How much end play is allowable for axles? Al Messer --- Phill Smith <steam@xxxxxxxxxxxxxx> wrote: > Barry, > > Do it with the "thou per inch" interference fit, and > shrink them on. > > The best way to do this accurately (and so they > can't come of through > continual cornering) is to put a small step on the > inside of the rim, with a > matching inner bore in the tyre. When running, the > forces of the engine > going around a curve are trying to push the tyre of > the rim towards the > frame. To counter this, the shoulder is normally > made around 80 - 100 thou > (2 - 2.5mm) wide and 20 - 40 thou in step. There is > no need for this step to > be a press fit, but I make it so anyway. It is also > under the flange so it > can't be seen..... But the best bit is that it acts > as a stop for the tyre > when it is dropped on, which locates it square, and > at the correct position. > > Oh........ One other thing. Don't be tempted to > increase the interference > fit, as the stresses may be increased enough that > the rolling stresses > (compressive stress) may permanently stretch the > tyre so that it comes > loose...... I have seen a loco have this problem. > > > Cheers, > > Phill. > > ----- Original Message ----- > From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx> > To: "Model Engineering List" > <modeleng@xxxxxxxxxxxxx> > Sent: Friday, November 18, 2005 1:48 AM > Subject: [modeleng] Steel Wheels > > > > I have just acquired, at great expense, a piece of > steel tube 8" I.D. and > 3/4ins. wall thickness. I am about to start > machining it to produce six > steel tyres which I intend to shrink onto three > pairs of existing, cast iron > wheel sets (after machining off the current treads). > The plan is to make the > tyres with one thou per inch of interference, expand > them with heat then > shrink them onto the wheels. > > Before I pluck up courage to do this job does > anyone have any advice to > offer? > > > > Barrie > > 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. > __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com 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.