Needle Valve Knob Improvement - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 10-24-2010, 06:39 PM Thread Starter
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Needle Valve Knob Improvement

After using a certain brand of needle valves for a few months, I came up with an idea for an improvement that I wish the manufacturer would have thought to implement. Notice that the brass control knob is very smooth, which makes it look great. However, having the surface roughness extremely low makes it difficult for the user to make small adjustments, especially if his or her hands are damp from doing tank maintenance. To fix this problem, I made an aluminum knob that slips over the stock one with a set screw(not visible in picture) to secure it to the existing one. The knob I made, on my metal lathe, has a knurled finish, which allows the user to easier get a grip on the knob to make small adjustments. In order to keep cost down and still provide the intended function, aluminum was used instead of brass.
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post #2 of 6 (permalink) Old 10-24-2010, 08:35 PM
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Nice work.


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post #3 of 6 (permalink) Old 10-24-2010, 09:07 PM
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Real nice. I bet you can sell a few of those. One thing that might be good to do is, drill a dimple in the original knob for the set screw to set into. Otherwise, the new knob can spin on the old knob if there is no dimple and the set screw works loose.
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post #4 of 6 (permalink) Old 10-25-2010, 01:16 AM Thread Starter
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Quote:
Originally Posted by hbosman View Post
Real nice. I bet you can sell a few of those. One thing that might be good to do is, drill a dimple in the original knob for the set screw to set into. Otherwise, the new knob can spin on the old knob if there is no dimple and the set screw works loose.
The knob I made actually fits pretty snug on the old knob. I actually wasn't even going to put a set screw in at first. I will keep an eye on it and will resort to doing this if need be. If I can get a hold of some 'cheap' brass, I will make one using it.
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post #5 of 6 (permalink) Old 10-25-2010, 02:19 AM
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I would also like to point out that the larger the diameter of the knob the finer grained control you have over the needle valve. Nice workmanship. But a larger diameter would be nice add...

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post #6 of 6 (permalink) Old 10-25-2010, 12:13 PM Thread Starter
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I would also like to point out that the larger the diameter of the knob the finer grained control you have over the needle valve. Nice workmanship. But a larger diameter would be nice add...

Sent from my DROIDX
Lowes only carries 3/8" aluminum round bar, which was the limiting factor for the first one. The knob I made almost doubles the radius of the stock knob. I may have to order some aluminum or brass of Ebay or hit up a local scrap yard for the next attempt. Thanks for the tip!
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