Large Scale Central

Help needed: Brass rod forming

Between a rescued dog situation gone wrong, disasters at work, and a wife sick with pneumonia for well over a month, I haven’t had much time since Christmas to do anything on my 50 tonner project. But, over the last week I’ve managed to get back into the shop, blow the dust off, and start gluing my fingers together again.

One new challenge is fabricating new cut levers for the locomotive. The as-supplied factory ones are made of wire that’s way too thin, and consists of a single piece with a square bend in the middle. What I want is to make new ones out of some brass rod, and in three pieces like the prototype.

The difficulty is twofold … first, the two outside pieces require 90 degree bends … three of them … in three dimensions. (and a third small bend at the end of the handle) Bending by hand, that’s tough to get once … and I need enough for both ends of at least five locomotives … probably more.

I spent two hours yesterday making ONE … and then had to scrap it as it wasn’t right, and I’d forgot to put the supports on anyway, before I bent it!

I approached Phil (who makes something similar for his freight cars) but he wasn’t interested … he did supply me with some great white metal supports though, along with some nbw’s and some grabirons I can use elsewhere on the project.

Anybody have the technology to make a jig for this, or … have some kind of idea of how to do this except by hand bending (and pulling out hair?) I really need to make some progress on this engine (I’m simultaneously working on wheelbearing covers, window supports, cab interior, details, and trying to work out the handrails…so I’m making SOME progress…) so that I can go back to Alan with something to show him … I’m almost embarassed to call him after being off the project for nearly six months!

Matthew (OV)

Quote:
Anybody have the technology to make a jig for this
Mathew,

I think Bruce had a neat jig made from acrylic to bend his steps. Ask him if it will work for your cut levers!

You can make a nice jig out of acrylic, as it is fairly hard and will withstand pressure from bending and pliers.

Do you have a picture of what you’re trying to do?

Why does it have to be in three pieces?

Is this to be a functioning cut lever?

Bruce … Not so much functioning … but all of the essential elements.

(http://freightsheds.largescalecentral.com/users/slatecreek/_forumfiles/cut.JPG)

Left and right levers lift the vaguely U shaped thing in the middle that lifts the pin … mostly makes it so the opposite side lever doesn’t lift up as well. I don’t expect mine to be useable, just look better than a single piece of rod bent to have the “U” in the middle like the factory one does. It’s possible I may have to just get over it … but even then, the only real difference between the two is for the 3 piece, you cut the U bend in half for the left and right levers, and make a seperate U piece … so you still have all of the other bends to make. I made it for the 7145, and it looks … ok. All the pieces are there. I’m just going to have to make 5 or 6 sets for this project, and man … that’s a bit daunting, as it’s hard to get acceptably right once! Here is a VERY rough sketch of what I mean. The circles are attachment points, a la the nice purpose designed castings I now have …

(http://freightsheds.largescalecentral.com/users/slatecreek/_forumfiles/rough.jpg)

Matthew (OV) (helps if I paste in the picture link!) Additionally, I wouldn’t be opposed to making the “handle” ends more L shaped instead of C shaped, thereby eliminating two 90 degree bends at the top of the “handle” …

Matthew (OV) That is pretty straight forward. I’d make a jig from acrylic or brass and it would look something like this:

(http://freightsheds.largescalecentral.com/users/thejoat/Misc/Jig.jpg)

The jig would be sized to meet your own dimensions. Now, to bend your wire, I’d first start with the C shape. Bend it from the A side, to the B side and back to the A side. Now, you need to bend the long portion. I’d have a notch cut on the end (that dark line on my diagram, as well as another notch on the “D” end. Line it up in the notch and make your bend along the “C” side and back on the "D"side. Turn it over and align the wire on the "D"side and make your final bend. To make the other side, just turn the jig around and make the bends the other way. For the middle part, I’d modify the jig a bit. I’d drill a hole as deep as you want the short leg to be. Put the wire in and make the bend. Make the U by bending it around the "D"side - well, assuming that “D” is the right length.

That makes it look so easy! Certainly better than what I’m doing now!

Matthew (OV) said:
That makes it look so easy! Certainly better than what I'm doing now!
Great! Next we need pictures!

Bob got me started on jigs when we were building the EBT boxcars. It’s amazing how easy they are to make and use.

Well, it doesn’t show much of the last couple days of work; a lot of it has been putting itty bitty bolt castings on the bearing covers, making cut levers that I had to scrap, and removing the window track (without breaking the cab) so that I can make one that lets me get the windows in and out for painting… but it’s moving forward again. Matthew (OV)

(http://freightsheds.largescalecentral.com/users/slatecreek/_forumfiles/hornson2.jpg)

(http://freightsheds.largescalecentral.com/users/slatecreek/_forumfiles/fronttruck.jpg)

I need to make some strong attachment points to hold the hood and cab to the deck … finish the trucks, finish the window tracks, and redo the control stand and seat in the cab. I also have to form all the brass railings … and for that I am making a jig (but I have to actually get one made that works…)

From there, I make a few changes to the parts sheet, and the rest of the series gets cut, assuming Alan hasn’t forgotten my name! It’s been a bad six months…

Matthew (OV)

It looks .

And nice… :wink:

Actually it’s not tooo bad, sizewise. It’s built on the 45 tonner chassis, and actually has a lower clearance… even with the proper size Prime/Leslie horns on there… and it’s actually narrowed a bit from the 45. Of course the whole thing with this project isn’t building this one … lots of folks have done that … it’s building all five of them (or now maybe six or seven…) the same, so they can be run in pairs or triples (The SCRY will have three of the first batch.)

Hehe…but at 2,592px × 1,944px, the pictures are a tad on the large size…

Oh, right, that. Someday I’ll figure that one out.

Hi Bruce

Second try

Hi Bruce

What kind of thickness works for the jig? I have some 1/8" and 1/4" Plexi I could use, I’d like to make some railings for a caboose and trolley.

Doug, Of course it depends on exactly what shape you need, as sometimes thicker pieces help you in bending the correct dimension. I’d probably stick with 1/8". Otherwise it’s too hard to get the wire out of the jig. However, for railings, you may not really need a jig. I built mine for my caboose by drilling holes in a flat bar and inserting rods and soldering them in place.

(http://jbrr.com/Pics/RollingStock/Caboose/LongCaboose/IMG_7622.JPG)

(http://jbrr.com/Pics/RollingStock/Caboose/LongCaboose/IMG_7630.JPG)

I did the same with the railing for my parlor car:

(http://www.jbrr.com/assets/images/P1050205.JPG)