To paraphrase Vane Jones, "Knowledge is of little value until shared with others."

Thursday, August 22, 2013

AEFRE 49 - #6C Detailing the Model.

Next to a headlight bracket, on one end of the cab, is 49's unique 3-chime whistle. It has 3 "pipes" attached to the base pipe to give the 3 chimes .
Part of a Joseph Hazinski photo. The entire photo will be posted as work on the 49 is being finish.

From the photo, the size of each whistle can be determined. The following is my engineering drawing for the whistle.

To solder the 3 pieces of brass rod to the base pipe, a form was made by gluing 3 small pieces of strip wood to a wooden base. The pieces of brass rod were soldered using 6% silver solder.

When the solder cools, remove the brass from the wooden form and clean with a file. The individual whistles may need to be straightened. Be careful so the bending does not dislodge the brass rod at the soldering point. 

When you are satisfied with your work, cut the 3 pieces of brass rod on an angle. File the top of each pipe flat. The pipe to which the whistles are soldered can be bent back as to into the cab.

My 3-chime whistle needs some final filing and additional cleaning.

Place your 3-chime whistle aside. it will be mounted later.

The one piece end beam platform step is next. My engineering drawing included the brackets to be bent to hold the pieces of wood (styrene) to the end beam. All 4 brackets are bent to the same design.

After the 4 brass brackets were bent to shape and size, the 4 foot boards were cut from styrene. The foot boards can be prepared like the decking with scribing. The foot boards are lightly rounded at the corners.Two of the foot boards will be mounted (ACC'ed) horizontally and the remained 2 boards mounted (ACC'ed) vertically.

Styrene strips ACC'ed to narrow pieces of brass have a tendency to come loose. The floor boards on the model will be subjected to abuse in handling. Small #8 straight pins were installed through the brass and styrene strips. 

Always drill larger holes than the diameter the straight pins when using ACC. This allows the ACC to "fill" the area between the pin and the material into which the pin is inserted. The area in the larger hole increases the ACC's ability of to move in between the styrene and pin to give a better grip. 

The straight pins were cut and filed smooth after the ACC cured.
The foot boards mounted to the end beam.

Straight pins were used to attach the foot board brackets to the end beam. Be careful not to drill through the decking.

From here on, until the trucks are installed on the model, when the model is placed upright; the model MUST be placed on something higher than the foot boards hang down. Placing weight on the model without supporting the foot board brackets can be disastrous.

The finishing phase is about to start. Inspect the model for any problem, material hanging loose, loose styrene, erroneous fingerprints, etc. Make any repairs now. Once the finishing phase starts, you'll be more interested in finishing the model than fixing problems.


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