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Re: Aluminium frame + Dremel = How many grams lost?

Posted: Mon Jan 30, 2017 2:36 pm
by audiojan
SABARRAS wrote:
audiojan wrote:If you're unlucky you can save 1135g. I wouldn't start chopping it up without understanding structural integrity.

Of course! There is a risk of messing up.
The welds on the frame look well done with generous fillets all round, they are actually quite smooth already, I 'm talking about removing the parts where there are imperfections and clearly excessive amounts of weld - not digging in too deep.
I've done a bit of research on weld smoothing and if done correctly, it can actually strengthen the frame by removing "stress raisers"
https://www.hera.org.nz/Story?Action=View&Story_id=1092
http://singletrackworld.com/forum/topic ... ooth-welds


This thinking is wrong in so many different ways... first, you're assuming the manufacturer did no stress relieving to start with, which is quietly likely not true. Second, you are assuming you can remove material to reduce stress, which again, is not true. Aluminum is a finicky material... done right it can be light and strong, done wrong and it can be light and very brittle... or heavy and brittle for that matter.

Leave your frame alone... if you want a lighter frame, buy one.

Re: Aluminium frame + Dremel = How many grams lost?

Posted: Mon Jan 30, 2017 2:54 pm
by cadence90
When I was a kid, I wanted to grow up to be a weight weenie.

Now that I'm grown up, I just want to be pragmatic and responsible.

I used to marvel at drilled chainrings, etc. The thought of drilling a frame never once crossed my mind. I think it is a completely crazy idea.

Re: Aluminium frame + Dremel = How many grams lost?

Posted: Mon Jan 30, 2017 7:53 pm
by SABARRAS
OK, my idea of enlarging the "vent holes" in the head tube is a definite no-no!

http://ridemonkey.bikemag.com/threads/e ... es.105466/

Re: Aluminium frame + Dremel = How many grams lost?

Posted: Mon Jan 30, 2017 8:13 pm
by mike
do nothing to the frame. keep it as a trainer/travel bike or bad weather bike. you will regret it once you start cutting holes into your frame.

Re: Aluminium frame + Dremel = How many grams lost?

Posted: Mon Jan 30, 2017 8:51 pm
by victorduraace
Dont do it, needless to say, you will void the warranty.

Re: Aluminium frame + Dremel = How many grams lost?

Posted: Mon Jan 30, 2017 9:05 pm
by kulivontot
I love how you guys are so concerned about the resale and warranty of a $400 no-name frame. Wreck your frame all you want, just don't sue us for telling you do it.
And when you've given up, PM me, I've got a 52cm NOS 2011 Scott Addict frame I'll sell you.

Re: Aluminium frame + Dremel = How many grams lost?

Posted: Mon Jan 30, 2017 9:46 pm
by TheKaiser
If it currently has a thick enamel paint job you can save 100g+ by stripping it. Get it anodized rather than repainting it to save the most weight. I'm not quite sure what an average powder coat weighs, but that could be a middle road.

That'll save you a lot more weight than any dremeling. If you were curious to answer your original question you could measure the wall thickness and surface area of the zones you wanted to dremel and sand and get a (very) rough estimate of the total weight loss potential, but I'd say do the paint and call it good.

I've seen pics of Cannondale "smooth welds" being sanded down with a belt sander so I don't know that you were totally off base in your supposition that it could be done safely, but probably just not worth the time/effort.

Re: Aluminium frame + Dremel = How many grams lost?

Posted: Wed Feb 01, 2017 4:36 pm
by eric01
Ahh brings back memories of "drillium". I heard a couple horror stories of drilling frames too aggressively and some serious accidents. But that was pre internet so all just stories.

I once took a drill to the underside of a plastic saddle when I was a kid. But that's as far as I went.

Re: Aluminium frame + Dremel = How many grams lost?

Posted: Wed Feb 01, 2017 4:42 pm
by darnellrm
kulivontot wrote:And when you've given up, PM me, I've got a 52cm NOS 2011 Scott Addict frame I'll sell you.


Buy the Addict!! Miles ahead weigh-wise and they are GREAT frames!! If it is an HMX carbon frames, it should be well under 800g from the factory.