Search found 650 matches

by rudd
Tue Jan 14, 2020 9:36 pm
Forum: Live Steam
Topic: CSME Double Tracking Progress
Replies: 12
Views: 3824

Re: CSME Double Tracking Progress

What a beautiful place for a RR.
by rudd
Sat Jan 11, 2020 8:39 pm
Forum: General Discussion
Topic: heat shrink fit
Replies: 36
Views: 1089

Re: heat shrink fit

One thing I considered after looking at Liveaboard's post at the top - that red hot block is going to transfer quite a bit of heat into the shaft. The block is then going to shrink, with the shaft being the last to cool. I think it's quite possible the shaft will be "shrunk" by this, leading to less...
by rudd
Tue Dec 31, 2019 3:57 pm
Forum: Live Steam
Topic: Worthington Duplex pump & Brass Hex head screws
Replies: 27
Views: 1552

Re: Worthington Duplex pump & Brass Hex head screws

These folks bought out American Model Engineering, which made imperial sized miniature fasteners. http://www.godshallscustommachining.com/american-model-engineering-supply.html Here's the catalogue from the original website. http://www.americanmodeleng.com/id14.html Here's a place with metric and im...
by rudd
Tue Dec 31, 2019 3:39 pm
Forum: Live Steam
Topic: Allen Mogul: Packing in saddle assembly?
Replies: 12
Views: 1243

Re: Allen Mogul: Packing in saddle assembly?

used moulding sand. A core that the foundry was too lazy to remove after the casting was poured? Possibly, but this casting had a steel plate bolted onto the bottom that was the whole size of the saddle, and the sand was packed around the steam/exhaust pipes. The sand was tight against the steel pl...
by rudd
Mon Dec 30, 2019 8:25 pm
Forum: Riding Scale Railroading
Topic: 0-6-0 diesel yard switcher
Replies: 15
Views: 3143

Re: 0-6-0 diesel yard switcher

Going back to college physics, we were all a bit surprised to learn that the area of contact was not a factor in the equation for friction. Friction is calculated simply Frictional force = force normal to the plane x coefficient of friction. Axle loading is a real good reason to have more axles thou...
by rudd
Mon Dec 30, 2019 8:05 pm
Forum: Live Steam
Topic: Allen Mogul: Packing in saddle assembly?
Replies: 12
Views: 1243

Re: Allen Mogul: Packing in saddle assembly?

In 12" = 1'-0" scale, we had a little Porter 0-4-0T at the museum - I mean TINY for standard gauge. That area was packed full of what I now believe was used moulding sand. It was really hard to dig out. The smokebox was open to the cavity for the steam & exhaust piping, so the sand was probably the ...
by rudd
Thu Dec 05, 2019 8:19 pm
Forum: Live Steam
Topic: Cylinder Borning
Replies: 20
Views: 2311

Re: Cylinder Borning

My lathe does not have T slots in the saddle. I got a small piece of aluminum tooling plate, a hunk-o-steel that I turned to match the "spigot" that is on the bottom of the top-slide, and bolted them together. Take off top slide, install tooling plate ass'y, ready to go. The quill on my mill did not...
by rudd
Sat Oct 26, 2019 3:58 pm
Forum: General Discussion
Topic: VFD setup
Replies: 28
Views: 4455

Re: VFD setup

Braking uses some add-on capacitors if you want very much braking at all.
by rudd
Tue Oct 22, 2019 7:23 pm
Forum: General Discussion
Topic: VFD setup
Replies: 28
Views: 4455

Re: VFD setup

First line of the instructions is a clue. In V-H mode, you reduce the frequency, you reduce the voltage. You want vector mode for better torque at lower frequencies. You could use one VFD to run two motors, but the VFD needs to be shut down before any connections are changed downstream of the VFD. A...
by rudd
Tue Oct 08, 2019 7:41 pm
Forum: General Discussion
Topic: Dead 3/4 hp motor - starter capacitor?
Replies: 10
Views: 2507

Re: Dead 3/4 hp motor - starter capacitor?

When I have had a dead start cap, the motor hums but doesn't spin, unless you spin the pulley to start it.
by rudd
Sun Sep 29, 2019 7:58 pm
Forum: Lathes
Topic: Trying to ID this older lathe
Replies: 13
Views: 3785

Re: Trying to ID this older lathe

Yes, the dials are .250 per turn, so (2) 1/8'ths. I was trying to make the point that the X and Y harken back to imperial fractional measurements, rather than just using decimal inches. Having come of age in an aircraft shop, I'd prefer everything were in decimal inches with no "nod" to fractions. T...
by rudd
Sun Sep 29, 2019 7:21 pm
Forum: General Discussion
Topic: Fan Boy
Replies: 21
Views: 3735

Re: Fan Boy

OSB or "waferboard" in lieu of gypsum board. A bit difficult to paint, but you can hang stuff anywhere. I put in R13 walls and R20 ceiling when I did my shop, and built the "big doors" with R-13 in them. I have a little over 500 SF. One man door, the "big doors" and a tiny window positioned so I can...