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January 24, 2009

The Sunflower State Crankers met in Hutchinson for their annual midwinter Model T clinic. Most of the day was devoted to pouring and boring babbit bearings. Several kinds of boring equipment were displayed. Claire Banta demonstrated pouring the bearings, then showed how to set up and use the boring machinery.

Here are steps in the process:

The first step is to pack string ito the hole under the bearing so the molten metal won't leak through it.	A mold is bolted on where the bearing will be poured.   Right: The block is heated to 400º to help the babbit metal adhere.
The babbit metal is poured into the mold.	The metal cools and sets quickly, and the mold is removed.	A metal stalagmite is left where the metal was poured into the mold.

Said stalagmite has to be cut off and filed down to allow the boring shaft to fit into the bearing.

The boring jig is placed on the block.

The boring shaft is set into the bearing and the jig is clamped in place.

For precision of placement, before the jig is clamped in place a false cam is passed through the block and it is used to position the jig.

A bearing cap is bolted on to be bored along with the bearing. In front of the cap and bearing, the cutting tooth can be seen protruding from the side of the shaft. The hole above it is where a set screw holds it in place.

The crank on the right turns the shaft to bore the bearings, and the threaded shaft on the left pulls the boring shaft forward.

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