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Building Tips and technical articles. => Building techniques => Topic started by: Phil Goldberg on March 05, 2017, 06:33:35 PM

Title: Tom Morris Bell Crank Set Up
Post by: Phil Goldberg on March 05, 2017, 06:33:35 PM

I recently purchased a Tom Morris 3/16" x 4" Bell-crank.  It came with a post, materials for wrapping ends etc.  In the kit there is some silicone tubing and two wheel collars  with set screws.  Can anyone describe the set up for these bell-cranks?  Am I to assume that the collects are for either side of the bell-crank to keep it centered.  Also do I just trim the shaft and epoxy it into place in the bell-crank supports?   Thanks, Phil  

Title: Re: Tom Morris Bell Crank Set Up
Post by: Paul Smith on March 05, 2017, 08:32:32 PM

I've bought some Morris stuff.  
He gives you a variety of options to fit your project.  
I don't ever use the wheel collars, but rather box the bellcrank into the structure.

Title: Re: Tom Morris Bell Crank Set Up
Post by: Shug Emery on March 05, 2017, 09:37:40 PM

This may help...
Shug

https://youtu.be/Vo6rVtyv78I (https://youtu.be/Vo6rVtyv78I)

Title: Re: Tom Morris Bell Crank Set Up
Post by: john e. holliday on March 06, 2017, 09:19:14 AM

Set up the lap top so I could hear what's being said.   He didn't say anything about grinding a small notch in the wire to set the screws into when you tighten them.  I some times have to add a washer or two to take up any slack between the bell crank and the wheel collars.  I also ditch the tubing and add washers to center the bell crank.  Also after it is installed I put something top and bottom over the ends of the 1/8 inch rod so it can't move vertically.  Lost a good plane as the post slipped out of the ply piece.  Hope this helps. H^^

Title: Re: Tom Morris Bell Crank Set Up
Post by: Phil Goldberg on March 06, 2017, 09:54:34 AM

Thanks much for all the help.  Perfectly clear now.  Phil

Title: Re: Tom Morris Bell Crank Set Up
Post by: Motorman on March 06, 2017, 09:01:57 PM

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Title: Re: Tom Morris Bell Crank Set Up
Post by: Dave Evar on March 08, 2017, 04:57:03 PM

Here a couple of pix of my installation in a Brodak Cardinal profile wing.
Top and bottom views.  The 1/6" ply, top and bottom, to position
the 1/8" bellcrank pivot during installationon the ribs before the balsa sheeting,
notched into the two center 1/4" ribs.  (full body fuse)  After sheeting the wing
I put another 1/8" piece on top and bottom after putting the wing in the plane.

Hopefully this helps.
 
          Dave