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  #1  
Old 08-22-2017, 11:41 AM
challinan challinan is offline
 
Join Date: Jun 2016
Location: Punta Gorda, FL
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Default Proper Riveting Technique

Hi Folks,

I am back to work after an 8-month delay (move, new job, new workshop.)

Having finished the VS and rudder, I'm working my way through the horizontal stabilizer. All of my rivets in the skin are leaving what look like tiny scratch marks on the skin next to the rivet hole. I am using a shiny new mushroom set - it has no scratches.

Is this normal/acceptable? If not, what might I doing wrong?

Picture link is here:
https://goo.gl/photos/56gyFd3ijFz7mUyS8

Thanks,

Chris
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* Donated for 2016, 2017
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  #2  
Old 08-22-2017, 12:22 PM
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bkervaski bkervaski is offline
 
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Totally normal .. you can use rivet tape if you want to minimize the burnishes .. but they will go away during paint prep.
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  #3  
Old 08-22-2017, 12:23 PM
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bkervaski bkervaski is offline
 
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Also, looks like you're over dimpling or possibly using the wrong die? The rivets should be flush with the skin, you shouldn't be able to see any of the dimple when you're finished riveting or even when you just set a rivet in to the dimple.
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Last edited by bkervaski : 08-22-2017 at 12:27 PM.
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  #4  
Old 08-22-2017, 12:42 PM
challinan challinan is offline
 
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The photo seems to over exaggerate the depth of the rivet. They are basically flush, maybe microns below the skin surface. After I use the dimple die, I received advice to very lightly run a countersink bit by hand to clean out the hold before bucking the rivet. That's what I've been doing. When I don't do that, sometimes the rivet sits high with a slight gap - I think I'd rather have the scratch than have the rivet sit high.

Any other advice appreciated

Thanks,

Chris
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* (VS and Rudder complete, HS in progress)
* Donated for 2016, 2017
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  #5  
Old 08-22-2017, 12:48 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by challinan View Post
After I use the dimple die, I received advice to very lightly run a countersink bit by hand to clean out the hold before bucking the rivet. That's what I've been doing. When I don't do that, sometimes the rivet sits high with a slight gap - I think I'd rather have the scratch than have the rivet sit high.

Any other advice appreciated

Thanks,

Chris
My advice is be very cautious doing this.
If you are dimpling properly with quality dimple dies, this should not be necessary.
The risk is that if you go just a thousandth or two, too deep, you could be setting rivets that are flush with the skin surface, but are not tight in the bottom of the dimple (not good from a structural standpoint).
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  #6  
Old 08-22-2017, 02:09 PM
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bkervaski bkervaski is offline
 
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Quote:
After I use the dimple die, I received advice to very lightly run a countersink bit by hand to clean out the hold before bucking the rivet.
Deburring takes place after you drill the hole, either for match drilling or final drilling. You wouldn't really want to debur after you dimple as there would be no way to get the dimpled side without affecting the walls of the dimple with the tool you are talking about.

We were also given that same tool for deburring and nothing wrong with using that tool, just conservatively and before dimpling.

I think you may be making a simple procedural error here .. debur before dimpling.

We ended up using these for deburring, a bit easier and they don't tend to take off a ton of material like the countersink bit will .. https://www.aircraftspruce.com/catal...?clickkey=9772
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  #7  
Old 08-22-2017, 02:10 PM
PilotjohnS PilotjohnS is offline
 
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Location: Los Angeles
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Quote:
Originally Posted by challinan View Post
The photo seems to over exaggerate the depth of the rivet. They are basically flush, maybe microns below the skin surface. After I use the dimple die, I received advice to very lightly run a countersink bit by hand to clean out the hold before bucking the rivet. That's what I've been doing. When I don't do that, sometimes the rivet sits high with a slight gap - I think I'd rather have the scratch than have the rivet sit high.

Any other advice appreciated

Thanks,

Chris
From the pic it looks like something is wrong with the dimple die. I would ask you contact a tech counslor in the area and have him take a look.
I never had to run the countersink in the dimple to get them flush. The only time i did this was when instructed. Sometimes the rivet appeared to be hi before setting. But they all came down once set. JMHO
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Last edited by PilotjohnS : 08-22-2017 at 02:12 PM.
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  #8  
Old 08-22-2017, 02:15 PM
challinan challinan is offline
 
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Thanks, Scott.

Andy advice for how long I should expect a good set of dimple dies to last before they should be replaced? They sure take a beating using the dead blow hammer and the C-Frame.

Chris
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  #9  
Old 08-22-2017, 03:58 PM
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rvanstory rvanstory is offline
 
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Smile

I had same issue on scratches. No big deal if you plan to paint as it will ALL get scratched prior to paint (scuffing), but still wanted it to look good in my garage while building.

Started putting blue painters tape on my mushroom set head. Last about 30-50 rivets between putting new tape on. No scratches. Keeps me happy.
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  #10  
Old 08-22-2017, 06:06 PM
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Blue painter tape on mushroom and

Black electrical tape on rivets and you will be pro
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