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Old 08-02-08, 10:26 PM   #1
fatigoworld
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CNC machined handlebars?

so i guess im VERY late on the CNC phase in bikes as it seems most of these components are form the 90's. but i really eat this stuff up. im building a road/city bike and already have some CNC MTB components on it (precision billet derailleur, thomson seatpost/stem, paul thumbies, bullseye levers) but does anyone know if theres such thing as CNC machined riser bars?



ps. i have no valid reason for wanting this other than knowing that it is exactly what i want.
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Old 08-03-08, 12:18 PM   #2
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I don't think there would be. I am going to assume based off of my knowledge of CNC machines that it would be near impossible to hollow out the bars. So any kind of CNCed bar would be solid and HEAVY. But yeah I've never seen or heard of them either.
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Old 08-03-08, 01:03 PM   #3
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I think the closest anyone got to that sort of thing was welding handlebar tubes to a cnc stem. This has since been replaced with CF or Al/CF - see below.

One piece bar/stem combos seem to have stuck with the roadie/tt/tri crowd. The mtb/offroad/FRDH/cx crowd didn't take it up in any great numbers after the intial flurry of interest (probably early '90s).
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Old 08-03-08, 01:24 PM   #4
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I am a CNC lover, but can't think of any CNC bars. Carbon is the new CNC nowadays.
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Old 08-03-08, 01:47 PM   #5
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They'd be able to hollow out partway on the ends. They'd be heavy. They'd also be really, really expensive.
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Old 08-03-08, 02:32 PM   #6
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solid handle bars...
heavy.
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Old 08-03-08, 10:00 PM   #7
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I think Answer made some billet Pro-Taper MX bars at one time. Trouble would be finding shims to fit it to an MTB stem.
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Old 08-03-08, 10:22 PM   #8
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I think Answer made some billet Pro-Taper MX bars at one time. Trouble would be finding shims to fit it to an MTB stem.
Wheels Mfg. makes a shim that would work, but again, using a bar that's tank heavy just to say you've got a CNC made bar?

Eh, whatever floats his boat I guess.
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Old 08-04-08, 02:45 PM   #9
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well i didnt know it would be a "tank". i thought thomson stems and setposts were CNC machined, and theyre hollowed out and light.....
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Old 08-04-08, 02:59 PM   #10
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well i didnt know it would be a "tank". i thought thomson stems and setposts were CNC machined, and theyre hollowed out and light.....
Yes. A fairly simple shape. Now picture a 24-28" bar, with rise. How is the CNC machine going to do the internal cutting past those bends of the rise and sweep, when the OD/ID it would have to work with is that narrow?

That said, I don't know enough about CNC to say unequivically that it couldn't be done, though I'm very, very doubtul it could be. A solid billet CNC into one, with the straighter parts of the ends of the bars could be bored out, but the thing would still be damn expensive and very pretty heavy, IMO.
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Old 08-04-08, 03:03 PM   #11
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Thats because the stems and seatposts are straight.
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Old 08-04-08, 03:21 PM   #12
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...seatposts are straight.





You're right though - simple shape and shallow bend is easier to machine.
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Old 08-04-08, 04:02 PM   #13
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Well, the slight bend is do-able.
Like a tunnel digging machine, it can do slight bends in the earth, it just cant do a drastic turn.
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Old 08-04-08, 04:23 PM   #14
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. . . it just cant do a drastic turn.
Like this?

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Old 08-04-08, 05:56 PM   #15
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I'd imagine that would be stretching it for a CNC machined post.
Unless of course they are just talking about the brackets...
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Old 08-04-08, 09:34 PM   #16
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Well, what if they weren't round? Or only round on the grip area. More of a gusseted or beam type milling.
seems like that could look pretty tough.
something along these lines...

http://bp0.blogger.com/_6s3mYCY5QCE/...107_351638.jpg
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Old 08-04-08, 09:57 PM   #17
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Well, what if they weren't round? Or only round on the grip area. More of a gusseted or beam type milling.
seems like that could look pretty tough.
something along these lines...

http://bp0.blogger.com/_6s3mYCY5QCE/...107_351638.jpg
Sure, if you want a bar that is still going to likely be heavier than normal, and still cost more money.

A CNC handlebar is a solution in serach of a problem that doesn't exist.
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Old 08-07-08, 01:16 AM   #18
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how bout a flat bar then? actually markhr now has me thinking about the bar stem combos. anyone know of any CNC'd bar/stem combos? doesnt have to be entirely CNC'd, just enough to have that pretty look....
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Old 08-07-08, 01:51 AM   #19
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CNC'ing a part that is subject to repeated flexing just doesn't make much sense. Better to use a technique that is fast and ensures an even, strong product than a technique that comparatively slow and can result in a weaker surface and unseen stress risers.

The 'pretty look' you refer to is what I'd call the 'fashion victim' look. You can get lots of CNC'd stems (Thomson being the obvious candidate). But reports of cracked faceplates (and discovering one myself) has thoroughly turned me CNC'd stems, let alone a more flexible part like a handlebar. Something like a seatpost is probably fine (Thomsons have a great rep there), but seatposts don't flex as much as handlebars.
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Old 08-07-08, 04:04 AM   #20
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how bout a flat bar then? actually markhr now has me thinking about the bar stem combos. anyone know of any CNC'd bar/stem combos? doesnt have to be entirely CNC'd, just enough to have that pretty look....
Ebay for something like that I think. If you want new then you're probably limited, for mountain bikes, to CF.

random example

Scott Pilot

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Old 08-07-08, 10:36 AM   #21
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something like that scott pilot, but aluminum.....would be perfect! i am using this for a road/street bike actually, i just frequently use MTB parts for durability and style....
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Old 08-07-08, 10:44 AM   #22
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If all you're after is style, why not get a set of these:



or these?

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Old 08-07-08, 10:53 AM   #23
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sorry, but those arent my "style". thanks for the insinuation that thats all i care about though! especially since i paired the word with "durability". and i doubt your bike is ENTIRELY functional without an ounce of aesthetic value to you......

i love my bike, it rides like butter and needs little to no maintenece. also i love having parts on it that i am attached to, for whatever reason. and i am frankly tired of having to defend aesthetic value, im sure everyone on here has their own tastes whether they realize it or not....

and it aint no show bike, i bike for work every day in every weather condition you could think of.....
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Old 08-07-08, 11:04 AM   #24
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If you were truly after "durability," I doubt that you would be trying so hard to find CNCd bars. Bars are forged or drawn for a reason - - part of which is to alter the metal at a molecular level by something called grain-aligning. Metal that has been formed in such ways is actually stronger than the parent-metal it originated from, because the process of manipulating it actually realigns the "grain" of the metal to impart more strength in the directions of most stress.

With a CNCd piece, you can only rely on the ambient strength of the parent-metal because all you are doing is shaving away portions of it to achieve the shape you want.
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Old 08-07-08, 11:17 AM   #25
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well, simply put, im sure it would hold up just fine on the road.

durability is relative. if i was TRULY after durability, why not get steel bars? or steel everything for that matter? why not have a 45 pound tank of a bike? the reason is simple, its not necessary for my needs.

i ride the most durable parts where i feel they are needed for the way i ride. everything having to do with bikes is a balance of durability, performance, weight, and aesthetic. you cannot leave one of the 4 out, its just not practical. ask any manufacturer if they have no interest in paying attention to aesthetic value, im sure theyll let you know that it is, in fact, important. as is the other 3...
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