spindle brake??

[murphdog]

Hello,
Running a repetitive operation on a 2001 SL20 @ 3500 rpm. Is there a way to make the spindle come to a stop any faster than a M01 or M30 does?
Thanks
Murphdog

[KenFoulks]

Please post the program and the serial number so I can look at your configuration. You can pm the serial number if you want.

[txcncman]

Assuming you are taking the time to move the turret back to a safe tool change position, switch to G97 during this move. Use a low RPM, like S400. Then when you hit M0, M1, or M30, the spindle will have less kinetic energy.

[murphdog]

Ken,
The serial is 64278. The program is as follows.
Thanks

%
O1 ( Lathe Trace )


G20

G00 T202
G97 S3750 M03

G00 G54 X0.75 Z0.1
G01 Z0.005 F0.015

G01 X3.75 F0.018

G00 Z0.025
M97 P1

G00 G54 X6. Z2.

M00 (flip part to milled side out)

G00 T202
G97 S3750 M03

M97 P1

G00 G54 X6. Z2.

M30


N1
G00 X3.066 Z0.025

G99 G01 X3.8199 Z-0.019 F0.018
G00 Z-0.0442
G01 X2.634 Z0.0249
G00 X2.2019
G01 X3.8199 Z-0.0694
G00 Z-0.0945
G01 X1.7698 Z0.0249
G00 X1.3378
G01 X3.8199 Z-0.1197

N2
(FINISH PATH)
G00 Z-0.1449

G01 X1.3355 Z-0.0001 F0.0055
G02 X1.3313 Z0. R0.0156
G01 X0.9604
G02 X0.9312 Z-0.006 R0.0206
G01 X0.8842 Z-0.0296

G00 Z1.
M99

%

[KenFoulks]

Assuming you are taking the time to move the turret back to a safe tool change position, switch to G97 during this move. Use a low RPM, like S400. Then when you hit M0, M1, or M30, the spindle will have less kinetic energy.

+1

Place a G97 S250 M03 before the G00 G54 X6. Z2.and you should be good to go.

Also, why aren't you using G96?

[Geof]

The suggestion to slow the spindle down to S250 before the retract move and the M00 puzzles me.

It is going to take some time to slow the spindle from 3750 down to 250 and when this time is added to the time to stop from 250 it will probably be about the same as stopping directly from 3750.

[txcncman]

Maybe you are correct. Maybe adding the G97 to the code will take just as long. I am betting it won't take as long. I am also betting the time savings per cycle will be less than 10 seconds. Might even be less than 6 seconds. I do not have a Haas SL20 here to test it on.

What can it hurt to try it until another solution is found?

(The definition of stupidity is doing the exact same thing over and over and expecting different results.)

[murphdog]

Hello All,
We are not running constant surface speed. At the tip of the part we are facing off we are at approximately 3750 SFM now.
SO!
Per TXCNCMAN's reply we put a S400 in as below.
S400,
G00 G54 X6. Z2.,
M00,
This was worth another 4 seconds. 33 down to 29
Our conclusion was that since spindle started slowing down BEFORE the rapid move it was at a slower speed when M00 shows up. Therefore we have less RPM's to slow down from at the M00.
320 parts x 4 seconds = 21.3 minutes. I can be home and having a cocktail in that time. OR doing something else more productive!

[Al_The_Man]

Is there no parameters that can be changed in the drive for deceleration?
Increase dynamic braking etc?
Many controls look for both up to speed and at zero speed before completing the spindle stop commands.
Al.

[Geof]

I hade a look and only found Parameter 196 ACCEL LIMIT LOAD which is set at 195% out of the factory. So I guess you don't have much room to play with that seeing as how the machine alarms out at 200%.

[gizmo_454]

Assuming you are taking the time to move the turret back to a safe tool change position, switch to G97 during this move. Use a low RPM, like S400. Then when you hit M0, M1, or M30, the spindle will have less kinetic energy.

+1

That's what I do! Works wonders when making thousands of parts!

Mike

[fseeley13]

To stop the spindle i've always used and M05, M11 and then if i needed to flip the part around i would use a G04 P2. to dwell. set the part back in, and use a M10 to reclamp and continue running your program.