Canedy otto radial drill

New to practical machinist
I have a large radial arm drill canedy otto serial # T-2081 and I am trying to remove spindle for repair. I have removed 2 set screws in collar and dogged shaft at taper then used a spanner on collar but I have turned collar like 20 revolutions and spindle is not getting looser so I am questioning whether or not collar is threaded. Need help on removal procedure. sorry for sideways pics....haven't figured that out yet.

Maybe the set screws made a groove or burr under the collar, and it's just stuck on that ?

That is very possible, but would like to confirm that collar is not threaded so I don't do more damage pressing it off.

Just an update, put shaft assy in an arbor press and collar came right off, so the next person will know that collar is not threaded and that shaft uses 2 Timken taper roller bearing # 08125 and a couple pics for exploded view. Thank you for the reply Tom, got my wheels turning again.

Many times, if I have a collar that is retained with a set screw
or two, what I do is clean out the grease and dirt from the threaded
hole really well. Like use carburetor or brake spray. Then blow out
with air. Get a strong light and look inside the threaded hole.
You can usually see the round burr from the conical tip of the
set screw. The trick is to take a flat bottom pin punch and knock
the raised metal back down flush with the surface. That way, the
collar should slide off, not being impeded by the raised metal.
Also, use a hammer, striking with short sharp blows, and tap all
the way around the collar. This will also knock down any burrs
that may be on the shaft. If you try to move the collar and get
a little movement, at the point where it binds up again, that means
a burr is stopping from proceeding. Continue to knock around the
collar with a hammer, rotating and knocking down the burrs as you go.
This procedure is a common way to take collars off. Problem is that
no one is a mechanic any more. They beat with their hammer with
reckless abandon. They think it is a caveman slug fest. They think
it is a manly competition any time they use a hammer.
To use a hammer with intelligence and finesse is an ability that
is not known and may never be known to most mechanics. I do take pride
in using the smallest hammer possible to accomplish a given task.
Use your brains, not your muscle. Else you will destroy something.
Sadly, for some people, that is the point. Sheesh . . .


--Doozer

Any decent engineer would be drilling what we called a “ dimple “ into the shaft/screw on assembly. That way your fixing screws don’t create any burrs in the first place.

Regards Tyrone.

In the photo of the separated spindle, it looks like there WAS a dimple under the collar, but it's possible the screw raised a small burr anyway.
On second look, I see holes for extra screws added, so maybe that was the problem.
But all's well that ends well :~)