Hi Folks,
This is my first post on this forum, thanks in advance for any help you can give. I am in charge of maintenance at a machine shop that specializes in precision grinding. I used to build new machinery for the textile industry, so maintenance on this type of machinery is fairly new to me although I am very mechanically inclined (if I may say so myself, lol). I have been here just over a year now and have learned a lot in that time.
On our large Mattison horizontal spindle surface grinder the operator is suddenly getting a chatter pattern in his parts. He had been grinding the exact same parts/material earlier in the day and getting a great finish.
We have already covered a lot of the common issues I found in this forum such as wheel balance, dressing, glazing. All ways appear to be getting plenty of lubrication. He is an experienced operator. He has been running this machine for over 5 years, so I have to trust in his ability to dress properly and know if the wheel is clogged or out of balance.
I pulled the wheel sleeve off and checked the spindle for run-out, we had about .0005" total. I tried pulling up and pushing down on the spindle itself, but saw almost no play.
In the trouble shooting section of the manual it suggests that the cross feed gib could be loose. I located the gib and upon inspection found that I could put a .005" feeler gauge between the front gib and the way. This seems like to much to me, but I can not find an adjustment procedure. The rear gib will not allow even a .003" feeler gauge to enter.
I was going to adjust the front gib just to see if I could close up that gap, but no matter which way I adjust it the gap remains about the same.
I do have a call in to our local machine repair guys and I am waiting to hear back from them. In the mean time I figured I would see if anyone had any suggestions here.
This is my first post on this forum, thanks in advance for any help you can give. I am in charge of maintenance at a machine shop that specializes in precision grinding. I used to build new machinery for the textile industry, so maintenance on this type of machinery is fairly new to me although I am very mechanically inclined (if I may say so myself, lol). I have been here just over a year now and have learned a lot in that time.
On our large Mattison horizontal spindle surface grinder the operator is suddenly getting a chatter pattern in his parts. He had been grinding the exact same parts/material earlier in the day and getting a great finish.
We have already covered a lot of the common issues I found in this forum such as wheel balance, dressing, glazing. All ways appear to be getting plenty of lubrication. He is an experienced operator. He has been running this machine for over 5 years, so I have to trust in his ability to dress properly and know if the wheel is clogged or out of balance.
I pulled the wheel sleeve off and checked the spindle for run-out, we had about .0005" total. I tried pulling up and pushing down on the spindle itself, but saw almost no play.
In the trouble shooting section of the manual it suggests that the cross feed gib could be loose. I located the gib and upon inspection found that I could put a .005" feeler gauge between the front gib and the way. This seems like to much to me, but I can not find an adjustment procedure. The rear gib will not allow even a .003" feeler gauge to enter.
I was going to adjust the front gib just to see if I could close up that gap, but no matter which way I adjust it the gap remains about the same.
I do have a call in to our local machine repair guys and I am waiting to hear back from them. In the mean time I figured I would see if anyone had any suggestions here.