Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Greolt on March 01, 2007, 05:04:24 AM
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I have got to the stage where I am doing test runs on my almost completed router.
I have set velocity and acceleration to a conservative level on the Z axis.
When jogging at 100% or doing G0 moves on the MDI screen the Z moves very smoothly.
Then when air cutting the Roadrunner, I can hear that the Z is jumping steps as it ends a move.
It is like it moves too quickly and stops too suddenly. Either up move or down.
Should not the velocity and acceleration as set in Motor Tuning be the overriding limit?
I just had a thought :o Setting the scale up to 10 may have affected this ....... would it ???
If that is so then changing the scale at the DRO discards the motor tuning. Could this be so ???
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Are you running in feed override? If so, do you have no FRO on Queue checked in general config? (Far right Middle) Do you have backlash comp. enabled? What version of Mach are you running?
Brett
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Brett
Yes I was running feed rate override.
No back lash comp.
Version R2.0.040
The "FRO on queue" I can not check now.
It is late and I have come in from the shed before the neighbors complain. ;D
What should it be set to ?
Greg
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Hey Greg,
It is just a box that you put a check mark in. You want to have a check mark in the box.
Brett
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Can you give a description of what it does or does not do Brett
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Not a good one. The FRO means feed rate override. Queue, I don't know. I do know this, it was added in the later versions to fix the problem of Mach trying to run the motors at higer speeds (while in FRO) than set in motor tuning.
Brett
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Hi All, I have recently joined the forum and find it a great source of info. I just opened a query which resulted in a "Mach 3 now working with vista" display which I can't get rid of. Seems to be some sort of malacious code. Any advise other than a sledge hammer? I also managed to bring up the pop up that allows you to control jogging etc (by accident.. had a schematic sheet lying on the keyboard and I don't know what was keyed in to do this.) Any suggestions?
Les
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Hey les,
The tab key should get rid of the MPG screen. I don't know about the other yet.
Brett
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Thanks Brett. I'll give it a try tomorrow.
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Hi Brett, I got rid of it by selecting the main Mach3 sceen but I'm still stuck in single step mode(which was what I was looking for in the first place). Will a tab bring MPG up again? many thanks
Les
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Hi Brett, I just checked and a tab does it all Thanks
Les
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;D
Brett
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Brett
I went to try the "FRO on queue" and had more problems before I even had a chance to see if that fixed it.
When in the middle of cutting the roadrunner (or any file I presume) if I hit feedhold then start
the router wanders off to some imaginary point in the distance and won't stop till it hits a limit or I stop it.
I have no idea whats going on here. :)
Greg
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Further to this problem
I loaded up the latest version. No difference.
Discovered it is when scaling is used.
Turn scaling off and all it starts OK after feedhold
Greg
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Hi, Greg
Feedhold, Still has a lot of problems and is very very complex.
On your DXF files you can load them into LasyCam and scale them there.
You can size the Tab/MPG window down some by moving the left side over to the right, doing this several times with Tab-ing it open adjusting to same spot and closing, it will stay in that spot.
Hope this Helps, Chip
PS: Brett I have put the Fire trucks Back on Alert.
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In normal operation I spose you would generate your gcode in the correct scale.
However because I am only testing my new machine I have just been running the provided Roadrunner.
To get it to run at a realistic size on my machine I have been using scale.
However feedhold does not work when using scale.
Never mind, hopefully I won't need it once I get going. ;D
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Hi:
Feedhold on scale is fioxed now for the next version. Thanks for that report, I had never tried in in scaled mode..
Art
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Thanks for the report Art
That's great. ;D