Search found 680 matches

by BigDumbDinosaur
Fri Oct 30, 2015 11:19 am
Forum: Riding Scale Railroading
Topic: Electric Switch - Door Lock Actuators
Replies: 11
Views: 2251

Powered Turnouts

I say avoid powered turnouts unless there really is no alternative. They represent more things to maintain and repair. Having said that, I would not use anything automotive for the actuating means, as the cost to replace it when (not if) it fails could be considerable, assuming replacement parts are...
by BigDumbDinosaur
Thu Oct 29, 2015 9:55 pm
Forum: Build Log
Topic: EMD F7 in SCALE
Replies: 102
Views: 36514

Re: EMD F7 in SCALE

Why did you directly mount everything to the gas engine? When a mass like the hydrodynamic coupling is spinning at several thousand RPM, concentricity with the crankshaft centerline is critical if undue stress on rotating components is to be avoided. The only way to guarantee concentricity is to pi...
by BigDumbDinosaur
Wed Oct 28, 2015 9:09 pm
Forum: Live Steam
Topic: Loco thermal image
Replies: 17
Views: 2291

Re: Loco thermal image

If it wasn't for pollution, I expect it would still be being used, at least for heating. Yeah, unfortunately, bituminous coal is full of semi- or non-combustible junk. I'm old enough to recall when much of our large cities were still being heated by coal. You could cut the air with a knife. If only...
by BigDumbDinosaur
Tue Oct 27, 2015 11:51 pm
Forum: Live Steam
Topic: Loco thermal image
Replies: 17
Views: 2291

Re: Loco thermal image

ccvstmr wrote:...just goes to show how thermally IN-efficient steam locos were (are)...but we still luv 'em! ;-) Carl B.
Efficiency is all relative. American coal is probably a cheaper fuel than Arabian oil.
by BigDumbDinosaur
Tue Oct 27, 2015 11:50 pm
Forum: Live Steam
Topic: Loco thermal image
Replies: 17
Views: 2291

Re: Loco thermal image

A temperature key / color code would be useful. that's an image from a FLIR camera. We've got one at work. Should try that sometime and find out where my insulation leaks are. If you want to see something really discouraging, take a FLIR picture of your home at night in the middle of January. :lol:
by BigDumbDinosaur
Mon Oct 26, 2015 11:28 am
Forum: Build Log
Topic: EMD F7 in SCALE
Replies: 102
Views: 36514

Re: EMD F7 in SCALE

Sounds like you've got what is basically a torque converter/fluid clutch in between the motor and the hydraulic pump. It's a hydrodynamic (fluid) coupling, not a clutch or a torque converter. A clutch is a purely mechanical device in which fluid plays no role in power transmission. A torque convert...
by BigDumbDinosaur
Mon Oct 26, 2015 1:32 am
Forum: Lathes
Topic: Inside Acme thread
Replies: 48
Views: 5566

Re: Inside Acme thread

Had you tackled that project with steel, you'd understand much better what you were told. That's not to diminish your accomplishment in any way. It looks good, and you can be justly proud. Just as importantly, he now knows how to cut a proper Acme thread. The learning experience in itself is very v...
by BigDumbDinosaur
Mon Oct 26, 2015 12:45 am
Forum: Build Log
Topic: EMD F7 in SCALE
Replies: 102
Views: 36514

Re: EMD F7 in SCALE

Andrew Pugh wrote:Nice piece of work!
Thanks!
Are you by chance a mechanical engineer?
No. :)
by BigDumbDinosaur
Mon Oct 26, 2015 12:41 am
Forum: Build Log
Topic: EMD F7 in SCALE
Replies: 102
Views: 36514

EMD F7 in SCALE

EMD F7 in SCALE ———————————————— This posting is a brief digression. I don't plan to post a lot of details about how I made this, or reworked that—TMI tends to turn off readers. However, since Chaski's has a lot of "machinery in general" subject matter, someone might find this interesting. One of t...
by BigDumbDinosaur
Sun Oct 25, 2015 7:50 pm
Forum: Lathes
Topic: Inside Acme thread
Replies: 48
Views: 5566

Re: Inside Acme thread

chrismunn wrote:Don't know how to say this without sounding smug, but single pointing those acme threads was probably the easiest operation of the part! Is she pretty, no.
It does look good.
by BigDumbDinosaur
Sun Oct 25, 2015 7:12 pm
Forum: Live Steam
Topic: Loco thermal image
Replies: 17
Views: 2291

Re: Loco thermal image

Greg_Lewis wrote:I can't find the original source on this but it's in several places on the web. Interesting, eh?
Look at all that energy trying to keep the outdoors warm. :lol:
by BigDumbDinosaur
Sun Oct 25, 2015 7:08 pm
Forum: Build Log
Topic: EMD F7 in SCALE
Replies: 102
Views: 36514

EMD F7 in SCALE

EMD F7 in SCALE ———————————————— Continuing from the above post... powerassy10.gif Above is a view of the fireman's side of the power assembly. Visible are two more solenoid valves and the inlet and discharge fittings of the propulsion oil circuit. powerassy11.gif powerassy12.gif Above is are views...