Interval=600
Index Debounce=10 Z=60 IPM @ 6 accel  / X =80 IPM @ 8 accel

RPM  PITCH    LEAD ERROR AT LENGTH ( +=INCREASE -=DECREASE)
               0.5"         1"        1.7"     REMARKS
----  -----  -----         ------    ------    -------------------------
116   .1     N.A.          -0.0008   -0.0008
402   .1     N.A.          -0.0007   -0.0011
116   .5  +0.0000 /.0014"  +.0.0005 / 0.0014   Just measured at two  different places abt 180 degrees apart AT 1/2" and 1" lengths.

Attached are the data reports for each.

From a practical point,if actual threading was done and you could hold the diameter and cutting was good, then based on the lead errors above,you would produce a Class 3A thread.

There was a little of the "oscilating" seen but I think what i was realy seeing was backlash. The Z has 0.0008" and the X has 0.0003".

One of the things that come to mind is the acceleration and deceleration.
What i saw  was the "oscilating" starting to occur at about 2 threads short of the end of the thread and after 10 thread cycles. Could be wrong. As long as your in these kinds of tolerances who cares!
   
SO need to have additional testing to see if the above holds true over time.

RICH

5542
General Mach Discussion / Re: Problems threading on the lathe
« on: October 22, 2009, 12:28:56 PM »
Just a thought, trust that from a programing point of view, I am just plain stupid.
But, what if for a split second Windows was to divert and then the data would be recieved by Mach a little late,
and it continues and that causes a screwy move, because of Windows?
Or how about Mach not implementing a correction unless it's seen twice?

I am getting a little off track, but want to be open minded on the screwy moves.

RICH

5543
General Mach Discussion / Re: Problems threading on the lathe
« on: October 22, 2009, 12:18:03 PM »
ART,
?- How many steps/inch is it set to.
X is 12700   Z is 20300
Out of curiosity i did a G01 @ F.01 for an .1 travel of the Z a few days ago.
While reading a book, was just like a Swiss watch listening to the stepper pulse, tic , tic , tic,

never missed a beat.

?-   Am I right in assuming the entry alwasys seems to look good on the crazy passes, but the

only thing you notice is the thread pitch is off, that it gets longer by  a set amount and gets more

out of position the longer the thread?

Yes. As far as i can tell @ 30x mag. Since your almost cutting air, ie; the scribe line is realy fine,  

but i would see if it changed by over .001".

?-seems your crazy pitches are advanced to the req. pitch

Yes, even when / if it oscilates, ie; it stays within say a range of .0035", may be multiple scibes
as i had shown in one of the replies.

?- you call for .2 pitch, your not quite double what a .1 pitch does
True, it is not linear along the thread, so if you take the longest length, then the error / " is different

than if you used the 1" mark. A single scribed line provides a definit measuring point. When you

have two of them, then you don't know which to use as one has a different error than the other,

small but different. SO you can play with the mean square root of those readings, but the average

measured between them is what i posted.  I would suggest you stay with the single scibed line

numbers and it is ususlay around .0035"/ inch as that has accured so frequently.

?- Can you do .5" at 115RPM? 1Inch pitch?
Hmm... using 115 rpm 0.2P=23 ipm
                                 0.5P=57.5 ipm
                                 0.8=91 ipm
                                 1.0=115 ipm (nope start skipping at 110 or so)

?- We may be too small in pitch to tell though.
Yep, only have a rather narrow range of data from tests.
I guess it would be nice to have data for the following:
RPM    PITCHES
-------    ---------------
100     .O125
200     .050
400     .1
800     .2
1600   .4
Thats 25 samples, and then should do at least 2 runs, which becomes 50 samples.
 I can't thread for that full range .

I believe the lead can be corrected or brought into some range, but again, i would go back to a

standard to quantify just what that error tolerance means.

Good to 0.8 P. I am limited to directly measuring the lead with the tool makers microscope  to

2" before i need to move the piece and start from another reference point.
So i introduce some error in lead the measurement when that is done.

As far as the screwy moves:
I want to try something, namely using Chips screen which has a large path display, also fool

around some while threading and monitoring Windows / MACH CPU usage. Basicaly i want to see

if getting more attention to it may have an effect on those crazy moves. Nothing ventured nothing

gained.


Comment on your post #589
That would agree with me changing the pitch in the wizard from say .1 to .99****************** or .100*********.

The rpm was fixed but the wizard did in fact create code with that  pitch , even though while in the

wizard it will round the number. The resulting thread lead error was reduced but still influenced by

the RPM change of 1.  

I'll run the OCT22-1 version.
Need to do a few things, so back in a few hours.

RICH

5544
General Mach Discussion / Re: Problems threading on the lathe
« on: October 22, 2009, 08:10:44 AM »
ART,
How goes the number crunching?
RICH

5545
General Mach Discussion / Re: loading gcode to mach3
« on: October 22, 2009, 07:50:05 AM »
- I can't figure out how to load it in to mach3
Deskengrave may create the file with an ext such as ".DNC" , so you may want to open it in Notepad and save it as a text file. You then just open it in MACH.

- Does mach need to be licenced to accept anything but lazycam?
No

- 500 line of gcode is plenty
Well yes and no! You will find that canned cycle, even though less than 500 lines, that it will not run becuase it actualy is doing more than 500 moves, if that is a way of saying it.

Why not purchase a MACH License if you are going to use it? Nothing is realy free!

RICH

5546
LazyCam (Beta) / Re: problem with lazycam
« on: October 22, 2009, 07:16:06 AM »
Edmund,
Have look at the LazyTurn Manual - Appendix "B" located in Members Docs. I t talks about common mistakes made in CAD.  The errors are generic.
RICH

5547
General Mach Discussion / Re: Quick question.
« on: October 22, 2009, 06:55:02 AM »
John,
Could be a number of things ie; post processor, the arc Gcode used, etc.

I suggest you read the MACH3 Turn Arc Motion Tutorial which is in the Members Docs. Here is the link:

http://www.machsupport.com/forum/index.php/topic,11932.msg76353.html#msg76353

That will give you a good understanding on arc programing.
RICH

5548
General Mach Discussion / Re: testing programs
« on: October 21, 2009, 08:11:55 PM »
krymis,
To do some initial tuning and checking out of your mill.
Open Mach 3 Mill, then click the Settings tab at the top  of the screen, click the set steps per unit above the Reset button. In the fly out, put how far you want to go ( you can use a "ruler"), the axis will move and the screen will ask you how far you noved, you then tell it and it automaticaly sets your stepss. Very fast and accurate.

Now go to Config>ports & pins> motor tuning > do a velocity of 10 and a accel of 1 and see if the motors skip,
 if they don't ....increase the steps  per unit by 10 and accel by 1, try until thr motors skip. At that point back off by say 70%.
RICH

5549
General Mach Discussion / Re: Problems threading on the lathe
« on: October 21, 2009, 10:05:35 AM »
ART,
Sure seems that way.  I quess the only thing you can can do is pick some guideline and then test it out.
For multiple scribed lines i just use the middle as a reference unless i can identify which is which and can relate the difference. ie; different leads but within a tolerance.

What is puzzling is the screwy passes. It seems the data will identify one of them but not provide reason for the
the ones following, it kind of settles out.  If it's not the machine or the threading programing, then what is interfering........may just be a Windows thing. Discussed this with Chip and also a friend.....
sort of like that old camera commercial "it has mind of it's owne, you can try to take control, but it will still does what it wants". I will try a few simple things to see the effect ......later. For now i want to stay focused on the data
and whatever you need to make intelligent changes.

Just remember "crap in crap out"...........  :D

RICH

5550
General Mach Discussion / Re: G0 Problem
« on: October 21, 2009, 12:28:59 AM »
I suggest the following.
Whatever your max velocity is ( were the motors will start to skip ) set your velocity to 70% of that max setting.
Adjust the acceleration also. That should keep you from skipping steps.
RICH

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