Author Topic: Square  (Read 147 times)

Carpenter84

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Square
« on: October 03, 2018, 05:32:07 AM »
Iíve been on and off looking for some kind of square, be it a cylindrical square, or granite, or whatever. I have no precision square of any kind to actually take advantage of my squareness comparator I made.

I came across this, eBay square

Whatís it For? Any use to me? Says 90*, seems reasonably inexpensive, even if I make a lower offer.
Shawn

First 9x42 column mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
Airco dip/stick 160 welder,
Fully stocked wood shop.

4GSR

Re: Square
« Reply #1 on: October 03, 2018, 07:54:17 AM »
Here's all the squares you'll ever need.

https://www.ebay.ca/itm/NICE-STARRETT-Machinist-Square-Set-No-20-6-3-453E-Die-Makers-Square/263947551164?_trkparms=aid%3D777003%26algo%3DDISCL.MBE%26ao%3D1%26asc%3D20140620091411%26meid%3D824987a35c5f4c138a1546767672ce0a%26pid%3D100009%26rk%3D1%26rkt%3D10%26sd%3D223135748216%26itm%3D263947551164&_trksid=p2047675.c100009.m1982

Seriously, that one you are looking at in my opinion is too small to use.  Unless you are doing something small. Get you a couple of precision squares like the Starrett No. 20 in a 3" and at least a 6" to start with.  A cylindrical square is okay or a granite square, which is what I have.  I do have a B & S Machinists square with a 20" blade on it, and had it calibrated when I got it being within a half thousandth in 20". I find my 3" square being more handier than any of the others.  I also have one with a 1-1/2 beam I use for aligning small taps for tapping holes with.  Your choice to do what you want. You're going to find out that just one square is not going to be enough to work with.
Ken

Carpenter84

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Re: Square
« Reply #2 on: October 03, 2018, 11:11:00 AM »
Holy expensive. Haha.

Are you using those squares to set a squareness comparator? Or just for scribing?
I have a full set of these but I'm sure they're far from precision. I just use them for quick scribing. I'm not sure is trust them set a squareness comparator.
Shawn

First 9x42 column mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
Airco dip/stick 160 welder,
Fully stocked wood shop.

woodchucker

Re: Square
« Reply #3 on: October 03, 2018, 11:20:28 AM »
Look at garage sales.
The square you are looking at is too small.

The purpose of the bevel is to be able to see against a knife edge (the bevel) whether any light will shine past.
I have a large Starret about 10" possibly smaller, possibly larger.. I'm at work and can't measure it.
it serves me well. As well as my starret combo square (for rough squaring) although it is dead on.

Even a cheap set may be in your accuracy range.
http://www.shars.com/products/measuring/squares
Jeff
Clausing 8520   SB Model 9a - power hacksaw, Milwaukee band saw in a table.  Delta Rockwell Surface Grinder (not online yet .. being rebuilt where am I going to stick this)
For pics: https://woodchucker.imgur.com

Carpenter84

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Re: Square
« Reply #4 on: October 03, 2018, 12:42:10 PM »
But just to clarify, you're suggesting I use these squares as a standard for my squareness comparator?
(Yes, I will pass on the small bevel square)
Shawn

First 9x42 column mill,
Enterprise 10x28 lathe,
Ko Lee 6x12 surface grinder,
Airco dip/stick 160 welder,
Fully stocked wood shop.

chips and more

Re: Square
« Reply #5 on: October 03, 2018, 12:53:02 PM »
A cylindrical square is nice to have :), but pricey.

f350ca

Re: Square
« Reply #6 on: October 03, 2018, 01:48:02 PM »
Made one a while back from a piece of HT 4140. Its out by a couple of 10ths, but you find the plumb sides and use them. The pin was used to drive it on the face plate, replaced it with a flush set screw.