Hi all

I am trying to tube set a 5mm facetted stone.

I have cut the tube to length, soldered to the ring shank and then have used a 5mm setting burr (brand new from cookies) to make a seat for the stone.

I have used a 4mm setting burr a couple of times before and managed OK.

This time, every time I tried to use the burr it kept cutting in and snatching on the metal (if that makes sense) - I'm using a clarke flex shaft (like a dremel) and I have lubed the burr with a little oil. this happened even when I was trying to do a tiny tiny amount.

I've now wrecked the tube so I'm walking away for today and hope to have another go another day !

Really hope someone can tell me what I'm doing wrong........

Thanks

Jane