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  1. #1
    www.theheadbadge.com cudak888's Avatar
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    When a crack isn't a crack - the days of pressed lugs

    It pays to know your lugs. These pressed Bocama Competition 83's often came from Bocama with a visible joint line up front. Depending on the skill or time available to the builder, little imperfections such as these sometimes visibly made their way onto a frame:





    It's helpful to know these small oddities. Can save anyone a lot of potential panic.



    -Kurt

  2. #2
    Rustbelt Rider mkeller234's Avatar
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    Thats pretty cool. I checked my 78 professional and the builder took the time remove the line.
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  3. #3
    www.theheadbadge.com cudak888's Avatar
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    Quote Originally Posted by mkeller234 View Post
    Thats pretty cool. I checked my 78 professional and the builder took the time remove the line.
    The upper lug on this '78 was done right, surprisingly enough. Probably finished from Bocama well enough that it didn't show in the first place.

    Though the finish on this Pro is a little sub-standard in comparison to my PY-10, it certainly is the best I've seen out of a common, production Raleigh.

    -Kurt

  4. #4
    Rustbelt Rider mkeller234's Avatar
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    Yes, my Professional is built noticeably better than my Gran Sport as well. Not saying it's perfect, but it's very noticeable.
    |^^^^^^^^^^^^^^| ||
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    |_..._..._______===|=||_|__|..., ] -
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  5. #5
    Ride Fast and Ride Safe! gioscinelli's Avatar
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    Hmmm, I wondered how the devil those lugs were brazed. Are all lugs fashioned to the frame like shown, even for high end steel lugged frames? Great information. Thanks
    85 Gios Professional - 95 Cinelli SC -06 Colnago C50

  6. #6
    Seņor Member 4Rings6Stars's Avatar
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    Kurt, do you have an extra top lug by any chance? I have the competition 83 bottom and the seat cluster lug but a non-matching top. I've spent hours cutting and filing and it is close but I would love to find the proper lug. If not, are you interested in parting with the set? Or if you don't want to get rid of any of them, any guesses where I could find one?
    Independent Fabrication Planet X-DeSalvo Monstercross Disc-Soma DC Disc-Wicked Fat Chance
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  7. #7
    www.theheadbadge.com cudak888's Avatar
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    Quote Originally Posted by gioscinelli View Post
    Hmmm, I wondered how the devil those lugs were brazed. Are all lugs fashioned to the frame like shown, even for high end steel lugged frames? Great information. Thanks
    They're not fashioned by bending them around the gap; they're simply slid on to each tube, and the brass slides into the gap via capillary action. The tubes are mitered so that they touch each other while inside the lug.

    Quote Originally Posted by 4Rings6Stars View Post
    Kurt, do you have an extra top lug by any chance? I have the competition 83 bottom and the seat cluster lug but a non-matching top. I've spent hours cutting and filing and it is close but I would love to find the proper lug. If not, are you interested in parting with the set? Or if you don't want to get rid of any of them, any guesses where I could find one?
    I know you've been looking for one. I wish you needed a spare seatlug - that I have; otherwise, I'd have to break up my one complete 93 set.

    eBay might be your best bet. Keep searching Bocama.

    -Kurt

  8. #8
    Seņor Member 4Rings6Stars's Avatar
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    I've been keeping my eye out for one for a while. The one I've been filing to match is actually pretty good but not perfect. My triangles ended up a little larger/closer to the border than I wanted.

    Here is an early shot. It's been significantly refined since.


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  9. #9
    Senior Member Michael Angelo's Avatar
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    I'll have to take a look at the Competition to see if there is a visible line on any of the lugs.

  10. #10
    www.theheadbadge.com cudak888's Avatar
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    Quote Originally Posted by Michael Angelo View Post
    I'll have to take a look at the Competition to see if there is a visible line on any of the lugs.
    Probably not - the later Comp GS lugs were not as prone to gaps. They might have been investment cast.

    The Sports, Superbe, Sprite, et. al, however, were severely prone to it, for Raleigh - during the TI era - hardly filed the weld mark at the bottom of the lug. This isn't present on the 1950's examples, which use different lugs - I'm almost certain they used Hayden blanks during this period.

    -Kurt

  11. #11
    Old fart JohnDThompson's Avatar
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    Quote Originally Posted by gioscinelli View Post
    Hmmm, I wondered how the devil those lugs were brazed. Are all lugs fashioned to the frame like shown, even for high end steel lugged frames? Great information. Thanks
    Lugs like that are stamped out of sheet metal, then folded and welded at the seams. Sometimes the weld bead doesn't completely fill the seam and you get the lines as above.

    Bottom line: it's a cosmetic issue, not a structural issue.

  12. #12
    Senior Member randyjawa's Avatar
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    Depending on the skill or time available to the builder, little imperfections such as these sometimes visibly made their way onto a frame:
    Sometimes? I see sloppy craftsmanship frequently on old road bicycles.
    Learn how to find, restore and maintain vintage road bicycles at... MY "TEN SPEEDS"

  13. #13
    www.theheadbadge.com cudak888's Avatar
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    Quote Originally Posted by randyjawa View Post
    Sometimes? I see sloppy craftsmanship frequently on old road bicycles.
    I was thinking about bikes in the Raleigh Pro's caliber when I stated that.

    -Kurt

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