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Thread: Seat tube slotting setup procedure

  1. #1
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    Default Seat tube slotting setup procedure

    Hi gang,
    One procedure that I am always trying to improve is slotting seat tubes. They say a picture is worth a thousand words. Mind sharing a few thousand words about your process and/or setup? I know there's quite a variety ranging from hacksaws to using a cut-off wheel in a die grinder to using slotting (slitting?) saws in a mill.
    TIA!
    zank
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    Default Re: show us your seat tube slotting setup/procedure

    i make a small notch in the lug with the sharp side of a 6" half round, grab the starret precision hacksaw technology, site
    my target, and show the seat lug who's boss. then i follow up with another pass using a frame that holds two thin blades
    simultaneously. from end to end it's a 40 second process atmo. is there a label for this?
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    Default Re: show us your seat tube slotting setup/procedure

    I drill a hole, then hacksaw it like Richard. I follow it up with small files and likely take longer. I then file the inside edge of the slot where it will contact the seat post. A chamber on it keeps scratches down.
     
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    Default Re: show us your seat tube slotting setup/procedure

    I use 3 hack saw blades at once for the desired width.
     
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    Default Re: show us your seat tube slotting setup/procedure

    I drill & slot them before hand. After they're built & reamed, I just cut the tab and dress it. Perfect every time.



    "It's better to not know so much than to know so many things that ain't so." -- Josh Billings, 1885

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    Default Re: show us your seat tube slotting setup/procedure

    Pretty much what Craig and Richard said,I drill a whole where the bottom of the slot will be,notch the top with a round file and use two hacksaw blades together to cut the slot and then clean it up with a warding file and a quick pass on the inside of the slot with a 6" round file clean it up and take off any burs.
    This all takes about 10 minutes max but hey, I'm slow yo.
    -Eric
     
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    Default Re: show us your seat tube slotting setup/procedure

    I use beams of pure focused hatred & confusion that shoot from my forehead on demand.
    Slow day at the office, Zank?
    - Garro.
    Steve Garro, Coconino Cycles.
    Frames & Bicycles built to measure and Custom wheels
    Hecho en Flagstaff, Arizona desde 2003
    www.coconinocycles.com
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    Default Re: show us your seat tube slotting setup/procedure

    Quote Originally Posted by steve garro View Post
    I use beams of pure focused hatred & confusion that shoot from my forehead on demand.
    Slow day at the office, Zank?
    - Garro.
    Lemme know next time you are doing a set Steve, I'll set mine out- you can probably hit them from Arizona.

    But for the record. I do them sorta like Archie but I'd like it to be more like Carl
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    Default Re: show us your seat tube slotting setup/procedure

    We do it in the mill. Because our binders are 4130, we had to buy a solid carbide saw.
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    Default Re: show us your seat tube slotting setup/procedure

    I just drill the hole and the use a cut off disk in a die grinder. Two quick swipes, one down each side of the slot and its done....takes seconds:

    Dave Anderson
    Anderson Custom Bicycles
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    Default Re: show us your seat tube slotting setup/procedure

    Quote Originally Posted by e-RICHIE View Post
    i make a small notch in the lug with the sharp side of a 6" half round, grab the starret precision hacksaw technology, site
    my target, and show the seat lug who's boss. then i follow up with another pass using a frame that holds two thin blades
    simultaneously. from end to end it's a 40 second process atmo. is there a label for this?
    Two blades in one frame. Brilliantly simple.
     
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    Default Re: show us your seat tube slotting setup/procedure

    I got this machine from Ibis. We call it "Jo Jo, the little slotter that could". It works great. I drill a hole, ream then slot, debur and hone. The machine has a two posts, one 27.2 and a 28.6. The table slides with a handle. I put the frame on the post and pull the handle. The slotting process takes less time than it takes me to pull the frame from my work stand and walk to the machine. I've gotten rid of most large tools I acquired in the Ibis days but this large, heavy machine, while taking up a lot of room is worth the space.
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    Carl Strong
    Strong Frames Inc.
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    Default Re: show us your seat tube slotting setup/procedure

    Quote Originally Posted by bellman View Post
    Lemme know next time you are doing a set Steve, I'll set mine out- you can probably hit them from Arizona.
    I can do it directly over the line of a rotary dial phone. - Garro.
    Steve Garro, Coconino Cycles.
    Frames & Bicycles built to measure and Custom wheels
    Hecho en Flagstaff, Arizona desde 2003
    www.coconinocycles.com
    www.coconinocycles.blogspot.com
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    Default Re: show us your seat tube slotting setup/procedure

    Quote Originally Posted by steve garro View Post
    I can do it directly over the line of a rotary dial phone. - Garro.
    Excellent.

     
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    Default Re: show us your seat tube slotting setup/procedure

    Quote Originally Posted by suzyj View Post
    Excellent.

    i am so jealous & I really mean that. I even had one in that same color!
    Unfurtunately my method slots the BOTTOM of the ST if phoned in to the S-Hemisphere..... - Garro.
    Steve Garro, Coconino Cycles.
    Frames & Bicycles built to measure and Custom wheels
    Hecho en Flagstaff, Arizona desde 2003
    www.coconinocycles.com
    www.coconinocycles.blogspot.com
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    Default Re: show us your seat tube slotting setup/procedure

    Thanks, all! I always learn something from seeing what other folks are doing, even on the most mundane tasks.
    Mike Zanconato
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    Default Re: show us your seat tube slotting setup/procedure

    Quote Originally Posted by suzyj View Post
    Excellent.

    dig that coaster!
     
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    Default Re: show us your seat tube slotting setup/procedure

    Quote Originally Posted by Tom Kellogg View Post
    We do it in the mill. Because our binders are 4130, we had to buy a solid carbide saw.
    I do mine like that, except in a lathe. I have a tube clamp that mounts to my tool post, and an arbor that goes in the chuck. It's a pain to set up, so sometimes I do it with a Dremel.
    Eric Doswell, aka Edoz
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    Default Re: show us your seat tube slotting setup/procedure

    Pls. stop me if I'm wrong. This belongs in the framebuilders wiki. I'll leave behind an perm. re-direction link.
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  20. #20
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    Default Re: show us your seat tube slotting setup/procedure

    This is my approach
    Sparks
    cedarboro cycles
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