[adaptaflex]

Hi All
Can anyone help me. I am not a CNC programmer nor do I pretend to know much about the subject.
We have some Mori seiki lathes with 3 metre bar feeders,producing small components we want to increase the cycle times per component but we are limited on spindle rpm when we have a complete 3 meter bar due to bar vibration etc. However when the bar is down to half its length we are able to considerably increase the feed & speed and increase cycle times.
My question is.....
Can this be done automatically within the machine program?
ie we count cycles (components) that equal half the bar length then when the count is reached we increase the speed and feed rates previously set in a "sub-routine?" Just really wanted to know is this a go or a no go idea?

Thank you
Mark

[codyst]

You could do it with a G65 call

G65 P(program #) L (Repetition count)

or you could do it with macro if you have macro enabled:
N1
IF[#500LT10]GOTO2
IF[#500GE10]GOTO3
IF[#500EQ20]GOTO4
N2
CUTTING PROGRAM SLOW FEEDS/SPEEDS
#500=#500+1
GOTO1 (Loops until program equals preset for half of your bar)
N3
CUTTING PROGRAM HIGH FEED/SPEED
#500=#500+1
GOTO1 (Loops program until stock is gone)
N4
#500=0 (Reset Count before starting loop for new stock)
M30

Or, you could program your feeds and speeds in macro also

N1
#501=Spindle Speed
#502=Feedrate
N2
IF[#500LT10]GOTO3
IF[#500GE10]GOTO4
N8
IF[#500GE10]GOTO5
IF[#500EQ20]GOTO6
N3
M3S#501
G01X000.000F#502
#500=#500+1
GOTO2
N4
#501=[#501*2](DOUBLE SPINDLE SPEED)
#502=[#502*2](DOUBLE FEEDRATE)
#505=1
GOTO5
N5
M3S#501
G01X000.000F#502
#500=#500+1
GOTO7
N7
IF[#505=1]GOTO8
N6
#500=0
#505=0
M30

[grweldon]

Codyst gave a great programming method to solve the problem, but seeing that you are not a programmer or know much about CNC in general, it might be best to solve your bar problems by mechanical methods!

If you can support/clamp the long end of the bar that sticks out (assuming it's long enough and at 9+ feet, I'd say it is) you can minimize the "whipping" effect of the end of the bar. Some sort of stand bolted to the floor wth adjustable bearings such as a steady rest can be used. In fact, if you have an old steady rest in your shop that's never used, you could modify it to work.

[adaptaflex]

Hi Guys, thanks for the help although I am not a programmer I have setters that will understand any programming soloutions you may offer.