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RE: [PSUBS-MAILIST] Lead Screw
Actually, I take that back, you could use (2) rods to
hold up the weight and use the chain/sprocket system
to drive it with no sag & it would work just as well,
I am just much more used to using the threaded rod
type system; just seems so much "cleaner" to me...
--- david cutajar <davecutajar@djcengineering.com>
wrote:
> From a "automation/machine designer/builder"
> perspective, I like the lead screw system. I would
> use
> a threaded rod parallel a shaft(or two depending on
> weight of object being moved)(for anti-rotate of the
> weight), cast the (lead) weight to any shape you
> want,
> add a bronze nut and bushing during the casting
> process.
>
> McMaster has coarse threaded stainless threaded
> rods.
> Get a multiple start thread for more speed if you
> want.
> You could load it up with lube & cover it with some
> bellows. Stainless may not even be required.
>
> I imagine it would be a very smooth operation,
> sturdy,
> precise, with a small direct drive motor all it
> would
> need would be a toggle switch for real nice control.
>
> The chain /sprocket will of course work too, but
> seems
> less professional and then you will have sag , or
> the
> weight will have to slide on something etc. noiser
> etc.
>
> I may be biased, because chain / sprocket motion
> regarded as "cheesy" for automation.
>
> just my $.02
>
> David Cutajar
>
> --- Hugo Marrero <hmarrero@hboi.edu> wrote:
> > 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
> > -----Original Message-----
> > From: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org]On
> > Behalf Of
> > DJACKSON99@aol.com
> > Sent: Thursday, May 27, 2004 1:07 PM
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] Lead Screw
> >
> >
> > 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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