REAR DOOR LATCH
A rear door on the IBM 1130, behind the disk drive, has a latch mechanism to release the door. This is used in order to swing up the top cover to access the Customer Engineer controls or to release the other rear door that exposes the logic gates.
On this machine, the handle was broken off and missing. I was able to take apart the remainder of the latch assembly and reverse engineer the mounting method for the handle.
DESIGN A REPLACEMENT USING AUTODESK FUSION 360
Armed with measurements of the mechanism and an idea of what handle shape would work, I then created a quick and dirty wood handle to test out the idea. When that proved acceptable, I opened up the CAD program Fusion 360 and designed the proper handle to be milled out of aluminum and with 4-40 threaded holes tapped in the rear.
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| Rear side of handle with tapped mounting holes |
XOMETRY.COM FOR FABRICATION
This was uploaded to two CNC services, Hubs.com and Xometry.com but with a total price just under $100 I chose the latter service. The part should arrive by the end of July, being fabricated overseas to save on the expense.
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