i have been supplied a number of chucks with my mill but there is nothing written on them. most of them are the same (approximately the right size to seat an ER25 collet and secured by screwing on a nut over the top).
Could anyone clarrify what chuck is meant to be used with this machine? are they completely interchangeable? and is there any way of measuring particlaur points on them to work out what I have? They look like BT30 or 40's at the collet end but the other end looks more like the images i get in google when searching for a QC30 chuck.
Am i correct in thinking the QC and BT prefix denotes how the chuck fits to the mill rather than how the chuck secures the collet?
Any light anyone can shed on this for me would be greatly appreciated.