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

-MIKE-

On 1/3/13 6:21 PM, wrote:
On Thursday, January 3, 2013 6:57:37 PM UTC-5, -MIKE- wrote:
On 1/3/13 5:30 PM, wrote:

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).

Use a knife.

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.

Great, if we need to send a rocket into space, but not necessary
for

woodworking. :-)

I like to have at least one master square that I know is balls to
wall accurate. I had no way of checking before and I do now. The
Draw-A-Line and flip method will never tell you how far out of wack
your square is - only that it might be out of wack. There is no way
to quantitate the angle error unless you can measure the distance
betwene the lines/knife marks with a caliper (good luck). How much
of a gap in between the marks is considered unacceptable? You can't
easily answer that question so why bother checking in the first
place?

Yeah, ok man... good luck with those rocket ships. :-)

--

-MIKE-

"Playing is not something I do at night, it's my function in life"
--Elvin Jones (1927-2004)
--
http://mikedrums.com

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