![]() Your idea of using the pitch of a special thread as a guide for grinding the relieved surface of drill tips sounds interesting, some commercial drill grinder use a similar technique in form of axial control curves embedded in the drill fixture bearing. If total failure, it means food for my future projects.Īs I’m concerned with the drill subject too I will take the chance and try to explain a little bit about the mysteries of the helical tool called drill, hoping not to jam your interesting and already started article here? That's the main reason, why I'm going to make and test this thing in a hard way. I admit, that I have examined the Drill Doctor -devices patents, among many others, but haven't got the grasp of any of them. If 10mm drill takes ~90 degrees, 1mm takes only ~9 degrees.ĭuring that ~9 degrees, it has to rotate ~90 degrees, just like the 10mm drill does.īernd: It's not intentional. With 1mm drill, it has to be eccentric, if same size jig is used, as on 10mm drill. It takes ~90 degrees turn to sharpen using the jig. Let's take a 10mm drill as a reference, that's eccentricity is 0. Smaller the drill, the more eccentric the jig. Other solution might be to use an eccentric jig, whose eccentricity depends on the drill size. Possible (although laborious)solution: To make different size guides (the cylindrical brass part, see my previous posts), that have diameter, that matches certain drill sizes, all having 4.65 mm pitch. Sbwhart: Yes, I'm on the same track, that the drill diameter is (one of) the key factor(s).
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