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vtsteam:
But If the spindle bearings and bed are worn enough, then making the spindle parallel with the bed is easy:
 Don't do anything!  :lol:

(Joking, but if wear is signifigant than there is no meaning to the words "making them parallel". )

David is presenting a hypothetical case of an assumed straight bed and unworn spindle, for fun consderation here, I think.

Fergus OMore:

--- Quote from: vtsteam on March 16, 2015, 09:21:01 AM ---David is presenting a hypothetical case of an assumed straight bed and unworn spindle, for fun consderation here, I think.

--- End quote ---

It's all to do with hides- flat or otherwise. The squaw on the hippotamus hide is equal the son of the squaws of the opposite two hides. Easy as Pi.  :smart:
Norman

vtsteam:
We had pizza and cherry pie to celebrate, Norman, you?

ps. don't forget deflection of the test bar due to clock spring if you're into micron lathes

pps. do you use an air bearing traveling steady on a micron lathe? questions, questions......

Fergus OMore:
Gave my wife the Book of Pi which was about a guy with a  tiger on a lifeboat. Very confusing!

But I got utterly confused with Holzapffel- the lathe guy who was actually using hippo hide to flatten metal. Seriously, I'm not joking. Then he sold an ornamental turning lathe to the Tsar of Russia and you know the problems Putiin it into today's topics. A sort of Crime here or was there?

I had a really fun. It was how the Planet Venus was used to do the Megalithic Yard and it's almost the Vernal Equinox on which to do the calculations. Look it up- Prof Thom and  Knight and Lomas- University of Bradford

I'm not the only one :bang: :bang: :bang:

Norman

Sorry I wrote Hall and Knight- wrong =Knight wrote my School Algebra book

N

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

steampunkpete:

--- Quote ---(Joking, but if wear is signifigant than there is no meaning to the words "making them parallel". )

David is presenting a hypothetical case of an assumed straight bed and unworn spindle, for fun consderation here, I think
--- End quote ---

I think that Mr. VTSteam is quite right again, and if you think about it, we aren't trying to align the spindle axis with the bed of the lathe, we are trying to align it parallel to the locus of some point on the saddle, so there is no real reason why we shouldn't move the saddle.


--- Quote ---The first thing is to assume that moving the saddle is the first step to a quick way to a Moonbeam from a Lesser Lunacy.
--- End quote ---

I'm not certain what is intended by this, and I would welcome an explanation as it might help me to understand.

I'm not sure why there is a consensus on using a chuck rather than a collet. My experience is that collets are more accurate (although they can't be adjusted in the same way as an independent jaw chuck) so what is the advantage of starting the job with a chuck?

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