GeoLane at PTD dot NET wrote in message
...

I posted this in another newsgroup, but thought I'd try here as well
since some of you guys have done some unusual things before or know a
workaround that isn't obvious.

I'm posting for a fellow scrounge who asked if I knew a way to machine
the ID of a clutch (throwout?) bearing from 2.5" to 2.75"

He can't find a bearing to match so he asked if the inner race of a
bearing that's a close match could be machined to a larger diameter.
There is no external lip to grab the inner race in a chuck to hold it,
so it would have to be held internally on one end. The race is 3/4"
long. Machine in from one end, then turn it around and machine the
other side till they meet in the middle. My thought was a toolpost
grinder and a lathe until I heard that he needs to increase the
diameter by 0.250. I don't know if a carbide boring bar would machine
a bearing or not. Is it doable with a toolpost grinder / die grinder
held in the toolpost? Has anybody ever done this with a bearing?

For more detail. This is a clutch bearing for a Ford Major Diesel
tractor built in 1964. It has a 2 stage clutch and that's where the
problem is. Parts for the single stage clutches apparently are
available, but not for the 2 stage clutches he says. He's checked with
a national bearing supplier or two and the guys say they can't match
the bearing. The closest a supplier has is the one mentioned above
that would need to be machined larger - there's enough metal in the
inner race to do it. The shaft / support that the bearing rides on
cannot be made smaller he says. If there's a little known supplier of
unobtainable bearings or another known workaround to this problem in
Ford tractors rather than machining a bearing, he'd be all ears.

Thanks

RWL



You may have already been here but these guys are a good resource.
http://www.ytmag.com/cgi-bin/viewit....ford&th=305623
Steve

"Up North" wrote in message
...

GeoLane at PTD dot NET wrote in message
...

I posted this in another newsgroup, but thought I'd try here as well
since some of you guys have done some unusual things before or know a
workaround that isn't obvious.

I'm posting for a fellow scrounge who asked if I knew a way to machine
the ID of a clutch (throwout?) bearing from 2.5" to 2.75"

He can't find a bearing to match so he asked if the inner race of a
bearing that's a close match could be machined to a larger diameter.
There is no external lip to grab the inner race in a chuck to hold it,
so it would have to be held internally on one end. The race is 3/4"
long. Machine in from one end, then turn it around and machine the
other side till they meet in the middle. My thought was a toolpost
grinder and a lathe until I heard that he needs to increase the
diameter by 0.250. I don't know if a carbide boring bar would machine
a bearing or not. Is it doable with a toolpost grinder / die grinder
held in the toolpost? Has anybody ever done this with a bearing?

For more detail. This is a clutch bearing for a Ford Major Diesel
tractor built in 1964. It has a 2 stage clutch and that's where the
problem is. Parts for the single stage clutches apparently are
available, but not for the 2 stage clutches he says. He's checked with
a national bearing supplier or two and the guys say they can't match
the bearing. The closest a supplier has is the one mentioned above
that would need to be machined larger - there's enough metal in the
inner race to do it. The shaft / support that the bearing rides on
cannot be made smaller he says. If there's a little known supplier of
unobtainable bearings or another known workaround to this problem in
Ford tractors rather than machining a bearing, he'd be all ears.

Thanks

RWL



You may have already been here but these guys are a good resource.
http://www.ytmag.com/cgi-bin/viewit....ford&th=305623
Steve

I did another search and there seems to be a company called Bare - Co or
Sparex that sells parts for these tractors. Hope this helps.
http://search.yesterdaystractors.com...01&lastrec=125
Steve

GeoLane at PTD dot NET wrote in message
...

I posted this in another newsgroup, but thought I'd try here as well
since some of you guys have done some unusual things before or know a
workaround that isn't obvious.

I'm posting for a fellow scrounge who asked if I knew a way to machine
the ID of a clutch (throwout?) bearing from 2.5" to 2.75"

He can't find a bearing to match so he asked if the inner race of a
bearing that's a close match could be machined to a larger diameter.
There is no external lip to grab the inner race in a chuck to hold it,
so it would have to be held internally on one end. The race is 3/4"
long. Machine in from one end, then turn it around and machine the
other side till they meet in the middle. My thought was a toolpost
grinder and a lathe until I heard that he needs to increase the
diameter by 0.250. I don't know if a carbide boring bar would machine
a bearing or not. Is it doable with a toolpost grinder / die grinder
held in the toolpost? Has anybody ever done this with a bearing?

For more detail. This is a clutch bearing for a Ford Major Diesel
tractor built in 1964. It has a 2 stage clutch and that's where the
problem is. Parts for the single stage clutches apparently are
available, but not for the 2 stage clutches he says. He's checked with
a national bearing supplier or two and the guys say they can't match
the bearing. The closest a supplier has is the one mentioned above
that would need to be machined larger - there's enough metal in the
inner race to do it. The shaft / support that the bearing rides on
cannot be made smaller he says. If there's a little known supplier of
unobtainable bearings or another known workaround to this problem in
Ford tractors rather than machining a bearing, he'd be all ears.

Thanks

RWL


If you cannot find the replacemnt and need to machine the bore of the
bearing oversize use a cbn tipped insert or a ceramic insert to cut it.


John

I posted this in another newsgroup, but thought I'd try here as well
since some of you guys have done some unusual things before or know a
workaround that isn't obvious.

I'm posting for a fellow scrounge who asked if I knew a way to machine
the ID of a clutch (throwout?) bearing from 2.5" to 2.75"

He can't find a bearing to match so he asked if the inner race of a
bearing that's a close match could be machined to a larger diameter.
There is no external lip to grab the inner race in a chuck to hold it,
so it would have to be held internally on one end. The race is 3/4"
long. Machine in from one end, then turn it around and machine the
other side till they meet in the middle. My thought was a toolpost
grinder and a lathe until I heard that he needs to increase the
diameter by 0.250. I don't know if a carbide boring bar would machine
a bearing or not. Is it doable with a toolpost grinder / die grinder
held in the toolpost? Has anybody ever done this with a bearing?

For more detail. This is a clutch bearing for a Ford Major Diesel
tractor built in 1964. It has a 2 stage clutch and that's where the
problem is. Parts for the single stage clutches apparently are
available, but not for the 2 stage clutches he says. He's checked with
a national bearing supplier or two and the guys say they can't match
the bearing. The closest a supplier has is the one mentioned above
that would need to be machined larger - there's enough metal in the
inner race to do it. The shaft / support that the bearing rides on
cannot be made smaller he says. If there's a little known supplier of
unobtainable bearings or another known workaround to this problem in
Ford tractors rather than machining a bearing, he'd be all ears.

Thanks

RWL

If you can't find it, I'd go the other way. Find any throwout bearing larger
than your shaft. bush the shaft and modify the yolk. Just another way to
skin the cat.

The tractor salvage yards around here are full of ford majors. I suspect
finding parts is the reason. If he's not putting a ton of hours on it, buy
the part from the slavage yard.

Karl

On Fri, 13 Mar 2009 22:49:30 -0500, "Up North"
wrote:

You may have already been here but these guys are a good resource.
http://www.ytmag.com/cgi-bin/viewit....ford&th=305623
Steve


I"m not sure how net savvy Frank is, but I'll show him the link on
Monday and we can explore that if he wasn't aware of it. He stopped
in my office because he wondered if I could convert a bearing he'd
found. A bearing that doesn't need to be altered is a MUCH more
practical solution to the problem. Thanks.

On Sat, 14 Mar 2009 06:14:32 -0500, "Karl Townsend"
wrote:

If you can't find it, I'd go the other way. Find any throwout bearing larger
than your shaft. bush the shaft and modify the yolk. Just another way to
skin the cat.

The tractor salvage yards around here are full of ford majors. I suspect
finding parts is the reason. If he's not putting a ton of hours on it, buy
the part from the slavage yard.

Karl

Thanks Karl. I'll show him the series of posts on Monday and he can
pursue some of those leads.