Problem- Haas sl20 2005

[ashro]

Originally Posted by Haas__man I'm thinking that your problem may not be related to thermal comp. It could be, however you say that sizes go up and down all day? Turn off the thermal comp and see if it makes a difference. If it makes it better, then you will probably find that your x axis temperature sensor is faulty and that would be why your sizes are all over the place. If turning off the thermal comp makes no difference then you could find that the locknut on the bottom of the x axis balllscrew could be loose and allowing unwanted movement sometimes. To check this, remove lower x axis cover. look at lower support bearing end of ballscrew. you will see a locknut with a lock screw. move the axis slowley until you can access the lock screw. undo the lock screw. Now see if you can turn the lock nut. if you can't then it is tight enough - lock up the lock screw again and refit cover. If it is loose then tighten it up - be very careful not to overtighten though - and remember to retighten the locking screw. Hope this helps

thanks for info

a couple of the haas engineers tell me this is quite common with haas lathes.

[Vern Smith]

I purchased a new GT-10 a few months ago and have noticed that x does vary as it warms up. It does seem to stabilize after 10 or 15 minutes of use. A warm up program has been mentioned several times. There was none on the machine when I got it. Can someone suggest one, or might there be one buried in the bowels of the Haas web site?

Vern

[Geof]

Vern;

Write your own.

Start the spindle at 500 rpm and then have a subroutine call. In the subroutine run the X axis to its limit then back home at something like 0.005 IPR maybe three or four times then return to the main program and bump the speed up to 1000 before calling the subroutine again. Do this all the way up to top speed. This will warm up both the spindle and the X ballscrew; leave the Z at home to avoid having any tools hitting anything.

[Vern Smith]

Me write G Code a really scary thought. I'll work on that today and post my results before taking any chances with it crashing the machine.

Vern

[SanDiegoCNC]

Originally Posted by Vern Smith Me write G Code a really scary thought. I'll work on that today and post my results before taking any chances with it crashing the machine. Vern

Here's an old one I use on Mazaks and Haas lathes...

%
O12345 (WARM UP PROGRAM)
(16 SEPT 2005)
G20
G00 T101
G97 S700 M03
G50 S3000
T202
T303
T404
T505
T606
S1200
T707
T808
T909
T1010
T1111
T1212
T101
S1600
T505
T202
T606
T303
T707
S600
T404
T808
T505
T909
T606
T1010
T101
T1111
T303
T1212
S2000
T202
T303
T404
T505
T606
T707
S900
T808
T909
T1010
T1111
T1212
T101
S500
T505
T202
T606
T303
T707
S1800
T404
T808
T505
T909
T606
S2200
T1010
T101
T1111
T303
T1212
M99
%

[SanDiegoCNC]

Use control 'C' to copy the program and then use control 'V' to paste it in a floppy disk as a txt. Insert the floppy disk into your controller to upload.

[Vern Smith]

Thanks for the code. I only have 8 tool positions so I'll have to do a little editing. It doesn't look like you are moving the x axis?

Vern

[SanDiegoCNC]

Originally Posted by Vern Smith Thanks for the code. I only have 8 tool positions so I'll have to do a little editing. It doesn't look like you are moving the x axis? Vern

No, when I turn on the machine tool, I would home the both axis and load the warm up program. I've never had a need to move the turret as part of the warm up process.

[ashro]

Ive been running 2 days now with Thermal comp turned off and the machine has never been so accurate.
From when i turn it on in the morning to when i turn it off on the evening it now seems to hold .0002.

thanks all