Improved cab design

A couple of weeks ago, The Boy and I were lucky to be invited to visit Dan Gelbart’s amazing lab. The Boy was so inspired, we’ve been working our way through Dan’s YouTube channel.  There, Dan stresses the benefits of keyholes to facilitate removal of parts. As he says, they’re free with a water jet cutter, and they really help to keep from losing screws inside the machine.

Well, they’re free with photo etching as well, and they solve a challenge that I didn’t know I had with the cabs of my little engines. On #10, the cab roof is removable and the cab screws into four nuts soldered to the house brackets. The 0-80 screws are only about a millimeter long, and are extremely difficult to maneuver into their holes deep inside the cab, beneath the throttle.

By making key holes in the seats of #622’s cab, I can leave those screws in place and simply slide the cab over them.  The sliding action will also help with aligning all the pipes and rods that pass through the front of the cab.

The core for this cab is going to fold up out of brass sheet, with brass side veneers providing the relief.  This, along with a partial roof folded off the cab sides should help to strengthen the very fragile cab roof extension (where it covers the fall plate).  The front and rear veneers will be .010″ plastic so I can isolate the two sides of the cab.

As with #10, I will keep all the window frames separate until they have been painted so that I can paint them a contrasting colour.

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