Brown & Sharpe #9 taper tools / arbors

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BrassCat

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I have acquired a combo horz / vert milling machine (Armor 5H). Horizontal spindle is #9. I purchased an B&S arbor for gang milling used, it has a tang. It will not seat all the way in, it hits a hard stop, metal to metal. I have other threaded arbors that fit properly. Whats up? I have read this taper is capable of holding, although the copy of the book by Cincinnati milling states they stop making ganged arbors with a tang. I will need to make a draw bar, its on my list to restore this mill. I CAN see all the through the spindle hole, it is not blocked. Any info on what to avoid in getting tooling for this spindle would be helpful.

I will have other questions as I work on this mill. Thanks for any help and applicable information.
 
Small horizontal mills using B&S #9 typically use a drawbar and an arbor with no tang. I suppose you could cut it off.
There may be some older mills out there that do use tang arbors- probably some of the larger Cincinnatis
 
Likely the taper(s) are worn, allowing the shoulder of the male taper's tang to bottom out; you could cut the tang off and drill and tap the arbor for a drawbar, or mill the tang shoulders back a bit and shorten the tang to allow the taper to seat properly, or in a pinch, simply wrap a sheet of paper around the taper to tighten the fit, Tang style adaptors generally work fine without loosening in use if they are initially driven in with a energenic whack with a lead hammer, been there, done that, very seldom had one come loose, usually without any damage.
 
I recently sold my small knee mill that had BS 9 spindle. A couple of years ago I bought an NOS BS9 to #2? jacobs taper arbor and I put a good 1/2" Jacobs chuck on it.
The arbor had the tang and looked a LOT like a #3 Morse taper. Since I couldn't use the drawbar with it I just used it as is.
I never did any Real heavy drilling with it - I have a good press for that. But it never once spun in the spindle. I would grind or cut the tang so it works, forget about the drawbar and be happy.
 
I have an older US Machine Tools #1 horizontal mill. It uses a B&S #9 taper. This particular machine doesn't use a drawbar to pull the arbor into the machine socket. As mentioned, the arbor has a female thread on the rear. It's pulled tight into the socket with 1/2-13 a bolt. To remove the arbor the bolt is loosened a couple turns and hit with a dead blow hammer. The spring collet holder uses the same mechanism to seat and unseat it in the socket.

Here's a copy of the US Machine Tool #! mill sales brochure. Pictures of the arbor and spring collet holder are on the last couple pages. This edition was published after US Machine Tools was purchased by Burke Mills.
 

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  • #1 Mill Sales Brochure.pdf
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projectnut said:
I have an older US Machine Tools #1 horizontal mill. It uses a B&S #9 taper. This particular machine doesn't use a drawbar to pull the arbor into the machine socket. As mentioned, the arbor has a female thread on the rear. It's pulled tight into the socket with 1/2-13 a bolt.
Click to expand...

I am missing something..... isn't that bolt the draw-bar?
Brian
 
It is, but some of the more expensive models have a handwheel style drawbar similar to a collet drawbar used on a lathe
 
Thanks for all the support. Further examination suggests spindle bore is for
type B tools only. Threaded. This machine date 1945 - 1960 ??
I will use thread collet and end-mill holders.

Discovered bell mouthed spindle bore. New Thread.
 
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