Removing tooling from Cat 50 holders

[WhoWhatNow]

I picked up several Cat 50 tool holders at an auction. I don’t have anything that runs Cat 50 holders but want the tooling for my Bridgeport. How do I unmount the boring head and chuck from the holder? Are they simply screwed on? What is the best way to hold the Cat 50 holder?

 

[toolchaser]

The drill chuck is probably a Morse taper, the boring head COULD be , most are straight shank. Back out the pull stud to see if that draws the tool in although thats unlikely. As far as holding a Cat 50 you can lay flat bar in the drive lug cutouts and clamp in a standard vise, just don`t crank on it. There are Cat toolholders that are shrink fit but I don't see any signs of heat on your toolholders

 

[larry_g]

for the drill chuck I agree that it is MT. Remove the pull stud, it unscrews, and use a drift to drive the chuck out. If that doesn't work then remove the chuck from the taper at the chuck with wedges.

For the boring bar I would think it would unscrew. If there is a number on the cat 50 you could look it up.
It might be t his one, https://www.lyndexnikken.com/BT50-7-8-20-Boring-Head-Holder-1120p726.htm

 

[rsanter]

for the drill chuck I agree that it is MT. Remove the pull stud, it unscrews, and use a drift to drive the chuck out. If that doesn't work then remove the chuck from the taper at the chuck with wedges.

For the boring bar I would think it would unscrew. If there is a number on the cat 50 you could look it up.
It might be t his one, https://www.lyndexnikken.com/BT50-7-8-20-Boring-Head-Holder-1120p726.htm

This

 

[Monza Harry]

If that boring head is a 2" that is likely a 7/8-20 thread if that is it is a 3" it could be a 1 1/2-18 tread they are usually right hand thread place a dowel in the cross hole and give it a sharp whack with a piece of brass os a dead blow hammer to loosen the boring head. Here is a McMaster link to shanks for it after you remove it.
https://www.mcmaster.com/boring-heads

 

[matt_i]

If they're shrink fit holders you're gonna need the blue wrench.

Unless there are setscrews up around the drive collars there isn't any other way of holding them.

I don't see the threaded interface on the boring head either....

 

[American Locomotive]

On the drill chuck holder, there is a slot on the side that you can drive a wedge into, that will eject the chuck's arbor from the holder. Then you can use Jacob's Chuck wedges to remove the chuck from the arbor.

I also see what appears to be a set screw on each holder.

 

[WhoWhatNow]

Thanks, guys. I was able to get the drill chuck out with no trouble. I completely missed the slots for the wedge on the taper of the holder. I’m still working on the boring head. It is a 3” Criterion so hopefully it is threaded on.