MCW Oct '10 Demo
Oct 28, 2010Public
Photo: Program Chair Gary Guenther introduces demonstrator Jim Duxbury as Eliot Feldman and Rita Duxbury look on.
Photo: Jim Duxbury is an expert kaleidoscope maker. Here he is with one of his fancy versions with an elaborate mounting.
Photo: Rita Duxbury, Jim's wife, assisted him during his kaleidoscope demonstration.
Photo: Here's a simpler version that Jim will demonstrate for us now.
Photo: The "barrel" of the kaleidoscope is made from three laminated boards glued together in a triangular form.
Photo: The boards must be cut to extremely precise angles in order to avoid a gap. This electronic angle gauge is a big help when used on the table saw.
Photo: This rough shape is then turned round, as indicated by this sample of a partly turned barrel.
Photo: Here is another raw glue-up for a barrel.
Photo: Jim sells detailed plans if you would like to make one. There are a lot of small, important details, so these plans are a big help.
Photo: Jim is turning the barrel left handed here for comfort.
Photo: One of Jim's inventions is the Resp-O-Rator. It works like a SCUBA mouthpiece and sucks air through twin filters at the rear. It fits comfortably under a face shield and does not fog it up. Jim sells these on his web site.
Photo: Jim uses a belt sander at the lathe to make quick work of it -- this is a potential safety hazard -- be very careful if you try this at home.
Photo: One of Jim's "tricks" for working on the lathe with hollow objects is to use cone-shaped jam chucks in both ends. This can be done with many centerless objects.
Photo: Here Jim is turning the outside of the "objective" from a square lamination.
Photo: Then the inside of the objective is turned to fit the outside of the barrel.
Photo: A little measuring is in order...
Photo: ...and a little more sizing.
Photo: The barrel now fits snugly into the objective.
Photo: This cutaway model shows the inside details that need to be turned into the objective to hold the optical elements and fit it to the barrel.
Photo: Jim has made a special tool to cut the necessary rebates into the objective.
Photo: Switching ends now and drilling the eyepiece.
Photo: Measuring the barrel diameter for sizing the eyepiece.
Photo: Turning the outside of the mounted eyepiece.
Photo: The eyepiece is turned.