- Joined
- Feb 13, 2017
- Messages
- 2,138
As requested:
It must be understood that most of my projects involve small scale models. 3.5mm to the foot. A rather odd scaling, that. 1 inch=0.011", approximately. Of the listed sizes, I keep taps as small as 3/0-120 in imperial, and 1.0mm metric. Dies are used less often and only size to 2/0-90. Metric taps and "screw plates" run from 1.0mm(0.040") and up.
Of the archaic sizes I keep, many dies that I never (yet) use. Mostly as a curiosity, if truth be known. There are many archaic threads referred to as "special". I have never run across them but you never know working with old machines. There are many "holes" in the chart. Mostly, the conversion from one to the other involves a calculator. My eyes just aren't up to it, I get sleepy.
Most of the entries come from charts. Some from my memory. Such as 1mm = 0.03937, Imperial machine screws start at 0.060 plus 0.013 for each size. i.e. #2-56 is 0.060+(2x0.013)=0.086 base diameter. The threads are pretty much standard.
The PDF file, if printed as 8.5X11, is quite legible. The JPG is just for show.
It must be understood that most of my projects involve small scale models. 3.5mm to the foot. A rather odd scaling, that. 1 inch=0.011", approximately. Of the listed sizes, I keep taps as small as 3/0-120 in imperial, and 1.0mm metric. Dies are used less often and only size to 2/0-90. Metric taps and "screw plates" run from 1.0mm(0.040") and up.
Of the archaic sizes I keep, many dies that I never (yet) use. Mostly as a curiosity, if truth be known. There are many archaic threads referred to as "special". I have never run across them but you never know working with old machines. There are many "holes" in the chart. Mostly, the conversion from one to the other involves a calculator. My eyes just aren't up to it, I get sleepy.
Most of the entries come from charts. Some from my memory. Such as 1mm = 0.03937, Imperial machine screws start at 0.060 plus 0.013 for each size. i.e. #2-56 is 0.060+(2x0.013)=0.086 base diameter. The threads are pretty much standard.
The PDF file, if printed as 8.5X11, is quite legible. The JPG is just for show.
Bill Hudson
