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How do I measure a outside corner mitre cut?

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Forum topic by edwood1975 posted 01-06-2015 10:37 PM 1318 views 0 times favorited 15 replies Add to Favorites Watch
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edwood1975

495 posts in 808 days


01-06-2015 10:37 PM

Hello

I have a compound mitre saw and I want to cut a 45 angle ( I know how to cut a 45 bevel ) but I’m not sure what the measurement should be!!! Let me lay it out for you..

I want to put an outside trim on my workbench and width is 78” wgat should my measurement be to make sure the pieces meet up on the corner ??

Please help!!!!!

-- Ed


15 replies so far

View Earlextech's profile

Earlextech

1159 posts in 2156 days


#1 posted 01-06-2015 10:41 PM

The short end of the cut should measure 78”. That’s all there is to it. The long end of the cut varies by the thickness of the trim.

-- Sam Hamory - The project is never finished until its "Finished"!

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RussellAP

3059 posts in 1752 days


#2 posted 01-06-2015 10:43 PM

What earl said, unless it’s crown molding. Believe me, you can’t get written advise on how to do crown molding.

-- A positive attitude will take you much further than positive thinking ever will.

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MrUnix

4230 posts in 1664 days


#3 posted 01-06-2015 10:55 PM

Add twice the width (or thickness depending on how it’s being applied) of your trim.. if it’s 1/2”, then you would cut 79” (inside would measure 78”). 1” trim, add 2”, and so on. Although I usually cut a bit long and then sneak up on it a little bit at a time until it’s just right :)

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View kdc68's profile

kdc68

2526 posts in 1742 days


#4 posted 01-06-2015 11:01 PM

If you have a miter on each end like this
45….........45
The long side is double the width of the trim….
Example: the trim is 2” wide, the short side is 78” and the long side measurement is 82”
v
v
Edit : MrUnix beat me to a good example

-- Measure "at least" twice and cut once

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greg48

588 posts in 2223 days


#5 posted 01-06-2015 11:47 PM

To your credit Ed, once you start on a project there is no “dawdle” in your vocabulary. I suspect that by the time you receive any advice, your long past the need for it. MrUnix has good advice, start on the long runs in the front and close on the short runs in the back (sneak up on the closing lengths).

-- Greg, No. Cal. - "Gaudete in Domino Semper"

View Rick's profile

Rick

8287 posts in 2498 days


#6 posted 01-07-2015 05:30 AM


The short end of the cut should measure 78”. That s all there is to it. The long end of the cut varies by the thickness of the trim.

- Earlextech

He’s correct. How else could you do it? “Short End” (of the 45 Degree Mitre Cut) is the Outside Length of your Workbench, (78”) and the “Short End” Cut is the Outside Width of your Workbench.

I’ll assume you meant the “Length” of your Bench is 78”, not the width. If I’m wrong …. That’s one big Mother of a Workbench ...LOL…

The Workbench below is the one you’re speaking of. Yes?
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

-- Hope Everyone Is Doing Well! .... Best Regards: Rick

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NoThanks

798 posts in 994 days


#7 posted 01-07-2015 05:52 AM

I basically work my way around the table.
I cut the 45 on one edge first,
Then I clamp it in place with the 45’d corner lined up with the corner of the table,
I then make a pencil mark for the cut at the opposite end. Cut to the line and attach that pc.
then do the same for the 2nd and 3rd pc except I don’t attach the 3rd pc yet.
I go to the last pc that needs to be cut, line up with 45 cut end with the end of the 1st pc that was put on, mark it at the corner of the table and cut.
Then go back and attach the 3rd pc, then the last.

Never have to measure anything.
This method allows you to test the 45 cut and make any adjustments to the corner before you mark and cut the next corner.

Otherwise as stated, you just add the thickness of your wood to the length of the table.

Example for going around all 4 sides of a table.: 36” x 78” table, (using 7/8” thick wood)
36 + 7/8 + 7/8 this would be the overall length for the 2 short ends
78 + 7/8 + 7/8 this would be the overall length for the long ends

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

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Gshepherd

1727 posts in 1667 days


#8 posted 01-07-2015 10:46 AM

A table like that I would just butt join it and round them babys off, you will thank me later for that one… Even the ankle biters….

-- What we do in life will Echo through Eternity........

View BinghamtonEd's profile

BinghamtonEd

2281 posts in 1835 days


#9 posted 01-07-2015 01:51 PM

I do what Iwud4u does…not measure. I get significantly better results cutting to fit, rather than measuring to cut.

-- - The mightiest oak in the forest is just a little nut that held its ground.

View waho6o9's profile

waho6o9

7174 posts in 2042 days


#10 posted 01-07-2015 01:54 PM

“Never have to measure anything.”

Wise^

Excellent advice above as well.

View ChefHDAN's profile

ChefHDAN

808 posts in 2315 days


#11 posted 01-07-2015 02:00 PM

Yep, slap it up alongside where it’s going and mark it, work your way around the table unless you’ve got one of those wood stretcher thingys to make the board longer when you cut it a 1/4” short

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

View Moron's profile

Moron

5032 posts in 3359 days


#12 posted 01-07-2015 04:29 PM

always make/purchase more crown then you think you need : )

Im not sure why anyone would put crown around the perimeter of a work bench top ?

-- "Good artists borrow, great artists steal”…..Picasso

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TheFridge

5765 posts in 951 days


#13 posted 01-07-2015 05:15 PM

I just measure, mark and cut it upside down using the direct measurements from whatever I’m trimming.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View Rick's profile

Rick

8287 posts in 2498 days


#14 posted 01-09-2015 03:16 AM



always make/purchase more crown then you think you need : )

Im not sure why anyone would put crown around the perimeter of a work bench top ?

- Moron

He didn’t use Crown Mold. The top is 1/2” OSB covered with 3/4” MDF. Personally I would have left it at that and rounded the corner 2×4’s off a bit. Done.

What he did use looks like 1”x6” Pine which is what he wanted the 45 Degree advise for.

I would have also put the 1”x6” Apron on first and extended the 2 piece top over top of it.

Oh well. As long as Ed is happy with it, that’s the important part.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

-- Hope Everyone Is Doing Well! .... Best Regards: Rick

View edwood1975's profile

edwood1975

495 posts in 808 days


#15 posted 01-09-2015 05:32 PM

I thought you were calling me a moron.. My bad….if you read my post it was not crown moulding.. I agree It would look terrible…

I used 1×6 to finish the bench had some lying around and decided to use it…. moron I didn’t realize tget was your username…

I tagged it as inappropriate …. VERRY SORRY

-- Ed

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