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Old Mar 26, 2012, 01:34 PM
Registered User
United States, FL, Tampa
Joined Nov 2009
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I need a little help finding some hardware, for a piston tank.

I am looking for some parts to make a micro syringe piston tank using a BBQ injector. But the issue I am having is finding a gear that is threaded on the inside to lift my nylon threaded bar. Could some of you suggest somewhere where I could find some stuff like that? Or at least what its called.

similar to this set up.
Mini RC submarine ballast tank test 2 (0 min 27 sec)


Trying to get my supplies together to convert an academy 1/150 boat. And I figured I could just stick a radio in it and link the control surfaces and dynamically dive it... but whats the fun in not challenging yourself

Thanks ahead of time
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Last edited by asd9000; Mar 26, 2012 at 01:40 PM.
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Old Mar 26, 2012, 06:03 PM
RC sub dude
CaptainNemo12's Avatar
Montreal, Quebec, CANADA
Joined Nov 2004
301 Posts
How about using a metal nut that will fit your threaded rod and embedding the nut inside a plastic gear?
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Old Mar 26, 2012, 07:14 PM
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United States, ME, Bar Harbor
Joined Sep 2005
392 Posts
Stock Drive Products www.sdp-si.com has a vast array of gears ect. that should help.
Also try calling Precision Scale Model Engineering( the web site does not show the catalog)
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Old Mar 27, 2012, 01:39 AM
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United States, FL, Tampa
Joined Nov 2009
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Quote:
How about using a metal nut that will fit your threaded rod and embedding the nut inside a plastic gear?
That's what I plan on doing if I cannot find anything else. And does metal on nylon offer better results? Just curious that statement made me wonder :P

Thanks for the help so far!
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Old Mar 27, 2012, 06:53 PM
Man from Atlantis
Sub culture's Avatar
London
Joined Nov 2003
883 Posts
Looks to me like he has just drilled and tapped the main gear with a thread. Usually piston tanks use a metal spindle and spigot. For a small tank like this, you can get away with plastic.
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Old Mar 28, 2012, 05:24 AM
TheyreComingToTakeMeAway!
derk's Avatar
USA, ID, Coeur D'Alene
Joined Dec 2003
5,406 Posts
best bet is to drill and tap, otherwise its a huge pain to get the nut centered on the gear properly.
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Old Apr 03, 2012, 07:49 AM
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Louisiana
Joined Sep 2006
1,193 Posts
This may be a crazy idea, but how about scavenging parts from a screw type deodorant? I took one apart the other day and it looks like the parts are similar to what you’re looking for. That is if you looking for a DIY solution.
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Old Apr 04, 2012, 11:33 PM
Registered User
United States, FL, Tampa
Joined Nov 2009
165 Posts
hmm I ll look at one I like the idea! thx for the suggestion. I built a prototype but its belt drive... aka rubberband. and I need gears now. I just bored out and tapped a gear. Used a bearing to hold it in place and a brass screw.
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Old May 01, 2012, 09:55 PM
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Waukesha, WI
Joined Dec 2006
242 Posts
another source for threaded plastic rod

Parmesan cheese with built in grater also has a nice mechanism.
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