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ball mill repair help - dems rubber coated rollers wearin' out,

updated wed 24 nov 04


pdp1@EARTHLINK.NET on tue 23 nov 04


Hi Judy,

Thanks Vince and others for all them good ideas.

I was too busy lately to do more than be behind.

One may usually Boil, or heat nicely in Water, or heat in
some way so as not to burn or scortch it, most 'Rubber'
things as one may wish to streatch over something...they
then return to their usual resillience and size...

Old style solid Rubber Tires for Trucks are a real pain to
mount on their rims...unless one do warm them...and warm
them considerably...

Good luck...

el ve

----- Original Message -----
From: "Vince Pitelka"

> > Maybe someone (Hey Phil in LV) can help me with this
one. The active
> > roller on my ball mill has begun to disintegrate. It
looks like there is
> > something fibrous under the rubber which is falling
apart. (maybe
> > asbestos?).
> Judy -
> I'm sure that Phil could tackle this as well, but I have
repaired a few of
> the old Amaco ball mills. I'm not sure how different the
Craftools ball
> mill is. The Amaco ones have two 3/4" steel shafts
covered with heavy-duty
> fiber-reinforced rubber hose. Eventually the hose
delaminates, and must be
> replaced. That is what is happening with your ball mill.
If it is anything
> like the Amaco, there's no asbestos in there - just
reinforcing fiber.
> When that happens, you need to remove the shafts from the
machine. With the
> Amaco, you would loosen the motor mounting bolts in order
to remove the
> drive belt, unbolt the bearings, loosen the set screws on
the bearings on
> one end of each shaft (on the driven shaft, remove the
bearing on the end
> opposite the drive pulley), and pull the bearing off each
shaft. If they
> are stuck on, you will have to use a gear puller to remove
them. Your local
> mechanic/handyperson can help you with that.
> After that, use a sharp razor knife (wear heavy gloves) to
cut away the
> remaining rubber tubing from each shaft. Scrape all
residue from the
> shafts. Use coarse emery paper to roughen up the surface
of the shafts, in
> order to increase adhesion.
> Go to an industrial supply place that sells industrial
hose supplies, and
> get some high-quality 3/4"-inside-diameter
fiber-reinforced rubber hose, and
> cut it to the same length as what was on the old shafts.
Get some abrasive
> cloth in strip form, wrap one end of a coat hanger around
a piece of it, and
> pull it thorugh the tubing lots of times to rough up the
interior surface.
> At the industrial supply, ask them what the best adhesive
would be. I used
> two-part epoxy, which worked fine, but there might be
something better. In
> any case, whatever adhesive you use, you must slide the
hose onto the shaft
> while the adhesive is fresh and slick. It will require
that "lubrication"
> to get the rubber hose in place, so you must act quickly.
> Good luck -
> - Vince