Errol sez: "I will look at the plans tomorrow to see if they hint at
why S.S. is called for. My bet is that it is what the original guy
had on hand."

I'd almost bet on that. There couldn't be any strength considerations in engines of that small
size.

Bob Swinney

"Errol Groff" wrote in message
...
On Sun, 22 Mar 2009 16:00:12 -0500, Ned Simmons
wrote:

On Sun, 22 Mar 2009 16:52:56 -0400, Errol Groff
wrote:


Two of my students are building model hit and miss engines. The
drawing calls for stainless steel for the connecting rods but does not
specify what grade. The part will be made from .4375 diameter rod
stock.

Suggestions please on what grade to use keeping in mind that they have
no experience with S.S. so machinability is important. Will probably
order the stock from Mc Master Carr and they list a bewildering
variety of grades.

As long as there's no welding involved, type 303.


Thanks guys.
Errol