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Unread 06-02-2017, 15:09
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Re: Thunderhex and Thunderhex Bearings

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Originally Posted by Jimmy Nichols View Post
Based on our experience last year, this year, and reading others. I think you need to use the Thunderhex bearings, always. You can always throw any hex you have on the lathe and turn it down or sand it down to the 13.75 or 13.73 mm you need.
Even on that front, you will often have trouble getting gears/pulleys to fit over hex purchased from a metal supplier. The tolerances just aren't very good and are often on the + side of 1/2" not minus.
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Unread 06-02-2017, 15:34
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Re: Thunderhex and Thunderhex Bearings

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Originally Posted by Cory View Post
Even on that front, you will often have trouble getting gears/pulleys to fit over hex purchased from a metal supplier. The tolerances just aren't very good and are often on the + side of 1/2" not minus.
On that note, do you have any supplies that you would recommend for hex 4140 steel? Haven't come up with a use for it yet, but it may be useful eventually.
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Unread 06-02-2017, 16:37
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Re: Thunderhex and Thunderhex Bearings

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Originally Posted by Cory View Post
Even on that front, you will often have trouble getting gears/pulleys to fit over hex purchased from a metal supplier. The tolerances just aren't very good and are often on the + side of 1/2" not minus.
We have had issues with aluminum hex from local metal suppliers being oversize, but steel hex seems to be usually undersized slightly (as much as standard Vex hex shaft is). I'm not sure if this is luck or just the way the steel is toleranced/manufactured.
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Unread 06-02-2017, 16:43
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Re: Thunderhex and Thunderhex Bearings

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Originally Posted by asid61 View Post
We have had issues with aluminum hex from local metal suppliers being oversize, but steel hex seems to be usually undersized slightly (as much as standard Vex hex shaft is). I'm not sure if this is luck or just the way the steel is toleranced/manufactured.
Interestingly enough, McMaster's hex rod seems to follow the same trend. The steel 1/2" hex seems toleranced to be slightly under .5", whereas the aluminum rods are around +/- .006.
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Unread 06-02-2017, 17:14
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Re: Thunderhex and Thunderhex Bearings

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Originally Posted by Monochron View Post
On that note, do you have any supplies that you would recommend for hex 4140 steel? Haven't come up with a use for it yet, but it may be useful eventually.
I've done this before.....Hex Key

Obviously machining it is annoying, but once it's done, you're probably set.

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Unread 06-02-2017, 17:40
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Re: Thunderhex and Thunderhex Bearings

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Originally Posted by Monochron View Post
On that note, do you have any supplies that you would recommend for hex 4140 steel? Haven't come up with a use for it yet, but it may be useful eventually.
I bought some 4140/4142 1/2" hex stock from McMaster (#6607k34) two years ago. I just measured out a ~1" long scrap piece at .4915-4925" flat to flat (nominal tolerance is +/- .007") on some cheap digital calipers. As you'd expect, the shaft fits into VEXPro gears easily, but with noticeable backlash.
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Unread 06-02-2017, 19:00
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Re: Thunderhex and Thunderhex Bearings

This thread reminds me of why I preferred round shaft prior to all the major FRC CoTS suppliers switching to hex.
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Unread 07-02-2017, 07:50
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Re: Thunderhex and Thunderhex Bearings

Turns out there was only 1 or 2 shafts that had deformed enough that the Thunderhex bearing would not go on.

Thanks for all the tips and tricks, a couple we knew, but a couple we didn't.
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Unread 07-02-2017, 08:49
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Re: Thunderhex and Thunderhex Bearings

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Originally Posted by Aren_Hill View Post
I've done this before.....Hex Key

Obviously machining it is annoying, but once it's done, you're probably set.

-Aren
We did this in 2014 for our catapult cam shaft, with good results.

-Mike
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Unread 07-02-2017, 09:23
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Re: Thunderhex and Thunderhex Bearings

I guess we got lucky. We bought an 8' length of the 1018 cold rolled hex from onlinemetals.com. It fit our bearings as well as any of our aluminum shafts. The ends were snug (presumably from shipment) but still looser than a press fit. Along the length of the shaft, the bearing slid freely.
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