I am attempting to install trim on my staircase stringers and i have an issue..I started at the top and cut my vertical @ 45deg , added a short piece across the top and tried lining up a long piece along the stringer to match up at the same angle..For some reason i cannot get this cut proper and after several hours of trying and roughly $50 worth of product i am still staring at it , scratching my head… crazy! im reaching out for some help on this one …hopefully my pics will show my issue
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Draw a line at the top of each molding. Connect the intersection of these lines to the intersection of the skirt boards. That wil give you the angle to cut the trim.
You have to bisect the angle on the right, so that you have 2 of the SAMEangles to cut.
On the left your bisected angles were 2 -at 45 degrees.
the angle on the right is 33deg...ill try matching it and cut the same angle on the trim coming up to it..ill let you know..somehow , because its a chair moulding seems to change things..
Remember that the steeper the angle the longer the length of the cut. Cuts that meet always need the same angle. Try it using some 1x scrap so you are not burning through expensive trim.
Since you have the angle on the stringer go back to geometry class in your mind and try bisecting the angle with a compass.
https://m.youtube.com/watch?v=DioCYwAsRmk
Hi primitive...thanks for the reply ..i am just getting back to this project now because life has been getting in the way...the stringer angle is 147 deg. If i bisect that i get 73.5 deg....i tried and it looks like this...ill send pics...gettin too old for this..lol...no patience..
Think this through a bit more.
If you were to cut 2 pcs of baseboard to butt together. You’d set your saw to zero (90deg.).
Remember, you are cutting both pcs. to get that joint.
If you were making a picture frame. There are 4 corners @ 90 degrees, divide by 2 for each corner……..you have 45 degrees . You cut all pcs at 45 deg.
Your stated angle is 147 degrees. 180 minus 147= 33 deg. Divide by 2. What’s you got?
Now that I’ve reread this I hope I didn’t confuse you even more. This should get you close, fine tune it.
There are electronic protractors that you can use for all sorts of corner cuts. Adjust it to your corner and it shows an accurate angle, then divide by 2.
Wait till you get to crown molding…..
https://www.woodcraft.com/products/starrett-7-pro-site-protractor?variant=43406544142474&gad_source=1&gbraid=0AAAAADiA6Y2lyvOM1E0eaG_IFiwFrQmtC&gclid=EAIaIQobChMIg9OtweyDhwMV8kt_AB0B5AJ_EAQYESABEgJPV_D_BwE&gclsrc=aw.ds
This lives in my bag. I never was good at math. Once you figure out how to read it you’ll never need to do the math.
Good link! Exactly what he needs.
I got a Bosch electronic model a long time ago which gives you the angle and bevel cuts for crown and it sure works well. Bigger and bulkier but was a good purchase. There’s only a couple of have types of store bought crown so most printed angle calcs work but that tool adjusts for unusual corner degrees.
A little putzing around to fine tune a fit isn’t that big of a deal as long as you can manage to hold the long pcs in place to check a fit. Some ingenious “hangers and holders” enable solo installs possible.