Delta Dp 220 Drill Press Owners Manual
I have my great uncle's DP220. A really Greg tool from the 1950s or so.Unfortunately the Chuck decided to come off the spindle the other day. It's not a taper or set screw connection but a reverse thread onto the spindle.The chuck is a Delta Grip 17/32'. An early keyless model.Does anyone know the procedure to get it back on?The trouble is there's a threaded floating disk captive inside that holds it to the spindle (supposed to).
And below that threads to open and close the jaws. As the disk gets up to the shoulder at the top of the threads it freewheels inside the housing.Any help from a well experienced (not daring to call them old!!!) would be appreciated! Good tries from all and I did extensive searching on Practical Machinist to no avail. Even the discussion link Allen provided talks about Jacobs Taper which my spindle just does not have.I ended up by reassembling the chuck on the spindle and using Penetrating Loctite on the threads of the disk. Close to a permanent install but I don't see needing another chuck. If I do I'll be shopping for another spindle too!Thanks for everyone's help. Especially Robert K, the Guy must be a Rocket Scientist or something!
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The shaft shown in the top of the picture is the drill press Spindle with the reverse threads shown extending into the body. The Disk is the part shown through the cutaway (although it's not shown cut itself). The Disk needed to be captive on the Spindle to activate the Jaws but would continually back off letting the whole chuck release from the machine.Clean threads, the right Loctite and a ton of patience rebuilding this thing (at least 20 times) has brought my vintage drill press back to life!!
Delta Dp 220 Drill Press Owners Manual Download
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Folks on OWWM also speculated that it was an improvised method to retain the foot pedal from flying up when it was released, but it wouldn't have offered much in the way of throw if the foot feed went through there.I don't think it was a depth stop either, as it is far easier to just adjust the depth stop on the quill than it would be to get down and unbolt that thing and move it around.Hence, it wasn't included in the After.