Concerned about under dimpling, Please let me know your thoughts

ctremie · #1 01-20-2022, 07:55 AM

I have a DRDT-2 , with dimple dies from ISham (Planetools.com), I have the drdt-2 setup to flex about 1/8th of an inch at the bottom of the stroke. But I am concerned about the dimples looking under dimpled. Thoughts?

Different dies maybe>?

rvbuilder2002 · #2 01-20-2022, 08:06 AM

I most definitely see under formed dimples.
It could be caused by the dimple dies, but in my opinion, the DRDT-2 is always going to produce dimples of lesser quality than other methods.

Nova RV · #3 01-20-2022, 08:17 AM

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.

ctremie · #4 01-20-2022, 08:22 AM

The edges where done with Rivet Squeezer. What method do you like best?

ctremie · #5 01-20-2022, 08:23 AM

Thanks Chris will try

ctremie · #6 01-20-2022, 08:41 AM

Straight on they look good but when you get a distance away they seem to distort, is this normal

wirejock · #7 01-20-2022, 08:41 AM

The dimples near your hand look better but still under. The ones at the top are very under dimpled.
I see no burnish marks. You may want to try some Cleveland dies.
I prefer a C-frame.

Bavafa · #8 01-20-2022, 08:58 AM

They are certainly under dimpled or not nearly as crisp of a dimple as they should be and I am with Scott 100%
You seem to be at the early stage of your build so still ways to go. It would be worthwhile to spend the $$ and time on a good dimpler and a good table/platform for it.

Pdp7427 · #9 01-20-2022, 09:00 AM

I’m FAR from any kind of expert. How do your dimples compare to the examples in the standard aircraft handbook or in the FAA Inspection and Repair Alterations book? I’m trying to reconcile why all of the books seem to prefer a dimple that only just accepts a flush rivet flush to skin while the forums always seem to prefer a deep dimple…?

Trying to learn myself.

ctremie · #10 01-20-2022, 09:07 AM

Quote:

Originally Posted by Bavafa

They are certainly under dimpled or not nearly as crisp of a dimple as they should be and I am with Scott 100%
You seem to be at the early stage of your build so still ways to go. It would be worthwhile to spend the $$ and time on a good dimpler and a good table/platform for it.

So is the DRDT-2 and Isham Dimple dies not good? I also have it mounted on EAA workbench. What is your recommendations