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..."
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
 >

 Thanks Chuck
 I'm going to print this out and stick it on the shop wall

 -- wood hoarder, blade sharpener, and occasional tool user

 >

 



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