At 11:59 AM 6/15/2010, John Rodgers wrote: >I would like to add at this point - if you can find them - get >Silver & Deming drill bits. You will pay a premium - but you won't >be sorry you got them. > >When it comes to difficult drilling, Silver & Deming are the best >bits ever. They are often used in machine shops and in machine >lathes because of their ability to drill really hard materials >finely and accurately and yet keep the cutting edge throughout the >process. Cutting oil is essential however, as with all hard metal drilling. Dear John, We can discuss twist drills off-line, if you like. But for clarification, Silver & Deming are stub-length drill bits made with a reduced shank so you can use them in a drill motor with only a half-inch chuck. They can be made of any material and to any quality. Leaving aside the Silver & Deming part, stub-length drills are much favored in the machine trades because they're a good deal stiffer than jobber-length, and less inclined to wander. Yours, David |
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