Yttrium2
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Test Tube Holder
Again, I'm making a thread in regards to: How do I make a test tube holder,
the parameters; 1) There are 6 test tubes.
2) The holes are evenly spaces
3) There is a 1" margin on each side
Question: How mathematically can we determine how much space should go in between each hole?
Also
Question2: How could we determine the spacing that would need to take place to evenly space the tubes within a circle?
-- I have a top to a peanut butter jar that I figured I could use as a test tube holder. -- Not made out of gopher wood, or anything like that...
[Edited on 10/12/2018 by Yttrium2]
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Sulaiman
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Sketch the linear and circular test tube racks with letters to represent dimensions and the mathematics will follow.
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Yttrium2
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nevermind, their is an abacus beside me. I'll use it to see how many spokes there are and then from there deconstruct what they used to measure, and
how, mathematically, they found out how much distance to space the holes.
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Mr. Rogers
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You're overthinking this maybe. A drill press and a ruler is all you need to get the two haves as identical as they can be.
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Abromination
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I use a spot plate that happens to fit the diameter of my test tubes. It should fit most test tubes, it can be found on homesciencetools.com. It
should be the site's only plastic spot plate.
List of materials made by ScienceMadness.org users:
https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
--------------------------------
Elements Collected: H, Li, B, C, N, O, Mg, Al, Si, P, S, Fe, Ni, Cu, Zn, Ag, I, Au, Pb, Bi, Am
Last Acquired: B
Next: Na
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Elrik
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Quote: Originally posted by Mr. Rogers  | | You're overthinking this maybe. A drill press and a ruler is all you need to get the two haves as identical as they can be. |
As much as I believe in retaining a proficiency in trigonometry, I think Mr. Rogers is right. If your making a holder from cheap
materials then a ruler for rows or a printed picture of cyclohexane or cyclopentane to guide a circle is more than good enough. I made these two with
those methods and they came out fine, even if they do have a variance of ±1 mm 
If you want more complexity, just remember than your right triangles angle is Sin-1(opp/hyp) or Cos-1(adj/hyp) or
Tan-1(opp/adj)
Soh Cah Toa 
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DrP
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These are my 3 favourite test tube holders: https://st3.depositphotos.com/10654668/14428/i/1600/depositp...
Also up there as a quality holder: https://thumbs.dreamstime.com/z/young-woman-holding-test-tub...
\"It\'s a man\'s obligation to stick his boneration in a women\'s separation; this sort of penetration will increase the population of the younger
generation\" - Eric Cartman
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CharlieA
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Dr. P, Those are the best yet!
...but I think you have too much time on your hands!
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