PDA

View Full Version : Lathe testing



Tin Falcon
08-27-2005, 06:18 AM
Here is an link to an article from july 1955 model engineer
http://www.wrathall.com/Interests/machining/Testing%20lathe%20for%20accuracy.pdf
Couldcome in handy for those with old iron or those looking to buy a used lathe.
jim

Forrest Addy
08-27-2005, 10:01 AM
This is good as far as it goes but don't EVER use that limber indicator set-up to dial in the tailstock quill. There is so much sag in the drill chuck and that collection fo indicator hardware that it's almost certain to show the tailstock as 0.002" high.

Someone posted a photo that showed a piece of pipe in a 4 jaw chuck, The pipe was long enough to span the carriage and present to indicator to the quill with noting more than a short stub of round stock welded to the end of the pipe as an attachment point. There is always deflection from gravity in a horizontal axis of rotation but this photo shows how to minimize it.

Would whoever posted the photo I referred to speak up? Was it you, Matt?