Re: AC parts list
Posted by HH56 On 2015/2/25 13:16:24
Started the process of making new knobs and adapting a switch for my Clipper AC. Found a 4 position modern push/pull switch that could work the multi wire modern blower motor. Made a new longer length shaft so it could attach to the Clipper dash knob, machined a smaller retainer nut to fit in the casting and added a separate power circuit for the comp clutch. Those were fairly easy changes. Will do the same lengthening of the shaft with another switch for the heater/defroster combo. No need for another circuit there -- one terminal to the defroster and a resistor across the other two for 2 speeds on the heater.
Made a silicone mold and cast a trial knob out of plastic. It was fairly thick viscosity material but with enough sprues the thin sections didn't do as horribly as I envisioned for just being a gravity fill. Next step is redoing the plastic knob and trying for some imprinted lettering. Am thinking rubber type set into the silicone will imprint into the plastic. Haven't found a readily available rubber typeface I like yet because Packard fonts are just enough different. Probably wind up using what I have which is a tad narrower. Anyway, if that knob plan works out will make a sand mold using it for a pattern and some fine grain sand. If not, I guess it will be a smooth knob with dry transfer type lettering.
Haven't done any metal casting since the 80s and that I do not expect to go as smoothly. Fine detail and shrinkage may be an issue. Also don't have any means of forcing the metal to flow before it cools. Maybe a bit thicker sides on the knob and superheating the sand mold will give the metal time to fill before solidifying. We shall see.
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Made a silicone mold and cast a trial knob out of plastic. It was fairly thick viscosity material but with enough sprues the thin sections didn't do as horribly as I envisioned for just being a gravity fill. Next step is redoing the plastic knob and trying for some imprinted lettering. Am thinking rubber type set into the silicone will imprint into the plastic. Haven't found a readily available rubber typeface I like yet because Packard fonts are just enough different. Probably wind up using what I have which is a tad narrower. Anyway, if that knob plan works out will make a sand mold using it for a pattern and some fine grain sand. If not, I guess it will be a smooth knob with dry transfer type lettering.
Haven't done any metal casting since the 80s and that I do not expect to go as smoothly. Fine detail and shrinkage may be an issue. Also don't have any means of forcing the metal to flow before it cools. Maybe a bit thicker sides on the knob and superheating the sand mold will give the metal time to fill before solidifying. We shall see.
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