|
Produce a cleaner edge than regular staright flute bits and with better debris removal. :)These spiral bits are great for mortising or general plunge or dado/rebate cutting. Usual high quality freud bit. Why not. Because if you do, you will end up buying more of them.
On the other hand, if you had a 1/4" bit, with a 1/2" shaft, you could only plunge to the depth of the bit head. The sharp tips and convoluted design contribute to that. Using a plunge router, and the Freud 1/4" diameter flute up spiral bit with the 1/4" shank, I plunged and routed out the mortise in successively deeper plunges. Of course this bit is ideal for making lock mortises as well. Being new to making mortise and tenon joinery, I gave it a shot using this bit.
Anything that requires a perfectly flat and smooth bottom and walls. Even the walls of the mortise gave no clue as to where the first pass was. It is easy to control, whereas it doesn't give you the "catch and pull" of a standard bit. Hope this was helpful. So the same rule applies to the 1/2" spiral bit, with the 1/2 shaft, and it gives you an even longer shaft, which enables you to make deeper mortises. They both remove a lot of material very quickly.
It turned out perfect. The fit was snug. The 1/4" enables you to use smaller templates. I made up a template out of 1/4" plywood, that was precisely oversized to allow for the distance from the outside of the collar to the edge of the bit. Get both. Since the shaft is the same size, you can go as deep as the length of the bit allows.
In 3 passes, I had made a perfect 1 1/2" mortise. The advantage to having the spiral bit the same size as the shaft, is that you can plunge deeper.
I have made more than 20 boxes with them. I have been using the second bit on my LEIGH dovetail jig and it is still as sharp as the first time I used it. They are very good bits. I bought two 75-102 bits and the first one broke on my second use. It felt like a factory defect because I wasn't even exerting pressure.
|
