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Messages - jamiedaugherty

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11
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: January 13, 2016, 08:30:00 AM »
I have not worked out why, but it seems that having anything to do with a CNC means either that you pay large amounts to a service technician OR you have to have a DVM and an oscilloscope, at a minimum. That's life.

But there is some satisfaction when you find the bug and fix it. :-)

Cheers


I have a scope so that is a not a problem.  What I can't figure out is why everything seems ok - one day it worked and the next it didn't without any apparent cause.  I fear that I'm going to have to dig really deep which could take a lot of time.

12
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: January 12, 2016, 05:32:11 PM »
Hi Jamie

OK, so it used to work but now it does not. So, something has changed. There are three possibilities:

1) The Mach XML file has become corrupted and needs fixing. Sadly, that seems to happen a fair bit. But it can be fixed by going through every (damn) screen and checking every detail. Many of us have done that.

2) The hardware has suffered a failure somewhere. This may only be a partial failure. only operating some of the time. It may only happen at speed: Rc filtering perhaps. For this you will probably need an oscilloscope. Sorry about that.

3) The 3rd possibility is a funny one: an interaction between HW and SW. I found that my displayed spindle speed was fine up to ~2200 RPM, then it went haywire. But the HW signals going into the ESS were fine at all speeds. It turned out that at 2200 RPM the Index pulse width dropped below the Mach SW filtering threshold, and so Mach was not seeing the Index pulses any more. I cancelled the filtering.

Cheers


Thanks, I'll take another look and see what happens.

13
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: January 12, 2016, 04:54:13 PM »
Be of good cheer. Threading does work very well. I use it all the time.

I am running W7, M3...062, with an ESS, and standard lathe screen set.
You need a good clean Index pulse, and to enable spindle averaging.

Cheers
Roger


I also use it all of the time....or should I say USED to use it all of the time.  I have a bunch of production parts that have threading cycles which have worked great for a long time.

I'm really disappointed that nobody can help understand why it stopped working.  Everything else is checking out ok (I double checked the indexing and that looks fine).  It is really frustrating because a CNC lathe that cannot make a thread is not very useful.  Kind of running out of ideas here!

14
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: January 08, 2016, 03:27:15 PM »
Can't help you if you don't want to do as requested since
I will need to dupicate what you are doing asking some simple
questions based on eliminating posibilities to begin with.

G96 is constant surface speed, G46 sets the max speed when in G96,
and G97 turns CSS off ( from my notes / not in the manual, and I
don't use them ).

If you did read the Threading on the Lathe Manual, page 4,
How It Works, then would understand a little why I request using the
generic screen set. There may be problems when using CSS as it may
be fighting the threading which is reading true time rpm value and adjusting the next pass based on the monitored rpm during the threading.
If it does not see the index then the treading cycle won't start. It waites for  an index and changes from G94 to G95.

For Now,
RICH


So, I tried using the standard Marc3Turn screen and that doesn't work at all - it was never configured for my machine so it just throws out a bunch of errors. 

I tried my threading test program again (using my custom screen) and it still does the same thing.  It is exactly the same behavior as when using a free license.  I'm hoping someone has a clue why it would start acting up all of a sudden after working for a long time.

15
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: December 25, 2015, 03:41:48 PM »
Actual spindle RPM is very steady, no issues there I can tell.  Is it easy to go backwards to v62?  Would I be better off migrating to Mach4?  I don't want to make a science project out of this, but I DO want to get the threading working again.

16
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: December 25, 2015, 12:40:58 PM »
- Index works fine, at least from what I can tell.

Ok, well, I thought it was working!  Your comment got me thinking so I double checked - lo and behold I'm only getting one index pulse every 2-5 seconds at 1000rpm.  I'm guessing my sensor is bad.  There are no markings on it so it's going to be interesting finding a replacement.

Thanks again for all of your help, hopefully this is my problem.

17
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: December 25, 2015, 10:37:53 AM »
Thanks for the response!!!  I'll give you some insight to see if this helps better understand my situation:

- After I purchased a license this was working great.  It was only in the last month or so it reverted back to the issues I had prior to using a purchased version.  Why would v66->v62 fix this?
- Again, could you please explain why the screen would make a difference?  This is a custom screen that has always been used with this machine, I don't think I've ever opened anything else.
- The spindle only works automatically, there is no manual control on this machine.
- I made the code using the wizard initially and only changed the H variable (was 0.021 I think) just to see if that would help, no change.
- G30 with U and W is what works on this machine.
- G48 is used to clear the tool offsets just as good programming practice.
- G97 is what I want, not G96 CSS
- Index works fine, at least from what I can tell.


I guess what still has me scratching my head is why it work then stop all of sudden?  Something must have changed, but I know wasn't my test program.

I'm going to change my CMOS battery to see if that helps.  I'm still wondering if the system date/time could be the problem.  I'll post the results after I try that.


18
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: December 23, 2015, 09:59:24 AM »
Something else to throw out: my PC is old and I have to hit F1 to get through BIOS.  That throws my date off to sometime in 2005.  Even if I change the date in Windows the threading still doesn't work.  Could this have something to do with it?

19
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: December 23, 2015, 09:54:46 AM »
What is it doing again?

Post you xml file again and the gcode file you tried.
Are you using the simple threading wizard to generate the code?

I am guessing you are new to using Mach3 Lathe.
I strongly suggest you have a read of the Manual. Also have a read of Threading on the Lathe write up which can be found in Members Doc's.

RICH


Here is the xml file.  The code I'm using is this:

%
G30 U0. W0.
G90 G95 G54 G48 S2000
T0707
G97 S402 M04

G00 X2 Z0.3
G00 X0.65
G00 X0.625

G76 X0.5568 Z0.700 Q1 P0.0556 J0.005 L45 H0.0141 I29 C0.025 B0.0001 T0

M5
G30 U0. W0.
M30

%









20
General Mach Discussion / Re: G76 Lathe Theading Problem
« on: December 20, 2015, 01:36:12 PM »
Not new, been using it for about three years.  I used the wizard to generate the code originally.  I have read the manual.

It is doing exactly the same thing as before - first pass is ok but all other passes are at the maximum machine speed.  I'm trying to tune in my tool offset because I have production parts to make (already programmed).  

I'm not at the shop now but will get the xml the next I'm there.  Why would that have changed???

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