Messages

51

General Mach Discussion / Re: Troubles with PWM output Voltage

« on: January 11, 2014, 10:26:14 PM »

When you reversed dir low active and step low active ( see pict. ) using  your attached profile it should work.
When Mach is in Reset state there must be 0V with this settings.
Alex

52

General Mach Discussion / Re: Brushless motor as a spindle ... And controll it with mach3

« on: January 11, 2014, 05:39:04 PM »

Not only resistors, kind of IC on the bottom.
1.5 to 2.5 msec pulsewidth PWM.
found this on YouTube

http://www.youtube.com/watch?v=DUzuEt8fmJ8

The Pokeys device has adjustable PWM outputs.

Alex

53

General Mach Discussion / Re: Troubles with PWM output Voltage

« on: January 11, 2014, 04:59:08 PM »

In MotorTuning reduce the steps per to 50 and set the spindle acceleration  to max.
Alex

54

General Mach Discussion / Re: Steps per inch (Uneven numbers)

« on: January 11, 2014, 02:43:06 PM »

I understand where you are heading but it is as it is. You need a even Steps per unit to get it precisely. Everything else will be more or less precisely always  "depending on" what you are doing.

Is there a reference to the 10-meaningful-digits-rule, if it is somewhere in the machwiki, or otherwise

No, I think its not.

Alex

55

General Mach Discussion / Re: Troubles with PWM output Voltage

« on: January 11, 2014, 02:19:37 PM »

in"Ports and Pins" " Motor outputs"  Spindle  "Dir lowActive" has to be checkted and "SteplowActive" unchecked, you have it reversed.
Is working here tested with your profile.

Alex

56

General Mach Discussion / Re: Steps per inch (Uneven numbers)

« on: January 10, 2014, 05:58:58 PM »

The 10digits is what Mach3 accept in motor tunig. You can type in more but only 10 will be accepted. The fractional part beyond the 10digits are lost. ( as far as I can see )

Code: [Select]

how is this handled?exactly as you calculated it before 

after 470 rounds I miss 376 steps. When I enter 222.22222, I miss 0.376 steps. When I enter 222.22222222, I miss 0.00376 steps

You can set 222.2222222 steps per degree you lost  0.0376 steps after 470 rounds.

What is good CNC / CAM practice for fractional steps per degree, even as steps per revolution is integral

That depends on what you want to do. If your 4th axis is only traveling a few rounds forward and backwars in G90 mode the whole day that should not be a problem.
But when you travel thousends of rounds in one direction or have lot of subcalls in G91mode that may be a problem. Depending on how precise your work should be.

Alex

57

General Mach Discussion / Re: Steps per inch (Uneven numbers)

« on: January 10, 2014, 10:03:17 AM »

When you travel in one direction the error accumulates as you calculated. When you travel back to the start point the error is 0 because Mach travels all the same way back.
Normally not a big problem as long as the diameter is not too big or the amount of rotaton is huge and you are in G90 mode. If you are in G91 ( incremental ) mode and
working with lots of sub recalls and do a short rot on 360 then the fraction of the last step will be lost ( not really lost - only within your operatin ) whitch can cause a greater
error at the end. The error is alway 0 in G90 mode at the home ( G53 ) position regardless what you did before. That all is what I found by testing no guarantee that is 100% correct  
You can type in 222.2222222 ( 10 places )  When your diameter is 100mm then the circumference is 314 mm you said you miss 0.00376 steps after 470 rounds that is
314 / 360 = 0.87222 mm per degree / 222.2222222 steps = 0.00392 mm per step *  0.00376 steps = 0.000145 mm error on the circumference  after 470 rounds at 50mm radius.
Not too bad I think. Anyway, the best thing of course is to have the mechanical setup so that gives you a even number. If you doent want to change the mechanics there is one way
left to get it 100% precise, you can coose your circle  eg. 400 degree or what ever gives you even numbers, but short rot on G0 or 360 rollover will not work with this setup.

Alex

58

General Mach Discussion / Re: Reload Mach3Turn

« on: January 07, 2014, 08:41:37 PM »

Have a look in xmlbackups folder   C:\ Mach3 \ xmlbackups

rename the file ( if existing ) to *. xml  and place it into the Mach3 folder

Alex

59

Newfangled Solutions Mach3 Wizards / Re: Mach3, Mill Wizard not seeing license

« on: January 06, 2014, 06:53:48 PM »

No probs. 

No, that are the " Mach3 Addons "

see pict.
Alex

60

Newfangled Solutions Mach3 Wizards / Re: Mach3, Mill Wizard not seeing license

« on: January 06, 2014, 01:59:13 PM »

Hi Rob,
there are two different Wizards. The NFS Wizards within Mach3 and the NFS Mill Wizard whitch is a stand alone program for the moment.
You need a seperate license file if you want to use the NFS Wizards within Mach3. In other words everything is ok.

To your problem, fist have a look if the tooltable is in the right location. Config --> tooltable
If not browse to it.

Try opening the simple testfile I have atached

Alex