| East PAC |
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| Below are thumbnails of the typical operation involved with making a master pattern on the lathe. Click on the photo to see an enlarged photo. |
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| All Copyrights Reserved. 2001 |
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| The idle hub master was machined from steel. I chose to use two pieces for the complete master pattern. The reason for this was because I didn't have a piece of steel big enough in the shop to make the complete unit. The first two pictures gives you an idea how each piece of the idle hub was cut. The first picture shows the round stock being cut off in the metal cutting bandsaw. The flat piece in the second picture is the back half of the hub. The center hole is drilled and the 4 corners will be cut off in the bandsaw thus keeping the hard knocking to the lathe bit to a minimum. The next two pictures shows hub having the outside being turned down, the last shows a facing cut being made. |
| The next series of pictures are that of the front hub having the taper machined. I might add that the piece is being machined using a lathe dog and mandrel setup. This assures a properly centered hole in the piece. The final pieces are cut approx. 6% larger to allow for shinkage during the casting process. We also allow a few thousands more for surface cleanup on the lathe for the cast piece. These two pieces will be attached together before making a mold. The last picture gives you an idea of just how big this piece is. The master, by the way, weighs 6 pounds. The aluminum casting will be a lot lighter in weight. (We hope!) |