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Thanks to all who have contributed - it's not quite the 'minefield' that I initially envisaged :D I think I've had a very productive day today - - the motor suggested by @Sideways is in Coventry (where I lived for 60+ years) some 30 minutes drive away. The lack of information was easily...

I'm still searching for answers to so many questions - - - - I've just found this - what I think may be useful - - - AC-DC Converter - - - https://www.ebay.co.uk/itm/225772754265 Would this drive a 'Universal' Motor ?

:unsure: :eek: Hmmm. . . Any curiosity I may have had (over the lapping machine) was sated with the first sight of the price ! - though I was minded of my time as an apprentice at Matrix where I would have used something similar when making slip gauges :) You are absolutely correct about...

Interesting thought but no indication of the speed - for the sellers target audiance of course the rpm is irrelevant, so no real surprise there.

I didn't answer this question in my previous reply :( I suspect that it's a combination of of all of those reasons - with 'because they can' being high - and I would not think the technology is that sophisticated - well I think that I could easily overcome any technical problems as a hobby...

Your idea certainly as me 'thinking' :) - - - I'm quite capable of machining housings for bearings! After some further research/reading I'm wondering about noise and what type of motor I could drive with the likes of this AC Voltage Regulator - - - or similar - of which there appear to be...

Are you suggesting the purchase of a new drill and stripping it down for the motor and controller (switch) ? That may well be an option but I'd be a little concerned about housing the components - and I might need a great deal more assistance/guidance from forum contributors :)

Hear's one reason that I get very confused when looking at Electric Motor details - this eBay item (304999069206) is described as "MY6812 12V 120W High Speed Small Brush Motor W/ Belt Pulley for Electric Scooter" which tells me 12v but a further image has the anotation "Rated voltage range of...

You are quite correct in that the 'variable' speed is specifically to accomodate the needs of 'Grinding' or 'Polishing'. The initial shaping of a rough gemstone benefits from higher speed (say 2k ish) but the final polishing of the facets is better at 1k ish. This is (one of the reasons) why...

I'm not too concerned about 'dust' - although grinding gemstones might be thought of as creating dust - the reality is that water is used as a lubricant so it creates little or no air-born dust. I'll search for "brushed universal motor" - If I find a low-volt DC version, what would I need by...

Oddly, I have a Parvalux Motor but it's not variable speed. It runs at 4k and is 38W. The physical size would pass muster though :)

Actually no, I don't need to go down below ~1000rpm probably and I can use a belt drive to reduce the raw speed. I have a VFD on my Myford S7 and that is quite a large unit - which I would want to avoid.

I'm not sure but aren't they rather larger? (physically)

My grandson (in his 20's - not a 'child') regularly has 'fanciful' ideas about what he wants to do or make - a past 'project' was a one man submarine !! He makes jewellery using Silver & gemstones (ie. not plastic or glass) and having just returened from a holiday in South Africa, asked if I...

I've also seen 'Genuine faux leather' :unsure:

This is probably the most mis-used having taken on the meaning of destroyed :eek: aaaagggghh !

I'm proud to be considered "a pedantic old f@rt." - I also use '...ize' because it is the correct English spelling :D

Every day's a school day - I've previously called such phrases 'Tautology' - other examples "Sahara Desert", "Yellow Jaundice" I wouldn't concider "For Free" to be either though - poor/uncomfortable phrasing yes, but not actually a tautology/pleonasm

Tungsten Carbide is not a material in the same class as Titanium, Steel, Brass etc. It is 'Sintered' - ie. it starts as a powder and is compressed into a mould whilst heated. Further work may be done on the resultant product in the way of grinding but not necessarily. It certainly can't be...

I have a [Crib Board] for my Morse Taper Reamers - the holes were drilled first and then reamed with a 'Morse Taper Reamer' - the board has to be somewhat substantial but could just be 25mm thick but on 'legs'. Most of those look to be MT2 but there's no reason that you couldn't have MT1 &...