Back To dimples again!!!

[vluvelin]

Was not happy with my dimples with DRDT-2 and (dies from popular store 426-3 )
1) fit of rivet in dimple is not complete
2) dimple not crisp not well defined
3) nesting
Many people suggested C-frame makes it much better tried that no difference in results (for me).

NOTEs
1) Dies are not defective purchased 6 sets in total during 2 years period.
2) Reason for this post is to understand if
I have no knowledge in the subject ( most likely)
or
developer of this dies didn't spend enough time to tune them
or
because they try 1 size fit all solution


Please review and comment. I am new guy in aviation and hold only home school diplomas in everything I do. So please don’t shoot!!!

Here is dimple I managed to get using DRDT-2 and Modified dies
Material .032
DRDT2 preload material thickness - 1.25 turns
Drill bit used #40 Double margin
Hole final size Original dies 2.65mm -.104 Modified dies 2.70mm -.106
sorry fill better in metric














Modified dimple rivet fit


Modified not deburred

[vluvelin]

Modified Bottom and top



Original Bottom and top

[bkervaski]

Wow. You are DEDICATED to your new craft, sir! All I did was go look at the planes at the airfield and my dimples looked like they did so I went with it.

[vluvelin]

AATD decease

Additional
Attention
To
Details

[terrye]

1. You don't say how you "modified" the dimple dies, please elaborate.
2. The modified die holes look much bigger than the .001" difference in your opening post. Did you measure them with a digital caliper?
3. The photos are great. What kind of 24x graduated magnifier did you use?

I used the Cleaveland dimple dies with a pneumatic squeezer and with a C frame. Used the latter with two heavy hits with a dead blow hammer and am quite happy with the results.

Using the same dimple dies for a skin and a rib, the two parts will never nest perfectly, but after setting the rivet they will be "close enough".

[climberrn]

Might want to try some different dies. Could you possibly borrow some to test out?? The DDRT takes all the guesswork out of it.

[60av8tor]

I'm a broken record on my allegiance to the c-frame - used it on every dimple that I could fit. I also own a DRDT that was only used during my practice kits. I was never satisfied with the results. I will say, that it must have been user error, as so many people are happy with it. I just got tired of messing with it when my c-frame results were so nice. One thing I've seen routinely - now that I somewhat know what I'm looking at - is underdimpling. I've seen videos of folks hitting the c-frame with barely any force and you glance down the rivet line and see all kinds of light bending around the rivets. I used a metal claw hammer - smaller one (not sure of the weight; not at home right now), and gave 3, not so gentle smacks for each hole. You can hear, and even feel, when the dimple is fully formed. Doesn't take long to get the feel and get into the groove with excellent results. I really like this video from Mike at Cleaveland

https://m.youtube.com/watch?v=Qo9QCMaNSoA

Oh yeah - I also only used Cleaveland's dies.

[rv7charlie]

+1 on retry with different dimple dies. For absolute best results, make sure that they are 'spring back' style dies (though you can get decent dimples with standard dies).

The topside views of all the images have the look of an underdimpled operation, but the bottom views all look like you got a nice crisp dimple. That's why I'd try a different set of dies.

And FWIW, more expensive stuff has to work better, because you paid more for it, right? ;-) You can get perfect dimples with a C-frame & a heavy mallet (and good dies).

Charlie

edit: Jon posted while I was typing; good info from him. I used a fat rubber mallet instead of a hammer or dead-blow. One medium whack to start, then a serious whack like driving a 20d framing nail. (You really can't hit it too hard, using a soft face mallet.)

[DaleB]

I can second the Cleaveland die suggestion. I was surprised at how much difference they made over the other set I had been using. I used a C-frame with a 2# dead blow mallet, 2-3 good hard whacks.

[vluvelin]

Originally Posted by 60av8tor

I'm a broken record on my allegiance to the c-frame - used it on every dimple that I could fit. I also own a DRDT that was only used during my practice kits. I was never satisfied with the results. I will say, that it must have been user error, as so many people are happy with it. I just got tired of messing with it when my c-frame results were so nice. One thing I've seen routinely - now that I somewhat know what I'm looking at - is underdimpling. I've seen videos of folks hitting the c-frame with barely any force and you glance down the rivet line and see all kinds of light bending around the rivets. I used a metal claw hammer - smaller one (not sure of the weight; not at home right now), and gave 3, not so gentle smacks for each hole. You can hear, and even feel, when the dimple is fully formed. Doesn't take long to get the feel and get into the groove with excellent results. I really like this video from Mike at Cleaveland

https://m.youtube.com/watch?v=Qo9QCMaNSoA

Oh yeah - I also only used Cleaveland's dies.

Could you please post high res picture of your dimple Cleveland 426-3 and C-farme?