Delta 17-600 Drill press spindle assembly question

[rrgg654]

I am trying to refurbish a 1967 Delta Rockwell drill press model 17-600. The lower spindle shaft has a threaded collar at the end just above the Jacobs taper. It is used in conjunction with a special Jacobs chuck with matching female threaded collar that is used to pull the Chuck onto the taper and keep it there.
The collar on the spindle shaft is pinned in place and the collar is what holds the lower bearing assembly together.
Problem is I mangled the pin on my first attempt to reinstall the collar after doing a bearing replacement. Also the collar is a very tight fit and I am stumped as to how to put it on and have the pin holes perfectly aligned.
The through hole seems a weird size. I can fit a 4.5mm drill bit through with some play but not a 5mm or 3/16". The hole is also slightly offset.

What type of pin would you say this is?
I could use a split spring pin but am concerned about shear strength compared to a solid pin.

Any suggestions and insights are greatly appreciated.

Thanks

 

[454ragtop]

Shear strength shouldn't matter, not really any force on that pin. Is the pin a tapered pin by chance? If it is, the hole in the collar and the spindle will each have a small and slightly larger size, and will only go together 1 way. If this doesn't help, ask over on OWWM.org, one of the Delta guys over has had one of these apart for sure.

 

[GLTHFJ60]

That looks like a tapered pin in the picture, but hard to tell.

Are you aware if the special threaded jacobs taper is originally present on all 60s era 17-600? My Delta Rockwell's chuck is just attached to the taper, not a threaded collar.

 

[454ragtop]

That looks like a tapered pin in the picture, but hard to tell.

Are you aware if the special threaded jacobs taper is originally present on all 60s era 17-600? My Delta Rockwell's chuck is just attached to the taper, not a threaded collar.[/QUOTE


There were a couple different spindle cartridges, this one a stub spindle with a direct mount chuck, and another with a Morse taper socket, #2MT. There may have been a #3MT socket as well, though I've never seen one. Woodworkers tend to like the stub spindle, to install a mortise attachment, while metal workers tend to prefer the Morse, to be able to use MT shanked drills.

 

[Whitworth]

#1: don't assume the hole in the collar is perfectly drilled thru the dead center of the spindle. It may be off ever so slightly, so as to fit "one way" so to speak.

#2: my experience with those is a spring pin is often used. Even if not in your case, maybe a 3/16 spring pin would be a good substitute.

#3: a small arbor press will help pushing the pin on, less likely to fold over or mangle the pin than hammering.

 

[rsanter]

If it was me I would put the shaft in the freezer overnight and place the colar on a light bulb. Odds it will slip on and you can index it by hand to line the hole up

Bob