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  #41  
Old 10-19-2019, 04:01 PM
Jaroslav Jaroslav is offline
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Thank you Kent. Your praise really pleases me. I am trying to give feedback from the process for lessons learned.
Today, I thought I could smoothly make 2 pieces. Machines were set up. Tools tested on old metal samples.
When I started to shape the first bend, the machine had a different sound, and the metal plate jumped more. It was very difficult to hold the plate in the correct position on the backrest. The profile cracked when I used the second tool. Yes, it's clear. I bought a hard sheet metall ..... The way is right but wrong material. You are never smart enough. Further lessons for the school lesson.
But I am also satisfied with the chosen procedure. Material 1 mm sheet allows grinding and polishing under chrome, it is sufficient thickness for further machining.

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  #42  
Old 10-20-2019, 03:08 PM
Brzeczyszczykiewicz Brzeczyszczykiewicz is offline
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Quote:
Originally Posted by Jaroslav View Post
With the second tool, increase the pressure after half a turn with the screw at the bottom.
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Witold
https://photos.app.goo.gl/VTz6ETWQhnKyqUQYA
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  #43  
Old 10-22-2019, 12:42 AM
Jaroslav Jaroslav is offline
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Witold. Thank you for your advice, but there are a lot of points that need to be addressed. Tool shape. 2 levels of shaping and slow adding depth. I was very reassured when I found out that I had poor sheet quality. I tried the principle - as always on old soft sheet samples. Then I bought a new clean sheet metal and everything was different.

The customer he saw the result, the customer has bigger eyes than he used to have in the past.
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  #44  
Old 10-24-2019, 03:05 PM
Jaroslav Jaroslav is offline
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So again. Endless story. I adjusted the tools and bought a soft sheet metall. The measurement showed that the one I used had a higher tensile resistance of about by 50 mpa.
Procedure in pictures. Between leveling the shape of the arc, I carefully shaped the bar profile. The results are better. But the head hurts.

I used slow adding bottom screw in bracket. Good advice. It's more sensitive.
The steps must go exactly one after the other. Gradual shaping Gradual cutting. When you shaped and repared the profile then it is possible to trim excess metal. But you have to leave a piece there and cut it off after the next step and so on. Pretty science.

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You can do it even cleaner. My hand hold.
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Last edited by Jaroslav; 10-24-2019 at 03:11 PM.
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  #45  
Old 10-24-2019, 04:46 PM
Charlie Myres Charlie Myres is offline
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If ever there was a lesson on the values of persistence and patience and ingenuity this is it.

Fantastic work and and inspiration Jaroslav!

Cheers Charlie
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  #46  
Old 10-24-2019, 07:54 PM
Brzeczyszczykiewicz Brzeczyszczykiewicz is offline
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Jaroslav.
I'm glad I could help.
I always use half a turn per transition.
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In the morning I was convinced that this was the only solution.

Witold
https://photos.app.goo.gl/VTz6ETWQhnKyqUQYA
https://www.youtube.com/watch?v=hzcKlFjOAoE
http://forum.poziome.pl/index.php?topic=1989.0
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  #47  
Old 10-24-2019, 11:55 PM
Jaroslav Jaroslav is offline
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Thank you for your interest advice and compliments. Perseverance is a necessity. Sometimes I have to convince myself of direction and efficiency.
Catch all known points and solve the unknowns, think why it is not possible when it is so clear. Machine condition, lower bracket inoperative. The last drop was the hard plate. But I laughed already.
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  #48  
Old 10-25-2019, 12:25 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Jaroslav View Post

.... convince myself of direction and efficiency.

"Fluid thinking."
Keep on keeping on.
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  #49  
Old 10-26-2019, 09:20 PM
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Gojeep Gojeep is offline
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Excellent that the customer appreciated the effort and the outcome too.
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