Friday, December 22, 2006

Minor update

  I am doing some prep stuff for the gears.  Yesterday I purchased a high quality divider.  This will be used to mark the teeth for the gears.  When dividing the gears up, I will not be dividing by the number of teeth but a larger number.  For example, the main wheel on the going train will have 96 teeth.  I will first divide the wheel into 4 parts of 24 teeth.  Next, those 24 teeth might be broken up into 6 parts.  Then finally into the final four teeth.  This is just easier to lay out then trying to find the exact measurement for the divider that will handle 96 teeth.

  Next I finished cutting off a big hunk of S7 steel.  This will be used to make a top swage to form 1/2" diameter round.  The 1/2" will be the size of the arbor where it goes into the frame.  Most of the arbor will be 1" round stock.  This part of the arbor will hold the winding barrel.  The barrel is nothing more than a round cylinder of wood with a 1" hole in the center.  Other parts of the arbor will be square and this is where the gears will go.  And finally, as mentioned above, the ends of the arbor will be 1/2" round.  That is what I need the swage for.

  Finally, I made my gear layout table.  To call it a table is a bit misleading.  It is nothing more than a thin sheet of 24" x 24" steel glued to a a sheet of 24" x 24" plywood.  In the center is a small pin.  I use the pin to draw two concentric circles.  One circle is the inner diameter of the gear while the other circle is the outer diameter.  As I bend the gear, I will use these circles to ensure my gear is staying true.

  I had hoped to get more done today but it was rainy so I was not able to start until late afternoon.

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