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Messages - RICH

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5631
General Mach Discussion / Re: Problems threading on the lathe
« on: October 07, 2009, 10:29:59 AM »
Sounds good to me.  I am very curious.
RICH

5632
General Mach Discussion / Re: motor madness
« on: October 07, 2009, 08:45:41 AM »
Only did a quick read of what you posted. Two things come to mind from what you describe though.
- Automatic current reduction - see if there is a jumper to turn it off or extend the time before the reduction takes place as that has was a problem with a few some other boards.
- The other one is try lowering  the current setting or make sure it is correct for the motor wiring ( 2A). 
Again just a quick read of it all,
RICH

5633
General Mach Discussion / Re: Problems threading on the lathe
« on: October 06, 2009, 10:47:38 PM »
ART,
All i can do is try to give you info that is repeatable here and measured quite accurately. If you want to try something, just send it to me.

It would be nice if the threading diagnostics would "capture" the info it's displaying as that may give you a look at
each complete threading cycle for comparison. 

The only other thing we can do on my end is, maybe, is to capture the spindle  triggering tiiming and also put an encoder on the end on the Z axis and capture it's movement relative to the spindle. I can't do that, but  i know
 a friend who would probably do that  and has the expensive o'scope that would do it. But not sure it would be of value and that takes some time to do it right.

RICH
 

5634
General Mach Discussion / Re: Problems threading on the lathe
« on: October 06, 2009, 08:43:40 PM »
ART,

Just a few more tests.
I was curious on how things would behave as the spindle speed was increased.

In post # 481 things scaled rather linear at 115 rpm. as shown below.

TPI       TRUE PITCH     MODIFIED PITCH
10         .1                  .1008
20         .050               .0504
40         .025               .0252

So i did some testing at higher spindle speeds. If I go past 600 rpm i would need to change kernal speed
above 25000khz so a little limited ( trying to keep stuff constant).

The threading was for 10 TPI ( .1 pitch ) 40 passes.
RPM      PITCH / Inch                   MODIFIED PITCH USED FOR PERFECT LEAD
            (DECREASE)
115      .008                               .1008
194      .0055                             .10055
402      .0035                             .10035

So the pitch decreases also as the RPM increases. I will assume that for smaller threads at the higher rpm
they would proportionately decrease as like the 115 rpm tests for 10, 20, 40 tpi.

Just a note, according to Mr. Smid, a lead error will be intoduced on long threads if you use a Feedrate less than
six figures ( not required for leads divided into 4 or fewer decimal places ).

RPM
--------
I din't try any of the advanced threading plugs in yet.  I will confirm my measured spindle rpm's  later since a  friend will be lending me an accurate time measuring device. 

I wonder if the error goes away at 1000 rpm?


RICH

5635
General Mach Discussion / Re: Screw Thread Pitch Control
« on: October 06, 2009, 07:19:25 AM »
Jim,
Yes
Rather than repeat what already has been posted I would suggest you take a look at the thread
"Problems Threading On The Lathe". You need an index input in order to have the G32 cycle work.
In the last few pages of that thread you will find explainations of how the threading cycle works. Take a look at some of my recent postings on what tests i have done and how they were done. That includes both the threading cycle and testing of the lathe and computer.
RICH

5636
General Mach Discussion / Re: Problems threading on the lathe
« on: October 05, 2009, 10:52:05 PM »
Hmm,
Ok, i have a working opto that i can use and can make up a multislot disc rather easily for it. One is encoder #3 and one is the index in the pin out if i rememeber correctly.Since both work off 5 volts that may be rather easy to do now for me.  I thought i could be rather tricky and just take spindle and Z axis ft /min, but quickly found out that my rpm counter is not accurate enough.

I will do some testing at other spindle speeds to see what happens.
RICH

5637
General Mach Discussion / Re: Problems threading on the lathe
« on: October 05, 2009, 10:37:57 PM »
ART,
Assume the advanced threading plug in was the one we trying to use a few months ago.
Is that correct?
RICH

5638
General Mach Discussion / Re: Problems threading on the lathe
« on: October 05, 2009, 08:26:20 PM »
Here is apicture of the threads done in last post. There is only one single scribed line on each piece.

BTW, you need a realy good top notch tach to measure IPM accurately. Just thought i would mention that in case you try to measure and associate spindle rpm to actaul Z feedrate while threading. Myspeed indicator just doesn't cut it.

RICH

5639
Well the new computer i had put together didn't require nothing to be done to it!
I posted info on it in thread about my lathe conversion.
What more can i say ???
RICH

5640
G-Code, CAD, and CAM discussions / Re: widening a line in LC
« on: October 05, 2009, 07:51:01 PM »
I think there is a some info in the manual, one of the tutorials, about using lines. Just that you need to take what is in the manual info and creatively apply it sometimes.  ;)
RICH

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