[GreenKeys] [External] Re: empty papertape reels (for 8-bit tapes)

[Jones, Douglas W]

From: Dave Wade [dave.g4ugm at gmail.com] -- Tuesday, August 4, 2020 3:57 PM
> Probably need to print them in three pieces, so 2 flanges and a hub.

The reels I just sent to John at tubetestingpros.com a few weeks back were two-piece reels.  I just found I have two more in my pile.  I've attached photos (including metric and English rulers in the view).  These aren't fashion photos, but they should suffice as good starting points if someone wants to 3d print some reels.  Notice the fairly large round central hole.  This is intended for a light friction fit on the tape winder shaft, so that the shaft can spin continuously at a speed faster than the reel, with friction determining the tension on the tape.  The friction was determined by a knurled screw on the end of the shaft that drives a taper into the end of the shaft, causing it to flare out.

One half reel has dimples on the end of its three legs that fit sprung bumps on the other to lock the rotation.  The other half reel has notched ends on its legs that fit holes on the other half.  Press the legs into the holes and then twist to lock the two halves together.  It clicks locked, and unlocks with a click when you twist the other way.

Someone should really make plans for 3D printing something like these, since they do get lost and break.  I guess they are PVC, and I suspect simple breaks can be repaired with a solvent-based cement, just like you can glue Teletype model 33 cases with solvent cement.

         Doug Jones
         jones at cs.uiowa.edu
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