Help finishing edge of a Mule. | The Slingshot Community Forum

Help finishing edge of a Mule.

Discussion in 'Slingshot Building' started by nmshoot, Jul 5, 2015.

By nmshoot on Jul 5, 2015 at 11:37 PM
  1. nmshoot

    nmshoot Active Member

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    I slapped some ABS scales and green vulcanized fiber on a Metro mule frame and I am a little stumped on how to finish the edges. Maybe @Metropolicity could chime in here, since I got this idea from him. I started to sand the edges and it was just dulling the scales a little to much for my liking.
    Mule ABS.jpg
     
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Comments

Discussion in 'Slingshot Building' started by nmshoot, Jul 5, 2015.

    1. JTslinger

      JTslinger Veteran Member Staff Member Moderator

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      Love the MULE!
       
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    2. Metropolicity

      Metropolicity Veteran Member Vendor

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      Here's my recipe for finishing ABS, specifically, the haircell textured stuff.

      1. shape as needed, I usually use a 1/8 router bit to do quick work on it. It's a fast feed rate since ABS has a low melting temp. You can also just shape it by hand but a router makes a nice consistent edge on it and reveals the same amount of smooth against the textured face. You want to use a cutting tools over abrasive tools.

      2. Use 220 grit paper right away, skip the more aggressive grits. If you have a foam backed version of this, even better. It clogs paper pretty quick but it just need to even out the surface.

      3. Use fine Scotch brite pad on the areas that you sanded. This will further buff it out. The scotchbite catches any ABS particles and actually smooths out the surface. You can use alcohol to clean off the sanded areas, DO NOT use acetone or methyl hydrate. ABS is a styrene based polymer which means it will melt with solvent based cleaners.

      4. Here's the magic, use paste wax and rub it all over the ABS, starting with the sanded edge. This will restore the lustre and colour of the black. You can also rub it into the texture areas to clean it up. The wax helps seal the polymer pours you opened up with the sanding and is also reduces the fuzz and eliminates the dullness.

      That is a FINE looking Mule, makes me want to give it a try. I have some 3/16 thick ABS that seems to make a nice frame after applying it to a 1/4" core.
       
      Last edited: Jul 6, 2015
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    3. nmshoot

      nmshoot Active Member

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      @Metropolicity , I assume a 1/8" round over bit is what you are talking about, since it's 1/8" ABS. I only have a 1/4" round over, I guess I have to hit the store tomorrow. Thanks for the tip on the paste wax, hopefully it fixes some of the dull spots due to my crap sanding.
       
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    4. Firefly

      Firefly Active Member

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      I am excited to see how that turns out! It is looking very nice!
       
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    5. Kevin

      Kevin Veteran Member

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      Good looking frame. Hope you get it like you want it.
       
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    6. nmshoot

      nmshoot Active Member

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      It's a b-day gift for my son, so I was hoping that it came out a little better. I think I need some serious practice on finishing.
       
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    7. Kevin

      Kevin Veteran Member

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      It'll bug the crap out of you, but he'll likely not even notice that it's not perfect.:)
       
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    8. Jim S.

      Jim S. Veteran Member

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      Could you use a cotton buffing wheel with the white rouge to bull the edges? Metro? that was what I had planned for the black monkey NM sent me.
      BTW how did you finish the ends of the aluminum tubes you put in the frame?
      Full size or % mule?
       
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    9. Metropolicity

      Metropolicity Veteran Member Vendor

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      Counter sink bit, that's how I do it.

      I never buff the edges of my cores, just a scotch Brite rub
       
    10. twang

      twang Veteran Member

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      Why is this shape called "mule"?
       
    11. Jim S.

      Jim S. Veteran Member

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      Ask Toddy it is his design and that is what he calls it.
       
    12. Kevin

      Kevin Veteran Member

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      It is a cross between two frames. One is the sps but I can't remember the other. That's where "mule" comes from.
       
    13. twang

      twang Veteran Member

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      thanks for the info guys, I have wondered for a while.
      I guess hee aaww ways calls it that.
       

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