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Taps/Easy outs
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Posted by greywynd on March 17, 2005 at 09:42:40 from (216.209.119.92):
Thought I add something about taps to go along with the topics below on the easy outs/broken bolt issue. I'm guessing that most of you on here go to the local hardware store and buy a tap when you need one. I know there are a few other machinists/toolmakers on here like myself as well, so hopefully some of them can fill in any blanks I may leave out. Most of the taps sold at hardware stores are 4 flute, straight flute taps. A lot of these are really just designed to clean the threads of an existing hole. Then there's a style of tap that the flutes look like a drill, and spiral up around the tap. These are designed for machine tapping, and require proper conditions for it, and I've found are also prone to breaking if not used right. The style that I prefer, and would suggest to most of you, is usually a 2 flute, with a 'spiral point'. These seem to be the strongest, as they have the most material through the cutting area of the tap. One thing with these is that they are really designed for through holes, as they push the cuttings ahead of the tap. In blind holes, which is what we are dealing with a lot of the time, you can still use them, but, you need to back them out often and blow the chips out. Someone also asked where to buy good taps and left hand drills and the like. Especially with left hand drills, you will have to go to an industrial supply house that sells cutting tools to the machine shops. I'm sure there are some available online, maybe someone can post some links for us. If there are a few machine shops in your area, there will often be a small supplier that may have them in stock, or can order them. Left had drills were originally used for 'screw machines', they could drill while another operation was being performed at the same time. (They can also do it with right hand drills, but sometimes the spindle is reversed for certain operations.) As more and more computer operated equipment is in use, I would hae to guess that the demand for left hand drills is dropping. Been a while since I saw prices on them, but, last I recall, they seemed to be 2-3 times the price of the same size rh drill. Mark
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