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Old 08-05-2017, 12:29 PM
birddog486 birddog486 is offline
Join Date: Mar 2016
Location: WI
Posts: 54
Default Dimpling with DRDT2

I'm using the DRDT2 and I'm curious if others experience this very small gap around the edge of the rivets as if the dimple is maybe to deep or the shape of the die has something to do with it.

After dimpling I have witness marks from the dies on both sides and using a razor shows the top of the rivet is flush with the skin, also I've tried using a very soft preload or enough I thought I would break the handle off but that doesn't change the shape of the dimple.

I've used the reflection test and the dimples seem to leave the surrounding skin very flat but I can slip a piece of paper under the edge of the rivet a couple thousandths before and after I set them.

I'll try to attach a pic but I'm not sure if it'll show.

Last edited by birddog486 : 08-05-2017 at 01:42 PM.
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Old 08-05-2017, 12:52 PM
pa38112 pa38112 is offline
Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 603

That does not look right. I would buy a new dimple set. It is not the DRDT2.
2004 RV6A Flying
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Old 08-05-2017, 01:04 PM
birddog486 birddog486 is offline
Join Date: Mar 2016
Location: WI
Posts: 54

I should have mentioned I'm using cleaveland dies and have several sets and many sizes and they all produce the same results. The reflection looks strange in the pic because of the angle, there is no noticeable skin deformation beyond the reflection.

The pic is zoomed in close trying to show the edge of the rivet. I cant catch a nail on the edge though.

I was able to get a clearer picture and replaced the one in the first post.

Last edited by birddog486 : 08-05-2017 at 01:44 PM.
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Old 08-05-2017, 02:15 PM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Los Angeles
Posts: 560
Default Pic

I am a newbie at this but thT looks like a dimple from tank dies or substructure dies

If you could see a part number on the die you could verify they are not one of these thpe.. you want to use regualr dies, not tank dies or substructure dies.
Also when you put a straight edge up to it., you shouldnt see light above the rivet.
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Extra dues paid 2018, worth every penny

RV9A- Status: tail feathers done less tips
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Fuselage 30%
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Old 08-05-2017, 04:18 PM
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Wunderon Wunderon is offline
Join Date: Jun 2014
Location: Seattle (Edmonds) and Iowa
Posts: 131

I like to see a witness mark on the surface for the die, perhaps try increasing the closure, 1/4 turn at a time?
Dave Grimmer
RV8 firewall forward
EAA 84 Edmonds WA
paid 2018
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Old 08-05-2017, 04:26 PM
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fl-mike fl-mike is offline
Join Date: Jul 2005
Posts: 986

how thick is that practice sheet stock?
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS
N184WM reserved (RV-8)....tail kit done, slow-build wing done, slow-build fuselage started.
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Old 08-05-2017, 05:33 PM
birddog486 birddog486 is offline
Join Date: Mar 2016
Location: WI
Posts: 54

The scrap sheet is .025 I have three sets of standard 3/32 Cleaveland dies and all three sets dimple like this. I have the DRDT2 screwed to the bench and I've gone from a light preload to setting it so tight I was afraid the handle would break and everywhere in between with no difference in the dimple.

I'm guessing I should contact Cleaveland about this. I've bought all three sets since November (I modified one set and another is in a holder for the rivet gun)

All the riveted pieces are fairly smooth and have minimal reflection around the rivets but I'm moving along fairly fast and figure before I'm done building I should probably have at least one perfect rivet.

The fuselage is scheduled to show up in about 5 weeks
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Old 08-05-2017, 07:56 PM
vluvelin vluvelin is offline
Join Date: Dec 2013
Location: Montreal
Posts: 199
Default Me too

have same issue on 2 sets
both Cleveland!
purchased 2nd set to compare and was thinking if 2 sets purchased 6 month a part are same it must be normal

I guess not!!

Can some one post nice clear picture how it should look
Thank you

2017 June RV7 Emp in works!
2014, 2015, 2016, 2017, 2018

Last edited by vluvelin : 08-05-2017 at 07:58 PM.
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Old 08-05-2017, 08:14 PM
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philcam philcam is offline
Join Date: Aug 2005
Location: DFW, Texas
Posts: 199

Have you tried using a squeezer instead of the DRDT-2 to see if you get the same results?

I have Avery dies and use the Avery squeezer, DRDT-2 and pneumatic squeezer and have good results with all 3.
Phil Campbell
Eagle's Nest Projects
VAF # 1043
Builder # 82699
DFW Metromess
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Old 08-05-2017, 08:43 PM
RussellT RussellT is offline
Join Date: May 2016
Location: Albany Western Australia
Posts: 39

Borrow a C Frame and try it with a reasonably lightweight steel hammer, you will probably see a nice difference. The sound will tell you. Cleveland dies are very good.

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