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first aluminum project

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  • first aluminum project

    ...so what happened is I bought the smallest cross sliding vice from busy bee and put it on my 8 inch delta drill press. Just about a week later i arrange a freind that i met at the skatepark to give me a really old and really beefy bmx stem, the redneck by S&M. Here is what it looks like:

    http://www.revolutionbike.com/STEM-REDNECK.gif

    Dont let the proportions fool you, this stem is HUGE and long. As a comparison I took this photo of the redneck in comparison to another stem that ive been working on





    So i managed to machine it down from 18oz to just over 10 oz. Here are some pics:




  • #2




    surface finish was poor at first because the drill press spindle has ALOT of play in the spline, but i managed to overcome that with an extremely low feed. EXTREMELY! like 20 minutes per inch!



    Mission accomplished. Next to hit the mill is:

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    • #3
      here is a list of operations i did to it:

      shaved the back, slotted the face block of the stem, slotted the stem, drilled a hole thru the middle of the stem, then made it into an oval shape. milled channels in the sides of the stem where it clamps to the steertube. All this was done with a 9/16'ths mill. I would have milled some material from the top too but its not yet my stem so my freind said to not to do it (what a wuss!).

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      • #4
        I have tried that drill press milling machine. Very frustrating.

        I see a lathe chuck. Look at this setup,

        http://vts.bc.ca/metalshop/SB9mill/sb9mill.htm

        Much better. And you have a drill press to help make those pieces.

        You did have better luck than I did however.
        Gene

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        • #5
          Be careful about how much weight (strength) you remove from critical components. A broken handlebar stem is usually instant disaster.

          The safest place to trim weight is the rider.

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          • #6
            Originally posted by john hobdeclipe
            Be careful about how much weight (strength) you remove from critical components. A broken handlebar stem is usually instant disaster.

            The safest place to trim weight is the rider.

            And remember that "road rash" trims rider weight really fast!

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            • #7
              Chris....glad to hear you're finally getting to do some machining even if it is slow, perhaps a bit crude and goes against the norm.
              At least you are learning and I'm bettin you now see what all the ol' guys cautioned you about.
              And you are going to learn from your mistakes...I just hope you don't break your melon in the process
              Russ
              I have tools I don't even know I own...

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              • #8
                Awesome to see your progress...congratulations! Be careful as others have stated...even the pros over do it sometimes with the weight removal thing, proceed with caution but by all means proceed.

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                • #9
                  I broke a regular steel handlebar stem once, and can only say that I was surprized I wasn't killed instantly. Or was I?

                  -Mark
                  The curse of having precise measuring tools is being able to actually see how imperfect everything is.

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                  • #10
                    yea my dad was saying that i "f****d" it up when i machined the sides of it but you gotta understand that this stem is HUGE and that there are much smaller stems with very similar or even more machining. I'm also very careful where i take my bike - only riding the quarterpipes and spines.

                    Check this out http://easternbikes.com/a/products/f...rimReaper.html

                    even I (me being oriented to super light parts) dont approve of this and it is successful model, seems to be pretty solid.

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                    • #11
                      Christian...here's what my nephew Dustin is up to lately...
                      http://www.fatbmx.com/modules/news/a...p?storyid=1724
                      Russ
                      I have tools I don't even know I own...

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                      • #12
                        holy cow! hes a legend. With your help i bet you guys could start a really serious bmx company

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                        • #13
                          Don't let the size of parts be the only determining factor in deciding whether you can get by with cutting on them or reducing their proportions.

                          Strenght of material can determine how much of it you need. I don't mean just aluminum vs. steel, but things like which alloy and how it is heat treated.

                          With most things (think aircraft or automotive parts) we have seen things get lighter and less bulky over the years, but it is due to changes in material and manufacturing processes, not just because someone decided to mill off a chunk and see if they could get by with it....although I am sure there is some of the latter done too

                          Break a yoke like that and you could end up with a stem in the nuts...or the chest... or a broken neck. If you want to see what the failure mode is like, take off the handlbars and try to ride the bike. Now imagine that in the middle of heading down a half-pipe.

                          Paul
                          Paul Carpenter
                          Mapleton, IL

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                          • #14
                            some more progress on another stem

                            heres some progress on that other stem, this one has been done using the milldrill,









                            havent trammed the mill yet because i cant afford a dial indicator with magnetic base, by the time i do that i will have put a homemade powerfeed on the mill made from the 1/2 hp motor from my 8 inch drill press, so next week maybe. I havent machined everything on the stem so if you see a crappy finish with dents and remainder of black paint its from before the machining, i only faced it where necessary because im gonna buff it to a shine =-)
                            Last edited by Elninio; 09-14-2006, 05:30 PM.

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                            • #15
                              Have to say that I admire you for not just up and quitting because you don't have a shop full of machinery. Someday you'll have the cash to have the same shop many of us do now and you'll be way ahead of the game! Not only that, If I need to find you I'll know where you spend a good deal of your time and not in a bar somewhere.
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                              Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

                              It is true, there is nothing free about freedom, don't be so quick to give it away.

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