When I first reads Chuck’s note with the table I was sure that geometry was the
basis.  But I spent two days trying to figure out what, but the arc tangent
never came out right.  I double checked that I had the correct numerator and
denominator, but it wasn’t even close!!

I finally realized that my calculator was set to do angles in radians - Duh!!

—Scott
Who accepts that occaionally doing something stupid is good for the soul (and
the ego).

On Dec 1, 2022, at 2:55 PM, gtgrouch via groups.io<http://groups.io>
mailto:gtgrouch=rochester.rr.com@g...>> wrote:

If you need this information and have access to a calculator with trig
functions, you can use the arc tangent to get this angle. This varies
according to the calculator, but you enter the number, then press the
1/X function key, then (usually) you press the INV key followed by the
TAN key.

So, on my calculator, the ratio of 1:9 gives me
6.3401917459099093959941376648275 degrees. Not that the fraction
matters.

YMMV. Void where prohibited by natural law or the imprecision inherent
in a pencil line.

Gary Katsanis
Albion New York, USA
with thanks to Chuck Taylor for suggesting this eminently practical
approach

       -----------------------------------------From: "Darrell"
To: "Chuck Taylor"
Cc: "oldtools@g...<mailto:oldtools@g...>"
Sent: Sunday November 27 2022 5:56:15PM
Subject: Re: [oldtools] knockdown shelf project continues to entertain
me

On Sat., Nov. 26, 2022, 8:36 p.m. Chuck Taylor,  wrote:

Darrell asks about wedge angles:


Here are some ratios that cover a reasonable range for wedges and
their
equivalents in degrees:

1:4 is about 14 degrees
1:5 is about 11.3 degrees
1:6 is about 9.5 degrees
1.7 is about 8.1 degrees
1:8 is about 7.1 degrees
1:9 is about 6.3 degrees
1:10 is about 5.7 degrees
1:11 is about 5.2 degrees
1:12 is about 4.4 degrees

I find that ratios are easier to mark out and reproduce
consistently. YMMV.

Cheers,
Chuck Taylor
north of Seattle USA




---------------------------------------------------
Scott Stager
Columbia MO
573-474-5955 home
573-424-4764 cell
stagers@m...<mailto:stagers@m...>