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  #11  
Old 01-20-2022, 09:07 AM
abwaldal@gmail.com abwaldal@gmail.com is offline
 
Join Date: Jan 2017
Location: Battle Ground WA
Posts: 465
Default Under dimpled

I agree with the poster that they are under dimpled. Period
Hit it harder, set tension more, what ever,
I'm in the camp of needing better dimpling.
These do not look good.
My three cents worth. Art
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  #12  
Old 01-20-2022, 09:08 AM
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agirard7a agirard7a is offline
 
Join Date: Aug 2009
Location: Newport, RI
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Default Dimples

Quote:
Originally Posted by Nova RV View Post
Just need more pressure on the DRDT. Get some scrap alum and make practice dimples in it and adjust until there is no dishing around the dimple.
The pneumatic squeezer, although convenient, does not provide enough force for a proper dimple. Re-dimple with a c- frame dimpler and you will see the diflection around the dimple go away. Or in your case, as mentioned, better adjusment on the DRD2
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  #13  
Old 01-20-2022, 09:11 AM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
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Default

My method for determining - hold the piece so a straight flourescent light reflects thru the dimple. If it looks distorted like a magnetic field drawing- it is UNDER dimpled. If it distorts & looks like a volcanic crater - it is OVER dimpled. If the light reflects thru as a straight line - repeat 14,000 times!

& my choice is a C-Channel with lots of practice.
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  #14  
Old 01-20-2022, 09:13 AM
ctremie ctremie is offline
 
Join Date: Apr 2021
Location: Sulphur La
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Default

Quote:
Originally Posted by Ralph Inkster View Post
My method for determining - hold the piece so a straight flourescent light reflects thru the dimple. If it looks distorted like a magnetic field drawing- it is UNDER dimpled. If it distorts & looks like a volcanic crater - it is OVER dimpled. If the light reflects thru as a straight line - repeat 14,000 times!

& my choice is a C-Channel with lots of practice.

Hey Ralph, Might these be over dimpled?
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  #15  
Old 01-20-2022, 09:17 AM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
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The ones in the light reflections are all UNDER dimpled.
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  #16  
Old 01-20-2022, 09:32 AM
mturnerb mturnerb is offline
 
Join Date: Apr 2015
Location: Jacksonville, FL
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Default

Cleaveland has some videos I found helpful:

https://youtu.be/Qo9QCMaNSoA

https://youtu.be/_mpbsQF1eu0
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Last edited by mturnerb : 01-20-2022 at 09:56 AM.
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  #17  
Old 01-20-2022, 09:46 AM
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Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
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I did my entire build with a DRDT-2 and Avery dies, and after adjustmemt saw no evidence of under-dimpled holes. I found the device should take some pressure to squeeze and “spring” back after applying the pressure. The whole point of it having that long arm is to allow you to give it enough pressure to produce good dimples.

I’m not flying yet, so who knows: all those rivets might fall out when I take off. But I believe the tool can produce good dimples.
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  #18  
Old 01-20-2022, 09:47 AM
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robertahegy robertahegy is offline
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Location: East Troy, WI
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I used a C-Frame for most of my dimpling and a pneumatic squeezer when possible due to location. I built my 4x8 foot work table with six 4x4 legs and 2x8 frame under the plywood and MFD top. It is very solid and allows for a good crisp hit without any bounce or deflection while using the C-Frame. I bought all my riveting and dimple tools from AVERY when they were still in business. Very quality dies and tools.

Deforming metal properly takes correct force and suddenness to properly upset the metal and conform with the shape of the dies. My point is if you aren't able to apply the necessary crisp, sharp blow to the tools, it will be very difficult to create a proper dimple. Using a C-frame requires a very solid table, or surface, so the energy in the hammer blow is not deflected from the work and gets absorbed in the table or work surface. This deformation is best accomplished with one crisp hammer blow with the correct force based on the metal type and thickness. Well made and properly shaped dies will also help.

Roberta
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  #19  
Old 01-20-2022, 09:59 AM
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N804RV N804RV is offline
 
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Cleveland "Spring-Back" dimple dies and the DRDT-2 worked just fine for me. - Its hard to over dimple, you just about have to be trying to do some damage. But, its easy to under dimple.
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  #20  
Old 01-20-2022, 10:20 AM
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bjdecker bjdecker is offline
 
Join Date: Jun 2005
Location: Georgetown, TX
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Default Test coupon

Pictures below

I use a DRDT-2 for large sheets, a CP214C clone for close quarter work. Built and flown a few RVs now using these tools and methods and none have had a failed rivet -- YMMV of course.

Dies are Cleaveland CAT 426-3, cleaned and polished.
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