How to chase threads on a manual lathe

 · If you do a lot of threading on a manual lathe, invest in a tool that accepts inserts. The inserts are precisely ground and easily changed. One insert cuts dozens of thread pitches. I learned how to thread on the lathe using the compound infeed method. Contrary to popular belief, the compound set doesn’t have to be at half the thread angle.  · How to cut threads on a lathe is a fundamental skill of any machine operator. This is an intermediate method that is ideal for most applications and lends it.  · Companion video for "Chasing the elusive thread" article in Kitplanes Magazine by Bob Hadley. www.doorway.ru

crazy^millman6, 4 Jaw chuck and mark your 0 and degree jaws to know where to start for those leads and should be good to go. Can be done with 3 Jaws, but mark your 0 and positions. Also mark Your thread chase dial to know which one is your 1st lead and which one if your 2nd lead. METHODS OF MENUFACTURING 1) THREAD CUTTING MANUAL Tap and Die usually for manual cutting of threads tap: a bolt with flutes to provide cutting edges, turned by a handle sets of taps: Taper tap (sufficient for through hole) Plug tap Bottoming tap (ISO 1,2 and 3) before machining a hole has to be drilled t provide the necessary allowance for the threads. Metric Threading on the Lathe. Metric threading using a lathe with an inch lead screw isn't difficult, but instructions that cover the finer points are few and far between. It's a metric world and I now cut more metric threads than anything else. Chances are, if you're not cutting metric threads now, you will be sooner or later.

Feed the compound in to mm for the primary bypass with the use of cutting oil. As you get close to the final pass, reduce the depth of cut to to mm. The process is continued or successive cuts are continued until the thread comes closer to the desired depth or within mm of final depth. Cut a sample thread in the machine of the same spec as the ones you want to chase. Measure the distance from a chuck jaw face to the root of one of the threads with a set of dial calipers. This establishes the relationship between a chuck jaw and a thread, and it should be constant. Potter precision bench lathe Like most other genuine "Precision Bench Lathes" manufacturers, Potter offered the option of a "Chase" screwcutting attachment. The method involved a Master Thread (also variously known as a hob or leader) mounted behind the headstock and driven through a set of changewheels. A "half-nut" pressed onto the Master Thread and conveyed its pitch, via a sliding bar connected to an adjustable toolholder, to the cutting tool which was in contact with the workpiece.