[Joey]

I`m having problems with the turret rotation.
When running a program recently the Tool call for station 1 resulted in the turret rotating into position but not locking into place, I`d receive a timeout error and the program would stop. If I then went into jog mode and rotated the turret manually once, then go back to program and restart on Tool 1 it would rotate and run ok.
This also happened on Tool 10..
At times even calling Tool 1 or 10 under MDI would also result in the turret not locking into place.
Occasionally using the Jog mode the turret would not stop spinning !!

We had a service tech in but has not found the problem. He went off trying to find if there are any parameters that could be altered, his thinking being that as the machine is only a couple of months old, perhaps the turret positioning sensor is set too fine and he`d like to try relax the tolerances within the parameters before stripping the machine to look for mechanical problems.

Can anyone offer any help on this please.

Another question I have is the driven tooling mechanism.
I was using a single flute boring bar for a tight tolerance hole and needed to rotate the tool in order to set the size using a clock gauge, but there is no way I can find to disengage/turn off the drive.

Thanks for any advice

[M-man]

While c-axis mode, you should be able to rotate the live tool by hand, just as ju can rotate the chuck by hand during turning mode..

[latheman]

Just a suggestion we have a Daewoo lathe that had same problem. Check to see if the proximity switch has a chip on it. It will unlock the turret but will not index. I don't know, it may help you would be amazed at some of the stupid things these machines will do.

[jackson]

i had a lathe do that mine required the turret be removed and re keyed and they recomended that since it was old try keeping it ballanced by equaling out your tools on the turret

[Joey]

I appreciate your suggestions, thanks guys

M-man that sounds good, I`ll definately give it a try.. cheers

[xavierdemoura]

Joey,

I work whith these machines in my country (BRAZIL). Here, we has tha same problem whith the same machine. Only one thing solve the problem. Do an correct balance of tools in your turret. If you don´t do that, you will have always these problem. When the turret goes to the position, and when stay in the position, the control cut off power of the motor, and has one time to clamp the turret. If the turret not stay in the balance, and the control cut off the power of the motor, the machine will clamp the turret in wrong position, so gives an alarm.

See the balance first, if is no ok, tells me, i will send an parameter to you decrease the velocity of turret.

Daniel

[Joey]

hi xavierdemoura thanks for the help.

Ok I will look for turret balance,
the turret speed decrease looks like a good option for me as cycle time is not so important here. Please send the parameter to change

thanks again

[xavierdemoura]

Joey,

I don´t remenber very well, but these kind of machine has 10 turret position. Put one tool for OD and another to ID, OD to ID. Do these to complete all positions. If you are using an milling tool, in the other side out an ID holder. It´s the same weight of an milling tool. Second way, i need know if the amplifier of turret is an Beta or Alpha !!! See in the eletrical gabinet !!! If you has any question, see in the parameters if has an PMM softkey. Do these steps. Put the machine in MDI mode, press SYSTEM, ARROW Softkey, and search PMM softkey. If the machine has Beta amplifier, it´s possible you find PARAM softkey. Confirm that to me !!!

Best Regards,

Daniel

[Joey]

Yes I found a PMM softkey
It shows the following when pressed :-

Group3/B (this B looks like handwritten beta sign)

System (Series/Version) 88A1 15

[xavierdemoura]

Joey,

Go to parameter screen in PMM softkey !!! Change the parameters 43 to 50 !!! These parameters are the feedrate of the turret !!! Maybe 44 to 50 are the same and only 43 is diferent. I think that values are 43=2200 and 44 to 50 = 2000. Decrease all values to 1500 and do an test. But, don´t forget, balance the tools is very important too.

Daniel

[theemudracer]

I have the same exact problem with my kia SKT250MS. My turret is not balanced very good. Sometimes after a tool change it will just stop. The green light goes out and the red comes on like somebody pressed cycle stop, but it gives no alarm when this happens. hit cycle start and it takes right back off like nothing happened.

[xavierdemoura]

Theemudracer,

These occurs because, for example, the turret stay in the position 1 and you need turn to position 5. The turret is not balanced. The turret unclamp, power in the motor, turn to position, cut off the motor, and so clamp. If the weight of one side is more then other side, in these second of cut off the motor, the turret turn a litle. These is enough to go out of position and give an alarm, or cycle stop. The motor in the turret don´t has brake. Probally, if you decrease the timer the clamp the turret, you will give an alarm number, and not only cycle stop.

Daniel

[Joey]

hi xavierdemoura
yes I found the ppm parameter page but I have been asked to wait until the service tech comes back before I try and change it.
Actually the machine has been behaving itself for the last 2 days and I haven`t had the problem.
I`ll let you know what happens.

thanks again

[M-man]

Couldnt it be something to do with sensor that checks the index of the livetooling driveshaft before doing a tool change. Mabe there are chips or something that makes the sensor active during spindle mode tool change???
If you manually unlock the turret and it is so unbalanced so a tool change doesnt work, wouldnt the toolpost with this hight weigt spin "down" ?

[theemudracer]

Yes your right. When I manually unlock the turret, You have to be careful because it will spin rather quickly down if it is heavy on the top. Best thing to do is stand back and let it swing and then position it afer you have control of it.

The live tooling motor has an encoder on it to position the driveshaft for tool changes.

I overloaded the Live tool motor and jump a gog or two on the belt and had to adjust a parameter to re-align the live tooling drive shaft so it would tool change.

Jon

[Joey]

hi M-man, Yeah it could quite easily be chips interfering with the sensor. No matter how clean I try keep the tool pockets there always seems to be a few stray chips about.


Going back to

While c-axis mode, you should be able to rotate the live tool by hand

I tried that in MDI but it never worked. does it need more code than just M43;
or M143; for A axis


How do you manually unlock/lock the turret ?

[theemudracer]

To manually unlock the turret. Do the following steps.

MDI
PWE

Turn Keeprelay K5 bit 0 to 1

Turret adjust mode is displayed on the screen.

In MDI mode press Spindle select,spindle stop, and motion stop at the same time. You have to hit all three buttons at the same time for this to work.

To Lock turret, press the "call/bz off" button after the turret is lined up at the number one position with the dots.

Turn the Keeprelay back to 0 when done.

Then press the other select button on the lower right hand side of the controller and the spindle stop, and motion stop at the same time to re-teach it the number 1 position.

This is all in the Kia manual if you need it under maintence and preservation.


Jon

[Joey]

Thanks a bunch Jon
that could come in handy sometime

[Joey]

The service tech guy finally fixed it.
He said it was the driven tooling mechanism inside the turret being slightly out radially, so when the turret rotated the `tang` part of the tooling holder forced itself into position, fighting against the driven tool servo motor, this caused the turret dog not to reach its switch properly.
He modified the servo motor encoder position.
Seems ok now.

Tnx for all your help again guys.

[theemudracer]

Write that parameter down for the encoder position on the live tools.

If you ever overload a live tool hard it will need adjusting....Been there and done that....

Now I now how to fix it myself.


Jon