Erie Caboose Radio Antenna

Re: Erie Caboose Radio Antenna

Postby Bernd » Fri Sep 08, 2017 1:59 pm

Had a bit of a set back with the jig. When I went to center punch the jig I inadvertently missed getting it dead center where the spokes meet in the middle. What to do? Re-scribe the jig that's what. In case you'd like to see how I made the holding jig I did a little video. It's speeded up to 4 times of actual speed.



It'll get done one of these days. :grin:

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Re: Erie Caboose Radio Antenna

Postby Bernd » Tue Sep 12, 2017 5:58 pm

More progress on the jig. I finally was brave enough to drill a .0225" hole through the 1/4" thick aluminum jig. It was done manually with an Archimedes Drill. What is that? Here's a picture of one.

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So here's the hole in the jig, plus a penny for size comparison.

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And if you don't believe me here's the drill sticking through the jig. It took about 10 minutes to drill through and I only used one drill. 8-)

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Next up is making the tiny clamps to hold the wire down for soldering.

Not to worry Al. I'll get'er done soon. :wink:

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Re: Erie Caboose Radio Antenna

Postby areibel » Wed Sep 13, 2017 10:49 am

Don't get in a big hurry Bernd, that would mean I'd have to finish the model too!
Actually I have it about 90%, it would have been more like 95 except I managed to get a big glob of solder into the nut that mounts the trucks. And it's soldered inside the bolster etch, so I had to do some "non destructive disassembly"!
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Re: Erie Caboose Radio Antenna

Postby Bernd » Thu Sep 14, 2017 11:33 am

Not hurrying Al. :smile:

Since we are supposed to get rain today I decided to retreat to the shop and work on the antenna jig. I came up with small clamps to hold down the wire. Using .010" (.25mm) piano wire I made three tiny clamps to hold down the circle of phosphor bronze wire.

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Next I cut six pieces of wire to a length of .140" (3.556mm) long for the spokes. Flux was smeared on were the wires will be soldered to and tiny slivers of solder were added.

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Here comes the fun part. Soldering all those parts together. Easy to do. I set the jig on a bigger piece of aluminum and then that was set on a gas stove burner. At the highest setting it only took a few minutes to heat both plates to melt the solder.

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A quick run under some cold water and this is the end result. Not 100% but it proves out the jig works.

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I can think of one reason not all six spokes soldered, the wire wasn't clean enough. Also when I drilled the .0225" (.5715mm) hole through the center it didn't drill straight though. The slanted hole has nothing to do with the soldering job. Now that I have prove of concept I'm going to make another jig, hopefully with a straight hole through the center.

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Re: Erie Caboose Radio Antenna

Postby Bernd » Thu Sep 14, 2017 2:31 pm

Well here you go. Third try was the lucky charm.

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I cleaned the phosphor bronze wire using a piece of emery paper. Proof positive that clean parts solder much better and neater.

Now on to making the "perfect jig" with a straight hole through the center. WHY? Here's why.

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