On 11/8/2011 2:22 AM, Jim Thomson wrote:
> Date: Tue, 8 Nov 2011 00:46:02 -0000
> From:<john@kk9a.com>
> Subject: Re: [TowerTalk] Pinning mast?
>
> You didn't say what kind of mast clamp you are using. While pinning a mast
> is good thing in many cases, I think you need to correct the fit of the mast
> clamp before going any further. My prop pitch has a 3" K7NV mast clamp and
> my mast is 2 7/8 diameter so I purchased as 3" diameter stainless steel tube
> with a 1/16 wall and made a shim out of it. The clamp then tightened to the
> mast securely. Why won't yours shim properly?
What about building, or purchasing a mast clamp that mounts on a flat
plate and is adjustable for centering, much like the mast clamps used in
the PST- series...of ProSistel rotators?
73
Roger (K8RI)
>
> John KK9A
>
> ## kurt has detailed instructions on how to pin a mast correctly.
>
>
> http://k7nv.com/notebook/id9.htm "pinning masts"
>
> http://www.k7nv.com/proppitch/ Scroll down to see the
> infamous K7NV mast clamps for PP rotors. I have the
> small PP with the 2" mast clamp + mating GH control box.
>
> http://www.k7nv.com/proppitch/id35.htm this is his 2"/3" mast
> clamps...but for an OR-2800 rotor.
>
> I'm sure he can make his mast clamps in any size you want...like to
> handle a 2.875" mast for example. What type of mast clamp do you have
> on the PP right now ?? If you are using a 3" mast clamp and the mast is
> 2.875"
> you can shim it with just about anything, like a short piece
> of 3" irrigation tubing [.050" wall]. just slit it down one side..[or a
> 2nd slit
> 180 deg opposite]
>
> You can also wrap the lower end of the mast with that heavy duty non skid
> stuff, used for
> stairs. It come's in 1"-2"-3" width's..and on long rolls, and sells by
> the foot.
> Sticky back on one side and like sandpaper on the other side. It won't
> budge.
> You can also use it on inside of the mast clamp. Ok, now you have two
> sandpaper
> surfaces butted up, touching each other. It won't budge. Waterproof too.
> You can also use it on one / both sides of any shim.
>
> I used that same non skid stuff on my HB mast steps which are made of 2" x 2"
> x 1/4"
> thick 6061-T6 angle Al. [14" long each]. I applied it to both the
> horizontal and vertical
> portions, so my hands + feet won't slip.
>
> Kurt's PP mast clamp and his OR-2800 mast clamps are the.....'real deal'.
> You barely
> tighten them, and it pinch's the mast so tight, it's not gonna slip,
> ultimate mast clamp..
> albeit expensive, but I don't have time for bs mast clamps these days. Do
> it wrong
> and you just have to end up doing it right the 2nd time anyway. Cheaper to
> do it
> right the 1st tine around. He use's transverse gr -8 bolts on his mast
> clamps. The mast
> justs slides into his mast clamps, snug fit. With No bolts and just some
> vice grips pinching
> his clamp, it still won't budge ! His clamps work simply cuz they have a
> massive, huge surface
> area. The tips of the teeth on an OR-2800 mast clamp don't compare,
> miniscule surface area.
>
> later... Jim VE7RF
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|