Hugo,
I was thinking of making a comment which involved Gumby's side kick Pokey
but I think I'll pass on that one !
Brian
----- Original Message -----
Sent: Thursday, May 27, 2004 10:57
AM
Subject: RE: [PSUBS-MAILIST] Lead
Screw
Brian,
Also for submerged hardware, you can use
aqualube (a.k.a. Gumby Cum). This stuff is pretty good, you can actually have
a bolt submerged underwater for over a year and still will be ok.
Hugo
In a message dated 5/27/2004 11:04:39 AM Central Daylight Time,
ojaibees@ojai.net writes:
Doug, can I get a stainless screw that is not a real
fine thread? I think the fine thread could have a tendency to get stiff
from debris
Yes, if you google for "lead screw" or "ball screw" you'll find all
types. www.mcmaster.com stocks
several varieties too. But if your planning on using it in a wet
environment I'm not sure a lead screw is your best solution. I
don't think it would take much sand to jam up any lead screw. The ones
I have seen are always well lubricated and shielded when in unclean
environments. I have never seen one used submerged. They do
allow you to finely position a load, but being within 1/32" is not that
important right? Someone suggested chain, and that is what I plan to
use too. The chain runs a loop from the drive sprocket to an
idler sprocket and back. I purchased some used stainless steel roller
chain of eBay for a song. But instead of relying only on the chain for
the weight, you can use it to move a lead weight. The down side
is safety. If a lead screw drive fails the weight is less likely to
move, but if a chain breaks then both the weight and the chain are
going to head down hill. If anyone has experience with using "lead
screws" in ocean like environments it would be helpful to hear your
thoughts.
Thanks
Doug Jackson
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