However, if you want to account for the rabbet that you set the picture into then you have to do a bit more math. If with the same board you cut in a **1/8 rabbit** then the space that the picture will be resting in will be the length of the inside edge plus a **1/4 inch** (*that’s twice the rabbet size*) making the total space for the picture **8 1/4 inches **In the picture below on the right side, that’s a 1/8 indicating the size of the rabbet.

if you wanted the space for the picture **8 inches**, then you would make your frame **1/4 smaller**. so instead of 12 inches you have 11 3/4.

Now my math mathematical to this is the following. (you will have to used this equation for both sides of the picture frame.

(length of picture) + 2[(width of board)-(width of rabbet)]= (outer length of frame)

or

length of picture) + 2(width of board)-2(width of rabbet)= (outer length of frame)

in a prettier version with

picture length=**P**

board width=**B**

rabbet width=**R**

Total=X
**P**+2**B**-2**R**=**X**

or
**P**+2(**B**-**R**)=**X**

and to apply that to the situation i was talking about earlier with

picture length=8

board width=2

rabbet width=1/8

Total=X

8+2(2-1/8)=X

8+2(1 7/8)=X

8+3 3/4=X

11 3/4=X

or

8+2(2)-2(1/8)=X

8+4-1/4=X

11 3/4=X

But honestly, if you have the picture in front of you it’s a hell of a lot easier to go by eye and pencil marks. and it’s always important to take your time and make sure you have the miters going the correct way. I once cut a frame where all the miters where parallel to one another on each board. no fun.

Hope I helped

~Pat

I’m starting out with some nice 3/4 beetle kill pine and re sawing that to 3/8th on my dinky 10in craftsman band saw. The pine is soft and is only 2 inches tall so it can handle it. Next I’m going to use my bench top planer to get them to a equal thickness of 1/2. The sides of these boards aren’t flat either so after I i plane the thickness I’ll stack them together (maybe tape them together with some carpet tape) and send them through the planer on there sides. I don’t have a jointer so I have to be creative. And this way I will not only get a flat and square side, but I will also have a consistent width with all my boards. I’m excited to use my planner because this will be the first time i have ever used it for a project.

I would also like to get an opinion. Do you think it would be better to plan the sides and glue the boards together that i have to glue and then mill it to 1/2 thick? or should i just stick to the method stated above?

thanks for reading

~Pat

Thanks for reading

~Pat