Now that the turntable base has been cast, it's time to machine the features to make it functional. I started by setting it up on the milling machine upside down with spacer blocks underneath, and clamping through the middle. In this setup I faced the bottom contour.
Here is a closeup of the finish, now the base will sit flat for the next setups.
I mention in the platter segment that I revised the spindle design to use bigger bearings. This meant the original bearing boss casted directly into the base wouldn't be large enough. Therefore, I had to make a bigger one and attach it into the platter support platform. Here I've started the first side in the lathe.
Then machining the other side. I didn't have two identical bearings, so the bores were different sizes.
Next, to mount it in the base, I began machining a hole where the original boss was. I started by plunge cutting a rough circular shape.
Then I used my big Criterion boring head to machine it smooth.
To mount it, I drilled and tapped three 5/16" holes. I also faced the area around the bore so the new bearing boss would sit flat
The new boss mounted.
Lastly I faced, drilled, and tapped a 1"-20 hole for the tonearm bushing.
Next Step - Casting The Platter
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