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Author Topic: Is there a mathermatologist in the house?  (Read 1569 times)

Offline Geezer

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Is there a mathermatologist in the house?
« on: 08/01/2011 06:55:34 »
We never really answered this one. It should be simple enough for those skilled in the "Ars Mathematica"

http://www.thenakedscientists.com/forum/index.php?topic=34689.0


 

Offline JP

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Is there a mathermatologist in the house?
« Reply #1 on: 08/01/2011 16:24:59 »
I tried to solve this last week.  However, I accidentally divided by zero on my handheld calculator...

When I came to, I was in a field surrounded by 5000 dead red-winged blackbirds.

Not sure I want to try that again.
 

Offline Geezer

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Is there a mathermatologist in the house?
« Reply #2 on: 08/01/2011 19:40:19 »
I was having a similar problem with wild turkeys, so I fixed it by removing the zero button from my calculator. I figured if the Romans (ancient Italians?) didn't need a zero, neither did I.
 

Offline CliffordK

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Is there a mathermatologist in the house?
« Reply #3 on: 09/01/2011 02:58:18 »
If you want "precise" gear changes...

Buy your self  a 100/127 gear set.

There are 2.54 cm/inch.  So...  2x127 = 254, and it should be pretty easy to calculate the necessary gearing (I can't find notes on the exact precision of the conversion).

Otherwise there are tables...  somewhere...  that you can get within a percent or so of Metric threads with English threads which would mean your threads would be a little tight or loose depending on how you cut them.

My lathe... unfortunately was built during WWII...  And the US Government must have decided that it was only intended to last a couple of years and forgot to add any bushings!!!
 

Offline Geezer

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Is there a mathermatologist in the house?
« Reply #4 on: 09/01/2011 03:34:28 »
Buy your self  a 100/127 gear set.
Quite so Clifford. I pointed that out in the other thread, but as I also pointed out, I'm too cheap to buy one  :D

You may have missed this too -

"Anyway, according to my calculations, using my single additional gear I can cut a one millimeter pitch thread with an error of less than 0.0005 mm per pitch. That's less than 0.5 mm per meter, which is probably good enough for most of the things I do, except manufacturing leadscrews of course."

That ain't too shabby, and it's a lot better than a couple of percent.

I'm sure you also realize by now that I would not have posted the question unless I thought it was going to keep people awake at night ;D

So, how many teeth do you think there are on the gear I made?

(I really did make one BTW. I can't really post a piccy yet as it would tend to give the game away.)

 

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Is there a mathermatologist in the house?
« Reply #4 on: 09/01/2011 03:34:28 »

 

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