O Scale Trains Magazine Discussion Forums

Welcome Guest 

Show/Hide Header

Welcome Guest, posting in this forum requires registration.





Pages: 1 [2]
Author Topic: Sunset SP Mogul
Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: August 27, 2018,
Quote

Tom,
I also find the small metal bristle brushes handy for digging out the small paint flakes stuck in crevices.

Charlie

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: August 31, 2018,
Quote

The cab is finished till painting time. Windows are moved to the rear and new grab irons installed. Also added roof seam, drip strips, and the turret shut off valve. New awnings were necessary and that took a couple tries.

The new castings to use on the boiler are on order so while awaiting those, maybe check the frame/pilot assembly to see what extra detailing I might want to add.

Charlie

Image

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: September 2, 2018,
Quote

New working knuckle coupler and air lines added to the pilot assembly. The pilot is a separate sub-assembly attached to the frame with a screw. This made it easy to fit and solder on the two air line pipes. Road engines generally have two pipes and hoses located on the pilot deck (brake line and the signal line).

The valve manifold situated above the left hand cylinder was standard for SP steam locomotives. The pipe on the left goes into the smoke box and soldered there. The pipe on the right goes along under the boiler running board behind the air tank and pump to the cab. I terminated that pipe just as it goes behind the cylinder exhaust pipe in order to be able to remove or re-attach the boiler to the mechanism.

Charlie

Image

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: September 4, 2018,
Quote

Sunset's builder was apparently somewhat confused by the purpose of the power reverse casting as he had soldered a flat bar to the P.R. to reach the corner of the firebox. The prototype photo shows a typical arrangement for the P.R. and the operation of the Stephenson valve gear through a lever arm.

The second photo shows my version attached to the frame on the Sunset mogul. The top of the lever arm slides just past the end of the actuator arm, but is not attached to allow removal of the upper structure. The screws holding the crosshead guides provided a convenient attachment method without attempting to solder to the heavy milled brass frame.

Charlie

Image
Image

John-
Wubbel

Posts: 133
Post Re: Sunset SP Mogul
on: September 4, 2018,
Quote

Charlie, it is nice you can explain the mechanicals on these engines because the younger modelers at first glance look at these steamers and they are not sure what they are looking at or its purpose toward facilitating a working locomotive. These side by side comparisons enlighten me as well.
John

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: September 4, 2018,
Quote

John,
I'm happy to answer questions if I can. For any that may be unfamiliar with the what and how of a Stephenson valve gear since it is hidden inside the locomotive frame, the Google has some excellent drawings and videos to show all about it. Basically, the reverse lever pictured is moved forward or backward from top (neutral) to change the timing between the rod moving the cylinder steam valves and the piston driving the main rod to make the locomotive go forwards or backwards.

Charlie

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: September 14, 2018,
Quote

Not a great deal of progress on this project over the last week. I'm waiting for the new injector castings to arrive so work has been confined to such items as the brake air piping that is out of the way of the injector installation or can be made removable. The Sunset's brake air pipes that were terminated at the underside of the running board were replaced with completed runs of the pipe as shown in the attached photo. Also the distributing valve was moved off the cab floor and soldered to a support on the removable blow-down muffler attachment plate. A simplified version of the piping nightmare between the dist. valve and the engineer's brake control stand seen here is my limit for this day.

Charlie
Image

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: September 20, 2018,
Quote

It seems I spoke (wrote) to soon about the cab being finished. In checking the fit between cab and tender with a new drawbar, I found the cab roof overhang is an 1/8" (actual) too long. The part to be removed lines up with the notches at the corners.

The key here is that the oil tank dip stick has to be outside the edge of the roof when the space between the back of the cab and the front of the tender is about the proper scale distance. I know we modelers stretch that dimension some so our models will navigate our curves, but I think I can get a little closer than what's shown in the photo with this mogul on 60" radius curves.

Charlie

Image

Harry

Posts: 171
Post Re: Sunset SP Mogul
on: September 20, 2018,
Quote

Charlie.
Thanks for posting the photos and the descriptions I don't build Steam locos but I learn a lot from blokes like you on your workshop practices.
I'm 75 years old and still very active with my own modelling and in the workshop your never to old to learn something if you want to.
I've learnt over the years not to get to set in your ways try other peoples
techniques.
Thanks for sharing your modelling mate.
Nev.

Nev

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: September 20, 2018,
Quote

Thanks Nev. I really like the structures you build to show the purpose for what's going on.

I've got five years on you and this sort of model bashing has been my favorite part of this hobby closely followed by freight car operations and the switching involved. When this mogul gets finished, I intend to use it to handle one of the locals and as a backup to the 0-6-0 yard goat.

Charlie

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: September 25, 2018,
Quote

The injectors and blow down valves plus the associated piping have been installed. Now working on the air lines for the braking system on the engineer's side. I find the bending, fitting, and researching all the assorted brass rod and fittings on a steam locomotive some of the more fun (or frustrating! ) parts of this hobby. But, YMMV!

Charlie

Image

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: September 30, 2018,
Quote

Some additional engineer's side piping has been installed including the control line to the power reverse.

As it came from the factory, this model did not have the bottom half of the tail beam on the frame. Hence, aside from the appearance, there was no place to attach the buffer plate that goes between the locomotive and the tender buffer. As it happens, there is a convenient hole provided in the frame that can be tapped for a 4-40 screw to bolt on a sub-assembly to represent that part of the frame complete with the cab buffer plate (a PSC casting in this case).

The much closer coupling of the tender to the locomotive now will require a new hinged deck plate, which will be next on the agenda.

Charlie

Image

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: October 18, 2018,
Quote

Limited hobby time the last couple weeks has slowed progress, but the loco is now ready to have new decals applied to the cab. I wanted to match the base Sunset paint on the additions and alterations so Scalecoat gloss black was used and should also give a good surface for the decals. Unfortunately, this color paint really hides details, especially in photographs. Some dry brush work and light "weathering" overspray with the air brush will help bring the detail out.

Charlie

Image

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: December 9, 2018,
Quote

It has been awhile since I posted any updates on this project, but the last month has been hectic.

The new tender was finished and new cab lettering applied. About the only remaining visible item that I intend to do at this time is the engine crew. The rest is all internal electronics --- decoder, speaker, and lights. But, for now, it will run on DC.

Charlie
Image

John

Posts: 28
Post Re: Sunset SP Mogul
on: December 10, 2018,
Quote

#1813 looks fantastic Charlie, great job!

John

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: December 10, 2018,
Quote

Thanks John. It was a fun job and it gave me a place to use that PSC tender kit left over from another loco project. Of course, that means I still have a left over tender -----

Charlie

Tom-
Dempsey

Posts: 104
Post Re: Sunset SP Mogul
on: December 11, 2018,
Quote

Time to build another locomotive.

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: December 11, 2018,
Quote

Quote from Tom Dempsey on December 11, 2018,
Time to build another locomotive.

A tempting thought, but this layout is maxed out on locomotives at the moment. And there are a couple in storage awaiting either a decoder or fixing a mechanical problem. Maybe a passenger car this time.

Charlie

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: February 8, 2019,
Quote

No passenger car project yet, but I did decide to order the DCC parts and complete this mogul. Unlike a lot of small steamer models, this model has a lot of space in the smokebox and also between the boiler weight and boiler i.d. It looked like enough room for the decoder, speaker, and wiring thereby saving a couple engine/tender plugs. However, trying to squeeze the current keeper and everything else in there made the tender install option a no-brainer. Plus the large amount of free space in this whaleback tender and the nice big opening under the tender deck visible in the first photo makes it easy to have extra length to the plug wires for easier connecting that could be shoved back into the tender shell.

Charlie
Image
Image

Charlie

Posts: 247
Post Re: Sunset SP Mogul
on: February 9, 2019,
Quote

I found this 28mm square enclosed box speaker by Railmaster Hobbies to be a perfect fit inside the smokebox. There is still space between the back of the speaker box and the boiler weight for storing the four LED and resistor wiring connections for the class and train indicator lights. The headlight LED and resistor have a Miniatronics connector to allow complete removal of the smokebox front.

While doing the CV programming on main, a very momentary mystery short showed up that wasn't there or noticeable when running on straight DC. Finally had to run the loco in the dark around the layout to spot its location ---- the pilot wheel's flange could occasionally twist and bounce to contact a cylinder bolt head. The cause was the extra large axle slot in the pilot frame allowed the wheels to twist and move back and forth. Probably the pilot wheels used for the 3 rail version of this model have a larger diameter axle. Closing up the gap to keep the axle and wheels in the forward position and straight solved the problem.

Charlie
Image
Image

Pages: 1 [2]