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ball mill repair help

updated tue 23 nov 04

 

Richard Aerni on sun 21 nov 04


On Sun, 21 Nov 2004 16:03:06 -0800, j e motzkin wrote:

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?).
>
>It is an old one...Craftools Inc New York, it says. any ideas on how to
repair or replace this thing?

Hi Judy,
I'm sure there are a number of ways to get the thing back in shape. A
rubber sheet with a fancy glue would no doubt work fine. What I did with
mine, oh, about 20 years ago, was to wrap the roller (while turning slowly)
with about 1/4 inch of duct tape (in three equidistant strips). These
raised duct tape strips then became the contact points with the jar. They
are still there these many years later...the temporary fix became rather
permanent. I must add, though, that I haven't used the ball mill in ten
years.
Good luck with this, and good to hear from you again!
Richard Aerni
Rochester, NY

Vince Pitelka on sun 21 nov 04


> 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

Vince Pitelka
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
vpitelka@dtccom.net, wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka/
http://www.tntech.edu/craftcenter/

Louis Katz on sun 21 nov 04


I have used rubber radiator hose held on with two hose clamps. There
might be something better.
Louis

On Nov 21, 2004, at 6:03 PM, j e motzkin wrote:

> Maybe someone (Hey Phil in LV) can help me with this one. The active
> roller on my ball mill has begun to disintegrate.


WIKI site http://www.tamucc.edu/wiki/Katz/HomePage

Marcia Selsor on sun 21 nov 04


I have rebuillt the hoses on the rollers on ball mills. You can slide =20=

the rubber off the roller of you tale it apart. If you remove the steel =20=

rod from the bearing and slide the disintegrated part off the steel =20
rod, you can then replace the rubber sliding it back onto the steel rod =20=

using lots of soap. This seems to be necessary every decade or so of =20
use. I doubt if there is any asbestos in these rubber hoses. It is just =20=

fiber glass or some sort of reinforcement.
Marcia Selsor
On Nov 21, 2004, at 5:03 PM, j e motzkin wrote:

> Maybe someone (Hey Phil in LV) can help me with this one. The active =20=

> roller on my ball mill has begun to disintegrate. It looks like there =20=

> is something fibrous under the rubber which is falling apart. (maybe =20=

> asbestos?).
>
> It is an old one...Craftools Inc New York, it says. any ideas on how =20=

> to repair or replace this thing?
> Judy
>
>
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j e motzkin on sun 21 nov 04


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?).

It is an old one...Craftools Inc New York, it says. any ideas on how to repair or replace this thing?
Judy


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Discover all thatís new in My Yahoo!

Logan Oplinger on mon 22 nov 04


On Sun, 21 Nov 2004 16:03:06 -0800, j e motzkin wrote:

>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?).
>
>It is an old one...Craftools Inc New York, it says. any ideas on how to
repair or replace this thing?
>Judy


Hello Judy,

If Phil does not respond, maybe this will help.

Remove the roller if possible. If the rubber covering on the metal roller
has disintegrated enough, it may be easy to remove just by pulling off. I
suspect the fibrous material you are seeing is a fabric to reinforce the
rubber, most likely cotton, nylon or polyester. Different types of rubber
hose are reinforced this way. Go to your nearest hardware/automotive
supply store to find rubber hose of the same internal diameter (I. D.) as
the diameter of the metal roller, and slide a length onto the metal
roller. If the fit is a little snug, good. You may need to apply a little
soapy water or WD-40 to help the sliding process. If the fit is not so
snug, then a couple of hose clamps on each end should work (check to make
sure there is room between the roller and ball mill frame for the clamps to
rotate freely). If you can't find rubber hose, then the clear PVC tubing
will work.

Logan Oplinger
Another Tropical Island

Taylor from Rockport on mon 22 nov 04


Hey Judy!

If I'm not mistaken, your rollers are covered with radiator hose. This is
what I used to fix the ball mill at Baylor. Take the old hose off, go down
to a good car parts store and get some hose that fits over the bar, barely.
Don't get a size that is too tight, however. You are going to slather slow
set two part epoxy on the bar after you clean it off real well then slip on
the radiator hose. It should be a snug fit. Vince P. helped me out on this
project and I'm sure he will chime in here.

Go get 'em!

Taylor, in Rockport


On Sun, 21 Nov 2004 16:03:06 -0800, j e motzkin wrote:

>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?).
>
>It is an old one...Craftools Inc New York, it says. any ideas on how to
repair or replace this thing?
>Judy