Two lists are included, one for a lathe having an imperial leadscrew and the other
metric. Do though note that in the case of imperial threads the results are given
in terms of TPI (threads per inch) and metric threads in terms of pitch (the distance
between adjacent turns of the thread)
The values have been taken from a computer program that calculates the result for
every possible combination, in excess of 66,000 when 14 different gear sizes are
available. From this, the program eliminates those less than 6TPI and greater than
50TPI resulting in 37,293 combinations being listed.
In the case of metric threads, around 37,000 combinations result from 13 gears with
24162 of these being listed for all the pitches between 0.5mm and 4.0mm.
The permission to copy this is for personal use only The complete list as presented
is though copyright for other uses
Copying / Printing
If you decide to copy the lists for future reference, rather than return to this
website, this will have to be done one at a time, naming them, typically, pitch0607,
pitch0708, etc. However, if you consider printing them out do bear in mind that a
single list is likely to require some 40 to 80 pages, depending on the number of
combinations and the size of the font used. For all of the lists we are talking many
hundreds of sheets.
Lathe Changewheel combinations
and the thread that results.