E Kinney wrote:

I've never thought of a chain hoist as a precision machine. Does the
friction material have to be perfectly round that you have to do all the
steps you have described?
Why not just use the technique for making common gaskets?

That's simply the only way I know of to cut clean disks in tough rubber
sheets. How would you do it? The OD would be pretty easy, could cut that
with tin snips. But the ID - oy vey. Well, maybe a hole saw would work.

No, it isn't precision, but the closer you cut it to perfect, the more
material you have that bears so the better it will work. You could hack
out the middle with a chisel and make a square hole, but the friction
disc would have less bearing area ..

GWE

"Grant Erwin" wrote in message
...
|I have an ancient chain hoist which wasn't holding the hook. As fast as I
| cranked it up, the hook would slip back down once I let go of the chain.
| I tore it down and found that the friction clutch disc had worn to the
point
| where it hardly bore.
|
| This is an awesome old chain hoist which Ernie gave me. I really want to
make
| it work correctly again. Has anyone else solved the problem of where to
get
| a custom one-off replacement friction disc?
|
| For an explanation of how the friction clutch works in a chain hoist, see:
| http://tinyurl.com/2nkh5j
|
| I see lots of manufacturers of friction material listed on thomasnet.com,
but
| finding one which will make an affordable one-off part for me is totally
another
| thing. If I had to, I could buy the smallest sheet possible and make the
disc
| on a lathe, using a method about like this:
|
| mount an X-acto knife in a boring tool on center height, parallel to lathe
axis
| put a lathe center in the lathe spindle
| move the cross-slide until the knife point is on the lathe axis
| i.e. pointing exactly at the lathe center
| zero the cross-slide dial & remove lathe center
| put the faceplate on the lathe spindle
| cut a disk of plywood the size of the faceplate
| cut a disk of the friction material the size of the plywood (or smaller)
| punch identical bolt circles in the material and the plywood
| bolt through to the faceplate, so its faceplate|plywood|friction material
| crank the X-acto knife out the radius of the inner hole
| start the lathe and feed the knife in, cutting out the ID
| crank the X-acto knife out to the radius of the disc OD
| cut out the disc
|
| But I don't want to buy a whole sheet!
|
| Anybody been through this?
|
| Grant