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Trying to figure compound miters

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Forum topic by pops64 posted 07-02-2014 07:40 PM 754 views 1 time favorited 4 replies Add to Favorites Watch
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pops64

3 posts in 890 days


07-02-2014 07:40 PM

I’am trying to make a 4 sided lamp shade with a 20 degree slope and been trying to get the blade angle and miter gauge angle . I’ve been doing trial and error and cant get it just right do not want but joints . downloaded 3 different charts for this and each one is different . I made one of these 30 yrs. ago in wood shop and cant remember the numbers. and dont know which chart to trust. If someone knows please help this is a gift and I’am running out of time. thanks pops


4 replies so far

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LeTurbo

217 posts in 1051 days


#1 posted 07-02-2014 08:09 PM

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NoThanks

798 posts in 995 days


#2 posted 07-02-2014 08:18 PM

I get 43.22 deg miter
14 deg bevel
on 2 different calculators
http://www.blocklayer.com/CompoundMiterEng.aspx
http://www.altereagle.com/4_How_to_insta.html

-- Because I'm gone, that's why!

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pops64

3 posts in 890 days


#3 posted 07-03-2014 12:13 AM

thanks guys I’ll try these numbers there different from the charts Ifound.

View ChefHDAN's profile

ChefHDAN

808 posts in 2315 days


#4 posted 07-03-2014 12:23 PM

I had a similar challenge, LJ Dallas sent me to this link, worked like a charm, but, of course, it also showed me how out of whack the scale on my MS was, It took 4 prototypes to get to the settings to dial in for my final piece, but then I’m nowhere near a machinist for accuracy, 1/2 degree angles are tough.

Compound Miter calculator
http://jansson.us/jcompound.html

-- I've decided 1 mistake is really 2 opportunities to learn.. learn how to fix it... and learn how to not repeat it

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