cut guide with 45 degree inclined miter jigsaw

Guide for vertical miter cutting with the jigsaw

After making the bearing guide for the jigsaw that allows me to make a perfect vertical cut at 90 degrees in the wood (keeping the cutting blade from twisting vertically), I thought a similar guide might work for vertical 45 degree miter cuts as well. So in this post I'm going to make a guide for cutting wood with the 45 degree inclined miter jigsaw.

The base and support for the bearings of this new guide is basically the same as the old guide. But three changes are necessary.

First, after making the plywood base, the one where I will be able to attach the jigsaw with the help of some screws and wing nuts, I have to cut the slot for the cutting blade at a vertical angle of 45 degrees.


I start by tilting the base of the jigsaw 45 degrees to the opposite side to which I will be using it in this guide. And with that slant I cut the groove in the plywood base.

how to attach the jigsaw to the plywood board

Now I tilt the base of the jigsaw to the opposite side, and in this way, when attaching the saw to the plywood base I have the anchoring system of the cutting blade aligned with the slope of the groove.

support for the bearings that will hold the cutting blade

Secondly, I have to change the rib of the support in which the bearings will go. This nerve I have to put this time flush with the front of the support.

And thirdly, I have to modify the way I put the bearings, since putting them directly on the support with the necessary angle becomes very complicated. That is why I decided to screw the bearings to a strip of plywood. I will put this strip of plywood against the bracket in the correct position and at the correct angle.

cut the bearing bracket

With the jigsaw cutting blade installed I put the strip with bearings more or less in place, adjust the position in which I have to screw the bracket to the plywood base, and also mark where to cut the excess of the strip where I put the bearings.

adjust bearing position

Once I have the part with the bearings ready, I adjust its position with the help of an architect's square (it is the most precise square I have in my small carpentry and DIY workshop). In order to support the square against the cutting blade, as we can see in the photo, I had to remove one of the bearings.

I screw the part in which the bearings go to the support, and put the bearing that I had removed back in place.

guide for vertical miter cutting with jigsaw

I make sure the cutting blade is perfect at 45 degrees on this guide for vertical miter cutting with the jigsaw ...

And I can already miter wood vertical to a perfect 45 degree angle.

cutting vertical miter wood with the jigsaw

I think I will need a bit of skill to use this jig guide, but it will surely be useful for many woodworking projects. And is that after the first tests I am happy with the result when cutting the wood, so it sure helps me to get some nice miter joints.


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