R4-2RS is the bearing number, an imperial measurement bearing
Mike,
I just found this thread. It's old.
Your version of a QCTP drill chuck has been copied by the industry.
For small drills I think this would be a great idea to add feel to the process.
It's on my to do list.
 
I also just came across this old thread by accident. Once I saw the pictures, my first thought was that, if the drill chuck is *fixed* and faces the spindle, then this basically becomes an easily adjustable tailstock and it could be an excellent approach to small hole drilling -- especially when the actual tailstock is not accurate enough and/or not adjustable, like in my little Sherline lathe. I was hoping to start making some custom tool holders and I hope to eventually be able to try this out. Thank you!
 
I also just came across this old thread by accident. Once I saw the pictures, my first thought was that, if the drill chuck is *fixed* and faces the spindle, then this basically becomes an easily adjustable tailstock and it could be an excellent approach to small hole drilling -- especially when the actual tailstock is not accurate enough and/or not adjustable, like in my little Sherline lathe. I was hoping to start making some custom tool holders and I hope to eventually be able to try this out. Thank you!
I’d like to see what you come up with!
 
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