Case Hardened Shaft = Fail - HeliFreak
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Old 09-06-2010, 10:34 PM   #1 (permalink)
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Default Case Hardened Shaft = Fail

Well ... I even took pictures and was going to write a tutorial for you all. The only problem is that my results are inconclusive.

I thought I could take two shafts .. use one as a control and the other as my experiment. For the test, I took a known weight and dropped it onto a fulcrum sitting on the shaft from a set height - I increased the weight each drop until it bent the shaft.

The result ended up being that the control was stronger than the hardened shaft.

I am suspecting, this could be the 'quality' issues with the shafts that everyone is experiencing. Some shafts are good ... some are bad .... I think the quality of the alloy being used is varied.

In the end, the test was really inconclusive. To test the effectiveness of the hardening, the same shaft will need to be tested before and after the hardening.
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Old 09-07-2010, 12:20 AM   #2 (permalink)
 

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The alloy of the shafts are not consistent enough to harden. This is why procrasher uses his own billet and builds them from scratch.
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Old 09-07-2010, 09:12 AM   #3 (permalink)
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I see that now. :o

I'm going to see what I can find out there to manufacture my own shafts. If I can get the price down.

I'll let you all know...$15 seems expensive for something so simple. I can understand the premium on the front tail gear from Wolf...
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Old 09-07-2010, 09:38 AM   #4 (permalink)
 

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Really all you need is a pretty accurate press and some tool steel rod (2 mm). punch out the holes, clip the ends then do your case hardening... I wouldn't under estimate procrashes work though - he did some pretty good NDT testing IMHO regarding just how much his shaft could hold (I think is was around 2KG) and I think he has some good knowledge of metalurgy and so one... also remember the pin holes should be tapered.....

Now the feathershafts.... that is a whole other story. Imagine drilling and taping those ends! I would use 2mm rod - then lathe down a head on one end to 1.7mm (the head diamter of the feathering screw and slot it for a driver. Then drill and tap the other end for the stock screw.... at least this way you could drill and tap before turning it down and have the extra meat there and only have one chance to screw (pardon the pun) screw it up. Then of course harden them.

(Man I wish I had a shop again!)
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Old 09-07-2010, 11:59 AM   #5 (permalink)
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Yah, I have a shop at my disposal, just not at my house.... the shop is in the city, and I am too lazy to drive the 30 minutes into the city.

I'm not too concerned about feathering shafts. I prefer them on the soft side so they protect the other parts.
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Old 09-07-2010, 09:46 PM   #6 (permalink)
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Maybe try cutting one (used) shaft in half and harden one half then do the same tests on each half.
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Old 09-07-2010, 10:09 PM   #7 (permalink)
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If my shaft won't get hard, the last thing I would want to do is cut it in half! I'd try Viagra or Cialis first, if rubbing doesn't work.
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Old 09-07-2010, 10:21 PM   #8 (permalink)
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Lol I knew one of those that was coming sooner or later.
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Old 09-08-2010, 12:10 AM   #9 (permalink)
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