ballen
Diamond
- Joined
- Sep 25, 2011
- Location
- Garbsen, Germany
I have a question for Richard or anyone else here who has some hands on experience with fixing up cylindrical grinders.
The swivel table on top is used for grinding tapers. On my grinder you tweak it to get your part cylindrical/parallel and then you set over the swivel table using gage blocks, to get a specific taper. There is a nice screw feed handle for doing this.
In practice, when the time comes to swivel it, the table is a bit stuck/glued in position. After it breaks free it moves OK, but the reason for this is that both the underside of the swivel table and the top of the moving slide table have ground pads where they meet. So they tend to wring together.
The geometry is perfect, nothing to fix there, but I was wondering if it made sense to scrape some half-moons on one of the faces, or just break it up with the crosses using the Biax, making sure to leave enough original surface to preserve the geometry.
But this might also be a bad idea, because this is an area quite exposed to grit and coolant, and by design, when you slide the swivel table, it will expose part of the top and bottom pads. Also, those pads are different sizes, the top ones are larger than on the bottom, so if I follow the rule of thumb to put oil pockets in the top part, those will be exposed to air/grit.
Another approach would be to make some oil grooves which can not be exposed and add oil ports and nipples.
Which brings me to my question for Richard: do you put oil grooves or oil pockets on swivel tables? Where??
Thanks!
Bruce
The swivel table on top is used for grinding tapers. On my grinder you tweak it to get your part cylindrical/parallel and then you set over the swivel table using gage blocks, to get a specific taper. There is a nice screw feed handle for doing this.
In practice, when the time comes to swivel it, the table is a bit stuck/glued in position. After it breaks free it moves OK, but the reason for this is that both the underside of the swivel table and the top of the moving slide table have ground pads where they meet. So they tend to wring together.
The geometry is perfect, nothing to fix there, but I was wondering if it made sense to scrape some half-moons on one of the faces, or just break it up with the crosses using the Biax, making sure to leave enough original surface to preserve the geometry.
But this might also be a bad idea, because this is an area quite exposed to grit and coolant, and by design, when you slide the swivel table, it will expose part of the top and bottom pads. Also, those pads are different sizes, the top ones are larger than on the bottom, so if I follow the rule of thumb to put oil pockets in the top part, those will be exposed to air/grit.
Another approach would be to make some oil grooves which can not be exposed and add oil ports and nipples.
Which brings me to my question for Richard: do you put oil grooves or oil pockets on swivel tables? Where??
Thanks!
Bruce