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Forging steel seat post clamp or collar clamp

Old 08-01-20, 08:58 PM
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Petit Breton
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Forging steel seat post clamp or collar clamp

HELLO FROM ARGENTINA I WANTED TO ASK IF SOMEONE HAS EXPERIENCE IN MAKING THE OLD STEEL CLAMPS THAT THE BIKES WITH BRIANZA TYPE LUG WAS CARRYING. THE SAME LACK OF brand IN GENARAL SOME WERE STAMPED WITH THE BRANDS ""OLMO"" OR ""FREJUS"" OR ""MAGISTRONI"". I HAVE TO REBUILD THESE CLAMP AND I DON'T KNOW WHETHER TO FORCE THEM FORGED OR COLD FORCED. EXCUSE THE EDITOR I AM USING TRANSLATOR. thank you
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Old 08-01-20, 09:51 PM
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Are you trying to make replacements? Seems to be that a simple band with a brazed on binder would do the trick. Might have to use a beautiful thing (lathe) to produce the bans to a fit spec first.

Unsure what you mean by force them and doubt that they were forged as I know that process. Andy
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Old 08-02-20, 07:02 AM
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Originally Posted by Andrew R Stewart View Post
Unsure what you mean by force them and doubt that they were forged as I know that process. Andy
Andy, I think the word "forced" he used should have translated to "stamped". Google Translate is remarkably good but not perfect.
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Old 08-02-20, 11:02 AM
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Blacksmiths Forge things.. on anvils with hammers and red hot steel..

Fabricating can combine a piece of steel tubing and brass brazing on a piece which a smaller tube*
will allow a bolt to squeeze a slot you then cut to tighten this clamp you have made

* these are pieces made to do this...
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Old 08-02-20, 12:45 PM
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Hi, I meant stamping the markings on the seat collar. the translator is not always accurate with the words. I have some experience with metal forging in cutlery. It would not be a problem for me. but the query is if someone from this forum has made these pieces. the process of the lathe I discard it since I DO NOT HAVE a lathe and also here in Argentina the labor of a turner is usually somewhat expensive. They will also wonder why I do not buy the necklace on eBay or similar. It is also too expensive to buy foreign pages since the value between the Argentine peso and the American dollar is very disadvantageous for Argentines
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Old 08-02-20, 01:55 PM
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Much of bike parts are made in Taiwan... perhaps you have importers buying from same sources direct from there?

Seek stamping numbers and letters tools? https://www.beaducation.com/pc/36-me...ber-stamp-sets
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Old 08-02-20, 06:15 PM
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I would suggest posting in Frambuilders https://www.bikeforums.net/framebuilders/

and now i have to have chimichurri sauce
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Old 08-03-20, 11:36 AM
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Thank you for responding. My intention IS NOT TO MANUFACTURE seat collars in industrial quantities. it is only learning to make this piece that are NOT VERY COMMON to find in my country. in the art of restoring it would be to recreate this piece as faithfully as possible as it was originally. Thank you
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Old 08-03-20, 11:58 AM
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...if you are talking about these, they got used on almost everything those guys made, during a fairly long time period.
For something like that, your best bet is finding them used, off dead bicycles. I believe that is a stamp forged part (stamped into a mold).

Stamp forging is very difficult to replicate by a home shop worker, mostly because you need the block or the mold to do so.
I guess you could maybe pantograph something that you pounded out and machined to roughly the same profile, but it would be a whole lot of work.

There are some modern seat clamps, (made mostly from aluminum), that you could maybe carve to an approximation of one of those, if you can find one in the proper diameter.
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Old 08-03-20, 12:02 PM
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https://www.ebay.fr/itm/vintage-40-5...MAAOSwMwddgAbp

...75 euro is a lot of money for this part, but considering the hours it would take to manufacture one, it's probably cheaper.
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Old 08-03-20, 01:54 PM
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hello in Argentina bring a seat collar that is worth 75 dollars would cost much more and would cost around 134 dollars in Argentina since there is a dollar transaction tax of 30% on the value of the product and another import tax of 50% on the the value of the product that is equivalent to 134 dollars placed in Argentina and that value represents almost 25% of the salary of a low-class worker for us prohibitive, in addition to the work time left over in these times of world economic recession. With respect to stamping the brand, it is not necessary to use the stamping technique. Electro-etching technique can be used. thank you
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Old 08-03-20, 02:35 PM
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...Argentina (and SA in general) is not exactly new to bicycles. Are there no sources of used bicycles, like scrap yards and the like, similar to what we use for this purpose here ? I used to visit the waste transfer station here, and sift through a huge pile of bikes when I needed something old.
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Old 08-03-20, 02:50 PM
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Originally Posted by Petit Breton View Post
Hi, I meant stamping the markings on the seat collar.
"Stamping" is also a method of forming a piece of metal into a shape. Seat collars can be made by stamping a piece of sheet metal to the desired shape using a forming die in a press.
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Old 08-05-20, 06:08 PM
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Originally Posted by 3alarmer View Post
.
...Argentina (and SA in general) is not exactly new to bicycles. Are there no sources of used bicycles, like scrap yards and the like, similar to what we use for this purpose here ? I used to visit the waste transfer station here, and sift through a huge pile of bikes when I needed something old.
Hello, there are no such junkyards here, but it is a good point that you say. It occurs to me that the old bike shops, those very small neighborhood or town maybe find something. thanks for answering
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