Yes I guess you will want the 20 and 40 tooth gears so that the Norton Gearbox gives the expected TPI or pitch. My YouTube Channel and Playlist about using an engineers lathe: /evan-e-cent or go directly to Evan's Boxford Lathe videos Project to build a Greek Hero steam engine and measure its power output: Displays drill sizes for tapping threads at any percent thread depth (with full explanations). There are specifications for many thread types eg metric, UNC, BSW, and BA. It also includes calculations for taper turning by the tailstock offset method, and cutting speeds. Try my Free Online Gear train Software: You enter a thread pitch or TPI and it shows you a range of gear trains and gearbox setting to use and even a scale drawing of the gear train. Evan Lathe: 1955 Boxford Model A with screw cutting gearbox, power feed with several accessories, hand tools and a pillar drill press. If you need any help or have any suggestions let me know! You will find that you can get all the standard and most non-standard threads with a wide variety of gear train setups. In the Choose Lathe section scroll down to Norton Gearbox imperial. In the meantime however, you will find that you can probably get all the threads you want using my free program using the link below. Evan For free gear train software: RideTheGearTrain.Hi Martyn and Welcome! Yes I guess you will want the 20 and 40 tooth gears so that the Norton Gearbox gives the expected TPI or pitch. It is a good idea to read the full instructions in the help section to understand its capabilities. It can also calculate any missing value in most cases. Click it, There are many different ways you can enter data. Just go to the main menu and find the button with an orange border for Taper Turning. This program is independent of the gear train calculations and you do not need to enter any lathe data. I have reposted these instructions under a new message topic so that it can found by search at a later date, and to emphasize that it is something different to gear train calculations. Detailed diagrams help in understanding the data. This completes all the details so all you have to do is enter the length of bar-stock (which is the same as the distance between centers), and it calculates the tailstock offset for you. But you can use drop-down menus to choose a standard taper eg Morse Taper MT3. Morse tapers and other standards are provided as drop-down menus, or you can enter your own specifications using one of 6 different ways of specifying the taper. This program calculates the offset required. Turning a taper by tailstock offset method - a new feature for.
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