Bill - what a sensational video! I read Heikki's book years ago, and I have seen Wray's reverse-curve shrinking video, but you have brought so many things together in one place, giving me a completely new appreciation of how this process works for making anti-clastic shapes, and preserving material thickness. Exceptionally well done, and very comprehensive!
Outstanding video Bill. You brought it all together. A bit of history. I saw the HOTDOG die at Terry Stolarski's in Minneapolis about 15 years ago. Back in 2001 at FormFest 01, the second metalshapers event, Wray Schelin was talking about shrinking internally over a saddle shaped piece of wood. HYPERBOLIC paraboloid is the technical term. The shape defined by a quadratic equation....I knew Calculus 2 would teach me something...someday. Anyway, it took me years to understand what Wray was trying to explain. Your video explained it so very well. Great, great job! Btw, I think I may have a wooden log that Wray and I made at one of the early Metalmeets. The nice thing about wood is the metal doesn't slide around as much. If it didn't end up in the burn pile, I'll bring it to Jim's next week.
Great video bill! I love that you brought something from a related field over to metal shaping. The idea is so brilliant and so simple. Do you typically match the radius of the lower die with the radius of the finished part?
Hi, Thanks. The lower radius doesn't need to match your end size. The process allows you to develop the shape by shrinking the center, you would then adjust the form to suit your needs, if that makes sense. B
that's an amazing die setup. I learned how to do the internal shaping from Ray but he just had a piece of lumber from a pallet that he had sculpted out a saddle shape on. It worked really well. I didn't know there was an automated version of it. I would really like to see how you planish that. That's what I found challenging. Thanks for another great video.
tensile stretch would probably be a better description than elastic stretch. I'd think it's still plastic deformation to give you the permanently elongated/stretched shape. if it was stretched in the elastic region, it would spring back. And tensile stretch is a pretty good opposite for compressive.
Hi, I agree with you 100%. A challenge I have with the videos is using language to explain complex ideas in a way that everyone understands. I'm trying to paint a picture that most viewers would understand, even if the use of word is not totally correct, hope that makes sense. B
Bill, thank you for your data, analysis and explination. Nothing speaks like accurate data! Looking forward to your next video! Question - Would the anti-clastic die set perform as well (or better?) in the Pulmax (prescribed stroke machine) as opposed to the power hammer (prescribed force machine)?
Hi, in an effort for me to understand better, is it only this video or all of the videos? When I use the Pullmax, I have to run a phase converter and that is the noise in the background. thx Bill
@@williamtromblay6795 Bill - I know you want to focus on metalworking rather than video production, and I can certainly understand that, but there is a noticeable 'buzz' throughout this video, and I noticed the same phenomenon in your 'Thumbnail Shrinking on the Pullmax' video. This could well be caused by your phase converter, but I wanted to let you know, so you can see if there may be some workaround. Again, I LOVE your videos, just want to give you a more detailed report on what I'm hearing.
Hi Bill .... another geat informative video ... can I ask what might be a dumb quesion .... Could you do the same in a pullmax using the die you had in the power hammer or would it damage the pullmax because its not really made for hammering? Cheers Chris.
I don't understand after the spine forms, how you would finish the shrink with the cross-pein die. Would you leave the spine and finish the shrink manually?
The spine is like a tuck, you shrink the spine and tuck the same way. On the reverse you start shrinking by working from the outboard of the panel into the center. A tuck is shrunk from inboard and working your way to the edge. Let me know if you need more info. B
Bill - what a sensational video! I read Heikki's book years ago, and I have seen Wray's reverse-curve shrinking video, but you have brought so many things together in one place, giving me a completely new appreciation of how this process works for making anti-clastic shapes, and preserving material thickness. Exceptionally well done, and very comprehensive!
Thank you!
Very good video's for people interested to learn metal shaping and do it the right way WELL DONE William !
Thank you Peter
Dont worry about your video quality, the content is first class, well delivered and informative. I like your question and answer style - thank you
Very well explained. Thanks for the trouble you go to making these videos.
Wow - this is amazing. Makes perfect sense. Definitely earned a subscription from me. Looking forward to now watching all your past content. 👍👍😎👍👍
Awesome video and another book to add to my list. Looking forward to trying the technique
Great video and great explanation of the reverse curve shrink. I've never seen it explained this well...thanks.l
Glad it was helpful!
Thank you for the grate information!
Another quality video. Thanks for sharing your expertise. Cheers👌👍
I just bought the Creative Metal Forming book in digital form from Apple Books for $10
Thanks. I've learnt things from every video so far. Great teaching.
Thanks for watching
As a sheet metal newb, I find your explanation and examples very helpful.
Outstanding video Bill. You brought it all together. A bit of history. I saw the HOTDOG die at Terry Stolarski's in Minneapolis about 15 years ago.
Back in 2001 at FormFest 01, the second metalshapers event, Wray Schelin was talking about shrinking internally over a saddle shaped piece of wood. HYPERBOLIC paraboloid is the technical term. The shape defined by a quadratic equation....I knew Calculus 2 would teach me something...someday.
Anyway, it took me years to understand what Wray was trying to explain. Your video explained it so very well. Great, great job!
Btw, I think I may have a wooden log that Wray and I made at one of the early Metalmeets. The nice thing about wood is the metal doesn't slide around as much. If it didn't end up in the burn pile, I'll bring it to Jim's next week.
HI Kerry, thanks for the background on the hot dog die. I can see why the wood would be nice to use, see you next week. B
Fantastic demonstration and explanation.
Thanks
Great video bill! I love that you brought something from a related field over to metal shaping. The idea is so brilliant and so simple.
Do you typically match the radius of the lower die with the radius of the finished part?
Hi, Thanks. The lower radius doesn't need to match your end size. The process allows you to develop the shape by shrinking the center, you would then adjust the form to suit your needs, if that makes sense. B
that's an amazing die setup. I learned how to do the internal shaping from Ray but he just had a piece of lumber from a pallet that he had sculpted out a saddle shape on. It worked really well. I didn't know there was an automated version of it. I would really like to see how you planish that. That's what I found challenging. Thanks for another great video.
Hi, Thank you for the note, will do a video on how to planish a reverse in the future. B
I have plenty of metal shaping books but not the Creative Metal Forming one. Looks like a purchase is in order.
tensile stretch would probably be a better description than elastic stretch. I'd think it's still plastic deformation to give you the permanently elongated/stretched shape. if it was stretched in the elastic region, it would spring back. And tensile stretch is a pretty good opposite for compressive.
Hi, I agree with you 100%. A challenge I have with the videos is using language to explain complex ideas in a way that everyone understands. I'm trying to paint a picture that most viewers would understand, even if the use of word is not totally correct, hope that makes sense. B
Bill, thank you for your data, analysis and explination. Nothing speaks like accurate data! Looking forward to your next video! Question - Would the anti-clastic die set perform as well (or better?) in the Pulmax (prescribed stroke machine) as opposed to the power hammer (prescribed force machine)?
Hi, I have not tried it in a Pullmax. I would think it would work fine with a long stroke length.
Very informative! Thank you very much! (Just a pity about the sound quality, but that's only a small detail... ;-)
Hi, in an effort for me to understand better, is it only this video or all of the videos? When I use the Pullmax, I have to run a phase converter and that is the noise in the background. thx Bill
@@williamtromblay6795 It was only this one. It does sound like a phase converter or something similar is running. Fantastic video despite that.
@@williamtromblay6795 Bill - I know you want to focus on metalworking rather than video production, and I can certainly understand that, but there is a noticeable 'buzz' throughout this video, and I noticed the same phenomenon in your 'Thumbnail Shrinking on the Pullmax' video. This could well be caused by your phase converter, but I wanted to let you know, so you can see if there may be some workaround. Again, I LOVE your videos, just want to give you a more detailed report on what I'm hearing.
Thank you, will see what i can do for the future. @RonCovell
Hi Bill .... another geat informative video ... can I ask what might be a dumb quesion .... Could you do the same in a pullmax using the die you had in the power hammer or would it damage the pullmax because its not really made for hammering? Cheers Chris.
Hi, The concept will work just fine in a Pullmax and we are working on the same concept in a English wheel.
I don't understand after the spine forms, how you would finish the shrink with the cross-pein die. Would you leave the spine and finish the shrink manually?
The spine is like a tuck, you shrink the spine and tuck the same way. On the reverse you start shrinking by working from the outboard of the panel into the center. A tuck is shrunk from inboard and working your way to the edge. Let me know if you need more info. B
@@williamtromblay6795 Thank you. I understand. Time to rewatch the video then give it a try.