All MetalShaping

Go Back   All MetalShaping > General Metal Shaping Discussion > Basic questions and answers
  Today's Posts Posts for Last 7 Days Posts for Last 14 Days  

Reply
 
Thread Tools Search this Thread Display Modes
  #41  
Old 10-19-2019, 05:01 PM
Jaroslav Jaroslav is offline
Member
 
Join Date: Dec 2012
Location: Czech Republic
Posts: 784
Default

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.

DSC01731.jpg

DSC01730.jpg

DSC01733.jpg

DSC01736.jpg

DSC01737.jpg
__________________
Jaroslav
Reply With Quote
  #42  
Old 10-20-2019, 04:08 PM
Brzeczyszczykiewicz Brzeczyszczykiewicz is offline
Member
 
Join Date: Sep 2017
Location: Poland
Posts: 48
Default

Quote:
Originally Posted by Jaroslav View Post
With the second tool, increase the pressure after half a turn with the screw at the bottom.
Reply With Quote
  #43  
Old 10-22-2019, 01:42 AM
Jaroslav Jaroslav is offline
Member
 
Join Date: Dec 2012
Location: Czech Republic
Posts: 784
Default

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.
__________________
Jaroslav
Reply With Quote
  #44  
Old 10-24-2019, 04:05 PM
Jaroslav Jaroslav is offline
Member
 
Join Date: Dec 2012
Location: Czech Republic
Posts: 784
Default

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.

DSC01779.jpg

DSC01734.jpg

DSC01783.jpg

DSC01787.jpg

You can do it even cleaner. My hand hold.
DSC01793.jpg

DSC01795.jpg

DSC01800.jpg

DSC01802.jpg

DSC01804.jpg

DSC01805.jpg

DSC01806.jpg

DSC01809.jpg
__________________
Jaroslav

Last edited by Jaroslav; 10-24-2019 at 04:11 PM.
Reply With Quote
  #45  
Old 10-24-2019, 05:46 PM
Charlie Myres Charlie Myres is offline
Member
 
Join Date: Jun 2013
Location: Narrogin, Western Australia
Posts: 344
Default

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
__________________
Why does dust stick to everything, but nothing sticks to dust?
Reply With Quote
  #46  
Old 10-24-2019, 08:54 PM
Brzeczyszczykiewicz Brzeczyszczykiewicz is offline
Member
 
Join Date: Sep 2017
Location: Poland
Posts: 48
Default

Jaroslav.
I'm glad I could help.
I always use half a turn per transition.
Reply With Quote
  #47  
Old 10-25-2019, 12:55 AM
Jaroslav Jaroslav is offline
Member
 
Join Date: Dec 2012
Location: Czech Republic
Posts: 784
Default

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.
__________________
Jaroslav
Reply With Quote
  #48  
Old 10-25-2019, 01:25 PM
crystallographic crystallographic is offline
MetalShaper of the Month October '14 & April '16
 
Join Date: Dec 2010
Location: Western Sierra Nevadas, Badger Hill, CA
Posts: 3,244
Default

Quote:
Originally Posted by Jaroslav View Post

.... convince myself of direction and efficiency.

"Fluid thinking."
Keep on keeping on.
__________________
Kent

http://www.tinmantech.com

"All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919.
Reply With Quote
  #49  
Old 10-26-2019, 10:20 PM
Gojeep's Avatar
Gojeep Gojeep is offline
MetalShaper of the Month March 2015
 
Join Date: Nov 2013
Location: Eastern Melbourne, Australia
Posts: 1,916
Default

Excellent that the customer appreciated the effort and the outcome too.
__________________
Marcus
aka. Gojeep
Victoria, Australia
http://willyshotrod.com

Invention is a combination of brains and materials.
The more brains you use, the less materials you need.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -5. The time now is 11:00 AM.

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.