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Author Topic: g94/95 feed problem  (Read 7451 times)

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Offline dresda

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g94/95 feed problem
« on: January 21, 2013, 09:17:48 PM »
In g94 inch/min in mdi I command g01 z1.f10. no problem, if I command g01 z1. and don't put a F command I get an error saying feed rate not commanded which is correct.
In G95 inch/rev start spindle and input g01 z1. f.010 and I get .010/rev no problem. Now if I input g01z1. and forget to put an F command the machine moves at about 50"/min to the postion and says "simulated feed no spindle feed back" Don't understand...where does this come from?
Ray.

Offline RICH

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Re: g94/95 feed problem
« Reply #1 on: January 22, 2013, 07:04:56 AM »
G95 requires a G32 so that an index is seen, no index seen no movement since Mach is waiting to verify the index.
RICH

MODIFIED: G32 will change the feedrate mode from G94 to G95 and acticvates  a call for Mach wanting to see a index when used for threading
on the lathe.
« Last Edit: January 23, 2013, 06:38:03 AM by RICH »

Offline dresda

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Re: g94/95 feed problem
« Reply #2 on: January 22, 2013, 02:38:19 PM »
You say no g32 no movement so why do I get movement at a simulated feed of about 50"/min when I just command S command and g95 and a Z move with no F.
It will not be the first or the last time I forgot to put a feed, just need to know if it's DSPMC or mach, still wonder about the integration.

Offline RICH

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Re: g94/95 feed problem
« Reply #3 on: January 22, 2013, 06:36:57 PM »
Sorry, didn't realize you were using an external motion device.
RICH

Offline dresda

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Re: g94/95 feed problem
« Reply #4 on: January 22, 2013, 06:58:36 PM »
Sorry..

Offline RICH

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Re: g94/95 feed problem
« Reply #5 on: January 23, 2013, 07:05:21 AM »
G94 is Modal so you comand G95 for the feedarte to be units per revolution.

If no feedrate is given you get an error as you noted ( think the message is a little different than what you posted).
While in G95 mode you will get movement but if no feedrate was given the movement is "simulated" as Mach has no basis for the feedrate.  ie; other modal groups which can be in effect.

Maybe someone else can be more definitive.
 
RICH

Offline dresda

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Re: g94/95 feed problem
« Reply #6 on: January 23, 2013, 02:01:25 PM »
Rich I can understand if it was in program and lets say the last feedrate was a g01 f.050" and was modal, then my next line could read ( and I'm still in g95) s200 z move with F command so it would pick up the last f command but I was using mdi with only one line of info, g95s200 m03 z1. and it moved 1. at about 50"/min.
I am going to start again from scratch and make sure there are no previous feedrates in the system. I have been fixing this stuff for almost 40 years on the mechanical side and with Fanuc etc, don't know crap when it comes to PC systems. I am trying to compare mach to the high end controls but it has to work and not be dangerous, it's very easy to miss a F command when programming manually that's how I make i living.
Ray.
Re: g94/95 feed problem
« Reply #7 on: January 28, 2013, 04:15:13 AM »
>Rich I can understand if it was in program and lets say the last feedrate was a g01 f.050" and was modal, then my next line could read ( and I'm still in g95) s200 z move with F command so it would pick up the last f command but I was using mdi with only one line of info, g95s200 m03 z1. and it moved 1. at about 50"/min.
I am going to start again from scratch and make sure there are no previous feedrates in the system. I have been fixing this stuff for almost 40 years on the mechanical side and with Fanuc etc, don't know crap when it comes to PC systems. I am trying to compare mach to the high end controls but it has to work and not be dangerous, it's very easy to miss a F command when programming manually that's how I make i living.
Ray.<

I dont have dspMC/IP or dont have used one either, but your message above caught my attention; Should the mdi line  g95s200 m03 z1. have also G01 ? If machine is in rapid (G00) state, then its working right if moving at rapid?
Most commercial machines I have used need new feed after new commanded new Sword and G94/G95 + F must be separate line. Still feed is updated even using spindle speed overide pot. Need to check this with Mach3 tomorrow when I get back to the shop.

-M

Offline RICH

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Re: g94/95 feed problem
« Reply #8 on: January 28, 2013, 06:11:50 AM »
Quote
I am trying to compare mach to the high end controls


I can't provide you with a comparison to other controllers.
Sort of like saying what is the difference between all the dialects of Gcode and how do they vary from the NTIS
standard. How about where there is no standard and it's proprietary. The numerous PP's provided by Cam programs
for different controlling programs is a good example of addressing the nuisances. That said, one needs to look at the specific
control manual for guidance. At a higher level of general resource information, Smid's CNC handbook becomes my personal reference, but as noted, there are differences.

RICH


Offline dresda

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Re: g94/95 feed problem
« Reply #9 on: January 28, 2013, 05:46:31 PM »
I used to work with Peter Smid in service and application back in the 80's good guy.
Ray.