I welded a 5" long 3" IPS sch40 pipe (3.042" id) stub to a 3/8" HRS
steel plate about 6" square, and welded 8 HD 1/2-13 nuts over holes for
grub screws to the mast. The other side of the plate has a 2" IPS sch
40 pipe stub welded to it that fits into the Big-Rak. I had it hot dip
galvanized, so the plate had a 1.5" diameter hole in the center for the
Zn to flow thru. I had to tap the 1/2-13 nuts after galvanizing.
Painting would probably work fine, I had a bunch of stuff going to the
galvanizer.
I mounted hoist rings on two corners of the 3/8 plate so I could hoist
the mast/beam (about 500#) clear of the BigRak for when it needs removed
for service.
Grant KZ1W
On 3/11/2015 6:56 PM, Rich Hallman - N7TR wrote:
Anyone using or know if or how to use an AlfaSpid Big-Rak with a 3 inch mast?
Thanks...
Rich N7TR
ex KI3V, N3AMK, WB3JOV
www.n7tr.com<http://www.n7tr.com>
http://www.qrz.com/db/N7TR
Telnet: dxc.n7tr.com N7TR DXCluster
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