Steam & Excursion > ORHC - turntable pivot placement

2/3/2033 Photos compliments of Dale Birkholz.    Pivot being flown into postion.  Pivot is within 1/8" of center mark.  Omega Morgan did the move, Everett Engineering was on site to verify.  

MANY thanks to Dale for permission to post his, as usual, excellent photos.    Arlen    (to an earlier question, yes, the forklift is out of the pit)

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Great photos Arlen.
Question, what with all of toady's "modern technology", can't they get that center pivot closer than 1/8 of an inch?

no ideas Jack....way beyond my training/knowledge.   

Can't relie on those toadies, can we? Thanks Arlen.

I suggested a string stretched from corner to corner would place the center pivot exactly.  But my idea was dismissed.
Blaine
American Fork

1/8" is not that important..
Thermal expansion/contraction ( daily temperature cycles)  over
the length of a 110ft turntable, makes 1/8"  off-center an insignificant dimension...
Let's be more realistic, here.

A hundred degrees in the summer sun means a greater dimensional concern...
IMHO..

If it's too long in the summer heat, the remedy is easy !
​
W.

( " Corner-to-corner".... in a circle?  )



Edited 2 time(s). Last edit at 02/05/23 17:43 by wcamp1472.

Where the three location pieces grouted in place after the alignment was assured?

ST2k

Might not want to do the 'grouting'....at this early stage....
until after all the components are placed, tested, adjusted and finalized.

Saves having to bust-up the too-soon grout to accommodate the final 
adjustments ..

Dont get the cart, before the horse.

​W

An 1/8" is pretty darn precise on something like this.  Wish my house had been built that precisely.  It's been fun to watch and learn as the project has progressed.

Nathan

What we're talking  about is the 'tolerance space'..
Its as if you picture a dot of light, 1/8" in diameter.

The actual, pin-pont, imaginary center of the bearing assembly,
is 'within' that 1/8" circle....it might, in fact, be exactly in the center;
but, our measuring device 'certainty', is 'within 1/8" --- so the MOST 
off-center it could be is 1/8",--- and could be way-less, and might
in fact.  be 'zero'.

Stating the possible 'variance-of-certainty' ---- does not mean that it is, 
in fact, 'off-center'...  It might be 'dead-on' center & within that little 1/8" 'dot'...

​W.
 

Are the ocean's sea levels really level ?

LocoPilot750 Wrote:
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> Are the ocean's sea levels really level ?

Well I agree some what the way this went into space never fear TO commenters over do thiings.

Sea levels?

The oceans’ local surfaces are technically segments of a spherical shape….so, you can say they are curved, as seen from space..

“Sea level” refers to the varying height of ocean water on the shore line.

“Level” can be an adverb regarding
degree of tilt of an object, or virtually
NO tilt.

W.

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