Clay, Application to Refinement

 

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 Corvette Scale Model (pt 2)

Armature build (pt 2, page 2) (pt 1) (pt 3)

In the previous page, Armature build (pt 2, page 1) I covered the process of affixing the towers to the baseboard. Now I will continue by explaining the process of positioning the baseboard on the modeling table. This process will be relatively easy because all of the main alignment work was done when securing the towers to the baseboard.

The first process is to mark onto the scale model table a centerline that travels from the front to the rear on the raised platform that will be the modeling board. This board is large enough to extend beyond the parameters of the scale model, in other words, it is bigger than the overall size of the model so that angle brackets can run along the square edges for marking out and duplication purposes.

Aligning of the towers onto the scale model table.

The image on the left shows the two towers stripped from the baseboard. The front tower has been double sided taped down onto the scale model table using the centerline of tower and the centerline of front axle to correctly position the block.

The rear tower shows the double sided tape in position before fixing to the table. As you can see the dowel holes are visible, ready to be used as guides for drilling the scale model table.

The scale model table on the right has the centerline of model marked on and the centerline of rear axle marked on.

The tower has the double sided tape positioned between the dowel holes, ready for fixing to the scale model table. On the tower there are centerlines that will correspond to the centerline of the table and the centerline of rear axle.

Once the backing of the double sided tape is removed the tower is placed into position. The next process is to drill through the dowel holes and into the modeling table to a depth of 1/2" or 12.0mm. This will provide the correct location for the scale model base.

 

Close-up of tower with double sided tape ready for fixing to the scale model table.

The towers and baseboard in position on the modeling table.

To drill the holes into the modeling base a standard electric or cordless drill will be used.

With the towers already fixed into position with double sided tape the holes can be drilled using the 7/16" spade bit or a 7/16" drill bit. The actual overall depth can be gauged by wrapping masking tape around the shank of the drill bit at a depth of 70.0mm + 17.0mm = 87.0mm. The extra 5.0mm allows for the bevel of the cutting edge of the drill. The amount of location into the modeling table needs to be 12.0mm or 1/2" to ensure a solid fixing.

With all the four dowel locations drilled, the towers can be removed and all the loose wood chips brushed out of the dowel holes. To locate the towers and the scale model board into position, four pieces of wooden dowel rod are required . The sizes will vary from front to back because of the difference in baseboard thickness. The front pair of dowels are 100.00mm or approximately 4" in length, the rear pair of dowels are 118.0mm or 4 5/8" in length. To ensure a smooth fit, the dowels need to be sanded with fine sandpaper and a bevel placed around both ends of each dowel to allow for easier location.

Locating the towers in the correct position is made easy because of the additional pencil mark indicators, this prevents reversal of the tower positions. 

Closer look at the tower and baseboard set-up with the centerline of tower lining up with the centerline of front axle.

As you can see from the photograph above and the photograph on the left, the towers are in position with the corresponding centerlines lining up with front and rear axle positions. The dowels go completely through the model baseboard and towers to locate into the modeling table, for a firm sturdy fixture.

As in all workshop procedures ensure that adequate safety precautions are used.

As the above photograph shows, the model baseboard is in position on the modeling table. The next process is to cut the Styrofoam? to the shape as shown on the master tape drawing and glue to the baseboard in preparation for building the clay model. As you can see, the tape drawing is behind the modeling table with the foam outline indicated in red.

As in any great project it's always nice to have a willing helper.

I will cover the foam buck process in Armature Build (pt 3)

Copyright © 2006 - 16 Steven Austin

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