Wednesday, December 28, 2011

Pedestal Binder Build and Fit Check

    The pedestal binder is a bolted on part that closes the bearing slot and strengthens the frame.  It has two pockets that closely match short posts on the bottom of the frame close to the bearing slots.  The sides of the bearing slots are called pedestals.  The binder acts to close the frame across the bottom of the bearings giving considerable added strength to the frame.  It also doubles as a keeper for the bearings.
     The original PLA pedestal binder is shown at right in the photo above.  A pair of new black ABS pedestals for the Front, Intermediate or Back drivers are at center still on the raft and support green ABS.
    The pedestal binders have been removed from the green support ABS.  The bottoms still have residue support material which will be removed with the Dremel sanding wheel.
     The finished pedestal binders are shown near the frame ready for installation.  Both the frame and pedestal binders included pilot holes to be used in guiding the drill and tap steps to be done later.
   
    The binders have been placed in position ready for drilling.  The first step will be to drill through both the binder and bottom horizontal member of the frame with a pilot drill for a 2-26 tap.  After that the binders will be removed and the frame tapped.  The binders will be drilled with a clearance hole for the 2-56 screw using the tapping pilot hole as a guide.  Then the binders can be attached using 2-56 screws.  The binders can then be removed to permit wheel set removal during the balance of model building as needed.

    The photo above shows the binders in position with the wheel set in place.  The wheel set still has slack to move up and down for spring and equalization operation.  None of the parts built for the frame have paint touch-up.  That step will be done once all fit checking is complete, probably after build and attachment of the Back Driver Section and installation of the Back driver set.  Painting of the frame will not take place until all six portions of the frame are attached.

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