I just bought a Bridgeport series 1 milling machine from the government auction for $1100. Ive bought alot of big equipment from government auctions in the past such as saws, brakes, shears, etc and never been burned yet by getting something that didnt work but you never know what you will get. Well Ive wanted a mill for a long time even though I know nothing about them but I want to learn so this one came up for auction and I bit. I havent put power to it yet because I am currently waiting for a plug to arrive in the mail which I purchased off ebay. Just like all their equipment they let it sit outside in the elements for months on end before finally auctioning it off. Out of all the equipment ive ever bought this one took the elements the hardest. Lots of unpainted surfaces that rust was working on like all the graduation dials/tapes whatever you call them. And the knobs and knurled nuts. However I put evapo rust on them and the rust came right off. The ways werent rusty all thanks to the oil on them. All in all it looks pretty decent now. It has power feed. So here is my question. Now remember I am totally new to mills but I watched some youtube videos and when they put the collet in the chuck they said you had to sometimes rotate the collet around a bit because the collet it slotted and the chuck is keyed. From my research I determined the Bridgeport takes R8 collets. Well I bought some used Hardinge collets off ebay and put one in the chuck and it was a nice tight fit once it got clear up on the chuck, however there is no key in that chuck. There is no slot. I ran my finger around the inside of that chuck and it is smooth as a babys bottom all the way around as far up as I could reach then I pulled out the threaded rod (dare I call it a spindle???) from the top and looked down into it from the top and it looked smooth bore all the way through. Is mine missing something? Or did I just misunderstand about it having a keyed chuck that the collet has to line up with in order to insert the collet into the chuck? The threaded rod (spindle???) does screw into the collet just fine, but again, no key. Thank you