Herb Stoops· Registered
The only time I used a spiral bit was making sink cut-out in vanities,and I don't remember which it was up or down. All my bits are straight and I am happy with them.
That was my thinking too ,but it does not make them more inefficient than before. They run from 1/8"-$22., to 1/2"-$93 new, so it wouldn't pay to resharpen the smaller ones, when shipping is included, IMO.Yes, they are sharpened on the same machines that make them.
I'd be surprised if Whiteside sharpened spirals for free. We usually pay about $20-$25 to have 1/2" spiral bits sharpened. Sharpening a spiral bit is not a fast process, and the grinders can cost $500,000.
And when they get sharpened, they get considerably smaller, depending on how worn they are. The bits we get sharpened usually end up about .015-.02" smaller with each sharpening.