help with combo machine spindle bearings

help with combo machine spindle bearings

Post by Terry Nelso » Tue, 23 Feb 1999 04:00:00



Quote:

> I have a Harbor Freight "3-In-One Combo Machine" (lathe/mill) almost 5
> years old with very few hours on it. The lathe spindle, always noisy,
> sounded AWFUL when I ran it today, so I tore it down for a look.  UGH!
> The grease had dried into something hard and yellow and the spindle
> was difficult to turn and 'crunchy'.  I removed the spindle and rear
> bearing and washed all in kerosene.  The front bearing is a tapered
> roller, the rear is a caged ball, totally open.  It had copious
> quantities of cast iron powder (?) in it, along with that solidified
> ear-wax.  Now that they are clean (and the rear one doesn't seem TOO
> bad, considering what it's been through), I am ready to grease 'em up
> and reassemble.  My question (which may start another 'way-lube war')
> is "should I pack the bearings with wheel-bearing grease, lubricate
> them with way-lube, lubricate them with hypoid gear lube, throw them
> out and by sealed replacements (perhaps more than I can afford or the
> machine is worth), or some other option?".  I was surprised to find

Make sure they are REALLY clean, then you can problably use wheel
bearing
grease I think.  If you use oil you need to oil them every time you
use the machine.  I think gear lube will also run off.  A sealed bearing
would be nice for the one, I don't think you can find a sealed tapered
bearing.  Bearings also aren't always that expensive.  I put new
bearings in my gearhead, two roller bearings plus 6 to 8 regular
bearings for just $70 recently.  I wouldn't get to worried about not
having tapered bearings in the rear.  Regular ball bearing can take
much more thrust than most people realize.  Some lathes use ball
bearings for both and do just fine.

Terry

- Show quoted text -

Quote:
> that the rear bearing was NOT a tapered roller, although it takes
> considerable thrust (the two bearings are squeezed toward each other
> by a threaded nut that pulls the spindle through the rear bearing).
> *I* would have built it differently ;-)

> Thanks, Dave

> ps.  That ball bearing is not symmetrical (the race wall is a little
> thicker on one side), but I've pretty much decided to install it so
> that the pressure will be on the smoothest running side (probably
> backwards).

 
 
 

help with combo machine spindle bearings

Post by David E. Clo » Wed, 24 Feb 1999 04:00:00


I have a Harbor Freight "3-In-One Combo Machine" (lathe/mill) almost 5
years old with very few hours on it. The lathe spindle, always noisy,
sounded AWFUL when I ran it today, so I tore it down for a look.  UGH!
The grease had dried into something hard and yellow and the spindle
was difficult to turn and 'crunchy'.  I removed the spindle and rear
bearing and washed all in kerosene.  The front bearing is a tapered
roller, the rear is a caged ball, totally open.  It had copious
quantities of cast iron powder (?) in it, along with that solidified
ear-wax.  Now that they are clean (and the rear one doesn't seem TOO
bad, considering what it's been through), I am ready to grease 'em up
and reassemble.  My question (which may start another 'way-lube war')
is "should I pack the bearings with wheel-bearing grease, lubricate
them with way-lube, lubricate them with hypoid gear lube, throw them
out and by sealed replacements (perhaps more than I can afford or the
machine is worth), or some other option?".  I was surprised to find
that the rear bearing was NOT a tapered roller, although it takes
considerable thrust (the two bearings are squeezed toward each other
by a threaded nut that pulls the spindle through the rear bearing).
*I* would have built it differently ;-)

Thanks, Dave

ps.  That ball bearing is not symmetrical (the race wall is a little
thicker on one side), but I've pretty much decided to install it so
that the pressure will be on the smoothest running side (probably
backwards).

 
 
 

help with combo machine spindle bearings

Post by Gilles Jalber » Wed, 24 Feb 1999 04:00:00


I'm not familiar with the lathe/mill in question but it sounds like your
rear bearing is an angular contact bearing and not just a plain deep groove
ball bearing. If this is the case, I don't think that reversing the bearing
will work. Part of its job is to apply some preload into the tapered roller
bearing at the front. If the bearing is rough, I'd go for a replacement.
As far as the lubrication goes, filling the bearing cavity approximately 1/3
with a good quality grease always works for me.

still lurking
Gilles