Interact 1mk2 Y axis Problems

[greg b]

Hi all has anyone out there had this problem with there interact 1mk2 with 2500 heidenhain control,when moving from y positions at maximum
speed the machine errors out and shuts down.I have had the motor of the y axis apart and couldnt see any real issues in there,checked the brushes all good,infact it all looked to be as new,one thing I have noticed is the motor sounds totally differant to the x axis motor when at full speed in motion.I have also checked that the table is not to tight on the gibbs and there is no problem if I change the parrameter on that axis from 5000 to 3000 .I will try and insert a picture of the error if anyone can help this would be much appreciated.Greg.

[gus]

The error implies an encoder problem, but that ought to happen at almost all speeds.

retweek the servos at the proper feed parameter and see if it continues

[greg b]

Thanks for your reply Gus but I dont understand the term retweek the servos.The only thing I could see with the encoder was a very small wobble in it but im assuming it has always been like it because there was never a problem with it before.

[parshad.r]

It seems bearing of motor is damage. please check it it may create serious problem

[gus]

The procedure has been posted here in the past do a search.

Find a manual for your machine

[gus]

tweaking[tweeking] bosch servos on an heidenhain

fool the control door interlock to turn on power with door open
find the "subject" axis servo amp, there is a pot marked 'tacho'

write a program running the subject axis at rapid to near its limits in a continuous loop.

you should set the parameter feedrate to what you want them to be [was it 5000 m/m...] you may want to leave the z a little lower, it doesn't hurt you much and I always had trouble keeping them reliably fast


enable trailing error mode[thru mod key]

the control now shows you trailing error rather than position

turn feedrate pot down and run the program, turn it up to a point at which it will run reliably.
pull the contol around so you can see it while you turn the tacho pot. adjust the pot to get as near zero trailing error at the center of travel[tricky on z]

turn the pot up some and repeat.

it should be subtle changes, maybe a turn max.


If it will not settle or if the trailing error is random and noisy, you may have other problems, like a dirty tach.

trailing error should rise on accel and decel, stabilize in the middle, drop to near zero as it comes to a stop

[greg b]

Thanks for your time Gus I will take a look at these settings I guess I need to also take a closer look at the motor as this seemed to happen over a very short period.

[mark562]

I have the same problem with the X axis on my mk2/TNC155 for the past month or so. Replacing the the motor and drive and several attemps to "retweak" per Gus's instructions have failed.

I have finaly set both axis parameters to 3000 so I get round holes again and still looking for a solution.


Heres a link to my thread.
http://www.cnczone.com/forums/bridge...ing_error.html

Mark

[greg b]

Thanks for your reply Mark,its a frustrating problem alright,I have done exactly the same thing set the x axis to 5000 and y to 3000 and it only plays up very rarely now,the thing i cant get my head around is why should there be any ajustments if everything was fine a few months ago.I can fully understand if there were new parts fitted ,that they may need tuning but this is a bit puzzeling as it seems to be masking another problem.Im glad you tried another working motor as that appears to have taken the motor out of the equation.Let me know if you find anything else regards Greg.

[gus]

I bought my R2C3 [US made eq of interact] in 1992, and until 3 years ago it was one of my primary machines. I ran it for many thousands of hours, along with a Wells/heid, Interact, and a BTC converted to a TNC310.

In all of those thousands of hours I had two issues on the R2C3, one required cleaning the Z axis encoder, and the other was having to clean the y axis out on a regular basis because coolant would get into it.

The z axis has always been run a bit slower, and still needs to be cycled when cold to keep it from giving GPE's

Because of the analog nature of the machines, retweaking is a normal regular issue. It may seem like the errors happen suddenly, but in reality they have just drifted to the point where the machine notices them.

A machine may throw random [weekly or monthly] GPE's but if it happened twice in a short time, I would check the trailing error, it takes minutes.

My Interact came without one drive card, but otherwise I have never changed a bosch drive.
I dropped the y axis motor [R2C3]when it was out for cleaning and broke the magnets, requiring it to be changed.

My point is these things are pretty bulletproof, the do not in my opinion display erratic behavior.

If tweaking the tach is ineffective, clean the tach armature and brushes. If that doesn't work swap axis, the problem will follow an axis or drive.

axis measuring system defective is different from GPE and is fairly rare in my experience

[greg b]

Hey Gus finally got to have a poke around my bridgeport to see if I could stop it from error out in the y axis at max speed,I went into the mode key but could only find lag,but the machine wont fire up while im in this mode.Am I doing something wrong,I also looked around for the tach pot is this on the main Ktk board the one I was looking at looked to be digital but im thinking this is for the spindel.Also around the same time this started to play up the machine went a bit out of wack machining round holes in helical mode so I adjusted that in the parrameters but it is only accurate at 90 deg to one another, in between that shes all over the place,the weird thing is it machines square pockets near perfect?Any input as always is appreciated.regards Greg.