Jesse , I had a loco with pressed in crank pins that slipped in use, it would have been a big job to strip & put in grub screws so a spot of weld solved the problem, easily ground off if necessary. E.W. ----- Original Message ----- From: "JESSE LIVINGSTON" <fernj1@xxxxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Saturday, March 26, 2005 7:40 PM Subject: [modeleng] Re: Someone has to do it . . . . . > Ah Ha! > > Now I see where you are heading Harry. I wonder if the British lokies > also > used a tapered crank pin? I always wondered how those valve motion cranks > could be made tight enough to not slip at some time since they seem to be > just clamped to the pin. Of course with piston valves there is no real > stress that might cause slippage, but slide valves are a different can of > worms altogether. Anyway, I have never had to worry with the return crank > since my lokies all have Stephenson gear with four eccentrics, well, all > but > the Filer and Stowell which has no eccentrics or valve motion at all. > > Now, you gonna have to put a sign on your lokie detailing the crankpin > design or it will be totally missed by us plebeians! [:>) > > Jesse > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email to, > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject > line. > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.