Thread: Precision Engineers Square

Hi Dean, do you have a dial indicator? I made an L bracket that fitted on the back of the DI and used that in the collet to bring it all square. I found it more accurate to do than using a square. What type of mill do you have?
Regards
Kryn

Hi Dean,

Leave Precision out of your search.
I assume this is the sort of thing you are after
http://www.ebay.com.au/itm/Moore-Wri...item2a519297fa

Stuart

Originally Posted by Stustoys

Hi Dean,

Leave Precision out of your search.
I assume this is the sort of thing you are after
http://www.ebay.com.au/itm/Moore-Wri...item2a519297fa

Stuart

I was looking for something with a bit more beam/blade thickness. A single piece square.

Precision Engineers Square.jpg

It may be that I have to use what you linked to. The problem is it is hard to tell how thick the blade is as I have to run the DTI along both external edges for best accuracy. I don't trust the slots to be accurate enough and I don't have any accurate way to locate to them. The single piece square above is flat which means I can sit it on the mill table or on equal height buttons for clamping at 3 points. I am only working on what my imagination has come up with so don't make any assumption I know what I am talking about. I am open to any suggestions, but if I recall correctly, there was a thread about doing this some time back and the best that came out of it was to use a square somewhat like I am doing it.

I found M & W squares like that at the same store using "Precision" in my search .


Kryn.

I am talking about a rotating table that needs to be re-set square to the Y axis after being moved re my thread https://www.woodworkforums.com/f65/poor-mans-dro-195371

Mill Table Rotated.jpg

The scale behind the tied up cable is the angle the table is rotated from normal. In this case you are looking at the rear of the table.

Dean

I recently bought a small and medium size square from McJings.

I didn't test for accuracy but they appear to be decent quality, and reasonably priced in a nice plastic case.

I'd say a tad better than your plastic set square.

Ken

Hi Dean,
Sorry, now I understand what you are trying to do. If you had a piece of bar 10-12 mm thick with 2 machined edges (parallel) that could be bolted to the table, square the bar using any square, check it both sides from the same face, to ensure that it is square to the front edge.
Just because a square is supposed to be, doesn't mean it is, so checking both sides corrects any discrepancies.
Once you have the table set correctly, is it possible to fit a dowel pin to correctly and easily locate each time?
Kryn, again

Hi Ken, I'd check the square to ensure that it's correct. Not trying to be smart, but do you know how to check it?

Can you use an inside mic off the machined surface on the coloum and the rear of the table.

KB, you're not being smart, I sometimes use the square as a hammer, just kiddin.

How do you test a square?

Ken

Originally Posted by neksmerj

How do you test a square?

With a better one -A ground cylindrical square is probably the best master for this. It is checked by measuring diameter top and bottom (that is, is it parallel?), and then on a surface plate measuring the offset of the top with respect to the bottom. If these offset measurements are equal then it is square to the surface. I vaguely recall there is a thread about it somewhere.

Michael

Originally Posted by neksmerj

How do you test a square?

Ken

https://www.youtube.com/watch?v=baqCWk4OmwU

Originally Posted by KBs PensNmore

Hi Dean,
Sorry, now I understand what you are trying to do. If you had a piece of bar 10-12 mm thick with 2 machined edges (parallel) that could be bolted to the table, square the bar using any square, check it both sides from the same face, to ensure that it is square to the front edge.
Just because a square is supposed to be, doesn't mean it is, so checking both sides corrects any discrepancies.
Once you have the table set correctly, is it possible to fit a dowel pin to correctly and easily locate each time?
Kryn, again

Hi Ken, I'd check the square to ensure that it's correct. Not trying to be smart, but do you know how to check it?

The method I am thinking of is to use the square clamped to the mill table. Dial-in the side running parallel to the X axis adjusting until as close as possible, just like setting the vise parallel.

Using the DTI on the other side of the square, adjust the rotary position of the table until this is true to the Y axis.

If you are after perfection, flip the square over using the Y axis side as the pivot axis and repeat the process, but averaging any variations. If the square is precise there should not be any. OH, we have just checked the square for precision.

This is the same way you check a normal (Woodworking) square, using the square to draw a 90deg line on a sheet of some type with a straight edge, flip and repeat to see if the lines are parallel.

Can you use an inside mic off the machined surface on the coloum and the rear of the table.

Pipeclay

The machined surfaces do not extend low enough.

Mill Table Rotated.jpg

I have found a range of squares of the type I am looking for.

http://www.ebay.com.au/itm/KINEX-403...item487f38932e

Unfortunately there is zero information besides "Product Name: KINEX 4034-15 300 x 200mm Precision Flat Square".

Kinex Square.JPG

How precise is anyones guess. Anyone know how thick the blade is on a Moore and Wright square?

Dean

Originally Posted by Oldneweng

The method I am thinking of is to use the square clamped to the mill table. Dial-in the side running parallel to the X axis adjusting until as close as possible, just like setting the vise parallel.

Using the DTI on the other side of the square, adjust the rotary position of the table until this is true to the Y axis.

If you are after perfection, flip the square over using the Y axis side as the pivot axis and repeat the process, but averaging any variations. If the square is precise there should not be any. OH, we have just checked the square for precision.

This is the same way you check a normal (Woodworking) square, using the square to draw a 90deg line on a sheet of some type with a straight edge, flip and repeat to see if the lines are parallel.



Pipeclay

The machined surfaces do not extend low enough.

Mill Table Rotated.jpg

I have found a range of squares of the type I am looking for.

http://www.ebay.com.au/itm/KINEX-403...item487f38932e

Unfortunately there is zero information besides "Product Name: KINEX 4034-15 300 x 200mm Precision Flat Square".

Kinex Square.JPG

How precise is anyones guess. Anyone know how thick the blade is on a Moore and Wright square?

Dean

Hi Dean.
I have one M&W square still in box . i will check for you soon . it also available for sale too .
cheers'
Peter

Hi Dean,

The bigger they are the thicker they are, not a lot of help there I know I can measure a few tomorrow if you like. Though even the smallest I have you can run a DTI along.(I'll measure them tomorrow if you like)

I don't have one of the beveled flat ones. but if I recall correctly they are pretty thin.

I rest the square against the front of the table. You could clamp it to the table if you wish.(though as I dont have a swinging table I'm squaring work the the table).

Stuart

p.s. typed last night but still there this morning, I'll get out and get measuring shortly

Think I've misunderstood the question again.. but as I've already measured them anyway.
50mm square has a 1.5mm blade.
9" is 3mm
24" is 4.8mm

You can check a square without a master square if you have a flat plate.
Measure the blade for parallel. Put the short side on the plate against a straight edge, clamp a stop against the inside of the vertical blade near the bottom, zero a DTI on the inside of the vertical blade near the top, check zero by sliding the square away and back, check square by turning 180. Would be more accurate than using the X axis of my mill as its "less than wonderful", hopefully your mill would do better.

Stuart

Originally Posted by thorens

Hi Dean.
I have one M&W square still in box . i will check for you soon . it also available for sale too .
cheers'
Peter

Thanks Peter. I may be interested. Depends on the size.

Dean