Posts: 8,854
Threads: 318
Joined: Feb 2012
Location: Arizona/Minnesota
Does anyone know what the minor diameter is for the outside thread on a 5C collet? It's a 1.238-20 thread but I can't seem to find a minor diameter for it. I know there's a formula for calculating it but that escapes me at the moment.
Ed
Posts: 4,683
Threads: 93
Joined: Feb 2012
Location: Perth, Australia
Take a look here ED Marv probably has a calculator programmed up already...
Attached Files
Minor thread diameter.xls (Size: 15.5 KB / Downloads: 6)
Hunting American dentists since 2015.
Posts: 8,854
Threads: 318
Joined: Feb 2012
Location: Arizona/Minnesota
(07-31-2013, 06:42 AM) Mayhem Wrote: Take a look here ED Marv probably has a calculator programmed up already...
You beat me to it Darren. I just visited that thread and thought I'd post the formula for others to enjoy.
TD = MD - 0.013*DOT/TPI
where:
TD = tap drill diameter
MD = major diameter
DOT = desired depth-of-thread expressed as percentage
Ed
Posts: 4,683
Threads: 93
Joined: Feb 2012
Location: Perth, Australia
07-31-2013, 07:20 AM
(This post was last modified: 07-31-2013, 07:25 AM by Mayhem .)
Here it is as an Excel calc:
Minor thread diameter.xls (Size: 15.5 KB / Downloads: 13)
Yes - I'm home alone and bored. Although, I've just found a 10.5" Douglas shaper for sale that I'm thinking of enquiring about...
Hunting American dentists since 2015.