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  #1  
Old 07-11-2022, 06:33 AM
dwollen89 dwollen89 is offline
 
Join Date: Feb 2020
Location: Austin, MN
Posts: 57
Default Dimpling Question

I'm dimpling my HS skins using a Cleaveland C-Frame and dies. I'm getting a lot of distortion between the holes, particularly on the line of holes in the middle of the skins. At first, I thought maybe the holes were under dimpled, so I gave them one more hit, but it didn't help. I'm sure the dimples aren't under done, so I'm wondering if the distortions are normal or maybe I'm over dimpling.

Thoughts?

I'm really enjoying building, but there is a steep learning curve...
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  #2  
Old 07-11-2022, 06:46 AM
RussellT RussellT is offline
 
Join Date: May 2016
Location: Albany Western Australia
Posts: 107
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Are you using a steel hammer? If not you need to, a couple of firm hits and the sound will tell you when the dimple is formed.

Russell
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  #3  
Old 07-11-2022, 07:02 AM
dwollen89 dwollen89 is offline
 
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Location: Austin, MN
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Yes I am. Iím hearing the sound change, very distinct. Wondering if I'm actually hitting it too hard. Iím not over head smashing it, but definitely giving 2 decent whacks with a 16 oz hammer.
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  #4  
Old 07-11-2022, 07:19 AM
RussellT RussellT is offline
 
Join Date: May 2016
Location: Albany Western Australia
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Not sure then, can you post a pic?
Cleaveland dies and a C frame is a good combination although I did use one without the spring to hold the ram pin up, meaning the die would sit on the work before the hitting.

Russell
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  #5  
Old 07-11-2022, 07:29 AM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,499
Default Dimples

Very odd. A photo would help.
I used a C-frame and Cleveland dies as well. Destroyed four HF 2lb dead blow hammers. Lifetime warranty pays.
I also remove the spring. Less chance of a extra hole mistake.
Check you have a mated pair of standard dimple dies.
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Donated 12/01/2021, plus a little extra.
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I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #6  
Old 07-11-2022, 08:20 AM
dwollen89 dwollen89 is offline
 
Join Date: Feb 2020
Location: Austin, MN
Posts: 57
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I think I figured it out. At the risk of feeling embarrassed, I’ll post my thoughts if it’ll help someone in the future forum search. I think I was just hitting it too hard. I watched the Cleveland video again and reset my table and dimpled. I did the other side of the HS and just went about 1/2 to 3/4 force of what I was doing and they came out perfect. The only other thing could have been that my male die wasn’t proud enough of the table as the distortions are convex on the finished surface. Maybe a combo of the two. Fortunately, it’s on the bottom side of the HS, so nobody will ever see it. A wise tech adviser told me recently about 20 times that I’m building a tractor, not a watch. I’m constantly telling myself that to keep from going crazy, lol. Onward I go…
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Last edited by dwollen89 : 07-11-2022 at 08:51 AM.
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  #7  
Old 07-11-2022, 09:52 AM
John Tierney John Tierney is offline
 
Join Date: Jan 2006
Location: Vonore, TN
Posts: 583
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Make sure your C-Frame is not in the middle of a table. You want to have the impact load transferred from the hammer, through the dimples and parts, all the way to the floor. If the C-frame does not have a table leg under it, the table will flex and you will get inconsistent results.
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  #8  
Old 07-11-2022, 10:32 AM
dwollen89 dwollen89 is offline
 
Join Date: Feb 2020
Location: Austin, MN
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Thanks. I did move it closer to the corner of my table, so that mightíve helped too. Such a learning processÖ
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  #9  
Old 07-11-2022, 02:20 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Dimplingyep

Quote:
Originally Posted by dwollen89 View Post
I think I figured it out. At the risk of feeling embarrassed, Iíll post my thoughts if itíll help someone in the future forum search. I think I was just hitting it too hard. I watched the Cleveland video again and reset my table and dimpled. I did the other side of the HS and just went about 1/2 to 3/4 force of what I was doing and they came out perfect. The only other thing could have been that my male die wasnít proud enough of the table as the distortions are convex on the finished surface. Maybe a combo of the two. Fortunately, itís on the bottom side of the HS, so nobody will ever see it. A wise tech adviser told me recently about 20 times that Iím building a tractor, not a watch. Iím constantly telling myself that to keep from going crazy, lol. Onward I goÖ
Yep. I ruined a top skin that way. Male die was just a little low. Don't worry about hitting it too hard. It's very difficult to hit too hard and easy to under dimple.
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Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #10  
Old 07-11-2022, 10:56 PM
RussellT RussellT is offline
 
Join Date: May 2016
Location: Albany Western Australia
Posts: 107
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Good to see you got it sorted and identified the issue early, donít worry my HS shows learning curve evidence too for those that know what they are looking at.

Most of mine were done on a concrete floor to avoid any bench bounce.

Russell
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