[TowerTalk] Hole Alignments

[Marty Tippin]

Charles- 

Unless geometry has changed recently, I don't think this is really what
you meant - perhaps instead of "diameter" you mean "circumference" (the
distance *around* the circle, not across it) - in that case, measuring
the circumference and dividing it in half would certainly give you two
points at opposite sides of the tube.  However, accurately measuring the
circumference and then accurately finding half of it would still be a
real challenge, especially up on a tower (that 3/4" OD tube has a
circumference of  2.356194490192").  

-Marty KI0LO 
 martyt@pobox.com

> -----Original Message-----
> From:	Charles H. Harpole [SMTP:harpole@pegasus.cc.ucf.edu]
> Sent:	Monday, May 18, 1998 10:08 AM
> To:	W9SN
> Subject:	Re: [TowerTalk] Hole Alignments
> 
> Drilling both sides of tube:
> Measure the total diameter of the tube.
> on a piece of paper, mark two points--one point at random and the
> other
> point, mark it from the first, exactly half of the diameter of the
> tube.
> That gives you two points on the paper, separated by the distance of
> the
> radius of the tube.
> Wrap the paper around the tube.
> Place one of the points at the intended hole location. Mark it. 
> Holding the paper steady, mark the other point on the other side of
> the
> tube.
> Drill both points from the OUTSIDE of the tube.  
> Very cheap and easy, even up on a tower.
> de K4VUD
> 

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