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Practicing On The Lathe

25/7/2015

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It has been a while since I do any serious work on the lathe. After fixing up the scale, the carriage was reinstalled and I took some time to take out some slack in the hand wheels and the screws. Turning is a little tighter now but still rather smooth. To get a proper feel, I chuck up a small piece of aluminum and did some test.

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The target diameter is 19mm, which is the size given to me for the slot car roller.
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Putting the roller on the workpiece for comparison.
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Just when I started parting off, I realized that I forgot about the 5mm hole... Was too eager to try out using the DRO. Not too late to do the drilling though.
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Parted off at 2.36mm. I've to devise a way to hold the cut off piece to face the other side.
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The wheel blank half done.
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The piece given to me as sample measured 18.919mm. I believe the seller meant it to be 19mm (per their website) but this is not a part that requires tight tolerance.
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Love to see this: I'm within 0.01mm!

Come to think about it, if I'm to make the wheels from scratch, I don't really need to face off the part off side of the wheel.  Reason being, most of its face would be recessed and spokes milled out.

I'll make a wheel fixture to hold the wheel on the Sherline/A2Z CNC Mill.  The fixture will be held in the vise.  This is what I've in mind:

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The diameter of the cylinder will be 20mm. The little protrusion on the top face will be 5mm, matching the ID of the wheel blank. It will have a height of 2mm, slightly shorter than the thickness of the blank to hold down the blank. The centre hole will be tapped M3.
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Cross section view of the fixture.

Do let me know if you have any suggestion or spotted mistakes.  I'm still very much a newbie though I've had my machines for 4 to 5 years.

Until next time... be greatly blessed!

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