[TowerTalk] Small mast design - comments?

[jimlux]

On 11/11/20 2:51 PM, john at kk9a.com wrote:
> Correct , there is a lot of tolerance on extruded tubing and it will likely
> require machining to fit together.
> 
> John KK9A
> 
> Ron Gorski ron-n9au wrote:
> 
> No. The 1-1/4 inner tube will not necessarily fit inside the 1-1/2 in tube
> because of nominal manufacturing tolerances.
> Ron N9AU


You might look at the variety of clamps used in theatrical work 
(Cheseboro is one brand) that are used to clamp pipes together. There's 
nothing that says your mast has to be in a straight line - you could 
overlap two by a foot with a couple clamps.

an example: 
https://www.gripsupport.com/post/2017/06/20/new-cheseboro-clamp-design

http://www.clampsunlimited.net/
https://www.mutualhardware.com/


a couple of swivels is one way
http://www.premier-lighting.com/shop/product1239.html
but would be a bit expensive.



Also Pipe Sleeves (designed to join two pipes end to end)


most scaffolding and grip equipment places have a wide variety of this 
kind of stuff.




> 
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Ross
> Tucker
> Sent: Wednesday, November 11, 2020 5:51 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Small mast design - comments?
> 
> OK, I just submitted an RFQ to Industrial Metal Supply for the following:
> Two 12' lengths of 6061 Aluminum tube, 1-1/2" outer diameter, 1/8" wall
> thickness.
> One 6' length of 6061 Aluminum tube, 1-1/4" outer diameter, 1/4" wall
> thickness.
> 
> The thick inner tube will be placed inside the joint and pinned. We will use
> drive-on steps at the very bottom, a mast bracket at the 2' level, and a
> "guy" holding the two masts together over the roofline of the RVs.
> 
> Does this sound reasonable? Any additional tips or suggestions before I buy
> the materials would be appreciated. Thanks for the help you've already
> provided. :-)
> 
> Ross, NS7F
> 
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>