ballen
Diamond
- Joined
- Sep 25, 2011
- Location
- Garbsen, Germany
Not sure if the question is better here or in the "Abrasive Machining" forum. But I consider this to be part of "machine reconditioning" so will try here first.
My J&S 540 surface grinder is now my only non-DRO machine and it's getting on my nerves. I was grinding a part for a friend this evening and got a step wrong by about 5 microns, which I should have gotten closer. I don't think I messed up the marks, maybe the lead screw is off by that amount. Anyway, it reminds me that I need to fit a good glass scale on the vertical and cross axes.
The cross is easy, but the vertical is harder. I was looking at the machine, and can see one good location. If you pull the upper back panel off the machine, the metal casting that carries the spindle is visible (the spindle pulley is right in the middle of this casting). I could attach a 300mm (12") glass scale to the back of that casting, and mount the read head on the (fixed) body of the machine. The read head would be close to the line defined by the spindle rotation axis, but offset along that axis (say 200-250mm, 8-10") from the metal rails that carry the casting up and down.
It's a good location in terms of dust/coolant/flying bits. Is it a good or bad location in terms of accuracy? Is there a better place?
Cheers,
Bruce
My J&S 540 surface grinder is now my only non-DRO machine and it's getting on my nerves. I was grinding a part for a friend this evening and got a step wrong by about 5 microns, which I should have gotten closer. I don't think I messed up the marks, maybe the lead screw is off by that amount. Anyway, it reminds me that I need to fit a good glass scale on the vertical and cross axes.
The cross is easy, but the vertical is harder. I was looking at the machine, and can see one good location. If you pull the upper back panel off the machine, the metal casting that carries the spindle is visible (the spindle pulley is right in the middle of this casting). I could attach a 300mm (12") glass scale to the back of that casting, and mount the read head on the (fixed) body of the machine. The read head would be close to the line defined by the spindle rotation axis, but offset along that axis (say 200-250mm, 8-10") from the metal rails that carry the casting up and down.
It's a good location in terms of dust/coolant/flying bits. Is it a good or bad location in terms of accuracy? Is there a better place?
Cheers,
Bruce