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Re: [TowerTalk] U-bolts for holes with 1 and 7/8 centers

Subject: Re: [TowerTalk] U-bolts for holes with 1 and 7/8 centers
Date: Mon, 13 Jun 2011 06:37:09 EDT
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William, I recently had a similar problem; needing some ubolts for 2  3/8" 
outside diameter pipe.
No standard sizes were available. The next smaller size was expanded to fit 
 by whaming the center of the ubolt with a hammer. This caused the legs to 
spread  apart and no longer parallel. The legs were reformed to correct 
geometry by  placing them over a smaller piece of scrap pipe and squeezing them 
together in a  vice.
It actually took less time than writing about it here. And best of  all, 
they fit just fine.
Your 70cm yagi was designed to fit a 1 5/8" support mast. Many, if not  
most, cross yagis are used with a Yaesu or Kenpro elevation rotator. Both  
theses rotators are made to accept a 1 5/8" through boom.
I will check my ubolt collection later today; I had some stainless steel 1  
5/8" size at one time, may still have some.
Gerald K5GW
In a message dated 6/12/2011 11:32:39 P.M. Central Daylight Time, writes:


An otherwise very good 70cm yagi has a boom and  clamp plate with 
pre-drilled quarter-inch holes:  their _centers_ are  1 and 7/8 inches 
apart.  The correct u-bolt was missing.

Don't  ask how how many places (including McMaster) and how long I've 
looked for  a u-bolt with centers of its [ends] 1 and 7/8 inches 
apart.  I've  learned there are about a half-dozen common u-bolt 
sizes, and for that  dimension none come close.

Help will be appreciated.  Bolt stock  section 3/16 inch should be 
good; 1/4 inch would be very  tight.

Best regards,
William W3QX



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