360CICJ Posted January 5, 2014 Report Share Posted January 5, 2014 In mandrel bending, if the pipe is tapered very much it's going to crease the pipe. That is, of the radius of the pipe is larger than the radius of your mandrel. If the radius is smaller it will probably crush or create a flat spot inside the bend. Quote Link to comment Share on other sites More sharing options...
Young Guns Racing Posted January 6, 2014 Author Report Share Posted January 6, 2014 In mandrel bending, if the pipe is tapered very much it's going to crease the pipe. That is, of the radius of the pipe is larger than the radius of your mandrel. If the radius is smaller it will probably crush or create a flat spot inside the bend. Which is exactly what I dont want, this changes velocity and pressure waves inside the pipe which defeats the purpose. I have been talking to JD. Hopefully we can work out something. Id like to be able to acutally do this on a small production level. Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted January 6, 2014 Report Share Posted January 6, 2014 I like the pieced together pipe. It shows the workmanship and time that was involved. each one is a little different. Quote Link to comment Share on other sites More sharing options...
camatv Posted January 17, 2014 Report Share Posted January 17, 2014 my thoughts and research.. hand coned like you did are bad ass yes they take forever. BUT reworking some of the pieces to include the curves is real work... ( hard to explain) hydro formed, OR oil formed. 2 ways to do this as i understand. make like you did THEN cut right down the sides, THEN squish them flat thats your basic hydro pattern. there is another safer way to do the expansion not using a pressure washer.. google pipe testing.. stamps this i'm not to sure about but is the best way. in my opinion IF you can get a stamp just for the big curves at the front that works easily. most use one large stamp and then weld all together, then cut across and fit to jig, bike etc. most all pipes are made this way. i have been told that only 2 companies will produce stamps and own the rights to them, you have to pay for them, i find this hard to believe because i have seen multiple one off or very very small run pipes made from what i believe are stampings, i cannot believe that a shop would pay the 10,000 + bucks i was told to run and develop a stamp. if jd would make a stamp you would need to have a finalized perfect pipe figured out them cut in half for the stampings development. in these modern laser guided times i feel it should be very cheap to produce a decent die shape. and just depend on the material the die is actually made of. last 2 ways is hand forming by hand, ( mallet and sand bag ) OR with a mold or "puck".... just the ways i have figured it out..i am in no way an "expert" these are just my findings from hours of research and limited dealings with places that do this all the time. like i said dont expect much info to come from places that build pipes for $$$ Quote Link to comment Share on other sites More sharing options...
camatv Posted January 17, 2014 Report Share Posted January 17, 2014 check these out Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 18, 2014 Report Share Posted January 18, 2014 (edited) I have a guy who can produce you stampings. He was gonna start new stampings for David at Rocket as the original dies were Mia after sitting in storage. If you are SERIOUS, I will make some calls. PM me and Let me know and I can try to get you in touch. (He currently makes stuff for magnum) Edited January 18, 2014 by trickedcarbine Quote Link to comment Share on other sites More sharing options...
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