Re: Linkage repair on a brass locomotive
Ralph W. Brown
Years ago, well decades really, I had zero problems using the tool provided with the Penn Line kit I was building at the time. Some time later I had a much beefier tool custom machined for me and it also worked without difficulty. Bowser presently offers a riveting tool for the valve gear rivets (Part No. 1-36), which I suspect is very like, if not the same as, the Penn Line tool.
Incidentally, I didn’t use the paper-between-the-parts trick mentioned previously, but it seems to me the instructions (yes, I read instructions) said something about not getting too aggressive with the hammer, or words to that affect. Still, if one’s “hammer” lacks finesse, the paper sounds like a good idea.
PRRT&HS No. 3966
NMRA No. L2532
From: Bryian Sones via Groups.Io
Sent: Wednesday, January 30, 2019 10:28 PM
Subject: Re: [RealSTMFC] Linkage repair on a brass locomotive
With all that said. I assume there might be better tools available than others. Do you have any suggestion on where to get the best tool for this and which to buy?
Also, thank you to everyone for the input. There are really good suggestions and advice.
Union Pacific Prototype Modeler
On Wednesday, January 30, 2019 12:03 PM, Daniel A. Mitchell <danmitch@...> wrote:
When setting such a rivet one wants to roll the hollow end over into a bead rather like a doubled-over sock. You do not want to just squash it flat. Flattening it may work, but will usually crack the rivet’s new head, and weaken the rivet. This is why rivet-set tools are made.
They form the new head with a smooth sort-of “rolling-over” action (no true rotary motion is involved). Lacking a rivet-set of the correct size, a reasonable alternative is to carefully expand the rivet just a bit with a countersink or other pointed / tapered tool, then work the edge outward and down with a small jeweler’s ball-peen hammer. It’s not as good as using a proper rivet-set, but can be quite satisfactory.
As an aside, this is the same idea as rolling in boiler tubes in a tube-sheet. Here the much larger tubes ARE actually rolled into form with a rotary-roller tool driven by a large air or electric drill. As the tool rotates inside the hollow tube it forces the metal outward then bends and stretches it back over itself forming a bead.
Such a tool would be great for hollow rivets too, but for HO valve gear the parts would be microscopic!