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Damaged(?) Stem

Old 03-14-14, 08:40 AM
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Earl Grey
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Damaged(?) Stem

I have a brand new Dimension alloy stem, and I've noticed that it looks like the new guy/girl was working the drill press. By the top left hole (in the photo, top right from the rider's perspective) there is an extra conical hole that is obviously from the tip of drill bit. There's actually another tiny 'hesitation mark' to the right, so I guess it took three attempts to hit the spot!

I might not be bothered about this, except that this hole is close enough to the edge of the material that it's actually eaten a little nibble out of the surface:

I'm concerned that this nibble will be a stress riser in a spot that sees quite a lot of load and, obviously, the stem / handlebar interface is safety-critical. But I'm not a metallurgist / engineer.

I'm inclined to return it. Is this paranoia?
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Old 03-14-14, 08:52 AM
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I don't think it's much of a structural problem, but that still doesn't make it acceptable in a new product. Return it for replacement; you'll be glad you did.
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Old 03-14-14, 09:06 AM
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It would work , but why not return it ? if more than 1 are like that ,


If not a Blem, it may function as a locating pin detent for the logo printing step..




maybe bump up the investment to a more premium brand , if you want.

Dimension is a low cost line. skipping individual QC does save money ..

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Old 03-14-14, 10:04 AM
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Thanks, John and Bob. I contacted the vendor (Modern Bike) who have no problem exchanging it.

And agreed on the low-cost line. That is actually my plan - go cheap to fine tune the stem length on my new build and then switch out with something a little better made (bars and seatpost are Nitto).
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Old 03-14-14, 10:05 AM
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That's where they balanced it
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Old 03-14-14, 10:50 AM
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Originally Posted by spdracr39 View Post
That's where they balanced it
you are right!

when i took my MGA engine to Weathie's Machine Shop for balancing/blueprinting back in '71 all the connecting rods came back like that.
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Old 03-14-14, 11:18 AM
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Originally Posted by JohnDThompson View Post
I don't think it's much of a structural problem, but that still doesn't make it acceptable in a new product. Return it for replacement; you'll be glad you did.
+1, If you had it for a while before noticing it, I'd say don't worry because it doesn't make a difference. But if delivered new, than you can return it since you paid with 1st class dough and are entitled to 1st class product, not a second.
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Old 03-14-14, 01:58 PM
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Thanks, FB. It's boxed up now.
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Old 03-28-14, 09:53 AM
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So, got the replacement today... ...exactly the same (different enough that I know it's not the same stem, but same problem - if anything, a bigger "nibble" out of the surface this time).

I am thinking this really is an artifact of Dimension's manufacturing process. Still don't like it, and notching the surface (especially) seems poor. But the part will become a 'spare' as soon as I'm sure I've got the length dialed in, so I guess I'll live.
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Old 03-28-14, 09:58 AM
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Another unrelated comment - couldn't find this thread in my 'Recent Started Threads' list, or any of my posts in it in my 'Recent Posts' list, or by searching on 'Dimension'... ...are some of the forum features known to be unreliable?
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Old 03-28-14, 11:04 AM
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Originally Posted by Earl Grey View Post
Another unrelated comment - couldn't find this thread in my 'Recent Started Threads' list, or any of my posts in it in my 'Recent Posts' list, or by searching on 'Dimension'... ...are some of the forum features known to be unreliable?
interesting manufacturing anomaly, anyway, about the Search function.

i've found i.. th.. ..pas. ... .. .th.t. som..ti.. ... sorr... you... ar.. ..reakin... ..p.
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Old 03-28-14, 01:47 PM
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Thanks Huey! Not sure how I would have managed without your contributions to this thread.
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Old 03-28-14, 02:51 PM
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That's where they balanced
the port and polish heads come on the high performance model.
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