[TowerTalk] Mast slippage

[john at kk9a.com]

The bracket's hole size was never mentioned in the VE3NNT's post.  I thought it was odd that he was going up a size so I questioned if 3/8 will fit.

John KK9A  

-----Original Message-----
From: Jon Pearl - W4ABC [mailto:jonpearl at tampabay.rr.com] 
Sent: Friday, July 31, 2020 5:21 PM
To: john at kk9a.com; towertalk at contesting.com
Subject: Re: [TowerTalk] Mast slippage

Hi John,


3/8" is a tad fat for the M8 hole.

5/16" = .3125" and will drop in a M8/.3149" hole

3/8" = .3750" and will drop in a M10/.3937" hole



73,

Jon Pearl - W4ABC



On 7/31/2020 12:36 PM, john at kk9a.com wrote:
> Will 3/8 bolts fit into a plate designed for M8?  I believe that 
> stainless steel bolts are typically not much stronger than grade 2. 
> Grade 8 bolts are available with Armor Coat which has great corrosion 
> protection.
>
> John KK9A
>
>
> Les Brown VE3NNT wrote:
>
> Thanks for all the advice guys. I think I'll start with replacing the 
> SS M8 bolts with 3/8 inch grade 8 bolts (or grade 9 or 10?) to see if 
> that solves the problem. If it doesn't, I'll have to try the K7NV 
> clamp, but that will require me to remove the rotor to slip the clamp 
> on to the bottom of the mast, which won't be so easy. Given that half 
> the mast is sticking out of the top of the tower, I'll have to rig up 
> some pipes to hold the bottom of the mast in place for the operation.
>    It sounds like drilling and pinning isn't a good solution, and not 
> so easy to do.
> 73, Les VE3NNT
>

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