I have a 16" South Bend Lathe with a Quick Change gearbox.
The steel bushings for the gear shafts in the gear box are worn badly.
Can I use Delrin to make the new bushings or will the material not
hold up?
I'm asking becasue I have Delrin available.
I can certainly use steel if need be.
Dan

"Dan " Dan@ wrote in message ...
I have a 16" South Bend Lathe with a Quick Change gearbox.
The steel bushings for the gear shafts in the gear box are worn badly.
Can I use Delrin to make the new bushings or will the material not
hold up?
I'm asking becasue I have Delrin available.
I can certainly use steel if need be.
Dan

If you make the choice to use Delrin, I'd strongly urge you to not use
conventional stuff just because you have some available. Delrin AF is a
Teflon filled material that will serve quite nicely as a bearing material,
although I don't know if even that will serve the purpose.

I think it's safe to assume that if a bearing bronze has worn out, Delrin
won't serve nearly as long, although for home use, where you may not use the
machine much, could be it would serve you a life time. I'd make the
complexity of the job a factor. If you can replace the bushings easily, a
fast teardown and assembly, go for it. If not, and it's a tough job,
guarantee your work by choosing a known properly performing material.

Harold

It's not that bronze bearings wore out, this lathe has steel on steel.
Steel shaft with steel bushings, and no oil. That's the real culpret,
no oil.
The shaft is much more difficult to make than the bushings. I'd much
rather the bushings wore out than the shaft.
My whole lathe is suffering from no oil syndrome.
I oil everything. Too much. I'd rather wipe up oil than make parts for
my machine.
When I went to machine shop school, (3 years) if you didn't clean and
oil the machine, you missed the bus ride home. My Mom didn't drive so
I had to walk home, several miles. Once I got home, there was hell to
pay, so my machine was the cleanest in the shop, every day!
It breaks my heart to see machines worn out becasue no one oiled it,
but had time to sit on thier butt and BS.
I'll try delrin Bushings and see what happens.

On Thu, 15 Nov 2007 13:13:54 GMT, Dan@ (Dan ) wrote:


I'll try delrin Bushings and see what happens.

You'll find some superior alternatives to delrin he
http://www.igus.com/

For example...
http://www.igus.com/igubal/igall2.asp?p=G300

Small sizes are inexpensive there's no minimum order.

--
Ned Simmons

On Nov 15, 10:13 pm, Dan@ (Dan ) wrote:
It's not that bronze bearings wore out, this lathe has steel on steel.
Steel shaft with steel bushings, and no oil. That's the real culpret,
no oil.
The shaft is much more difficult to make than the bushings. I'd much
rather the bushings wore out than the shaft.
My whole lathe is suffering from no oil syndrome.
I oil everything. Too much. I'd rather wipe up oil than make parts for
my machine.
When I went to machine shop school, (3 years) if you didn't clean and
oil the machine, you missed the bus ride home. My Mom didn't drive so
I had to walk home, several miles. Once I got home, there was hell to
pay, so my machine was the cleanest in the shop, every day!
It breaks my heart to see machines worn out becasue no one oiled it,
but had time to sit on thier butt and BS.
I'll try delrin Bushings and see what happens.

That sounds like the Chinese lathe I bought. When taking it apart to
clean out the swarf - it was a NEW lathe! - I noticed the steel on
steel bearing idea on some places of the gear change shafts. They did
provide oil holes and a crude gallery, I make sure its always oiled
well. So far its been running well.
I did make a new, longer, lay shaft, it was not that difficult. The
idea of the longer, counter rotating shaft is to pick up drive power
for a rotary table mounted on the cross slide. Now I have a poor mans
milling machine capable of machining worm gears and pipe bender
mandrels.
Klaus

What type of gearbox is this, a single or double tumbler?

I'm not aware of steel bushings on Southbend gearboxes, but they do have
steel shafts running in holes bored in the cast iron. These are lubricated
by wick fed oilers.

I've rebuilt double tumbler gear boxes by boring the cast iron to accept
sintered bronze bushings.

If you have steel bushings in there perhaps someone has modified it before.

Delrin "AF" is more expensive than bronze FWIW.

Tony



"Dan " Dan@ wrote in message ...
I have a 16" South Bend Lathe with a Quick Change gearbox.
The steel bushings for the gear shafts in the gear box are worn badly.
Can I use Delrin to make the new bushings or will the material not
hold up?
I'm asking becasue I have Delrin available.
I can certainly use steel if need be.
Dan

16" South Bend. Single tumbler, 1947 vintage. 6' bed.
Doesn't seem like a retrofit, but it might have been.
Lots of steel shafts truning in holes bored in casings.
Changing lots of felt wicks and checking all the oil feed holes. Even
drilled a few and added where they were missing.
Some shafts, steel on steel and no way to lube them.
Wonder what they were thinking there?



On Thu, 15 Nov 2007 19:29:24 -0500, "Tony" wrote:

What type of gearbox is this, a single or double tumbler?

I'm not aware of steel bushings on Southbend gearboxes, but they do have
steel shafts running in holes bored in the cast iron. These are lubricated
by wick fed oilers.

I've rebuilt double tumbler gear boxes by boring the cast iron to accept
sintered bronze bushings.

If you have steel bushings in there perhaps someone has modified it before.

Delrin "AF" is more expensive than bronze FWIW.

Tony



"Dan " Dan@ wrote in message ...
I have a 16" South Bend Lathe with a Quick Change gearbox.
The steel bushings for the gear shafts in the gear box are worn badly.
Can I use Delrin to make the new bushings or will the material not
hold up?
I'm asking becasue I have Delrin available.
I can certainly use steel if need be.
Dan

on a Southbend single tumbler gear box, there are over 7 oil points, with
most of them having Gits oilers. Plus felt wicking to feed oil to internal
points. What shaft do you have that isn't getting oil?

The housing is cast iron, steel shafts run nicely in cast iron jornals. I
don't see any steel bushings in my gear box, or the exploded parts diagram
reference I have.

On my single tumbler machines , my pet peeve is that the excess gearbox oil
drips down over the motor cabinet and makes a mess. But a few drops of oil
with each use will keep those gearboxes running smooth forever.

Tony


"Dan " Dan@ wrote in message ...
16" South Bend. Single tumbler, 1947 vintage. 6' bed.
Doesn't seem like a retrofit, but it might have been.
Lots of steel shafts truning in holes bored in casings.
Changing lots of felt wicks and checking all the oil feed holes. Even
drilled a few and added where they were missing.
Some shafts, steel on steel and no way to lube them.
Wonder what they were thinking there?



On Thu, 15 Nov 2007 19:29:24 -0500, "Tony" wrote:

What type of gearbox is this, a single or double tumbler?

I'm not aware of steel bushings on Southbend gearboxes, but they do have
steel shafts running in holes bored in the cast iron. These are lubricated
by wick fed oilers.

I've rebuilt double tumbler gear boxes by boring the cast iron to accept
sintered bronze bushings.

If you have steel bushings in there perhaps someone has modified it
before.

Delrin "AF" is more expensive than bronze FWIW.

Tony



"Dan " Dan@ wrote in message ...
I have a 16" South Bend Lathe with a Quick Change gearbox.
The steel bushings for the gear shafts in the gear box are worn badly.
Can I use Delrin to make the new bushings or will the material not
hold up?
I'm asking becasue I have Delrin available.
I can certainly use steel if need be.
Dan

On Nov 15, 7:29 pm, "Tony" wrote:
What type of gearbox is this, a single or double tumbler?

I'm not aware of steel bushings on Southbend gearboxes, but they do have
steel shafts running in holes bored in the cast iron. These are lubricated
by wick fed oilers.

I've rebuilt double tumbler gear boxes by boring the cast iron to accept
sintered bronze bushings.

If you have steel bushings in there perhaps someone has modified it before.

Delrin"AF" is more expensive than bronze FWIW.

Tony

"Dan " Dan@ wrote in ...
I have a 16" South Bend Lathe with a Quick Change gearbox.
The steel bushings for the gear shafts in the gear box are worn badly.
Can I useDelrinto make the new bushings or will the material not
hold up?
I'm asking becasue I haveDelrinavailable.
I can certainly use steel if need be.
Dan

That depends where you buy it, Dan.

I have an ebay store where we sell Delrin Offcuts - lot cheaper than
retail and a lot cheaper than bronze.

Check it out;

http://stores.ebay.ca/The-Great-Indu...eNameZl2QQtZkm

On Fri, 16 Nov 2007 22:03:59 -0500, "Tony" wrote:

on a Southbend single tumbler gear box, there are over 7 oil points, with
most of them having Gits oilers. Plus felt wicking to feed oil to internal
points. What shaft do you have that isn't getting oil?

The housing is cast iron, steel shafts run nicely in cast iron jornals. I
don't see any steel bushings in my gear box, or the exploded parts diagram
reference I have.

I have a parts breakdown that clearly shows the bushings. I'm not sure
of the exact names of the shafts. In the gearbox, there are two
shafts. One shaft has gears made up on the shaft and they only rotate
with the shaft. The other shaft has the gear in the center that shifts
from left to right. It is this shaft that has bushings on the ends on
the casing.
Look at this drawing. It's item #613

http://www.strippingknives.com/email...he-drawing.htm

Tony, you ask," What shaft isn't getting oil?" All of them! Some
person used this machine and didn't oil anything! I can't tell you how
much that ****es me off! I have a lot of worn parts that need to be
replaced simply because someone didn't take care of the machine.

As far as Delrin is concerned, I made some masthead sheaves for a
little sailboat I own and I have leftover material, so I thought I
could make some bushings.
Rest assured I will oil this machine with the proper oil. I have a
chart blown up on the wall right behind the machine that shows all the
oil points and what oil to use.

I disassembled the apron this weekend. The oil plopped out onto a
newspaper and it looked like a 4" diameter jet-black pancake full of
chips. I spent 6 hours cleaning out the apron housing with WD-40,
kerosene, and denatured alcohol.
Surprisingly, the internals are in pretty good condition. The worm
bushings are worn but everything else looks pretty good. The clutch
looks brand new.

So after I get a few needed parts, I'll make the rest of the parts I
need and I'll be running well. I bought it knowing it needed work so I
can't complain too much.

On Nov 18, 9:23 pm, Dan@ (Dan ) wrote:
On Fri, 16 Nov 2007 22:03:59 -0500, "Tony" wrote:
on a Southbend single tumbler gear box, there are over 7 oil points, with
most of them having Gits oilers. Plus felt wicking to feed oil to internal
points. What shaft do you have that isn't getting oil?

The housing is cast iron, steel shafts run nicely in cast iron jornals. I
don't see any steel bushings in my gear box, or the exploded parts diagram
reference I have.

I have a parts breakdown that clearly shows the bushings. I'm not sure
of the exact names of the shafts. In the gearbox, there are two
shafts. One shaft has gears made up on the shaft and they only rotate
with the shaft. The other shaft has the gear in the center that shifts
from left to right. It is this shaft that has bushings on the ends on
the casing.
Look at this drawing. It's item #613

http://www.strippingknives.com/email...he-drawing.htm

Tony, you ask," What shaft isn't getting oil?" All of them! Some
person used this machine and didn't oil anything! I can't tell you how
much that ****es me off! I have a lot of worn parts that need to be
replaced simply because someone didn't take care of the machine.

As far as Delrin is concerned, I made some masthead sheaves for a
little sailboat I own and I have leftover material, so I thought I
could make some bushings.
Rest assured I will oil this machine with the proper oil. I have a
chart blown up on the wall right behind the machine that shows all the
oil points and what oil to use.

I disassembled the apron this weekend. The oil plopped out onto a
newspaper and it looked like a 4" diameter jet-black pancake full of
chips. I spent 6 hours cleaning out the apron housing with WD-40,
kerosene, and denatured alcohol.
Surprisingly, the internals are in pretty good condition. The worm
bushings are worn but everything else looks pretty good. The clutch
looks brand new.

So after I get a few needed parts, I'll make the rest of the parts I
need and I'll be running well. I bought it knowing it needed work so I
can't complain too much.

Dan,

I know what you mean....I want to plant my foot in the butt of those
who I find abusing machinery by not lubricating it.

And thanks for making the effort to revive an old machine...I for one
appreciate anyone making the effort.

TMT

I see, the prior owner didn't oil anything. Yeah, that will mess things up
after awhile, but they really have to run it dry a long time :^(

I see on your chart the 16" single has a bushing, my 10" single tumbler
doesn't seem to have that. My 10" double tumblers of 1960's & 1980 vintage
seem to have bronze bushings, probably sintered bronze.

On my 16" x 10' of late '40's vintage, double tumbler, it had a messed up
gear box when I got it, shafts seized from lack of oil. I rebuilt it with
torrington needle bearings, hardened inner rings, and INA thrust bearings.
It should outlast several lifetimes even without proper lubrication.

Good luck on your rebuild

Tony



"Dan " Dan@ wrote in message ...
On Fri, 16 Nov 2007 22:03:59 -0500, "Tony" wrote:

on a Southbend single tumbler gear box, there are over 7 oil points, with
most of them having Gits oilers. Plus felt wicking to feed oil to internal
points. What shaft do you have that isn't getting oil?

The housing is cast iron, steel shafts run nicely in cast iron jornals. I
don't see any steel bushings in my gear box, or the exploded parts diagram
reference I have.

I have a parts breakdown that clearly shows the bushings. I'm not sure
of the exact names of the shafts. In the gearbox, there are two
shafts. One shaft has gears made up on the shaft and they only rotate
with the shaft. The other shaft has the gear in the center that shifts
from left to right. It is this shaft that has bushings on the ends on
the casing.
Look at this drawing. It's item #613

http://www.strippingknives.com/email...he-drawing.htm

Tony, you ask," What shaft isn't getting oil?" All of them! Some
person used this machine and didn't oil anything! I can't tell you how
much that ****es me off! I have a lot of worn parts that need to be
replaced simply because someone didn't take care of the machine.

As far as Delrin is concerned, I made some masthead sheaves for a
little sailboat I own and I have leftover material, so I thought I
could make some bushings.
Rest assured I will oil this machine with the proper oil. I have a
chart blown up on the wall right behind the machine that shows all the
oil points and what oil to use.

I disassembled the apron this weekend. The oil plopped out onto a
newspaper and it looked like a 4" diameter jet-black pancake full of
chips. I spent 6 hours cleaning out the apron housing with WD-40,
kerosene, and denatured alcohol.
Surprisingly, the internals are in pretty good condition. The worm
bushings are worn but everything else looks pretty good. The clutch
looks brand new.

So after I get a few needed parts, I'll make the rest of the parts I
need and I'll be running well. I bought it knowing it needed work so I
can't complain too much.