Logan spindle bearings

Logan spindle bearings

Post by Paul Watt » Fri, 18 Sep 1998 04:00:00



I have a Logan 935-2.  I just replaced the spindle bearings and I'm not
sure how much preload to put on them.  Problem is there is about .090
space between the inner race of the rear bearing and the shoulder it
bottoms out on the spindle.  All the spacers and parts are in place.
There are bellville washers on the outer race but it just doesn't seem
like a "ball" bearing would be able to take that kind of load, if I
pulled the bearing tight on the spindle.  Am I missing something?
Anyone else rebuilt their Logan's?  

TIA for any help!

Paul Watts

 
 
 

Logan spindle bearings

Post by Scott S. Log » Fri, 18 Sep 1998 04:00:00




Quote:
>I have a Logan 935-2.  I just replaced the spindle bearings and I'm not
>sure how much preload to put on them.  Problem is there is about .090
>space between the inner race of the rear bearing and the shoulder it
>bottoms out on the spindle.  All the spacer"s and parts are in place.
>There are bellville washers on the outer race but it just doesn't seem
>like a "ball" bearing would be able to take that kind of load, if I
>pulled the bearing tight on the spindle.  Am I missing something?
>Anyone else rebuilt their Logan's?  

>TIA for any help!

Frank Graham did.  See:

http://www.metalworking.com/dropbox/Logan.txt
http://www.metalworking.com/dropbox/Logan2.jpg
http://www.metalworking.com/dropbox/Logan2.txt
http://www.metalworking.com/dropbox/Logan2a.jpg
http://www.metalworking.com/dropbox/Logan2b.jpg
http://www.metalworking.com/dropbox/Logan2c.jpg
http://www.metalworking.com/dropbox/LoganB4.jpg
http://www.metalworking.com/dropbox/LoganB4a.jpg

and

http://www.loganact.com/part_sht/headstock/la-1000-1.htm

My guess (assuming you got the right bearings, and since you did not
get them from me, I have no way of knowing) is that you are missing
the LA-1015 spacer and/or the Belleville Washers (LA-1016) are
installed incorrectly.  They should be installed like this:

  \/ \/
  || ||
  || ||
  /\ /\   (use a monospaced font to see that properly)

There are a total of 4 Bellevilles.

The Take-Up Nut (LA-1019) should be tightened up until it is solid.

  +--------------------------------------------+
  |    Scott Logan -  ssl "at"loganact.com     |
  | Logan Actuator Co. http://www.loganact.com |
  |                Chicago, IL                 |
  |++++++++++++++++++++++++++++++++++++++++++++|
  | Parts and Accessories for Logan Lathes and |
  |          Montgomery Wards Lathes           |
  | Logan-Lilly Mine Hoist Safety Controllers  |
  +--------------------------------------------+
            "Measure Twice, Cut Once"

        RCM FAQ - http://w3.uwyo.edu/~metal
 Metal Web News - http://www.mindspring.com/~wgray1/
Help squash SPAM: http://www.cauce.org/


 
 
 

Logan spindle bearings

Post by Fitch R. Willia » Sat, 19 Sep 1998 04:00:00



Quote:
>Frank Graham did.  See:

>http://www.metalworking.com/dropbox/Logan.txt
>http://www.metalworking.com/dropbox/Logan2.jpg

And a remarkably nice job he did too.

Fitch
In So. Cal.

The FAQ (Frequently Asked Questions) for rec.crafts.metalworking
is at http://w3.uwyo.edu/~metal.  

The companion web page for rec.crafts.metalworking is the
Metal Web News at http://www.mindspring.com/~wgray1/      

The "Drop Box" for metalworking related pictures and binary files
is at http://www.metalworking.com/

 
 
 

Logan spindle bearings

Post by Frank Graha » Sat, 19 Sep 1998 04:00:00


Quote:
-----Original Message-----

Newsgroups: rec.crafts.metalworking
Date: Wednesday, September 16, 1998 8:14 PM
Subject: Logan spindle bearings

>I have a Logan 935-2.  I just replaced the spindle bearings and I'm not
>sure how much preload to put on them.  Problem is there is about .090
>space between the inner race of the rear bearing and the shoulder it
>bottoms out on the spindle.  All the spacers and parts are in place.
>There are bellville washers on the outer race but it just doesn't seem
>like a "ball" bearing would be able to take that kind of load, if I
>pulled the bearing tight on the spindle.  Am I missing something?
>Anyone else rebuilt their Logan's?
>TIA for any help!
>Paul Watts
When I rebuilt my 820, The spindle is located in the headstock by the
circlip on the front bearing and the end cap. Once all spacers are in place
I simply ran up the take up nut until snug ( I didn't have a torque spec for
this nut), there was no pre-load as such. The original 820 headstock did not
use a bellville washer at all, but the later cabinet drive casting that I
switched to did, just under the end cap ( note: the difference is in the end
cap itself, the early end cap will not accept the bellville washer). The
bellville washer is there to reduce chatter not to create a preload on the
bearing as I understand it. I don't know if your lathe is the same but when
the retaining collar is slid on the spindle the rear bearing bottoms out on
this. I'm not sure where you see this .090" gap. The spacer between the rear
bearing and the cone pinion gear on the spindle can slide about .050" but
this has no relation to any end float of the spindle.
Regards,
______________________
Frank

______________________

 
 
 

Logan spindle bearings

Post by Paul Watt » Mon, 21 Sep 1998 04:00:00


Thanks Frank.  I also got an email from Scott about my lathe also.  I
wasn't aware that so many parts were still available for my lathe.  The
lathe is up and running and I've been using it all weekend.  Tweaked the
tailstock and leveled it and now, it's dead on.  The three jaw needs to
go and I'll probably pop for a better tool post.  I was able to happen
up on this lathe by accident.  The guy was buying a new lathe and needed
the room.  It didn't sell as quick as he thought and the drop date of
the new lathe came on him so fast, he told me if I came and got it I
could have it.  Problem was it was 14hrs one way.  Oh well, I won't bore
you any more.

Again thanks, you and Scott!!

Paul Watts