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Forum topic by flatboarder posted 11-15-2010 03:02 PM 892 views 0 times favorited 4 replies Add to Favorites Watch
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flatboarder

100 posts in 2317 days


11-15-2010 03:02 PM

Topic tags/keywords: question

Hello Peoples, This weekend has been just like every weekend,” full of alligators” one problem after the next. You get one problem solved just in time to find out that something else has gone wrong. Boy I sure do love this life. To top it all off I have forgotten how to caculate a compound miter cut. I’m trying to build a box from 1/2 plywood to go around my router on a router table I just got. What it is its the extension table for the PM2000 with the router insert already cut out. This will be the second of two since i already have one to the right of the saw this one will go straight out behind the saw. Anyway I built a rectangle box thats 16 3/4” long by 15 3/16” wide by 15 1/2” deep. From the bottom I want to come down an additional 5” so I want to go from the 16 3/4” and the 15 3/16” down 5” and there I will need a 6” bottom. It has to be wide enough to fit a 4” hose adapter so I can hook up my dust collector. Can anyone help me with this. I thought by just getting my rise and run that I could caculate the angle but it’s not working out right. Help chris

-- Ive cut this board three times and its still too short?


4 replies so far

View TopamaxSurvivor's profile

TopamaxSurvivor

17654 posts in 3137 days


#1 posted 11-15-2010 09:48 PM

If you are building a rectangle, just miter the corners at 45, if I understand you correctly. good luck.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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flatboarder

100 posts in 2317 days


#2 posted 11-15-2010 11:35 PM

well what I’m doing is reducing the box from 16 3/4” x 15 3/16” to six” square with a 40 degree bevel so that the dust or wood chips will taper there way down to the 4” dust collector hose.

-- Ive cut this board three times and its still too short?

View Jim Finn's profile

Jim Finn

2408 posts in 2383 days


#3 posted 11-16-2010 02:38 AM

Woodworkers Guild of Georgia, Miter Calculator <<<<<< Here is the calculator I use.

-- "You may have your PHD but I have my GED and my DD 214"

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TopamaxSurvivor

17654 posts in 3137 days


#4 posted 11-16-2010 05:12 AM

The result should be a 45 for the joint and the rise and tread for the other angle. I could lay it out with a square and cut it on a table saw. I don’t have any idea to calculate the compound miter that would give the same results.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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