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How do I make an octagon out of crown molding

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Blog entry by MTay posted 07-01-2011 05:10 PM 2430 reads 0 times favorited 9 comments Add to Favorites Watch

Hi,

I think this question was asked on another post but the post was pretty old, so though i would open a new entry.

I am trying to make an octagon out of crown molding in order to make a clock similiar to the picture.

I am new to woodworking, and this is my first attempt with making something like this.

I tried making a sample out of scrap using a 22.5 miter and and 22.5 bevel, with the stock laying flat on the compound miter saw, but I ended up with a six sides, not eight once i had it assembled.

Can anyone step me through this.

What am I doing wrong? The crown molding I am using is 6” wide.

Thanks



9 comments so far

View j_olsen's profile

j_olsen

155 posts in 1924 days


#1 posted 07-01-2011 06:59 PM

are you wanting this to be flat or project out
if you are looking for it to be flat you don’t need both angles – flat leave the blade 90 degrees to the horizontal and cut the mitre at 22.5

-- Jeff - Bell Buckle, TN

View MTay's profile

MTay

5 posts in 1274 days


#2 posted 07-01-2011 07:03 PM

projected out like in the picture of the clock. So if the clock face was sitting on a table, the inside opening would be raised. Does the molding upper edge need to sit up against the wall, or sit flat on the saw?

View GregD's profile

GregD

637 posts in 1889 days


#3 posted 07-01-2011 07:05 PM

If you want it to be beveled, here is the formula you need.

Someone also posted a link to a program to do the calculation for you, but I don’t have that handy at the moment.

-- Greg D.

View GregD's profile

GregD

637 posts in 1889 days


#4 posted 07-01-2011 07:15 PM

Have a look at this project. The sides of those trays are beveled and require compound cuts. Comment #8 has a link to a program that does the calculation.

If the final assembly is flat – the backs of all the sides are in the same plane – then do what j_olsen said.

-- Greg D.

View MTay's profile

MTay

5 posts in 1274 days


#5 posted 07-01-2011 07:35 PM

OK may be a dumb question, but do I position the crown molding so the upper edge is up against the wall of the saw, then cut?

View j_olsen's profile

j_olsen

155 posts in 1924 days


#6 posted 07-01-2011 07:40 PM

that will depend on how much projection you want
if you want the full projection of the crown follow what brantly said

-- Jeff - Bell Buckle, TN

View saddletramp's profile

saddletramp

994 posts in 1391 days


#7 posted 07-01-2011 07:43 PM

oops

-- ♫♪♪♫♫ Saddletramp, saddletramp, I'm as free as the breeze and I ride where I please, saddletramp ♪♪♪♫♪ ...... Bob W....NW Michigan (Traverse City area)

View MTay's profile

MTay

5 posts in 1274 days


#8 posted 07-01-2011 07:46 PM

I will give these suggestions a try.

Thanks for all your help.

I will post on whatever the outcome is:)

Thanks again.

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1868 days


#9 posted 07-01-2011 11:24 PM

if its just a flat octagon frame
the cutting angle is 45 degree

Dennis

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