|Project by Marv88||posted 05-02-2015 02:49 AM||2083 views||17 times favorited||7 comments|
I thought I had already posted this one to my projects here but I guess I didn’t so here it is! I frequently cut circles of different sizes so I made this to replace my previous worn out jig and upgraded it with some added features. The router is a Porter Cable 890 series plunge base with through the post dust collection that works extremely well and I use a 3/8” solid carbide up cut spiral bit in a zero clearance hole to stop splintering. One of the main issues I had with the previous version was that as the slot wore out/got sloppy the bit would chatter causing a lot of sanding. To remedy this I made mating grooves in the base/pivot pin assembly and glued 1/8” smooth 2 sides hardboard in the pin assembly which virtually eliminated any side to side movement leaving perfect holes (I got this idea from a thin strip ripping table saw jig I saw here I believe). The pivot pin is a cut off 1/4” bolt with threads tapped directly into the multi ply birch and not shown is a set screw drilled into the end to keep it from backing out. I didn’t want to make this jig as long as the old one but wanted to keep the range so I came up with the idea of a reversible pivot pin assembly with 3 locking bolt locations. This allows a range of about 2 1/2” – 28” depending on which hole is used and which way the assembly is positioned (if I need bigger I can make a longer pivot pin assembly). One of the best features is the tape measure and cursor (made by bending a thin piece of plexiglass) which makes it quick/easy to change sizes with no measuring. Also, the bottom is covered in some scrap Formica with a textured surface that allows it to move smoothly.
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