Re: [PSUBS-MAILIST] Lead Screw

[Warren Greenway <opensourcesub@yahoo.com>]

Hey folks, they have lead screws that consist of a
smooth stainless steel rod and a couple of spring
loaded ballbearings in a "nut assembly". I have seen
these in action and they work great. I'm not sure 
where to get them, honestly, but I saw a guy make a 
set of them for a robot project before. You spin the
rod and the nut assembly moves down the rod. Maybe 
a little research on the internet will bring up some 
info.

Warren.

--- DJACKSON99@aol.com wrote:
> 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
> Brian
> 
> 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
> www.submarineboat.com
> 



	
		
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