From "Farm Blacksmithing", by J.M.Drew. [The book was first published in 1901. My copy is one of a 'Classic Reprint Series' by
Algrove Publishing.]
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"Cutting threads on bolts is a very simple operation, and needs little description. The standard numbers of threads for carriage bolts are as follows:
1-4 in. bolts 20 threads to an inch.
5-16 in. bolts 18 threads to an inch.
3-8 in. bolts 16 threads to an inch.
7-16 in. bolts 14 threads to an inch.
1-2 in. bolts 12 threads to an inch.
5-8 in. bolts 11 threads to an inch.
3-4 in. bolts 10 threads to an inch.
1 in. bolts 8 threads to an inch."
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At the very least, the author's characterization of thread cutting, and the accompanying table of thread sizes, gives me pause to wonder how many threads the author has ever cut. The thread-cutting operation may be schematically 'simple', but it's not a walk in the park.
Above 1/4" diameter, the turning force one must apply to the thread-cutting die is
considerable. We're talking WORK here. From 1/2" diameter up, the upper body strength of an NHL hockey player would be advantageous. And it's not just turning force that's needed -- the thread-cutting die must be
forcefully pushed along the thread's axis as it's being turned, else the resulting thread will be a poor one. And getting the die started squarely and straightly is no mean feat. "A very simple operation."? Not to my mind in my experience; an operation fraught with peril and difficulty is more like it.
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That paragraph just reinforces my deep suspicion of all of so-called 'education'. Most of it is little more than repetition/reinforcement of schematic orthodoxy, uninformed by actual experience or observation. By and large, 'educators' are merely repeating/reinforcing the same schematic orthodoxies that were laid on them in
their so-called 'education'. They're not conveying true 'knowledge'; they're conveying a
simulacrum of knowledge. That's not progress; that's a
tape loop.
Ironically, an introductory 'Publisher's Note' at the front of the book alleges that the author was a 'craftsman who became an instructor later in life'. Excuse me while I go hit the reset button on my bs detector -- it's clanging and honking and flashing its amber light something awful.
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