Another 10" Logan Project + A Question

Probably a wise decision, and probably what I would have done.
 
Yep....If it's a lathe you plan on keeping, new bearings make a lot of sense. Scott provides a service that other manufacturers don't.
 
I think it's a keeper, and figured bearings are sort of important (!).
 
Not that it matters here but there is at least one other OEM who still supplies some parts for old US built machines - Clausing Corp - for both Atlas and Clausing lathes and mills.
 
Yes, I was able to buy a few parts from Clausing for my 6" Atlas. They do need the Atlas part numbers though if you call them.
 
DSCF7107_zpssaunckme.jpg

Removed the double row bearing from the spindle this evening. Scott Logan suggested using a punch and a hammer to loosen the nut, so that's what I did after soaking the threads
in Kroil for about a week. I don't like using brutal methods like that, but I couldn't think of a better way. The spindle was secured in the bench vise wrapped in a piece
of thick leather. After preliminary hits which accomplished nothing, a heat gun was used on the nut. That did the trick, and it came off easily. Supporting the cast bearing cap
and a few taps with a plastic hammer was all that was required to remove the bearing from the spindle. I left the bearing shield on the shaft: I believe they are no longer available and
didn't want to damage it.

The photo shows the parts after a preliminary clean up in the solvent tank. The bearing in the pic is the old one: after cleaning it with solvent it still feels rough, so
buying the new bearings was a good call. It's marked New Departure 5207 on one side, and Number 5507 on the other, which is the Logan p/n. The new bearings
are SKF's, and are marked as made in the USA. (The old bearing had a shield on one side but was open on the other: the new bearings are sealed on both sides.)
The nut that secures the bearing was a little mushroomed from banging' on it, so it was cleaned up on the belt sander. The
nut goes on one way: one side is undercut around the outer edge slightly so that the inner race bears on a shoulder.

The headstock casting has been into the tank as well. Threaded holes will be chased with a tap and it will go back in for a final cleaning. The other parts need cleaning as well, and then
hopefully assembly can begin fairly soon!

DSCF7107_zpssaunckme.jpg

DSCF7107_zpssaunckme.jpg

DSCF7107_zpssaunckme.jpg

DSCF7107_zpssaunckme.jpg
 
Last edited:
SPINDLE ASSEMBLY


Headstock assembly began with the first step: pressing the large spindle bearing onto the shaft. I decided to use a jury rigged drawbar made from all-thread
rather than hammering
it on. Plastic pipe was used over the spindle, which worked, but was probably not the best solution. A piece of steel pipe with properly squared off ends and some guide bushings
would probably have been better.

DSCF7108_zpsrhhliewi.jpg

After that the spindle went into the vise and the take up nut tightened by the punch/hammer method.

DSCF7109_zpsuj6sjmlt.jpg

Both bearings are pressed onto the spindle and are light press fits to the headstock. The bull gear key (LA-240) was installed next. One point to keep in mind for both disassembly
and assembly is that this key passes through a slot in the bearing cover (LA-134). If they aren't lined up properly, the key will damage the cover. The slot faces up.

The shaft was assembled next into the housing with bull gear, cone assembly, belt, and retaining collar (LA-131). The double row bearing was tapped into place until the large snap
ring on it's OD seated into the housing. I used a 4" diameter steel ring and a block of wood on the bearing cap to tap it in squarely. Very little force was required.
When I first tightened the three screws that secure the bearing cover there was a little binding in the bearing. I had carefully cleaned the recess in the headstock and the
face of the cap before assembly so it was a little puzzling. Changing the order that I
tightened the screws in and bringing them up gradually did the trick, and now the bearings
are perfectly smooth.

The rear bearing was pressed onto the aft end of the spindle by installing the retaining collar (LA-130-1) and placing a large socket over the end of the spindle before before
pressing it into place with the draw bar. It could be tapped into place with a hammer as long as the other end of the spindle was properly supported. After that the key for the
spindle gear, and the gear itself were installed and the take up nut at the end of the shaft tightened. The nut is really a collar with a hole drilled in it for a pin wrench.
I looked online and never found a wrench in inches that would fit, but it turns out a 40-42mm metric wrench (DIN 1810) works perfectly. I found
it online with no problem for about 13 bucks.

DSCF7113_zpsxortgckp.jpg

The only item left is to secure the bull gear to the shaft. It's keyed and secured with a set screw. I'm planning on emailing Scott Logan to ask about how much clearance there
should be between it and the cone assembly, unless one of you knows the answer. Then it's on to back gear assembly!

DSCF7112_zpsq5sj7dni.jpg

DSCF7108_zpsrhhliewi.jpg

DSCF7109_zpsuj6sjmlt.jpg

DSCF7113_zpsxortgckp.jpg

DSCF7112_zpsq5sj7dni.jpg

DSCF7108_zpsrhhliewi.jpg

DSCF7109_zpsuj6sjmlt.jpg

DSCF7113_zpsxortgckp.jpg

DSCF7112_zpsq5sj7dni.jpg

DSCF7108_zpsrhhliewi.jpg

DSCF7109_zpsuj6sjmlt.jpg

DSCF7113_zpsxortgckp.jpg

DSCF7112_zpsq5sj7dni.jpg

DSCF7108_zpsrhhliewi.jpg

DSCF7109_zpsuj6sjmlt.jpg

DSCF7113_zpsxortgckp.jpg

DSCF7112_zpsq5sj7dni.jpg

DSCF7108_zpsrhhliewi.jpg

DSCF7109_zpsuj6sjmlt.jpg

DSCF7113_zpsxortgckp.jpg

DSCF7112_zpsq5sj7dni.jpg
 
Last edited:
Nice write-up, good clear text and great pictures.
Thanks for sharing it!

....and best of all you remembered the belt! ;)

-brino
 
Nice write-up, good clear text and great pictures.
Thanks for sharing it!

....and best of all you remembered the belt! ;)

-brino
LOL.....I hate to admit that I've forgotten it....more than once. I never thought about a clearance spec for the bull gear. I know if it's too loose it will rattle .
 
Last edited:
Back
Top