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how to cut carbon steer tube?(7 posts)

how to cut carbon steer tube?jack
Oct 20, 2001 6:56 PM
what is the correct way to cut a carbon steer tube? what do i use to cut it? another question what are some of the lighter full carbon forks out there?
re: how to cut carbon steer tube?SFG
Oct 21, 2001 9:20 AM
I asked awhile ago and got no responce so I just used a regular hack saw and it worked fine (200+ lbs and have been riding the full carbon fork for over a year). You just need to take it easy and don't press too hard. try making a practice cut of the first half inch if you can.
touchy subject....C-40
Oct 21, 2001 10:23 AM
Apparently Reynolds advises using a carbide grit blade, commonly recommended for cutting very hard materials like tile. LOOK instructions say to use a "metal saw". I've always used a sharp 24T or 32T hacksaw blade, applying light pressure while cutting. I've never seen the slightest hint of fraying or damage. There are those that claim I may have "damage I can't see" even under a microspcope, using this method. As an engineer, I think these folks have too much imagination.
after the last colloquy on the subject, I went out and bought abill
Oct 21, 2001 1:03 PM
carbon grit blade (it was like $5-$10 at a local hardware store), and cut off about .5 cm (I had some spacers over the stem until I was sure about the height). It definitely makes a cleaner cut than a hacksaw, but it's actually harder to cut straight. I then used some very fine grit sandpaper (#400) to take down some of the higher spots (which did not fray as much as even a hacksaw -- the cut is still very clean; not microscope clean, no doubt, but very clean). I still left about .5 cm over the stem, for insurance. I fugure that microscopic cracks ain't going that far -- there is no stress within at least a cm of the cut.
I probably will become a statistic soon, but, so far so good.
re: how to cut carbon steer tube?Skip
Oct 21, 2001 3:54 PM
I measured and marked my AME fork by using a 20 mm CK spacer and a sharp pencil, drawing a line completely around the fork. Then, I tightly wrapped over this area with a layer of 2" scotch tape, carefully positioned the fork in the Park threadless saw guide, SG-6, on the mark, and mounted it securely in a vise. I positioned the vise under the outdoor water spigot, and ran water over the unit, as I used a very light, almost zero, downward force with a brand new 32 TPI metal carbide hacksaw to make the cut with full strokes. The water flushes the carbon dust from the kerf, and reduces your exposure to the same. It sliced perfectly through the fork like the perverbial hot knife through butter. It left a perfectly straight and smooth cut on the fork, with absolutely no splintering or fraying of the CF fibers. I, probably like you, had more than a couple reservations about cutting my expensive CF fork - fearing ending up with a $400 paper weight, but after my experience, would not think twice about doing it again. (I bought a couple of those carbide grit saws from Sears - both a round rod and flat one - neither will fit into the Park guide. The hacksaw works just fine). Measure twice, cut once; Best of luck!
re: how to cut carbon steer tube?Birddog
Oct 22, 2001 7:44 AM
I drive by one of the larger and most reputable LBS's in my area nearly everyday, and I've been wondering what those guys were doing out by the faucet; Now I know. JUST KIDDING
I think what you did was overkill, but then I'm aware of how comforting it is to be relatively sure, since I cut mine just last month. I used a 32 t metal cutting blade and took my time. I flat filed the cut to square it up and lightly sanded the edge to give it a little champfer.I can assure you that the LBS is not going to the extreme that you did. The one mentioned above does more service work than all others combined in this area, and they use a plain old hacksaw, and I don't know of any failures. Given the number of Atty's that ride bikes, I'm sure they are staying on the safe side.
re: how to cut carbon steer tube?Skip
Oct 22, 2001 12:36 PM
Yes, I also used sand paper,(400, 600 grit), to smooth the cut edge and champfer, or sl. bevel, the outside edge too. Probably all overkill, and far above & beyond what 90% of the LBS do, but I am anal retentive.