Average Customer Rating: 
(5 reviews)
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Dadoes & Grooves (5/5), Nov 2, 2008
By Norman La Belle
(Gurnee IL US)
I realize most folks use the spirals to cut mortises, which they excel at. I'm using a 3/8" spiral downcut to make dadoes or grooves in hardwood ply for casework, making the groove in 2 passes, adjusting the 2nd pass to EXACTLY size for ply shelving. A little more work? Yes. Worth it? Definitely, as the groove is sized correctly for the wacky thickness variables of ply, and the downcut bit leaves razor sharp edges to the ply with absolutely no tearout. When finished, it fits and looks great. Isn't that what we all search for?
5mm Shelf Hole Boring - Down Cut (5/5), Oct 22, 2008
By Christopher Hoxie
(Lutz FL US)
If you are looking for 5mm shelf hole boring, they are hard to find. I did my research and these are the least expensive and of excellent quality. I am boring shelf holes in pre-finished birch veneered plywood using a plunge router @ 18,000 rpm. My cabinetry needs to have perfect holes and the down spiral bit does the job perfectly, although you need a good blow gun to clear the chips from the holes. Also, you must move the bit quickly because I got a little bit of burning in the hole if I lingered at all. I'm going to try turning the speed down some on the next set of cabinets. I've bored over 1300 holes so far with the first bit and even though there is a slight discoloration to the bit from heat build up, the holes are still perfect. I purchased some upspiral bits and although they left the hole chip free, the edge was slightly frayed and not good enough for me.
As for me, I will continue to buy my down spiral bits from MLCS until I "pony up" for a multi spindle boring machine and I imagine I will buy those bits from MLCS also.
(5/5), Oct 22, 2008
By Al Killian
( NY US)
Purchased one a few years ago for makeing groves for a project. It worked great. Used it yesterday to remove a profile off a door to replace the flat panel on the door. It made it easy to free hand without crabing or trying to take off.
Clean cutting spiral bit (5/5), Oct 15, 2008
By Marc Rea
(Sierra Vista AZ US)
I needed a deep mortise in a table leg made of 2 sheets of 3/4" plywood laminated together. The 1/2" up spiral bit, number 7468, did great! With its 1 1/2" cutting length it had no problem reaching through the 1/2" template and through the 1 1/2" table legs! of course, I made several passes, but the bit cut like it was going through butter.
Excellent price for an outstanding bit! Get the set and get ready to route some mortises.
Spiral up & down cut bits (5/5), Oct 15, 2008
By David I Gassner
(LEBANON OR US)
I have used these bits many times, and have learned to love them. They cut quickly, and cleanly. I do not use strait bits near as often now.
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Spiral Upcut/Downcut Instructions (PDF)
