Messages

11

General Mach Discussion / Re: Is there a way to Independently move an axis while moving others?

« on: July 15, 2011, 12:09:45 PM »

>you can do a "Swap Axis" VB command and swap your Spindle (which is constant velocity), and your A axis.

That seem great for this and many other 4thAxis-as-lathe jobs!

12

General Mach Discussion / Re: Is there a way to Independently move an axis while moving others?

« on: July 14, 2011, 06:29:09 PM »

That's exactly what I need! A round smooth transition.   So you mean using radius compensation, I didn't get when you said comp the first time.
Going to try it that way.

Thanks!!!!

13

General Mach Discussion / Re: Is there a way to Independently move an axis while moving others?

« on: July 14, 2011, 12:27:40 AM »

jrobson: mmm a dwell I don't think so, because what I need is constant axis move instead.

BR549:  Yes I am using CV. But the X axis makes a 180° move so it has to stop, so it has to decelerate... and then the A axis decelerates accordingly. Thats the problem.  / :   The X decelerating is ok because it would give the smooth return for the screw, but the A should go on at continuous feed.

14

General Mach Discussion / Re: Is there a way to Independently move an axis while moving others?

« on: July 13, 2011, 11:23:04 AM »

Thanks for your reply.
When I say that A axis "waits" it is not that it stops, but that it decelerates accordingly with the X deceleration with the change in direction.

"IF you want a symetrical screw then you need to comp the ends a little"

What kind of comp   That is basically what I need to achieve a smooth transition.

15

General Mach Discussion / Is there a way to Independently move an axis while moving others?

« on: July 13, 2011, 12:05:24 AM »

I'll try explain what I need to do:

I have a 4th axis and want it to move continously at a constant feed while performing a couple moves in another axis.
Is this possible?

I want to move X axis along a cylinder and then back all the way while rotating the cylinder with the 4th axis to make an endless screw that goes back and forth. I would do it something like:
G0 X0 A0
G01 X10 A1800
G01 X0 A3600
But the A axis is not constant because it "waits" for the X axis to decelerate at the change in direction.  I need the A axis to be completely constant.

Is there a way??

Thanks for any help!

16

General Mach Discussion / Re: Strange problem: goes exact mode after mdi

« on: March 29, 2011, 06:54:26 PM »

Oh...!!!!! That's it!  Solution was very simple but elusive!  (at least for me S:

Thanks!

17

General Mach Discussion / Re: Strange problem: goes exact mode after mdi

« on: March 28, 2011, 10:47:51 AM »

Hi Hood,

>The CV LED is staying lit but the feedrate DRO definitely shows a slow down.
The  feedrate slowdown definitely is because it is moving as it would in Exact Stop mode.

>Doing a RFH after the hold, stop, MDI seems to make it ok and I suppose really thats the way you should do it but I will see if I can get a hold of Brian and see what he has to say.
RFH could even be more like a workaround than the  way to do it depending on the circumstances.  With large programs it may be counted in minutes the wait for RFH to "reread" the entire code, is you want to stop and go several times (for whatever reason) it may become very slow.

Thanks for your help!
Luis

18

General Mach Discussion / Re: Strange problem: goes exact mode after mdi

« on: March 26, 2011, 02:31:36 PM »

Hood,
I have answer for all your questions but I do think none of those issues have to do with what's happening.
- Limit offsets are just used to coincide Mach DROs to a mechanical dial in the machine axis.
- It is a Bridgeport mill with 18x12x5" axis travels,
"You seem to have the jogging keys (keyboard) configured the opposite of normal, this may be intentional but just wondering?" // Just changed them to have right key move table to the right (and not the tool).
- Macropump is just for forcing softlimit on. Already disabled macropump in general conf and restarted with same results.
- I also have a macro but it's used only when ref homing.

BTW, the exact stop mode entering doesn't happen if I just jog away instead of giving mdi command.

Derek, same thing even if G64 explicit is in the program.

Luis

19

General Mach Discussion / Re: Strange problem: goes exact mode after mdi

« on: March 26, 2011, 12:49:00 PM »

This is the code and the xml.
To be clear on what I am doing is the following:
1. Start the program (runs in CV mode)
2. Press hold and stop or single step to stop movement.
3. Go to MDI and run G0 X0Y0Z0
4. Hit Cycle Start again
5. The movement resumes but moves as in Exact Stop mode.

I am noticing now also that I am not getting the preparational move screen. Shouldn't I?

Luis

20

General Mach Discussion / Strange problem: goes exact mode after mdi

« on: March 26, 2011, 11:59:51 AM »

Hi!
I have this really strange problem that I've never noticed before.
I am running a code. I stop the run by either by pressing single step or hold buttons.  Make a G00 move in MDI.  Resume the program with Cycle Start and ....
the program resumes moving as if it was in Exact Stop mode!!  Status shows G64 (CV) but movement is as it would be in Exact Stop mode.

If I change to G61 and back again to G64 everything stays the same. I would need to rewind the program and rerun to get to CV movement again.

Right now I have every CV option in General config unchecked: (plasma mode, distance and angle options)

Any ideas of what could be happening ?
Thanks,
Luis