Faulty Vernier

[ColinG]

Hi

I'm running a Komori L640 and we're having problems with the circumferential vernier on the 3rd unit. It keeps moving on it's own by up to 1.5 to 2 mm. It doesn't move while the press is running but when the press goes off impression at the end of the stack when it is re-started the register has moved and has to be re-positioned resulting in spoilage at the begining of each stack. Has anyone else had this fault and can you give any advice on what is the likely cause. I've checked the four locking bolts on the side of the cylinder are tight. Thanks Colin G

 

[kmoimt]

Does your press have a gauge and lockring on the cylinder is that what is moving?
If you try to move the cylinder with a prybar in a direction of operator side to gear side and vice versa does the cylinder move?
You may have some endplay in the bearings on the threaded shaft assembly!

 

[ColinG]

Does your press have a gauge and lockring on the cylinder is that what is moving?
If you try to move the cylinder with a prybar in a direction of operator side to gear side and vice versa does the cylinder move?
You may have some endplay in the bearings on the threaded shaft assembly!

Hi kmoint. Thanks for the reply.
There is no gauge or lockring. The vernier is moved from the console. We've tried swapping the motor and the encoder with another unit but the fault stayed on the 3rd unit.

 

[kmoimt]

It sounds like a backlash problem, really you should take it apart as an assembly and inspect it , maybe you lost some bearings.Once you have it off the press you can then reset the backlash if nothing else is wrong
I think you should bring in a tech

 

[raypollock]

Hi,
did you manage to get to the bottom of this problem?


Ray

 

[ColinG]

Hi Ray

Thanks for asking but the problem is still to be fixed. In the meantime I've just been trying to avoid using the faulty unit. I think we need to bring someone in to have a look at it but I'm still waiting for my employer to decide what to do.

 

[raypollock]

Hi Colin,
probably best to get an engineer in, if you get time remove the cover where the faulty vernier is and have a look for metal cuttings in the oil and on horizontal surfaces under the vernier mechanism.