Messages

141

General Mach Discussion / Re: feedrate changing after spindle stop part 2

« on: June 21, 2015, 08:22:28 AM »

Br549-- a last question
I am not calling css in the code but the initstring is using "constant velocity"

Is this the same thing - any wat i have changed it to exact stop to see what happens

regards

fred

142

General Mach Discussion / Re: feedrate changing after spindle stop part 2

« on: June 21, 2015, 08:15:39 AM »

thanks BR540- seems that is what is causing my concern

the configuration is set a 25000 and when i look at the diags the reported speed is 23800( or thereabouts)

could this be the cause ?

This whole problem has led to me doing quite a lot of research and for anyone else who
may be interested in the topis take a look at  "Google Mach3 feedrate " ther are many posts about the same thing.

thank you all very much - i think this answers my queries.

regards from South africa

143

General Mach Discussion / Re: is restart nessessary after edit?

« on: June 20, 2015, 04:16:31 AM »

thanks TP

144

General Mach Discussion / Re: feedrate changing after spindle stop part 2

« on: June 19, 2015, 11:15:17 AM »

further observation on the same topic.
I have taken the fword out of the setup string.
when i load mach3 from scratch  the feed dro shows "6"
where does it get this value from ? is this a built-in default?

145

General Mach Discussion / is restart nessessary after edit?

« on: June 19, 2015, 11:11:57 AM »

Hello chaps
probably a stupid question but here goes

while running code in the autocycle mode if I stop the program using "stop"
and then edit the code. I then resave the code and it overwrites the code in memory.

At that point is it nessessary to restart mach3 ? or can i safely just rewing and start over again?

regards

fred
 

146

General Mach Discussion / Re: feedrate changing after spindle stop part 2

« on: June 19, 2015, 11:07:42 AM »

Br549--
 thanks  I  changed to feed per minute and there was an immediate improvement.

However still not quite right.
the earlier f call was for f1.0
because this was so slow i changed to f25
when running with f25 the DRO reading is showing feed = 23.28
much improved ove the earlier reading with using feed per rev but still not
quite right.
Is it normal for the feedrate to be a few points below what is specified in the
f word??

147

General Mach Discussion / Re: feedrate changing after spindle stop part 2

« on: June 19, 2015, 07:52:23 AM »

Will try when I get home this afternoon

(wotis FPR?)

148

General Mach Discussion / Re: feedrate changing after spindle stop part 2

« on: June 18, 2015, 01:55:30 PM »

Hello TP - thanks for the input

I think i might of found something.

It appears to me that when i enter a G01 command the feed rate is halved.

Is there any switch which could be applying a 50% to the feedrate??

I take note of your suggestion that mach3 may be corrupt- but i have just upgraded to
the latest version downloaded from the artsoft site and the problem persists.
I ran some other code that i know was working previously when I machined a lot of plastic
blocks to rounds and it worked fine. then i saw that the code was calling F1 ( 1mm cut per rev)
when i changed this F to f0.1 i got the same problem the feed rate was halved to 0.04 on the DRO
so i changed the code back to f1 and lo and behold when i ran it this time the dro registered .4
again about half what i was calling for.
strange?? I am going to bed now and will sleep on the problem until tomorrow night.

regards and goodnight.

fred


South africa is freezing at the moment . When i drove to work this morning it was down to
5 degrees  :-)

149

General Mach Discussion / Re: feedrate changing after spindle stop part 2

« on: June 18, 2015, 12:15:19 PM »

Thanks chaps -- i will rewrite the code and try a few more tricks

i will report back to this topic if i sort the problem out.

first thing i will do is to reduce the code to bare bones ( no subs etc) and see what happens

best regards and thanks
fred

150

General Mach Discussion / Re: feedrate changing after spindle stop part 2

« on: June 18, 2015, 03:54:22 AM »

I'm back again.
I upgraded to the latest version and I still experience the same problem.

Please tell me if my logic is sound.
The problem is that whenever I call a G01 move  the f value is changed
from the f setting on f=0.1 to f=0.04 ( or f=0.05)

My first thought was that I had a corruption in the code. so i went through the code carefully
and couldnt find any command which would affect the feedrate.
Then I thought that maybe there was a corruption in my Mach exe . I then reininstalled
the latest version and still have the same problem.
Having TPS try the code on his machine shows that the code and the exe are both working OK
therefore the problem must be something to do with the configuration that i am using.

I dont know how to attack the problem.

Any advice will be appreciated.
regards

fred