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rockrat
10-08-2005, 09:10 AM
Well, the sickness has spread to family members. Dad is now the new owner of a Logan model 1875 built about 1960: 10” swing x 24 center to center.

I'm all excited for him. But there is a question that he has asked me and I dont know without getting down there to look at the lathe.

The back gear on this lathe is engaged by a push pull handle on the left of the machine. Once the back gear is in, the lathe does not want to turn.

How is this back gear set up? Is there a planetary gear in there? Anyone with a photo or a drawing of an exploded view?

I seem to remember South Bend had a bolt that needed to be removed when the backgear was in. But then again, it was a while ago that I worked on that machine. I may have forgotten.

Thanks rock-

[This message has been edited by rockrat (edited 10-08-2005).]

franco
10-08-2005, 09:29 AM
I'm not familiar with Logans, but somewhere on the headstock pulley there will be either a locking pin or sliding catch which will allow the direct drive from the pulley to the headstock spindle to be disengaged when the backgear is in use. My lathe has a pin with a knurled head in the chuck end of the headstock pulley which is pulled out towards the tailstock to unlock the direct drive.

franco

Fred White
10-08-2005, 10:44 AM
Franco is probably right. There is a handwheel on the outboard end of the spindle.
There should be a knob device you have to pull out on that handwheel....if you don't the spindle is locked up ( convenient for assisting in chuck removal ).

John Lawson
10-08-2005, 12:22 PM
Lathe off. Put your finger on the exposed face of the bull gear and turn spindle by hand. Finger will encounter a knob. Pull knob out to disengage bull gear from spindle. Now pull lever to engage back gears.
To re-couple direct drive, push in on knob as you rotate spindle till it clicks in.
Use a screwdriver or special bifurcated wrench to pop out a stubborn locking knob.

sauer38h
10-08-2005, 01:01 PM
Drawing of a 200 (very similar lathe)-
http://bridgeport.askmisterscience.com/belt.htm#hs1b
Pull part #345 to the right.

And a photo -
http://bridgeport.askmisterscience.com/345.jpg

[This message has been edited by sauer38h (edited 10-08-2005).]

[This message has been edited by sauer38h (edited 10-08-2005).]

Maker
10-08-2005, 05:16 PM
Maybe this picture will help.
http://img.photobucket.com/albums/v668/makerofcoolthings/LoganHeadstock.jpg
It's of my Logan 1917 which is very similar.
You can see the backgear lever engaged, and the pin in the bull gear in the out position.

Alex

rockrat
10-08-2005, 11:08 PM
Well, there it is. I thought that I remembered seeing something on a pin or bolt there.

Thanks all.