Philipraposo1982
Plastic
- Joined
- Nov 3, 2017
Hi everyone,
I recently got a new job and I have been working on a Cincinnati centerless grinder. It's the 330-10z-xg.
I have been training with an individual who is not familiar with this machine but he has worked with an older manual centerlessachine for years.
We are having a few issues and would love some advice if anyone has some for us.
A little background:. We manufacture punch and die mainly using the centerless to remove about 0.010" after the material returns from heat-treatment. We primarily use M4 material and the diameters range from .25-1.25". With exceptions of larger parts of rare occasions.
We are using a Norton wheel it's the
55a80-lvs3 it's 10" wide and 24" diameter. Our machine runs at 1049 rpm. Our parts generally have tolerances of +.0002-+.0005 but often times it's is tighter than this.
First issue. The machine grinding wheel slows down when grinding larger diameters. The longer the part the worse it is. Just doesn't seem to be able to handle the load. Maybe we are feeding to fast or our wheel is too hard I. Not sure. Any thoughts on this? I can provide all feedrates if needed.
Second issue I am having is with the parts. Finish is good but I get a higher mid compare to the ends. No idea how to fix this. Example. We are grinding a punch length is 5" with a diameter of .500". Tolerance on size is +.0002 +.0005. I can get the ends of the part within half a tenth apart but the middle will be larger sometime as much as .0002"
What would cause this? The larger parts show this more. Shorter parts are easier to maintain size but still issue is there.
Thanks!!
I recently got a new job and I have been working on a Cincinnati centerless grinder. It's the 330-10z-xg.
I have been training with an individual who is not familiar with this machine but he has worked with an older manual centerlessachine for years.
We are having a few issues and would love some advice if anyone has some for us.
A little background:. We manufacture punch and die mainly using the centerless to remove about 0.010" after the material returns from heat-treatment. We primarily use M4 material and the diameters range from .25-1.25". With exceptions of larger parts of rare occasions.
We are using a Norton wheel it's the
55a80-lvs3 it's 10" wide and 24" diameter. Our machine runs at 1049 rpm. Our parts generally have tolerances of +.0002-+.0005 but often times it's is tighter than this.
First issue. The machine grinding wheel slows down when grinding larger diameters. The longer the part the worse it is. Just doesn't seem to be able to handle the load. Maybe we are feeding to fast or our wheel is too hard I. Not sure. Any thoughts on this? I can provide all feedrates if needed.
Second issue I am having is with the parts. Finish is good but I get a higher mid compare to the ends. No idea how to fix this. Example. We are grinding a punch length is 5" with a diameter of .500". Tolerance on size is +.0002 +.0005. I can get the ends of the part within half a tenth apart but the middle will be larger sometime as much as .0002"
What would cause this? The larger parts show this more. Shorter parts are easier to maintain size but still issue is there.
Thanks!!