Automatic Screw Machines a Treatise On the Construction Design And Operation

Cover Automatic Screw Machines a Treatise On the Construction Design And Operation
Automatic Screw Machines a Treatise On the Construction Design And Operation
Douglas T Douglas Thomas Hamilton
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40 has proved satisfactory for materials of the kind mentioned. The end of this tap is ground at an angle of about 55 degrees and is slightly cupped out at the center and backed off as indicated in the end view. The tap should be slightly tapered towards the back for clearance. A groove is ground the entire length of the threaded part after the tap has been hardened. This groove allows the oil to reach the point of the tap and also provides clearance for the chips. When made from Stubb's import...ed drill rod and carefully hardened, this tap can be worked at a cutting speed of from 35 to 40 feet per minute.
Some taps intended especially for threading copper have an odd number of flutes which are cut spirally. The Echols patent tap, made by the Pratt & Whitney Co. , has proved effective for cutting clean threads in copper and tough ma- terials, such as gun-metal, etc. This style of tap has an odd number of flutes and each alternate tooth is omitted, the arrangement being such that each tooth is followed by a blank space on the following land, which, in turn, is followed by a tooth on the next successive land.


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