I cannot cut a straight line to save my life and I want the floor cutouts to be reasonably straight. I remember i read about this guide somewhere (I will not take credit for the idea) and tried to build it from memory. It is very easy to make and took me about 15 minutes total.
The jig is simple and can be made in any desired length. I chose 4 feet so I could cut across a sheet of plywood with ease. The materials are simple, the base is a 12 x 48 x 0.5 inch sheet of MDF. The guide rail is a 3.5 x 48 x 0.5 inch piece of poplar.
Together they are only an inch thick.
Then I measured the width of the base of the saw (mine is 5 inches) and set the guide rail one quarter inch further than needed so my first cut along the guide set the distance exactly. The rail is attached with screws and glue.
Now, when I need to make a straight cut, I can just line the edge of this guide along my line, clamp down the guide and cut! No more measuring fence distance and hoping everything comes out right!
Hope this helps someone else too!
