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Re: 12" working railroad

Posted: Wed Dec 12, 2018 11:09 pm
by rkcarguy
Tonight I stayed after work and TIG welded the spring perches into the "equalizer bars". I also pressed my 1/2" stainless bolts into the holes and TIG welded 2 of the sides of the hex heads to the equalizer bars. The stainless was necessary, because it has a much higher enbrittlement temperature than steel so they won't break off. I wanted to grind the edges of the laser cut truck parts tonight and toss them in the roto-blaster tomorrow, but I have to do it outside and it's windy and pouring rain again so I'm going to have to wait.
I'm not sure if everyone understands how my locomotives trucks will function, but basically the pillow blocks(self aligning) will mount to the equalizer bar. The SS bolts act as studs which will protrude through vertical slots in the inner truck side/frame, with some bronze washers in between and the nut finger tight, so that the equalizer bars are loaded by the springs and can travel up and down in the slots.
I'll update with some more pictures shortly.

Re: 12" working railroad

Posted: Wed Dec 12, 2018 11:29 pm
by rkcarguy
Pics
S12trucks.jpg
S12trucks2.jpg

Re: 12" working railroad

Posted: Thu Jan 03, 2019 6:17 pm
by rkcarguy
Things went a little backwards today. I went to power-tap the pillow block mounting holes 3/8-24 in the "equalizer bars" shown above and hit some kind of inclusion in the plate, messed up my TICN coated HSS tap, and part of the threads in the first hole I tried. A bolt still threads in, but it's a little loose and 1/3rd of the threads are gone in the hole. I do not have room for a nut behind these, so I may have to drill and tap this one oversize and make a threaded sleeve to fix it ugh.

Re: 12" working railroad

Posted: Wed Jan 09, 2019 12:43 am
by rkcarguy
Things are starting to come together now. I welded the upper spring perches and bolsters into the inner truck sides, and bolted the cross tubes in.
Here is some pictures of how they will go together. I still need to blast the assemblies and make/buy some thin bronze thrust washers to go between the moving parts, and tap the rest of the pillow block mounting holes in the equalizer bars.
The frame pieces are also nearly complete, I have to grind the welds smooth on one of the pilots and drill/tap the coupler box mounting holes, and the frame will be ready to weld together. It's too long to fit in or roto-blaster, so I'm going to talk to a couple of paint and powder coat shops to see if someone can blast it for me reasonably.
S12truckasm1.jpg
S12truckasm2.jpg
S12truckasm3.jpg
S12truckasm4.jpg

Re: 12" working railroad

Posted: Fri Jan 11, 2019 1:49 am
by rkcarguy
Got the inner truck assemblies all roto-blasted and primed with etching primer.
S12trucksprimed.jpg

Re: 12" working railroad

Posted: Tue Jan 15, 2019 4:31 pm
by rkcarguy
I took the plunge and bought all the hardware for the locomotives trucks. This was a rather expensive venture for what it was, about $78.
32 bronze washers for the 'sliding" action of the truck suspension, normal and thin lock nuts for everything, and button head socket head screws for the pillow blocks and spring retainers all around.
Next on the to-do list is to flap wheel the bores slightly larger on all the pillow block castings so the bearings "self-align" much looser so there is no binding as the trucks conform to variances in the track, and then I can mount the equalizer bars and pillow blocks on the frames, insert the springs, and call those done until I get wheel sets.

Re: 12" working railroad

Posted: Thu Jan 17, 2019 11:36 am
by rkcarguy
I got the power tapping to work on the drill press. Apparently in the lowest speed my center pulley doesn't adjust enough and the belt slips, so I had to crank it up to the next speed. Thankfully this is 3/8-24 fine threads so it wasn't that scary. No reverse obviously so I just loosened the chuck and then removed the tap with my tap handle. Two more bars left to tap the holes on, and then I can paint these and mount them.

Re: 12" working railroad

Posted: Tue Jan 22, 2019 3:33 pm
by rkcarguy
I've been priming and assembling parts of the trucks as I have time. I'll post some updated pictures soon. I flap wheeled the bores out of the bolster pillow blocks so that they pivot more freely, and mounted them on the trucks. We also had another plate go through the laser with some remnant down one edge, so I was able to run 4 sets of rolling stock end plates(like the ones on my riding car) in this section. Moving forward I'm going to weld these up with the coupler pocket tubes and then I'll be able to simply weld these "pre-fabricated" ends onto whatever frame I want to build.
I also had a bit of a crazy idea, of using the modified 420cc engine to power a portable saw mill mounted on a 50' flat car(8'-4" in my scale), so that I could run this thing anywhere on the property that I had tracks, set it up and make lumber. It'll probably need some legs that swing out with jacks to stabilize it, but its all doable.

Re: 12" working railroad

Posted: Fri Jan 25, 2019 3:39 pm
by rkcarguy
The locomotives 7" wheel blanks got cut on the laser today. The 3/8" drive "dog" holes for my lathe arbor didn't cut very well in this 1" plate so I'll need to clean them out with a drill. The holes for the axles are right on at .990", I'm going to ream them .998" in the mill and then mount them on an arbor and turn the rest of the wheel profile.

Also have a technical issue, I've been resizing my pictures in paint so I can attach them here without any issues for the last 6 months, but the last few pictures I've tried I get an error saying "can't recognize image size" so I can't post any pictures. ???

Re: 12" working railroad

Posted: Fri Jan 25, 2019 5:11 pm
by Harold_V
I have made mention to administration the problem you've reported in posting resized pictures.

H

Re: 12" working railroad

Posted: Sat Jan 26, 2019 4:05 am
by Harold_V
You should have received an email from me, requesting a couple of the resized pictures that you are unable to post. If not, please check your junk file.
Thanks.

H

Re: 12" working railroad

Posted: Mon Jan 28, 2019 4:01 pm
by rkcarguy
I replied and sent the picture in question, thanks Harold.