I'm replacing the spindle bearings on a mill I'm converting
from CNC back to manual, a Millport. I have two sets of
bearings collected from ebay, a set of Timkin and a set of
Barden bearings. Is there any real difference between the
two? I know they are both excellent names, but if there's
one better than the other, I'd like to keep it for my manual
Bridgeport.

Now, I got a small container of grease for the bearings.
Would like to know the proper procedure for greasing and
running in of the new bearings. Mill is a step pulley with a
2 speed motor and goes up to 5400rpm. I am pretty darn sure
I don't want to be running it full tilt right off the bat!

Anyone?

Thanks,

Jon

(and if anyone remembers, yes this is the mill I intended to
replace a couple years ago when I bought that Frankenmill
from Putterman on ebay. It's 'alive' again! Got a noisy head
I have to dig into, but otherwise it's living up to
expectations)

"Jon Anderson" wrote in message
. ..
I'm replacing the spindle bearings on a mill I'm converting from CNC back
to manual, a Millport. I have two sets of bearings collected from ebay, a
set of Timkin and a set of Barden bearings. Is there any real difference
between the two? I know they are both excellent names, but if there's one
better than the other, I'd like to keep it for my manual Bridgeport.

Now, I got a small container of grease for the bearings. Would like to
know the proper procedure for greasing and running in of the new bearings.
Mill is a step pulley with a 2 speed motor and goes up to 5400rpm. I am
pretty darn sure I don't want to be running it full tilt right off the
bat!

Anyone?

Thanks,

Jon

(and if anyone remembers, yes this is the mill I intended to replace a
couple years ago when I bought that Frankenmill from Putterman on ebay.
It's 'alive' again! Got a noisy head I have to dig into, but otherwise
it's living up to expectations)
I may be wrong but my understanding of Bridgeport spindle bearings is that
some later ones were sealed and the rest were open. The open bearings are
lubricated by oil which works down through the felt washer from the oil cup
on the top of the head. I do not think any manual Bridgeport spindle
bearings are supposed to be greased.

Don Young

On 2008-06-17, Don Young wrote:

"Jon Anderson" wrote in message
. ..
I'm replacing the spindle bearings on a mill I'm converting from CNC back
to manual, a Millport. I have two sets of bearings collected from ebay, a
set of Timkin and a set of Barden bearings. Is there any real difference
between the two? I know they are both excellent names, but if there's one
better than the other, I'd like to keep it for my manual Bridgeport.

Now, I got a small container of grease for the bearings. Would like to
know the proper procedure for greasing and running in of the new bearings.
Mill is a step pulley with a 2 speed motor and goes up to 5400rpm. I am
pretty darn sure I don't want to be running it full tilt right off the
bat!

Anyone?

Thanks,

Jon

(and if anyone remembers, yes this is the mill I intended to replace a
couple years ago when I bought that Frankenmill from Putterman on ebay.
It's 'alive' again! Got a noisy head I have to dig into, but otherwise
it's living up to expectations)
I may be wrong but my understanding of Bridgeport spindle bearings is that
some later ones were sealed and the rest were open. The open bearings are
lubricated by oil which works down through the felt washer from the oil cup
on the top of the head. I do not think any manual Bridgeport spindle
bearings are supposed to be greased.

They arew supposed to be oiled with spindle oil. (!)
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I didn't quite state something right. I got a small
container of grease -with- the bearings, thus my assumption
that they were to be greased for initial lubrication. I know
they are not to be packed like wheel bearings, but I thought
a small amount was needed initially.

Gunner?


Jon

Jon Anderson wrote:

I didn't quite state something right. I got a small
container of grease -with- the bearings, thus my assumption
that they were to be greased for initial lubrication. I know
they are not to be packed like wheel bearings, but I thought
a small amount was needed initially.


I can't tell you how much grease to put in it but you DO NOT pack it full. These are not
wheel bearings. Too much grease on a high speed bearing can cause overheating. I know,
it seems counter intuitive but trust me on this. Checking with the bearing manufacturer
is a good plan. Kluber NBU-15

Here is a note I have in my palm.



Spindle Bearing Grease Kluber

Actually I doubt there is any lube system at all, per-se, for the spindle
bearings proper.

Generically speaking, your grease is applied only at assembly, and "for
life", and it generally fills 1/3 of the total space between the balls at
the fill stage.

The Kluber nbu-15 will usually be the standard grease, ( expensive, yet
highly recommended)--and this grease is generally servicable up to 13k rpm
on 30 taper and to 10k rpm with 40 taper milling spindles, and it is rated
as being compatible with most any reputable bearing manufacturer's angular
contact class 7/ 9 spec's.

http://www.kluberna.com/


HTH,
Wes