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Author Topic: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!  (Read 4409 times)

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Hello everyone, I'm new to the forum but have been a Mach3 user for some time.  I just started using Mach3 Turn for my converted lathe, everything is working perfectly aside from the threading wizard.

So here's what happens:  Cutter moves to the start point (Z0), steps in to cut, makes a pass, steps in to cut again and continues to cut in the same direction until it's out of code or hits the chuck.  (ouch)  The code clearly has a G00 rapid with coordinates to return back to the origin (part Z0) but the lathe is isn't responding.  Very odd.  Almost seems like it studders during the rapid and doesn't move.

The preview tool paths look correct.

Other wizards work fine, they also generate G00 moves, no issues, no lost steps, parts turn out perfect.


Is this a setting problem???

Any help would be greatly appreciated!

Again, everything else is working perfectly on the machine, this the only glitch I have.


Thanks,


Damon


www.damonjurkiewicz.com



Important Data:


Mach 3 Version R2.63
Simple threading (Lathe) 1.17

G Code Sample

(Taper = 0)
(Infeed Angle = 29)
(Total_Depth = 0.035)
(StartZ = 0)
(EndZ = 1)
(Seq = 0 )
(Min_Decrement = 0.006 )
(Dia Mode )
G95
G0 X0.75 Z0
G0 X0.725
(Decrement = 0.025 pass 1)
G01 Z0
G32 X0.7 Z0.0069 F0.2
G32 X0.7 Z0.9825 F0.2
G01 X0.75 Z1F0.2
G00 X0.75 Z0
G00 X0.725
(Last Pass ID_OD = 1)
(Decrement = 0.0099 pass 2)
G01 Z0
G32 X0.6901 Z0.0096 F0.2
G32 X0.6901 Z0.9825 F0.2
G01 X0.75 Z1F0.2
G00 X0.75 Z0
G00 X0.725
( Last pass at depth of 0.0001)
G01 Z0
G32 X0.69 Z0.0096 F0.2
G32 X0.69 Z0.9825 F0.2
G01 X0.75 Z1F0.2
G00 X0.75 Z0
G00 X0.725
( Spring pass number 1)
G01 Z0
G32 X0.69 Z0.0096 F0.2
G32 X0.69 Z0.9825 F0.2
G01 X0.75 Z1F0.2
G00 X0.75 Z0
G00 X0.725
G00 X0.75 Z0


Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #1 on: January 25, 2016, 09:55:00 PM »
Yep, it's definitely doing something weird between threading passes. 

Steppers freak out and miss the entire rapid sequence and start the next threading pass where they stopped. 

Definitely seems like it's the G00 rapid return sequences that are the problem.

Thanks again for the help!

-Damon

Offline Tweakie.CNC

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Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #2 on: January 26, 2016, 02:34:14 AM »
It sounds like you are loosing steps because a motor is stalling.

Try reducing your Velocity and Acceleration settings by 50% in Motor Tuning then save the changes for each axis.

If this cures the problem then, by experimentation, find the optimum settings where motors don't stall (It is usual to increase Velocity until a motor stalls then reduce the setting by 30%, similar procedure for Acceleration).

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #3 on: January 26, 2016, 06:50:53 AM »
Thanks for the response.  I actually went through the velocity and acceleration drill in my problem solving process.  It had no impact other than to slow the events to a more observable speed.  I turned the speed and acceleration down extremely low.  At the G00 lines in the treading wizard the lathe still shuddered.

I can run any other wizard with no issues and they all contain G00 moves.  This is where I'm perplexed.

Could it be something in the threading macros I need to change? G76, G32


Thanks,


Damon
Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #4 on: January 26, 2016, 07:08:10 AM »
Hi Damon,
  Is this a licensed installation ?

R2.63 is quite old too, might consider updating to a more recent ver.

Russ
Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #5 on: January 26, 2016, 07:34:22 AM »
It is a licensed install and yes it is pretty old.  I have never actually run an update on this program.  Will my settings stick or will I have to go back and set all of them again?

Theoretically it refers to the last saved config file right?

Thanks,

Damon


Offline Tweakie.CNC

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Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #6 on: January 26, 2016, 07:56:46 AM »
I am sorry that reducing the Velocity & Acceleration settings did not do the trick - but it was worth a try.

Your .xml file (Mach3 folder) will contain your settings but it is probably best to make a backup of the complete Mach3 folder before installing a newer version of Mach3 over the top of the old one. If your existing settings are not preserved then just copy over the backup of the .xml file.

My suggestion would be that you install version R3.043.062 (rather than v.066 which has had reported problems of one sort or another). The various Mach3 versions for download can be found here http://www.machsupport.com/software/downloads-updates/ in the Mach3 folder of the FTP site.

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

Offline RICH

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Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #7 on: January 26, 2016, 08:06:05 AM »
Install the later version as threading was broke in early versions!

I may suggest you have a look at the write up Threading on the Lathe - Mach3 Turn which can be found in Members Doc's.

BTW, when using the wizard do the calc  as that the will check that the configuration as compared to rpm input such that
you don't exceed you vel & accel settings.

RICH


RICH
Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #8 on: January 26, 2016, 08:07:21 AM »
I will take a deep breath and update Mach3... From what I have read so far this may well cure the problem.  I'll give it a shot when I get home tonight.

Thanks again,

Damon
Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!
« Reply #9 on: January 26, 2016, 08:14:52 AM »
I painstakingly went through the threading guide last night, it's a very good document.  After going through it twice and checking my settings and config I was left thinking the problem may be in the software itself.  I'll find out tonight for sure. 

Thanks again for the help, I really appreciate it.

Damon