DIYbanter - View Single Post - How Square is Your Squa A dial indicator method

tiredofspam

On 1/3/2013 6:30 PM, wrote:
On Thursday, January 3, 2013 6:24:52 PM UTC-5, Dave Balderstone wrote:
In article ,

wrote:

Let me know what you guys think.

I've been working on a new method (new?) for checking the squareness of a

square using a dial indicator. The method works in theory. I've tried it

and it seems to work in practice. A caveat is that the square needs a thick

edge to support a stylus.

I am going to work on a video demonstrating the process.

http://www.garagewoodworks.com/square_a_square.php

Thoughts?

Seems totally unnecessary. A pencil and a straight edge (a la sheet

good cutoff) is all you need to check if it's actually square. And it's

fast to set up.

read the article.

A minor caveat to this method is that it can be difficult to discern small gaps between the two pencil lines (especially with a thick pencil lead). The most you might be able to detect is a 0.010" difference which equates to a minimum detection of 0.036 degrees with an 8" square.
Another caveat is that the edge you place your square against must be perfectly flat, otherwise you will not get an accurate calculation of your square's angle error.

The dial indicator method is 10X more accurate.

--

Outside of a dog, a book is man's best friend. Inside a dog, it's too dark to

read. - Groucho Marx

Then use a marking knife.