The Shop > Tools

Angle Plates - How are they made?

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nrml:
I remember reading somewhere of lorry gudgeon pins being used as cylindrical squares. It makes perfect sense as they are hardened and ground to close tolerances. They will probably be more accurate than the average shop made square.

vtsteam:
Sparky, yes, concave or flat face turning will make a true cylinder square which can become your reference square. A convex face is pretty obvious because it wobbles on a flat surface. You can blue and rub on a surface plate to check the other two. You can use a toolpost grinder instead of a lathe tool if you want.

Once you've got your reference cylinder sqaure you can use it to check your setup for the grinder to do the angle plate.

The method I gave above can be used on a grinder, and the first angle plate can be any kind of angle -- even angle iron. You just shim it unti its vertical leg is square to the table (checking with your cylinder squre) and then bolt it down. Then bolt your angle plate to be machined to that, and start grinding.

Or you can do the whole thing in the lathe as I mentioned earlier. If you want to check your lathe for how well it faces, it's easy enough to do with a straightedge and some marking blue. I skim my cast aluminum faceplate to check it. Scrape your carriage if need be to correct. (well you can set the topslide over and use that temporarily if it has enough travel -- but you'll probably want the cross slide true anyway).

All this is done without any true measuring tools, and I think it's analagous to the 3 plate method for  getting a true flat.

SwarfnStuff:
Yep Nrml, I paid a visit to a truck / lorry repair place recently and got a few gudgeon pins that unfortunately were too big for my X2 mill. Not to worry, they will make great rollers for a bending roll eventually. There was one in the grab lot I got from a small Japanese Diesel that was perfect size but alas, I only grabbed one. Bummer have to wait till next visit and hope they have worked on a similar small truck.
John B

krv3000:
hi just my bit as I do a lot of grinding at work all ways start with a flat face that means a lot of filing or grinding to get one face 90% flat then the next face is made level with that and so on 

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