DIY Instek GSO-810 Replacement Handle

[cliffyk]

AS has happened with many of the older Instek instruments from the mid-late 90s (spectrum analyzers, oscilloscopes and other) that shared the same cabinet configuration, the plastic handle on my GSP_810 failed when it became brittle and the locating pins on the hubs sheared, and the hubs themselves cracked and fell apart.

However t'other day it occurred to me that I could use FreeCAD to design new hubs in such a manner that a length of aluminum flat stock could be fastened to a couple of the same to make a new handle. I got the design finished yesterday and 3D printed a prototype for final fitting last night. After a few tweaks of the design I have produced two hubs (see below for a couple "screen grabs" from FreeCAD:

(inner side showing the central post and 12 locating pins)


(outer side showing the slot for mounting the handle to fabricated of ¾ x ⅛ aluminum flat stock to be fastened with small sheet metal screws)


I plan to reinforce the long span of the flat stock handle by laminating a couple of ¾ x ⅜ oak "pads" to it.

I will update this post when it is done.

If anyone wants either the FreeCAD design or .stl model files give me a yell and i will post links to same.

Here is a screen shot of a pair of the hubs, with supports, and ready for slicing created using the Chitubox 3D model manipulation and  "slicing" application:


I use an Elegoo Mars (upgraded to a Mars Pro) printer, and a 50/50 mix of Weistek Tenacious resin (clear) and their Standard resin (gray) to obtain the desired detail and mechanical characteristics. The Tenacious has an elongation-at-break of 50% or better, the Standard EoB is 11-20%. Both are are the best I have found and reasonably priced too.

Here's a photo of the two hubs printed, fully cured, and cleaned up (I am going to paint them in ivory to match the cabinet):