Re: Okuma VMC Model MB56VBR
...if your machine uses Belleville washers on the drawbar...possibly some may be broken
https://en.wikipedia.org/wiki/Belleville_washer
https://www.cnczone.com/forums/showt...0CNC%20Drawbar
Check your parts manual maybe,
DJ
Re: Okuma VMC Model MB56VBR
Thanks for your response. Coiled springs (1 set = 2 numbers) being used not Belleville washers in this machine, we had checked and found both of them to be ok in terms of Spring force as checked manually by hand and also grease etc
Now trying to check and operate cylinder externally to find out in case of any internal leakage - not very sure although
Re: Okuma VMC Model MB56VBR
Dear Experts
Pl refer to previous thread regarding tool unclamp issue
1. Tool unclamp cylinder checked externally with air pressure found ok
2. As u r aware, there are two spacers on drawbar in line with coiled springs, we found width of both spacers to be more vis a vis one more drawbar in stock
3. Replaced new drawbar
4. As u r aware, there is an input called "unclamp cylinder retract confirm" which should be ON during clamp - somehow we have doubt that, this input was malfunctioning & thereby unclamp stroke was getting interrupted - please revert if that is possible, because we did not find much of abnormality in the entire assembly of course except width of spacer
5. Please let us know on how to check ladder for output for tool unclamp to see of this can get interrupted due to input called "unclamp cylinder retract confirm"
At the moment machine is ok but under observation
Thank you so much for all your support of members of this forum
Regards
Re: Okuma VMC Model MB56VBR
In your maintenance manual there should be logic diagrams for the tool changer that show the sequence of events and the inputs that need to be made in each case. Before an alarm occurs, you have 3 minutes that you can look at the DIAGNOSIS page to see what the error is or what it is looking for. Based on your description, you may need a slight adjustment in either your draw bar stroke or in your proximity switch. Your not so local rep may be able to give you some pointers on Draw bar adjustments or have a procedure they can send you. It sounds like yo have already thoroughly cleaned the entire mechanism?