Pat Naughtin asked in USMA 20178: > >"Since 1841 attempts have been made at various times to get standardisation >in screw threads. At the present time over two hundred thread forms exist >and about ten of these are used frequently." > >Can anyone help me with the following questions? > >1 What happened in 1841, and who were the main players at that time? > >2 What are the two hundred thread forms (that currently) exist? > >3 What are the names of the ten of these (that) are used frequently?
In my Enclopaedia Britannica 11th Edition, vol. 24, p. 478 I found: "The history of the battle of scew threads in England, America, Germany, Switzerland and France would occupy a volume . The subject is highly technical, involving practical points concerned with manufacture as well as with questions of strength and durability. We can can merely state the fact that the threads now recognized as standard are included in about eight great systems, out of about sixty that have been advoctated and systematized." Joseph B.Reid 17 Glebe Road West Toronto M5P 1C8 Tel. 416 486-6071
