Re: Geometric Self Opening Die Heads

"Bob La Londe"  wrote in message news:v7eo4m$35uch$1@dont-email.me...
On 7/13/2024 11:31 AM, Bob La Londe wrote:

Geometric Self Opening Die Heads

Another groups take on the subject:
https://bbs.homeshopmachinist.net/forum/general/2095061-geometric-self-opening-die-heads#post2095515
After reading all the comments I have concluded that geoseismic button
taps are bad for single point reaming.
Bob La Londe
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"For that matter, at one time, not so very long ago, in terms of history, NOBODY had made such good threads. But somehow, those poor crawling and ignorant cretins (who would not be allowed by the forum police here to even discuss the matter), managed to make very accurate threads, despite the fact that they had no prior experience making them, and had never even seen such an accurate thread until they made one. And they made good micrometers that had those threads.
I will guarantee that none of them used dies or dies heads to make those threads. More precise methods were needed."
Holtzapffel described the early crude and precision threading methods in detail. It turned out that an angled knife blade carving a spiral on a rotating rod was about as good a method as any other. The simple way was to tin a brass rod and wind a clean brass and black iron wire side by side around it, press then together and dip in solder, that wouldn't stick to the black iron which was unwound afterwards, leaving the brass wire spiral.