Re: German screws / pencil sharpener
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Hi Charles. I don’t think it is too difficult to cut ‘odd’ threads on the lathe. Given that for most purposes 60 – 70 % contact is good enough. For a friend who was restoring an old toy steam engine, I cut 2.5mm dia x 0.55mm pitch bolts on my 7x12 imperial lathe. They worked out well and did the job. HTH ??????????? Ellis ? ? ? Good question.? You may have to measure threads and diameters to determine what they are.? (Learning how to measure threads is a good idea anyway.)? And whether they are odd sizes (today) or not.? And if an odd size, what is closest. It isn't necessarily easy to make threads with a minilathe in all cases if you are talking about single point threading.? The change gears only support a fixed number of thread choices, and some odd thread pitch probably is not one of them.? Of course, if using a die, that doesn't matter.? But for an archaic thread size you might have trouble finding a die. And then there is the issue of the screw head.? That can be difficult to varying degrees depending on what type of screw head is required. You might try this Groups.IO group: Topics on specialized replica engineering, fabrication and antique tool?restoration?are all fair game.
Created:?10/27/19 ? Charles E. "Chuck" Kinzer
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