I've had occasion to need a smaller but accurate block to pinch a part in a vice while sitting on angled blocks or in an odd setup. This lead me to buy a set of smaller blocks just for odd jobs. $30 shipped isn't bad.
I got them in and measured the flat sides on my surface plate with a tenths indicator. The largest face was out 0.0003". I'm thinking not bad!
Then I checked the perpendicularity and my happy turned to sad.... The sides were 0.002" out of perpendicular on each side. How annoying! Lol! Apparently the guy who made them wasn't much into grinding accuracy.
I reground two larger blocks this evening. The over all size is irrelevant for the purpose. I put one at a time in my Hermann Schmidt vise in a way that gave me access to two sides at the same time.
Once the two sides were ground I could finish the opposite sides directly on the magnet two at a time. Then I knocked off the ends sticking out the side of the vice and then put both directly on the magnet to bring them to the same thickness.
The result is the large surfaces are both 0.0001" out. Probably wear in my poor old surface grinder. The blocks are so square my modified surface gauge and tenths indicator could not pick up a difference in perpendicularity. They are more square than my ability to measure on all sides
That Hermann Schmidt vise is a hell of a tool. First time I've used it to attempt such accuracy. I'm so completely happy with how these came out and how well my old surface grinder does on small projects. The finish isn't excellent but it never was.
I got them in and measured the flat sides on my surface plate with a tenths indicator. The largest face was out 0.0003". I'm thinking not bad!
Then I checked the perpendicularity and my happy turned to sad.... The sides were 0.002" out of perpendicular on each side. How annoying! Lol! Apparently the guy who made them wasn't much into grinding accuracy.
I reground two larger blocks this evening. The over all size is irrelevant for the purpose. I put one at a time in my Hermann Schmidt vise in a way that gave me access to two sides at the same time.
Once the two sides were ground I could finish the opposite sides directly on the magnet two at a time. Then I knocked off the ends sticking out the side of the vice and then put both directly on the magnet to bring them to the same thickness.
The result is the large surfaces are both 0.0001" out. Probably wear in my poor old surface grinder. The blocks are so square my modified surface gauge and tenths indicator could not pick up a difference in perpendicularity. They are more square than my ability to measure on all sides
That Hermann Schmidt vise is a hell of a tool. First time I've used it to attempt such accuracy. I'm so completely happy with how these came out and how well my old surface grinder does on small projects. The finish isn't excellent but it never was.
