Direct Reading Precision Square

[Rob @ Target Machine]

Our inspector recently retired and we came across one of these:

 

 

 

Does anyone know how to use it?

 

Check if it is still in calibration?

 

Is it obsolete?

 

This is all I can find on the web: Linky

[Odell]

Obsolete?....YEP! That's an old fashion way to check angles and squareness....Pretty cool to look @ though.

[Rob @ Target Machine]

Thanks for the reply. I was pretty sure it was a paperweight.

[Odell]

Yes it is ....BUT a nice one!

[[email protected]]

quote:

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I was pretty sure it was a paperweight

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ya wanna sell it?

[Rob @ Target Machine]

Sorry, the owner wants to keep it.

[jeff]

quote:

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Sorry, the owner wants to keep it

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Everything has a price

[Rob @ Target Machine]

I think it's more out of respect for the inspector. When he retired, he left his things behind, the cylinder square was his. If we start selling his stuff....

[Gramby]

Oh man we use a cylinder square daily in our shop. We are a Die shop so we do a lot of grinding of die blocks of course.

the cyclinder square is used to set up a indicator style squareness gage. The indicator base has a carbide tip on the front which is butted up against the square. The indicator is adjustable up and down. Zero out the indicator at the highest possibly point against the cyclinder square. then with your die block standing up on edge on your surface flat check your squareness.

What this means is you only have half on the necessary equipment to do this. Your need the indicator base also.

KEEP IT

[[email protected]]

quote:

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we use a cylinder square daily

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Here too.....thats why I wanted to buy it. The shop has one, but I would like one of my own

[Odell]

I'm also in a tool and die shop but I found it's easier to use a digital .0001 indicator and square off the spindles. Everyone has their own way.

[Rob @ Target Machine]

Gramby - I know how to use it as a square, but it also has graduations from 0 to 12 that coincide with ellipses on the side.

 

The link above states that these are to measure from 0 to 12 degrees out of square, but I can't imagine how.

[Rob @ Target Machine]

Ok, I found some more info. Now I know what the graduations are.

 

Thanks for the replies.

 

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The cylindrical square (Figure 15) is a simple tool for checking squareness of two planes or a plane and an edge.

 

The direct reading cylindrical square indicates "out-of-squareness" of work in units of .0002" without transfer tools.

 

 

A true cylinder is one with one end lapped perfectly square and the other end lapped to a fixed angular relation with the sides. With the angular end down and the base of the cylinder in contact with the part to be checked, the square is rotated until light is shut out. Reading up the topmost dotted curve in contact with the part to the number at the top of the square shows the out-of-squareness of the part in 2, 4, 6, to 12 ten-thousandths of an inch. The same reading may be obtained from two places on the circumference of the square, thus the instrument is self-checking. With the squared end down, it may be used as a master square with one of its perpendicular lines used for reference.

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Figure 15. Direct Reading Cylindrical square.

 

[ 03-31-2010, 08:03 PM: Message edited by: Mastercam Guru ]