On 5/29/2011 10:22 PM, RG Sparber wrote:
> Ron,
>
> I was not aware that this square is adjustable. Beyond hitting the joint
> with a prick punch, how do you adjust it?
I took a college level machine shop course several years ago. The
instructor showed us how to hold the thick leg of a machinist square and
gently tap the other leg on a piece of pine 2x4 laid on a sturdy
surface, such as a work bench. Each tap will move the leg a little. Less
is more, as you don't want the joint to loosen over time and you don't
want to ding the square.
Then you test the square against another on a flat surface. He used a
granite surface plate and cleaned it first.
Ideally, you should have 3 squares to check against each other.
A quick and dirty square when you have no other is a piece of paper.
Fold a sharp crease and then fold another while aligning the first
folded edge to itself. Perfect 90 degrees.
Of course there is no such thing as perfect. The longer the first
crease, the more accurate the angle.
--
Ron Thompson
On the Beautiful Florida Space Coast, right beside the Kennedy Space Center, USA
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