Search found 109 matches

by Wolfgang
Thu Sep 03, 2020 2:09 pm
Forum: Site Software Questions and Answers
Topic: Thinking of posting pictures?
Replies: 68
Views: 418276

Re: Thinking of posting pictures?

Test Hi Steve! I believe that locomotive was James Scott's Princess, or was it Duchess? It's a 4 cylinder locomotive that James purchased off the Turnbull brothers in 1980 or so. It was well-worn since it was completed in 1949. Sooo, James being a competent steam engineer in his avocation (He and I...
by Wolfgang
Wed Aug 19, 2020 10:40 am
Forum: General Discussion
Topic: Mt2 tooling adapter?
Replies: 20
Views: 3148

Re: Mt2 tooling adapter?

I kept the open unsealed/unshielded bearings, and put in a squirt of automatic transmission oil in the top oiler every time I use the machine. The bearings I replaced were regular radial ball bearings. Their spacers pre-loaded them to eliminate any radial clearance. Measuring the spacers I was surpr...
by Wolfgang
Tue Aug 18, 2020 11:52 am
Forum: General Discussion
Topic: Mt2 tooling adapter?
Replies: 20
Views: 3148

Re: Mt2 tooling adapter?

The M head wound up on my bench a a very reasonable cost; hence I put up with some deficiencies such as the slot above the M2 socket which requires modification of the collets... I could not determine the purpose of this slot because it is not accessible. It is located between the two bottom bearing...
by Wolfgang
Sun Aug 16, 2020 12:17 pm
Forum: General Discussion
Topic: Mt2 tooling adapter?
Replies: 20
Views: 3148

Re: Mt2 tooling adapter?

I just re-built a Bridgeport M head and put in a set of brand-new angular contact ball bearings... During the disassembly I was impressed by the clever design of the draw bar. It is a jacking type design that pushes the M2 collet or tooling shank from the socket so that the spindle bearings are not ...
by Wolfgang
Sat Jul 11, 2020 11:11 am
Forum: General Discussion
Topic: Setting up first shop
Replies: 20
Views: 3104

Re: Setting up first shop

OP: You stated "a small steam locomotive" so I assume a 3/4" scale model. You have a drill press, so the next tool to buy is a lathe. A 9" or 10" lathe is ample for a 3/4" model locomotive. I agree that a good used American/Canadian/ German/Austrian lathe is the preferred way to go (I have an Emco M...
by Wolfgang
Sat Jul 11, 2020 10:30 am
Forum: Build Log
Topic: A Real Dirty Job
Replies: 172
Views: 90036

Re: A Real Dirty Job

If you're going to machine a part "all over" you might as well start with hot rolled steel as I think it is less expensive than cold rolled. Stressproof also distorts when machined unsymmetrically, as for example for crank shafts; however, the beautiful machinability of this steel, plus its strength...
by Wolfgang
Fri Jul 03, 2020 9:23 am
Forum: Build Log
Topic: A Real Dirty Job
Replies: 172
Views: 90036

Re: A Real Dirty Job

Hi Don. Methinks the stresses, and stress reversals, in model equipment are much lower than in the full-sized hardware such that fatigue failure is much less of a problem. In my opinion there should be no gap between the the tender buffer and the locomotive buffer. The locomotive CYCLOPEDIA shows a ...
by Wolfgang
Wed Jul 01, 2020 12:29 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 172
Views: 90036

Re: A Real Dirty Job

Don's draw bar is a classic case of an eye bar design, which was used in many bridge designs over the last 100 years or so. With some failure of individual bars in the area that is not apparent to the un-schooled eye. The area in question is the transition between the parallel shank of the bar and t...
by Wolfgang
Tue Jun 09, 2020 1:45 pm
Forum: Live Steam
Topic: how to design an axle pump in 3/4 scale
Replies: 17
Views: 4672

Re: how to design an axle pump in 3/4 scale

Over the years I've made many boiler check valves for model locomotives and model stationary boilers, both for myself and for friends... Serious investigation into the adjustment and flow of these valves were carried out by a friend who had acquired a 3/4" LMS Princess 4 cylinder locomotive built by...
by Wolfgang
Wed Jun 03, 2020 12:17 pm
Forum: Live Steam
Topic: how to design an axle pump in 3/4 scale
Replies: 17
Views: 4672

Re: how to design an axle pump in 3/4 scale

Properly designed and built, the pump shown in the drawing is a true double-acting pump; provided that the cross sectional area of the piston is twice that of its piston rod. This volumetric relationship ensures that 1/2 of the piston's displacement goes to the boiler and the other 1/2 goes into the...
by Wolfgang
Fri Mar 06, 2020 2:28 pm
Forum: General Discussion
Topic: Turning small diameters, right/wrong way
Replies: 17
Views: 4797

Re: Turning small diameters, right/wrong way

Of course one might support the small dia. outboard end on a male of female centre. The work is less than 4 dia. long thus not really problematic ie. a steady rest or travelling steady are not warranted. Couple of points though: On small dia. turning it helps if the turning tool is really sharp and ...
by Wolfgang
Sun Aug 11, 2019 4:46 pm
Forum: Upcoming Events
Topic: Southern Ontario Model Engineering Conference
Replies: 0
Views: 4080

Southern Ontario Model Engineering Conference

This annual gettogether of model engineers is held in Hamilton, Ontario, Canada, on Sunday September 15., 2019, 10 AM to 4 PM. All model engineers are invited. There will be free food and free non-alcoholic drinks, salads, etc. There will be display tables under a 20 x 40 foot canopy close to the mo...