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71  Mach Discussion / Mach4 General Discussion / Re: Mach4 Screw Error Mapping on: March 11, 2015, 01:02:54 AM
Thanks for the information Steve. Waiting forward to playing with it.

While at it, just would like to make sure we are talking about the same thing. I have a 4.5m long cylindrical grinder. It is real hard to get the 4m long linear guides absolutely straight by mechanical means. I have done so to about 0.05mm. So when grinding a 4m long shaft the fluctuations in diameter are up to 0.1mm. I would like to be able to map the Z axis so that for each Z value, the X moves to correct the straightness error. Is this the feature you're working on now? Asked this on the Yahoo group and had Brian answer this was it, but now I am afraid we didn't understood each other.

Dan
72  Mach Discussion / Mach4 General Discussion / Mach4 Screw Error Mapping on: March 07, 2015, 04:04:51 AM
In the announcements it says that version 2251 has added screw error mapping ( see here ).

But I can't see this... where do I find it? Any info and instructions available?

Dan
73  General CNC Chat / Show"N"Tell ( What you have made with your CNC machine.) / Re: I'm in Hog Heaven on: January 10, 2015, 02:25:54 AM
Well done!

Have to start learning LUA. Need Mach4 functionality on a couple machines. Bought licence copies in pre-release sale, but waiting for the ESS plugin to be fully functional.

Dan
74  Mach Discussion / General Mach Discussion / Re: turret tool changer on: January 08, 2015, 03:31:28 AM
Derek,

The stepper option would be easier. Doesn't require any sort of feedback as it relies on the stepper positioning accuracy. Also no need to mess with relays for reversing. Just hook up a stepper to a drive (which I believe you've done for other axes already so should be no problem). Then just use the macro in the above link.

Dan
75  General CNC Chat / Show"N"Tell ( What you have made with your CNC machine.) / Re: I'm in Hog Heaven on: January 07, 2015, 04:30:26 AM
Nice video. Thanks for sharing.

Just pay attention to the clearance of the tool when you do the hex.

Dan
76  Mach Discussion / General Mach Discussion / Re: turret tool changer on: January 07, 2015, 04:26:50 AM
Hi Derek,

Are you intending to use the stepper motor to drive the turret, or a DC motor? Here are a couple of links that might help you:

http://www.machsupport.com/forum/index.php/topic,22367.msg155832.html#msg155832 posted and example here for a stepper driven turret.
http://www.machsupport.com/forum/index.php/topic,19353.msg134844.html#msg134844 this is the macro I have on my Emco with a DC driven turret.

Dan
77  General CNC Chat / Show"N"Tell ( What you have made with your CNC machine.) / Re: I'm in Hog Heaven on: January 06, 2015, 03:11:36 AM
Since I've made that video, been using this little program every now and then. Saves lots of time and makes life simple. However, cutting a hex with a standard tool bit hardly gives sufficient clearance. Starting from octagon and on things get better. But in plastics and aluminum, hexagons are no problem either.

Dan
78  Mach Discussion / General Mach Discussion / Re: What is the latest Mach3 ver. known to have probing working? on: December 22, 2014, 09:57:05 AM
Hi Terry,

Again the screw is the workpiece. It is mounted between centres on a lathe and the probing is of the side of the flank.

Dan
79  Mach Discussion / General Mach Discussion / Re: What is the latest Mach3 ver. known to have probing working? on: December 22, 2014, 02:01:14 AM
Yes, Terry. I am mapping the screw. It is a feed screw like those used in injection moulding extruders. The lead is not constant - can start from 50mm per turn and then gradually increase to 80mm per turn, then back to 70mm and 60mm. So calculating number of turns isn't going to help much.

Dan
80  Mach Discussion / General Mach Discussion / Re: What is the latest Mach3 ver. known to have probing working? on: December 21, 2014, 05:47:43 AM
Hi Terry,

Thanks for your reply. I did as you suggested - deleting MAch3 directory and starting from scratch. Didn't have a backup for the XML so took me a few minutes to take screen shots of all the settings and have them set back again. Now have the XML saved separately. Haven't yet tried to probe and see how this affected the buggy behaviour.

Now about the application. It is for probing a feed screw with an alternating lead. Y axis is the rotation axis. Z is the longitudinal axis. I have User DROs on the screen for setting feedrate, Zstart, Zend, Probing lengths limit, and probing resolution (how many probing points per single revolution of Y). I could have used pure Gcode with a sub and Vars, without using VB at all. However, I have to have a way to determine where to stop probing. I can't use a sub as I don't know the number of reps (the lead is not constant). This is why I am using While loop.

Oh.. and I am using an Ethernet SmoothStepper for the controller.

Do you think you have a better way of doing what I am trying to do?

Thanks,
Dan
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