Logan 820: what is this knob's purpose?

tmenyc

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It's tailstock part LA263, called Knob, without descriptor. Under it is a closed-off vertical hole to fit the knob.
Thanks!
Tim
20190704_200406.jpg 20190704_195831.jpg
 

Ulma Doctor

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way back in the old days, there was a dauber in that position.
you would fill the cavity with read lead.
the red lead was used for lubrication purposes when working between centers.
you take a small dab of red lead and insert it into the center-drilled work ends, then place it between dead centers.
since we don't use many dead centers , the practice is fallen from favor
lead is carcinogenic, that too has been a reason for its demise
 

tmenyc

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REALLY interesting. Thanks so much for the explanation!

Tim
 

wa5cab

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What does the knob look like if you pull it out and look at the hidden end?

The Atlas machines of the period say to use white lead, which is a liquid or thin paste, with about the consistency of heavy cream. The widget that stores in a hole on the near-side top of the tailstock is called a dauber in the Atlas parts lists. I'm just curious as to whether what Logan called a knob is the original part that functions as what some other manufacturers called a dauber or just a hole plug because they weren't recommending white lead any longer but all of the tailstocks in inventory already had the hole.
 

HarryJM

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I saw a video where someone made a little metal box with a dowel on the side or bottom of it to fit in that hole so now they have a little open storage platform.
 

Nogoingback

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It's a dauber, which is what the Logan parts list calls it.
 

tmenyc

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My parts list just says "knob"! Now all I need to do is get some lead...

Tim
 

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Razzle

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Your lucky to have one. Most of them are gone. Mrpete222 on YouTube (tubelcain) suggests using cmd extreme pressure lube in the place of white lead. I found the cmd on Amazon for 10 bucks. It's a lifetime supply. You may be able to sell that piece on Ebay for 40 bucks ;-) I have never seen one in the wild before.


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tmenyc

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Interesting. I'll keep it.
Tim
 

wa5cab

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OK. So it is the dauber, even though called a knob.
 

tmenyc

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I'll put a little cmd extreme pressure lube in there just before i use dead centers. Back then, didnt they say "A little daub will do it!" ?

Tim
 

MrWhoopee

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When I studied machine shop in the late 70s, those things were still in place and filled with white lead on the school's WWII vintage lathes. The instructor had squirreled away a 5 gal pail of white lead after it was banned.
 

lordbeezer

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Ford motor company used to provide small container of white lead with replacement ring and pinion gear sets..in the 70's..have several somewhere..
 
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