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Old 02-11-2019, 05:56 PM
Mavaholic Mavaholic is offline
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Default Jack shaft material

I might have to up to a 1" shaft for my project. Which would better for jackshaft use, and why? Carbon Steel Grade 1045 or stainless steel. I do not know the grade of the stainless however its been sitting outside in the weeds for at least 5 years and it still looks brand new, if that helps.

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Old 02-11-2019, 06:34 PM
mckutzy mckutzy is offline
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Any carbon steel will do... That is cold finish... not mill... I made the JS on my bike from just a piece of that... Works great...
SS is overkill for this project... Use it if you want to, but it sounds like you have the tools to mill a keyway, id reckon it be used for other stuff you'll need later on the project...

What are you building???
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Old 02-11-2019, 07:36 PM
Mavaholic Mavaholic is offline
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Quote:
What are you building???
http://www.diygokarts.com/vb/showthread.php?t=40665

I do not have any means to cut keyways but I talked to the local machinist today and he will do it for $65 which is exactly what the 1045 shaft costs at Zero. Thats why I was wondering which would be better.
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Old 02-11-2019, 08:14 PM
mckutzy mckutzy is offline
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Well if thats a good price for you... then hey....
However.....It seems to me you might be able to get a whole 4-5' keyed shaft bar for about that or less from a number of sources and online...
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Old 02-11-2019, 08:52 PM
Mavaholic Mavaholic is offline
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Yes there are cheaper prices for weaker steels. You can get 1018 for half the price but less carbon means less strength. I just figured strength would be important. I'm kinda new at go karts and was hoping someone with some metallurgy knowledge would be able to give me some facts.
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Old 02-11-2019, 10:49 PM
mckutzy mckutzy is offline
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In the 1" size... I don't think 1045 or 1018 Is going to make a difference...
Mild steel is used in machines in factories all over... For your machine there's more likely a failure with a key itself or somewhere else in the drive line before the keyway gives out...
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Old 02-13-2019, 09:27 PM
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Quote:
Originally Posted by Mavaholic View Post
I do not know the grade of the stainless
That's reason enough not to use it behind a 60 or 70hp bike engine witha manual clutch and two back tires.

For $65 you can get a known quantity by buying a length of keyed shaft. I'd use chromoly myself and not have to worry about it.
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Old 02-14-2019, 01:25 PM
FoulMouth FoulMouth is offline
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For a very basic quick and dirty calculus of the strength, for a 1" shaft, you an multiply the yield strength of the material by 0.1. that will give you the available moment you can apply to a shaft in a simple cantilever type loading. your moment will be in in-lbs. Now you can divide the moment by the distance between your bearing support and the load point, Im assuming that will be the sprocket for a jack shaft. The value your left with is the # of lbs the shaft can support at that distance away from the support. I'm guessing the 1018 will be more than adequate.
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