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  #1  
Old 10-30-2017, 11:42 AM
Thunderpig Thunderpig is offline
 
Join Date: May 2017
Location: Titusville
Posts: 22
Default DRDT adjustments

Quote:
Originally Posted by Thunderpig View Post
Just posted a couple pictures of my about to be finished -10 HS and I am getting some comments on how I may not be "aggressive" enough. I am using an Experimental Aero dimpler with a dimple die set from Cleveland. Will try to get some pics posted on here...all arrows and suggestions are welcome.

Main question is, is there a difference in the die sets and just how tight can one go when dimpling. Not wanting to cause stress cracks...I am currently deburring and priming before dimpling.

http://cubeupload.com/im/Thunderpig/IMG0172.jpg

http://u.cubeupload.com/Thunderpig/IMG0173.jpg

http://u.cubeupload.com/Thunderpig/IMG0174.jpg

http://u.cubeupload.com/Thunderpig/IMG0175.jpg

http://u.cubeupload.com/Thunderpig/IMG0176.jpg

http://u.cubeupload.com/Thunderpig/IMG0177.jpg
This is a copy of a post I made in the Tools section...anyone have a DRDT and is there anyway to make these dimples more properly defined?
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  #2  
Old 10-30-2017, 11:47 AM
Nova RV Nova RV is offline
 
Join Date: Aug 2015
Location: Leesburg, VA
Posts: 150
Default

More pressure, a lot and they will form nicely. There is a video by Cleaveland tools on dimpling and getting crisp dimples. I watched it and went right to the shop and added a lot of pressure from my DRDT and the dimples improved 100%
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  #3  
Old 10-30-2017, 11:54 AM
FloMo14Builder's Avatar
FloMo14Builder FloMo14Builder is offline
 
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Location: Flower Mound, TX
Posts: 18
Default Pressure

Yep, I used a lot more pressure to the point that the DRDT arm deflects noticeably and I now get crisp edged dimples.
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  #4  
Old 10-30-2017, 12:38 PM
Thunderpig Thunderpig is offline
 
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Location: Titusville
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Default

Question is...is this a show stopper? I clearly haven't made perfect dimples, but structurally, I don't see a huge issue.
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  #5  
Old 10-30-2017, 01:34 PM
Dan Langhout's Avatar
Dan Langhout Dan Langhout is offline
 
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 387
Default 1 turn preload

My horizontal stab was just a bit "underdimpled" until I zeroed in on how to set up my DRDT-2. I was concerned at the time (cosmetically, not structurally) but it turned out to be a non issue.

I used 1 turn pre-load for all the rest of my build - worked great! 1 turn pre-load defined as one additional turn of the adjustment screw from the point where the two bare dies touch each other (no material between the dies). As others have pointed out, in use there is a noticeable deflection in the upper arm of the tool when dimpling.

You might take a look at this post http://www.vansairforce.com/communit...07&postcount=3 that I made back in 2009. It has photos of test dimples I made with the DRDT-2 and pneumatic dimpler using different preloads.
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  #6  
Old 10-30-2017, 01:57 PM
BrianDC BrianDC is offline
 
Join Date: Mar 2016
Location: Northern VA
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No, this is not a structural issue, but a cosmetic one.

Agree with the others that your dimples appear to be slightly under dimpled. Honestly not a real problem, just a "look" thing.

Here is the cleavland tool video being discussed:
https://youtu.be/Qo9QCMaNSoA
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  #7  
Old 10-30-2017, 02:34 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Structural

Quote:
Originally Posted by BrianDC View Post
No, this is not a structural issue, but a cosmetic one.

Agree with the others that your dimples appear to be slightly under dimpled. Honestly not a real problem, just a "look" thing.

Here is the cleavland tool video being discussed:
https://youtu.be/Qo9QCMaNSoA
Just a little point.
It shouldn't be structural but if the dimples don't nest in the substructure and parts have a gap, it can be structural.
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  #8  
Old 10-30-2017, 03:20 PM
BrianDC BrianDC is offline
 
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Quote:
Originally Posted by wirejock View Post
Just a little point.
It shouldn't be structural but if the dimples don't nest in the substructure and parts have a gap, it can be structural.
Good point, but not specifically a symptom of a consistently under-dimpled parts. Inconsistent dimpled parts would show this behavior, or insufficient countersinking.

Gahhh!!!! I'm no expert, I just play one on the internet, and why I suggested an EAA counselor give a visit in the other thread.
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  #9  
Old 10-30-2017, 03:33 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Good point

Quote:
Originally Posted by BrianDC View Post
Good point, but not specifically a symptom of a consistently under-dimpled parts. Inconsistent dimpled parts would show this behavior, or insufficient countersinking.

Gahhh!!!! I'm no expert, I just play one on the internet, and why I suggested an EAA counselor give a visit in the other thread.
Yes. Exactly. I should have made that clearer.
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Donated 12/01/2016. Plus a little extra.
RV-7A #73391, N511RV reserved (1,800+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
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 10-31-2017, 09:09 PM
MJarreau MJarreau is offline
 
Join Date: Apr 2007
Location: LA (Lower Alabama)
Posts: 196
Default What is Preload?

I'm not exactly the most mechanical person in my family.

Ok, so I just re-read Dan's post. Does "one additional turn" mean putting the dies closer together?

Thanks!
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Last edited by MJarreau : 10-31-2017 at 09:11 PM. Reason: Re-read posts
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