motion guru
Diamond
- Joined
- Dec 8, 2003
- Location
- Yacolt, WA
We have a rotary surface grinder that we would like to improve accuracy of finish thickness to +/- 0.0002 inches.
The parts are Rc60 - Rc65 and we are finding that the wheel loading changes significantly between wheel dressings and downward force on the wheel / chuck interface varies from 800 lbs on a freshly dressed wheel to over 3000 lbs when the cutting performance of the wheel requires dressing again.
This variation in downfeed force creates enough deflection in the chuck, grinding wheel mounting flange, and present measurement system to make hitting our desired tolerances a bit of a crap shoot resulting in under ground parts by as much as 0.0008 inches . . .
Has anyone used the Marposs inline measurement system?
MARPOSS universal measuring gauge for grinders
As I see it we could mount a measurement head on the chuck and another would differentially measure the parts being ground. Marposs says an interrupted surface is no problem as the parts go by on the rotary chuck. We can have as many as 16 parts on a chuck spinning at 25 rpm (one part hitting the sensor every 150 msec). Marposs indicates 0.1 um accuracy in this kind of application which is roughly 50x better than our desired tolerance so resolution and accuracy should be more than adequate.
I would be interested in any experience forum members might have with this or a similar product.
The parts are Rc60 - Rc65 and we are finding that the wheel loading changes significantly between wheel dressings and downward force on the wheel / chuck interface varies from 800 lbs on a freshly dressed wheel to over 3000 lbs when the cutting performance of the wheel requires dressing again.
This variation in downfeed force creates enough deflection in the chuck, grinding wheel mounting flange, and present measurement system to make hitting our desired tolerances a bit of a crap shoot resulting in under ground parts by as much as 0.0008 inches . . .
Has anyone used the Marposs inline measurement system?
MARPOSS universal measuring gauge for grinders
As I see it we could mount a measurement head on the chuck and another would differentially measure the parts being ground. Marposs says an interrupted surface is no problem as the parts go by on the rotary chuck. We can have as many as 16 parts on a chuck spinning at 25 rpm (one part hitting the sensor every 150 msec). Marposs indicates 0.1 um accuracy in this kind of application which is roughly 50x better than our desired tolerance so resolution and accuracy should be more than adequate.
I would be interested in any experience forum members might have with this or a similar product.