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Author Topic: Feedrate Overide Ver 2.25 3 Issues maybe??  (Read 3123 times)

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Feedrate Overide Ver 2.25 3 Issues maybe??
« on: December 11, 2006, 07:56:44 AM »
Art, Version 2.0.025 is great in all respects. I love it all.

Well, except three little things. (Unless they are features, I don't know?)

1) Feed Rate Override will allow anything other than G0 go faster than the max motor speed in Motor Tuning, and so loose steps.

Give this a go, setting FRO to 100%:

G17 G21 G40 G54 G90
N10 G0 X0Y0Z10 F111
N20 G1 X10Y10  F60
N30 G1 X30Y30  F600
N40 G1 X50Y50  F1000
N50 G1 X0Y0    F300
N60 G0 X50Y50  F222
N70 G0 X0Y0    F333
N80 G1 X50Y50  F100
N90 G0 X0Y0    F1234
N100 G0 Z0 F0

Works fine. All G0 are at the max speed (F settings ignored) (400 mm/min on my machine) and any G1 F settings over 400 limit to 400.

Run it again at FRO = 120% (not an unusual setting) and all hell breaks loose. G0 are OK but with G1, any setting over 400 is limited to 400 but then the FRO is applied so I get 480mm/min. At 200% I get 800mm/min and mostly missed steps, ouch.

>>Can the total feed limit, after FRO, please be limited to max motor tuning speed in all cases?? (Or is there a setting I have missed?)

2) Look at line N80. (With FRO back at 100%.) F is F100 which is fine but "feed hold" during this path then "Start" again and the feedrate is now max speed (400) and I have a broken tool. Am I doing something wrong? Can it continue at the same feedrate as it was doing please?

3) The feedrate in the "Feedrate" box is not the feedrate of the line the machine is performing. Sometimes it is the next line, sometime a line much later in the file. Is this correct? Can it display the actual line the machine is working on as the FRO displayed is then also not correct for that line?? (Tested with G0 feedrates removed!)

Thanks for your consideration. (I've almost spoilt a few pieces with these points.)


Offline Chaoticone

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Re: Feedrate Overide Ver 2.25 3 Issues maybe??
« Reply #1 on: December 11, 2006, 08:17:32 AM »
Hi Richard,
    I think the first two may be bugs. On the third, are you running in CV mode or exact stop? I think this will have some bearing on the problem. While in CV Mach has to do the Math before it actually runs it. Let someone else confirm this though, this is only my best guess.

;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: Feedrate Overide Ver 2.25 3 Issues maybe??
« Reply #2 on: December 11, 2006, 08:55:30 AM »
1. Us No FOR On Q in the settings page and that will stop that problem.. The problem is more complex then you think :(

2. This should have been fixed in this version... Art has been putting time into that section of code and I have told him about your experience

3. Nope, this is a problem with CV :( The planner is working in the future and you are seeing where the planner is setting the new feedrate. This can be fixed on the external movement devices but not for the printer port :( Once again we are looking into making this better but it is no simple task.
Fixing problems one post at a time ;)

Re: Feedrate Overide Ver 2.25 3 Issues maybe??
« Reply #3 on: December 11, 2006, 08:09:58 PM »
Thanks Brian 8)

1) OK, I will try that - I wondered what that did!

2) I tried Monday's download (25) and still had that problem (version 20 also messed up arcs during feedhold - not checked that on 25).

3) Ah, I thought it might be something like that. But 25 does it in CV and exact stop which surprised me. Anyway, not a big problem.

I would be really grateful if 2) could be fixed, otherwise we can't safely use feedhold.

Now Mach is 100% stable on my PC, with my home made machine (made mostly of wood!) I am making things I never thought possible like name stamps and a little plastic rotary Wankle demonstration engine - very complex profiles and even internal gears, all cut with Mach3 and very small cutters. I'm learning a lot, thank you all. :D