SOURCE: Cutting chamfer on oak wood
One way to do it is to use a table saw, with the blade cranked over at an angle, feeding the piece through upright, with the flat against the fence instead of down against the table surface. You can make a very shallow angled cut in this way, and it's accuracy is improved through the use of fingerboards to hold the work against the fence.
If you have a router table with a fence on it, you can set up a panel raising bit and do a fairly shallow cut on the edge of your threshold, but probably not as deep (from the edge) as on a table saw. (Probably only about 1 1/2" vs up to 3").
The most laborious method, but fairly simple, is to make some kind of sled-like jig for the router that will span the width x2 of your board, then mount the board on a large flat surface at the desired angle, and use a flat bottomed bit to essentially plane the board by hand, sliding the router back and forth from end to end, moving it over to make the next pass, and so forth. Slow & dusty, but effective nevertheless.
Here's a link I found with pictures of something like what I was thinking of. Router planing jig
Whichever method you choose, expect to have to dress the cuts with a belt sander to smooth out the machine marks.
If what you're after is a simple 45 degree chamfer, just buy a chamfer bit with a bearing, and if you wish to take more cut than the thickness of your workpiece allows, screw another board flush to the edge underneath to guide the bearing against while you make your cut.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!
Fig. 1: Use the proper tool when installing a cup-type plug
Fig. 2: Use the proper installation tool when installing an expansion-type plug
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