Pratt and Whitney Model C 16/30

[johnoder]

Sometime during its 20 plus years here, this 12 X 30 had its ratio box off to fix a sheared key - so I know that gear box comes off.
It left here in 2005

(this is from 1950, so the bare beginnings of the "squareish" head Model C - ass opposed to the "slope head" originals)

Bye Bye Sweet P&W

Got her cleaned up Kevin's cool dollies Headed toward the door Kevin tieing down Bye bye you great little machine. You did good for the twenty years I had you. John

www.practicalmachinist.com

good little lathe

 

[binzer]

That is a sad post from many years ago John. Heavy little lathes for sure! lol

 

[binzer]

After doing some research today on a couple model b lathes, I can now understand what this dog tooth looks like. It was tough to see clearly in the parts listing. Added the first two pics from another post. link below.

Single Tooth Clutch repair on Pratt Whitney 12 x 30 model B

I'm sorry, I don't quite follow your descriptions, but are you saying you have a part that you know is removable, but you left it on in order to use it as part of your puller? Any chance it hides a fastener or other feature that would prevent removal of the entire assembly? allan

www.practicalmachinist.com

So now when I turn the drive rod I can feel the dog tooth in reverse and not in forward. Although when I help the detent out (attached pic in red circle) and keep firm pressure on the clutch, I can feel the dog tooth in forward - mind you I think I can feel some rounded edges. Is it possible this wear is actually caused by the detent spring wearing out over time and not holding the correct pressure allowing it to slip back?

I am going to remove the detent and change the spring to something stronger and see how that does, but I still think tearing down the ratio box to get to that forward dog tooth is the right thing to do. Even if I can reform some square edges on it at the least.