Thread: How do I get precise 45 degree corners?

Out of all the methods that I've tried over the years, the method shown here has given consistently excellent results. The beauty of finishing off on the linisher is that the matching lengths can be made EXACT.

I do mine the same way as Harry, except that I have the inside of the box against the fence. That way, if you've marked the length with a marking knife, as you get to the correct length you will see a small feather that tells you you have the correct length.

I see what you mean Alex but because I start out with identical lengths, any error will be quite small, so I dab the wood against the sander then compare the sides by holding them back to back, if it's still longer then back to the sander if however it's now too short, the other one goes onto the sander. I've never had a proposed 230mm box end up only 180mm!

have a look HERE

Here is how I do them on the table saw

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I roll the blade over to 45 deg using my digital angle meter

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Using a sled built specificily for mitres and using a stop block so I know the pieces are the same length I make my cut

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The mitre before gluing up

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After glue up

I get consistently good mitres this way