However, this process can be simplified by inplementing CNC threading technique where a G32 threading cycle with appropriate parameters can be run on a CNC lathe to get the desired Acme threads.Īpart from lathe threading, rigid tapping, thread milling, thread grinding, thread with electrical discharge machining (EDM), thread rolling, and 3D printing are some other widely used methods for acme thread production.
While cutting an acme thread, a clearance of 0.01 inch should be kept between the crest of the screw thread and the root of the nut thread. The optimal wire size can be calculated by multiplying the constant, 0.4872 with the pitch of the thread.įor example, if there are 4 TPI, then the pitch, p=1⁄4=0.25, and the wire size will be 0.4872×0.25=0.1218 inch in diameter. In this method, wires which touch the thread at pitch diameter are considered to be the best size wire.
Machine the thread by feeding the tool using the compound slide.Ĭheck the thread with the mating part or implement the one wire method to measure the threads. Set the compound slide at an angle of 14 degrees and use an acme center gauge to center the tool into the work. This will result into a combined effect of zero back rake angle. Otherwise, the back rake angle must match the tool holder angle. Set the back rake angle to zero when a quick change or open side holder is used. The type of toolholder determines the amount of back rake angle. Locate the reference points of the tool using the cross-feed. Internal ACME Thread General Purpose Size Chart The following table defines recommended industry standard sizes for Internal ACME General Purpose Threads per American National Standard ASME/ANSI B1.5.
Using compound slide, feed the tool into the plane of work. The thread cutting tool must be grounded to the exact angle and contour to produce the precise thread profile. Size chart for ACME threads and their designationĪcme thread cutting is performed by making sequential cuts using a threading tool that matches the desired thread form. Check out Victor Machinery's extensive selection of taps and dies. According to the American National Standard thread size, ANSI/ACME B1.5-1977 is given in the table below. Right hand or left hand thread Follow this link to order right hand and left hand tandem acme taps.
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