That long hanging thing in the middle of this picture? That’s my flex drive. The first flexible shaft was invented by the famous Scottish engineer James Hall Nasmyth (1808-1890), who is best known for his later development of the steam hammer.
The motor is this part the top, which, through a long spiral shaft, drives the little piece at the end. If you’re thinking ‘dentist’, you’re absolutely right! These are used by dentists, too. They’re like a tiny drill at the end of a long hose.
There are endless variations of bits you can use with your flex drive.
My favourites are a particular diamond burr, kindly given to me by the lovely Bill from my Goldsmithing class (I use it all the time!) and my slotted mandrels (for emery paper – that’s one you see on the flex drive head in the picture above this one). I have so many other very useful attachments for this great device! I use my flex drive on just about every piece I make. Thanks, Mr Nasmyth!