judaspre1982 wrote:Tim, two are identical and came with 1955 machines and are the 3326 Jacobs. One is the Jacobs-Multi- Craft - Chuck and has MC8K26 stamped on it. It is solid in the middle and smooth not knurled as posted earlier in this thread. Its key however will fit the 1995 SS chuck perfectly while the other keys will not. The Jacobs MCC came with one of the 1955 MK V purchases but I do not know when it was manufactured. The key for the MCC is stamped KK.-------Dave
Thanks, Dave. Mike @ Jacobs has already told me that Jacobs no longer makes the Multi-Craft chuck MC8K26. I have not received an answer to my recent e-mail to him asking about the 3326. Their on-line information does not show a 3326, but it does show a 3326A, which Mike tells me requires a key to hold it into place on the spindle rather then a set screw and a left hand threaded screw down the center.
This is a key drive chuck. It does have a 5/8" straight taper, but it's only a slip fit condition. You would still need to have a key perpendicular to your shaft to drive the chuck and a left hand threaded hole in the center of your shaft for the retaining screw to keep the chuck on the shaft. I think the attach drawing will help you understand how the chuck needs to be mounted.
He sent me a spec sheet on the 3326A, but it is knot clear enough to make out when I resize it to fit on this forum. If anyone wants the spec sheet on the 3326A, PM me your e-mail address, and I will send it to you.