On 30 Aug 2011 01:55:38 GMT, "DoN. Nichols"
wrote:

On 2011-08-29, Tim Wescott wrote:


I'm basically looking for a steel that'll be suitable for model airplane
crank shafts. The advice that I get from the hobby builders of model
airplane engines is "use 12L14 and don't crash". I'm not going to
discount this -- but it'd be nice to be able to do something on par with
what I buy at the store. So, basically, something that's easy to
machine, but that'll harden up to something between a grade 5 bolt and a
grade 8 bolt.

I don't think that you will find both "easy to machine" and
Grade 5 to Grade 8 bolt hardness in the same metal.


"Stressproof" (a modified 1144) has a yield around 100ksi, about
halfway between grade 5 and grade 8 screws. It isn't as easy to
machine as 12L14, but it's not bad considering its strength. This
table rates it about the same as 1018, which seems about right.
http://www.carbidedepot.com/formulas-machinability.htm

McMaster carries generic Stressproof on p. 3633.

--
Ned Simmons