I only have to guide the drill along my jig to make the holes, I don't have to push on the drill. That point style punches the PVC with just the weight of the 3/8" Bosch Drill I use to drill with. Now, using my Drill Doctor, making a 135 degree split point, I can do the same drill job on one sharpening and in 30 minutes. This used to take three hours and lots of re-sharpening with a Black & Decker bit sharpener. A typical drill job for this will make over 1500 holes in the PVC I have to drill. I use a 5/16" drill bit for making a reduced suction velocity double shroud for cooling submersible electric motors. Now, I haven't resharpened all five sets, just a few dozen of the bits that we use the most. I also got it to resharpen the five sets of drill bits (1/16" to 1/2" x 1/64") we have around the shop and on the truck that were destroyed by an ex employee that said he was an "expert" at hand sharpening drill bits. I bought the Drill Doctor to resharpen an $80.00 investment of Silver & Deming HSS bits I needed to rework the head stock of our pump pulling rig. I cannot sharpen a bit by hand to save my life. My dad can sharpen bits by hand, but he has enough natural twitch for it to work right. I have the Drill Doctor 750 DLX and I absolutly love it. When there isn't time to send a big bit out for sharpening, you either do it by hand or the job doesn't get done. Fine for the home shop but limited in value when you need to sharpen a 3" bit. Problem is, most small commercial grinders are limited toġ" or slightly larger. For most people, machine grinding is faster & more consistent. Equal flute length, equal angle, just enough relief behind the edge that nothing rubs. Equal flute length is critical - the flutes have to be within 1/64" of each other in length, or the point is not centered & the bit will drill oversize.īoth hand grinding & machine grinding generate the same drill point profile. No machinist at our shop goes to the grinder without a drill guage, even the boss with 30+ years experience. 010" or less, though it may take two trips to the grinder. Most days, my hand sharpend bits will hit. Under 1/2", the finished hole should be no more than. Tap drill for NC or NF machine thread? Needs to be close to correct size. The taper of the tap widens the hole with each turn. Tap drill for NPT? Doesn't have to be too close. Hole for a dowel pin? Drill undersized, ream to spec. Whether the hole is round, oval or square, as long as the bolt passes through the hole is OK. This is an essential requirement so that the cutting edges will work equally and bore a round, straight hole, which is not larger than the drill diameter.Ĭopes with drills from 3 mm (1/8") to 22 mm (7/8").The degree of accuracy for which a drill bit is sharpened depends on the application.Ĭlearance hole for a bolt? 1/16" over bolt diameter on small sizes, 1/8" over on larger sizes. The drill holder as well as the guides are made with the highest precision to ensure that the lengths of the two cutting edges will be equal within close tolerances. You can for example minimise the burr, which occurs on the exit side of a drilled hole by increasing the point angle and decreasing the clearance angle. This flexibility enables you to give the drill the geometry that works best for each drilling operation. The attachment can be set at any point angle between 90° and 150° and at four different clearance angles. It generates less heat and the life of the drill is therefore also prolonged. With a 4-facet sharpening the chisel edge gets a point instead of being almost flat as on many drills.Ī 4-facet point will not walk and the thrust force required is considerably reduced compared to a conventional cone point drill. Overheating of the steel is usually not noticeable, but the consequences are that the drill will dull rapidly and may even break.īy working with the laws of physics and cooling the edge continuously, the risk that the steel becomes overheated and loses its hardness or gets micro cracks is eliminated. Unlike conventional drill bit sharpeners, Tormek sharpens with water cooling which is gentle on the steel. You can restore completely worn drills as well as broken drills to a perfect shape. The optimal point and clearance angle can be set according to each drilling requirement in regards to drill size and material. You create a 4-facet point which gives the ideal cutting performance. The Drill Bit Sharpening Attachment DBS-22 makes it possible to sharpen drill bits on your Tormek Water Cooled Sharpening System with the highest precision. The complex geometry of a drill bit point makes it very hard to free hand sharpen it correctly. Tormek DBS-22 Drill Bit Sharpener 950970 Fits All Tormeks DBS22
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