Problem- Haas sl20 2005

[ashro]

Hi All.

Ive had this machine from new, only snag ive got with it is x dia varies slightly.
Ive spoken to many haas engineers and they tell me its to do woth the thermol setting, they did change some settings in the 1st month of me having machine as x dia used to change upto .005
I find now it changes .001 now and again and they tell me all the haas cnc lathes do this.
Sounds silly but if i get something with a.0005 tol i have to put it on my mazak QSH10 cnc lathe as this machine is so stable.

Baring in mind my mazak is over 25 years old and kills the haas for accuracy.

This would put me off buying another haas as you can imagine i waste so much time checking parts to make sure it hasnt changed and the amount i have to throw out, just not good.
My single spindle cam autos hold better tolerance than this SL20 and they are 50 years old + lol true though


Anybody else suffer from x dia changing??

Thanks

[SanDiegoCNC]

Originally Posted by ashro Hi All. Ive had this machine from new, only snag ive got with it is x dia varies slightly. Ive spoken to many haas engineers and they tell me its to do woth the thermol setting, they did change some settings in the 1st month of me having machine as x dia used to change upto .005 I find now it changes .001 now and again and they tell me all the haas cnc lathes do this. Sounds silly but if i get something with a.0005 tol i have to put it on my mazak QSH10 cnc lathe as this machine is so stable. Baring in mind my mazak is over 25 years old and kills the haas for accuracy. This would put me off buying another haas as you can imagine i waste so much time checking parts to make sure it hasnt changed and the amount i have to throw out, just not good. My single spindle cam autos hold better tolerance than this SL20 and they are 50 years old + lol true though Anybody else suffer from x dia changing?? Thanks

When I had a machine shop, I would keep a 'warm-up' program in the controller. Every morning, I would load the program on my cnc mill and lathe and let them run for about 15 minutes before cutting my first part. Just a thought.

[patnok]

Typical, Our new SL-10 is .004 small EVERY morning. In X never in Z. Thermal comp is weird. I don't use it anymore. It only gave me .002 & I need .004. I use a warm up prog & then check the 1st part. put -.004 (every day) in the tool wear & all is good. Depending on ambient temp it takes about a hour or so to get back to where it was the day before. By then I'm changing inserts........I'm in FLA without A/C. We'll see what the "cooler" temperature brings. A real pain if the tolerances are tight. :=(

[roundman]

Well that is true about the 10. I obviously have a good setting because we have not changed it. I have noticed that when I run a lot of parts one right after the other I must check from time to time as required by our papaerwork QC requirements. I check critical dimensions. It will move some if it cools down so sometimes I guess I do back it off when it is close tolerance. I know when it is good you keep it warm by keeping it running without and downtime between parts. I have stuck to this principle on Mazak and Haas. I have been told these Haas don't need warmup period. I have seen such persons also running warm up programs on occasion. Its funny.

[Stifler51]

odd, on the SL20s i run i can puke out parts all day, opt stop, estop off, come back the next morning start it up, let it pop out a part and usually right where i left it the day before maybe a .0001 or so change.

[ashro]

x dia goes up and down through the day, some mornings i start the machine up and it can give the exactly the same reading as i left it the night before and other morning its can be different.
if im threading it can run fine for hours then ill check another part and the nogo gauge will go in, i will then adjust wear offset and fine for few hours then may do it again.
i go through the day adjusting all the time which isnt right, i would like to run the machine over night unmanned but have no trust in it.

it has been pretty reliable since i bought it new in 2005 but dont think i would buy another one.

my mazak and hitachi just feel so much better machines all round.

whats your thoughts on your haas?

[Geof]

Originally Posted by ashro .....whats your thoughts on your haas?

I have two HL1s, two SL10s and two GT20s running production work.

When the tolerance is +/-0.001" they are fine just using a 10 to 20 warm up program in the morning.

We do some parts where we need +/- 0.0002" and then they need a bit of attention to tweak things as they warm up and after lunch break.

Overall though, I am happy with Haas; the initial cost is very bearable and in my experience they run for thousands of hours without significant maintenance.

[haastec]

There is a parameter to turn on/off x axis thermal compensation which I would recommend turning off and seeing if that helps. I don't have the parameter number available at this time, sorry. Shop environments vary quite a bit for temperature so I would also recommend running a warm up cycle when the machine is cold.

Hope this does the trick and keep us posted on your results.

[ashro]

Thanks all.

I would be interested in the parameter which turns ot off.

Thanks again

[haastec]

Found the Parameter.

Parameter 266 X Switches Bit 3: TH SNSR COMP.

Set this parameter to zero to turn off thermal comp in X-Axis.

Hope this helps.

[ashro]

Originally Posted by haastec Found the Parameter. Parameter 266 X Switches Bit 3: TH SNSR COMP. Set this parameter to zero to turn off thermal comp in X-Axis. Hope this helps.

Thanks for your time.
when i have tried it i will let you know.

Thanks again

[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