What tool do I need to measure mitre cuts for baseboard along walls that are not 90 degrees?

Question

Now that I am tackling the rooms that are pentagons and other odd shapes (it's a weird house) I don't know at what angle to set the mitre saw when I make my cuts for the corner joins on the baseboard.

I am guessing I need to measure the angle where the walls meet, and then divide this in half?... is it the same procedure for both the inside and outside corners? And what tool do I use to measure the angle? I have a tool I used to draw a line on the laminate flooring on an angle but it does not give a reading in degrees.

Thanks!

Answer 1

They sell angle finders at Menards, Home Depot and Lowes in the hand tool section. I have never personally used but I have never had to cut odd angles. Just 45's and 90's. They sell for around 10 bucks.

Answer 2

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RE:
What tool do I need to measure mitre cuts for baseboard along walls that are not 90 degrees?
Now that I am tackling the rooms that are pentagons and other odd shapes (it's a weird house) I don't know at what angle to set the mitre saw when I make my cuts for the corner joins on the baseboard.

I am guessing I need to measure the angle where the walls meet, and then divide this in...

Answer 3

1. Draw a straight line from the angle - in other words extend the angle.
2. Pick a point along that line
3. Measure from that point to both walls ( Height and length).
4. You now have the slope of the line in the form:

m = Height / length
m = rise / run
m = y / x

5. Do the division so you have a decimal number
6. Use the Trigonometry function called arctangent
.. .. .. arctangent ( m)
7. If your angle is greater than 90 degrees you want the opposite of the above angle, so you'll just add 90 degrees to that answer

a. If line rises to the right:
arctangent ( m) = ( angle in degrees)
b. if line rises to the left
arctangent (m) = ( angle in degrees)+(90 degrees)

If you don't want to use this method ( more precise) you could always get a " Protractor" for getting the angle and transferring to a saw.

Answer 4

there are 2 ways to do inside corners. Cope or miter. Its easier for beginners to do the miter in my opinion. You measure your total length for the wall in the case that its less than the lenth of the baseboard. Set your saw up to a 45 degree angle and set your baseboard on the saw exactly how it will sit on the wall and cut it. The longpoint of the miter will be the wall distance. If your wall is longer than your baseboard you need a scarf joint instead of just a butt joint. Do this by making a 45 degree cut in both pieces so that one will overlap the other. Outside corners are done the same way as inside except the cuts are in opposite directions.

Answer 5

It seems I've seen and answered similar Q's to this in the last few days.

CARPENTER states it. I guess I've just never called the tool by it's proper name, but I'm Old school.

You might get answers that say use two pieces of cardboard taped when flush to the angles...or even paper templates traced?

The tool I use looks like a folding knife. It has a hollow handle, and a Blade that can fold back into the handle. The blade might be slotted allowing that it can me moved either way from the pivot point at one end of the handle, and may have a wing NUT to tighten the blade once the handle and blade are Flushed to the adjacent walls. Then one lines that angle to the stock to be cut.

HD/Lowes/Ace carry them, and I've seen them as cheap as in the 3 to 5 dollar range. Worth the expense no matter.

Steven Wolf

Answer 6

One way is to use a Bevel Gauge, available at most DIY stores. Set the gauge to the angles of the wall, transfer the setting to a piece of paper and measure the angle with a cheap plastic protractor. Half the reading is the angle for your mitre. These readings will not be entirely accurate so what I always do is to use scrap pieces cut at this angle and then adjust accordingly.

A second method is to tape two pieces of A4 paper to the floor around the corner. With a piece of base laid flat on the floor and projecting past the corner mark a line on both sides of the base on the paper. Switch the base to the other side of the corner and mark again. You should now have a box marked on the paper, draw a diagonal line through the corners and measure with your protractor.

Answer 7

Angle Finder Lowes

Answer 8

Purchase a universal angle guide it just an aluminum tool with all the angles etched on it in1/2 degree increments . Then all you do is hold your t bevel to it and read the angle.

Answer 9

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