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
  #11  
Old 10-26-2018, 02:26 PM
Jaroslav Jaroslav is offline
MetalShaper of the Month April 2020, September 2021, November 2022
 
Join Date: Dec 2012
Location: Czech Republic
Posts: 2,602
Default

It is also the EW hardness. I have hard wheels and I use little pressure. The pressure is gradually increasing. I still go in different directions. Gradually, I feel little resistance. That's when it's smooth. Then you can grind and polish.


EW multiple more times. It takes more patience. More time. You were not in all places, and you have a small radius of the lower wheel.
__________________
Jaroslav
Reply With Quote
  #12  
Old 10-26-2018, 02:47 PM
tom walker tom walker is offline
Member
 
Join Date: Dec 2010
Location: st.louis,mo.
Posts: 135
Default

Hello, I metal finish S.S. hubcap skins (.012" thick). I will try to describe the process that works for me. 1.hammer & dolly the surface as smooth as possible, I then use a hard black Arkansas stone on the surface to highlight the highs and lows. Then hammer & dolly or (depending on the depth) I will burnishthe back side with a hard plastic tool using a urethane block as a dolly. When I get the surface near perfect I use a fine India stone to get a uniform surface, finish with increasingly fine grits of wet or dry paper (up to 1200 grit) to a perfect finish. Hope this helps,
Tom

IMG_20180826_134232.jpg

Last edited by Steve Hamilton; 10-26-2018 at 06:41 PM.
Reply With Quote
  #13  
Old 10-26-2018, 06:51 PM
crystallographic crystallographic is offline
MetalShaper of the Month October '14 , April '16, July 2020, Jan 2023
 
Join Date: Dec 2010
Location: Western Sierra Nevadas, Badger Hill, CA
Posts: 4,388
Default

I've tried a bunch of different tools and methods since I started doing "bright work" along about ... um ... 1974?
Was block sanding for chrome plate in 1975, doing 600 grit on the nickel layer, after doing 400 on the copper. First Peb'l entry 1976, an Atalante.


Aluminum ... been doing a fair amount of polish work since way back.


01233_n_17_ hood file.jpg
typical tools and methods on this Duesenberg ... polished slapper (L) and track dolly and comma dolly. Vixen file (L of hood panel)
Must file cleanly - no chips dragged on the back stroke. Period.
No edging. Period.
01276_n_17_ hood sand.jpg
Block sanding. Wet. Start with 320. Criss cross. X pattern.
Change water often. Drops of dish soap help.
Then 400. 600. 800. 1200.

Change to Micro Mesh. Coherent grit sizes, not random -not ranged across 300-to-360 grit range. Nope. Grit size is held 315 to 325, for 320 grit paper. Coherent grit size on each paper. So accurate that the "regular stuff" is like driveway gravel by comparison.... ....

And go to 24,000. Cannot tell which side has grit.

Quarantine every grit stage on every part. Period. Or go back and re-do.
01051_n_16 finish_Peb'l.jpg
Hard machined aluminum sanding blocks, lapped flat on glass plate. With handles. 4in long. 8in long. 11in long. Reveal ALL.

(Like using whetstones. !! Nice work on the hubcaps !!! )

Curved flexible stainless sanding blocks reveal ALL, on curved surfaces.
01054_n_16 rear_Peb'l.jpg
00507_n_16 _ Ribbon.jpg
01208_n_17 body.jpg
J120. Boattail body.

Lots more images, but non-essential for this lesson.
__________________
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.

Last edited by crystallographic; 10-26-2018 at 07:18 PM.
Reply With Quote
  #14  
Old 10-26-2018, 08:14 PM
norson norson is offline
Member
 
Join Date: Nov 2010
Location: Portland, Or.
Posts: 400
Default

Great thread.
__________________
Norm Henderson
Reply With Quote
  #15  
Old 10-26-2018, 08:26 PM
Oldnek Oldnek is offline
Member
 
Join Date: Mar 2011
Location: Ulladulla, Australia
Posts: 1,346
Default

Quote:
Originally Posted by sandmanred View Post
I think that idea will help. Here's a cheap bas****s attempt at a light with a little tape spaced out on the shop window. The multiple line help a lot in locating the offending areas. I've never seen those lights before, thanks for the suggestion!


Still one of the best ways to see where your imperfections are.
__________________
John
EK Holden V8
Reply With Quote
  #16  
Old 10-26-2018, 08:29 PM
Oldnek Oldnek is offline
Member
 
Join Date: Mar 2011
Location: Ulladulla, Australia
Posts: 1,346
Default

Quote:
Originally Posted by tom walker View Post
Hello, I metal finish S.S. hubcap skins (.012" thick). I will try to describe the process that works for me. 1.hammer & dolly the surface as smooth as possible, I then use a hard black Arkansas stone on the surface to highlight the highs and lows. Then hammer & dolly or (depending on the depth) I will burnishthe back side with a hard plastic tool using a urethane block as a dolly. When I get the surface near perfect I use a fine India stone to get a uniform surface, finish with increasingly fine grits of wet or dry paper (up to 1200 grit) to a perfect finish. Hope this helps,
Tom

Attachment 49445
Bloody bewdiful. Finish is sensational.
__________________
John
EK Holden V8
Reply With Quote
  #17  
Old 10-27-2018, 08:44 PM
Kidpaint Kidpaint is offline
Member
 
Join Date: Jan 2014
Location: Garner, Ia
Posts: 262
Default

I was just going to suggest using a grid like you did with the lines. I know at the body shop I work at, all the insurance adjusters have white panels with black squares off grids or lines like you have shown. This really helps them find some
Hard to see variations in the panels.
__________________
Cody Lunning
Reply With Quote
  #18  
Old 10-28-2018, 08:58 AM
tom walker tom walker is offline
Member
 
Join Date: Dec 2010
Location: st.louis,mo.
Posts: 135
Default

Kent and oldnek, thanx for the positive comments. When I'm doing this kind of work, I use the reflection off of a mini-blind to check for any distortion and the location.
Tom
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 07:48 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.