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Old 07-23-2007, 10:38 AM   #1
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Default Machinists...opinions?

Why undercut the hexes on these wheels?

All my RC4WD wheels are cut like this, not sure why.


There's tons of these out there and I haven't heard of hex issues so they must be strong enough.
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Old 07-23-2007, 10:42 AM   #2
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I have one that has a cracked hex, it has been that way for a while. Not because of that though. I have been trying to break them, no luck so far!
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Old 07-23-2007, 04:03 PM   #3
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I think it's because of the manufacturing process of roughing out the hex on a lathe with a hole/counterbore. Then the hexes are formed to the finished shape/size with a broach. The undercut gives the broached chips a chance to break when the tool bottoms out. That's my guess anyway.
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Old 07-23-2007, 04:43 PM   #4
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Yes I'd agree with Bender. The hexes are broached you can see tool marks in the hex. I don't see any issue with it.
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Old 07-23-2007, 08:31 PM   #5
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Quote:
Originally Posted by Rockpiledriver View Post
Yes I'd agree with Bender. The hexes are broached you can see tool marks in the hex. I don't see any issue with it.
X3.Definitely done with a broach.
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Old 07-23-2007, 11:00 PM   #6
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Thanks guys. Just wanted to understand why they're built the way they are.

I've cut hexes on my manual mill and rotary table but I always drilled the "corners" then milled from point to point.

Never had the fancy stuff at my disposal.
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