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ABOUT PRACTICAL MACHINIST. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers.
Place the 1-2-3 blocks on the surface plate (1 x 3 edges up) and parallel so the stock of the square can be straddled by them. The 1-2-3 blocks straddles the stock raising the surface gage and keeping it parallel to the reference surface. Plant the surface gage on the 1-2-3 blocks. Allow the square to reach thermal equalibrium.
Nicest square I have is a Mauser 7.5" beveled edge square that was made in Germany for Scherr Tumico. $70 off of eBay. Looks to be brand new. As far as I can measure it appears to be dead accurate for it's full length.
A beveled edge square is nice if you are trying to see light passing between a part, and the blade of the square. A square edge can be so much wider that it will eclipse the light if you happen to have your eye positioned below the plane of that face of the blade, misleading you into thinking that something is 'dead on' when it is not.
ABOUT PRACTICAL MACHINIST. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers.
Apr 22, 2013. #4. AdamC said: No, you can't fix it. You might be able to straighten it some, but it probably is out of square now and will be more or less so after you screw with it. It may or may not be good enough for what you are using it for so I'd hesitate to suggest it is trash, or must be reground.
No combination square will HOLD squareness like an (undropped) machinist's square. The sliding of the blade wears them out of square,IF we are talking about real high precision. A hardened head combo would be best IF you must have one,but they will still not out perform solid squares. Fowlers? They might be made anywhere by now,I think.
I buy old tools for resell and picked up this Starrett square. I normally deal in old woodworking tools but occasionally sell machinist tools. I have sold quite a few 6" Starrett squares in the past but none with the early dates on them. I normally get around $30-$35 for a square like this one...
Look in the Nov Dec issue of Home Shop Machinist last paragraph of page 47 and the photos and text on page 48 and 49 for words and pictures on how to check a square with simple shop made equipment or a surface gage and a dial test indicator on a granite surface plate.
To check the square the long side is placed against a saw table edge and magnets on the table edge hold the square and align the blade to the edge. This is done near the miter slot. It will be very apparent if the square is off at all. I believe the table saw slots are extremely close to square off the table edge.