Graver Power Hone

A power hone for sharpening engravers GRS style. This is from Shaun Hughes idea of using a slow geared DC motor https://www.youtube.com/watch?v=3OgticTTDQQ

I had some 6" diamond discs already e.g.
https://www.amazon.co.uk/Sourcingmap-Diamond-Grinding-Sanding-Polishing/dp/B072C2L8K9/
Ean 0601382730273

4" might be more practical.

I used a 24VDC 480 RPM geared Motor from ebay:
https://www.ebay.co.uk/itm/DC-Gear-Motor-12V-24V-High-Torque-8-470Rpm-With-Electric-Gearbox-Reducer-for-DIY/402543051076

A cheap 9-24V power adaptror:
https://www.ebay.co.uk/itm/AC-DC-3-12V-9-24V-Electrical-Power-Supply-Adapter-Charger-Variable-Voltage-UK/363109269512?var=632247701005

And some bits for a thrust bearing to stop any platter wobble:
8mm Collars: https://www.amazon.co.uk/gp/product/B08BLLHLBZ
8mm rod (but you only need 50 mm): https://www.amazon.co.uk/gp/product/B07T5SYYTZ
A couple of skateboard bearings: https://www.amazon.co.uk/gp/product/B00WXDAUQG
(I had all these left o