Mounting needed

I've recently purchased a telescope - well, a heavy brass sight from a field
gun. Deprived of its usual flange, it is just a heavy, awkward lump of a
thing & I'd like to mount it on a tripod that I already have to hand.
I need someone to make up a mounting ring for me - not especially complex,
just bigger than I can swing. You can see photos of it here
formatting link

along with a rough line drawing of the proposed mounting.
Made in polished brass or bronze, the mounting ring needs to be nominally 3"
long and a clearance fit on the 3.5" of the OD of the barrel. A sturdy block
of the same material - with which to fit it to the tripod - has a large
knurled screw fitting (size to be measured) and is silver soldered or brazed
to the mounting ring. Finally, two smaller knurled turnscrews are fitted to
two bushings at 90o to each other below the mounting ring.
If anyone is interested in running this up for me, drinking vouchers will
naturally be available - please reply off list.
Regards,
J. Kim Siddorn,
Reply to
Kim Siddorn
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It looks like a nice piece Kim but I would be careful about using clamp screws to hold it. The point loading could easily dent the scope walls unless they're really thick. Then they'd just scratch the nice brass. Have you considered a split ring?
John
Reply to
John
The wall is 1/8" thick, so will take a little pressure! The unit is massive, probably weighing forty-fifty pounds. I imagine that it is intended that the concussion of the gun would not affect the focus.
That said, a nicely carried out clamping ring would be even better, I was looking at the easiest option.
Regards,
Kim
"John" wrote in message >>
Reply to
Kim Siddorn
Is it? Ouch. I need to rethink this then .............76
Regards,
J. Kim Siddorn, Regia Anglorum
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Reply to
Kim Siddorn
2 or possibly more jubilee clips to hold the scope onto the angle, plus the important bit, an old inner tube to protect that nice brass scope tube from damage.
It should be simple to contrapt a nice mounting by welding a nut on the outside of the angle iron to match the standard screw of a heavy duty camera tripod.
Reply to
crn
wrote
Eek, I was joking - this ain't scrap heap challenge you know!
BTW Kim, how did "its usual flange" fit?
Nick H.
Reply to
Nick H
See if you can find a 3" brass gate valve. Something like this.
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the innards removed and bored out, the main body should do nicely. A shower mixer valve body may also be about the right size.
John
Reply to
John
Thanks to all who contributed to this thread and for the useful thoughts & suggestions. I've now found a model engineer with a bit of brass pipe of an appropriate size amongst his souvenirs and he has agreed to make up the bracket for me. It might even be ready when I come back from my travels ;o))
Regards,
J. Kim Siddorn,
Reply to
Kim Siddorn
Why do you need 6" length?
I'd lost-foam cast a tin bronze ring (more flexible than brass), then do it with the boring head on the mill. The outside could be filed and polished, my casting finish is good enough for that. A boss could be cast onto the side to machine up for a clamping screw.
If you need 6" spacing, make tow rings and a spacer.
Reply to
Andy Dingley

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