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-   -   Setting Cherry Max Rivets (https://vansairforce.net/community/showthread.php?t=157231)

DHeal 01-25-2018 08:53 PM

Setting Cherry Max Rivets
 
FYI -- A new video from Van's regarding the setting of Cherry Max rivets at:

https://www.youtube.com/watch?v=lb9miRllZDo

rv9builder 01-25-2018 10:52 PM

Thanks for posting the link, David! Looks like a great tip. Is there a place on Van's website where videos like this are posted?

mike newall 01-26-2018 03:34 AM

They have a channel

https://www.youtube.com/channel/UCLY...j1kbl33Z5NOshg

rv9builder 01-26-2018 02:20 PM

Quote:

Originally Posted by mike newall (Post 1235004)

Thanks, Mike!

philcam 01-31-2018 05:40 PM

Anyone else at this stage yet? I?m having horrible luck with theses rivets even following the video, only about 1 in 3 rivets are acceptable.

Walt 01-31-2018 05:47 PM

It helps to use a cherry max puller, standard pop rivet pullers don't work very well on CM.
http://www.aircraftspruce.com/catalo...php?recfer=505

Crafting N112DR 02-01-2018 07:22 PM

Having a lot of trouble too, even using a cherry max hand puller. I tried the Van way of lubing the stem but no joy. Have had to order more. Thinking of going to find a pneumatic cherry max puller.

DHeal 02-01-2018 07:36 PM

Just as a reminder, the Cherry Max rivets look different from standard pull-rivets after installation. See Van's Chapter 5 - Page 05-07 for photos of Cherry Max rivets at: http://www.vansaircraft.com/pdf/revisions/RV-ALL_05.pdf

I know it took me awhile to adjust to the appearance of the shop end of a successfully pulled Cherry Max rivet.

rvsxer 02-02-2018 06:31 AM

Here is a good explanation of how CherryMax Rivets work, and what happens when one is properly set. http://www.cherryaerospace.com/docs/...gs/CA-1011.pdf
Before the CherryMax blind rivet was introduced, The CherryLock rivet was the structural blind rivet of choice. The main drawback to the CherryLock rivet was the requirement for a specialized, expensive puller that would set the mandrel lock ring during the pulling process. This lock ring is important as it positively locks the mandrel in place and allows the rivet to develop design strength. The CherryMax rivet uses a washer ("anvil") to set the lock ring, so a standard "pop rivet" puller can usually be used to set them. This is one reason why CherryMax rivets are approved on Standard Category aircraft size-for-size with solid rivets.
To easily remove a CherryMax rivet, the lock ring should be ground away, with a pencil grinder or a high-speed grinder and cutoff wheel. The (usually steel) mandrel can be driven out and the rivet head drilled as with a solid rivet.

AaronG 01-26-2020 02:51 PM

Thought I would share my experience setting the CR3213-4-08 cherry max rivets on the RV12is fueslage spar assembly. For starters, I have set many cherrymax rivets over the years with zero issues. I have the cherrymax hand tool, and lubricated the rivets like in the video. Despite all of this, I was getting maybe 1 in 4 rivets to set properly. Finally walked away and decided to order a new batch of rivets. Not cheap, but was able to get them for $1 each when ordering 50 through Aircraft Tool Supply.

Rivets came today. Not a single failure with the new batch, setting 30 rivets. What a difference, much to my relief. Not sure why a different batch mattered, but it did. Visually, I could not tell the difference between the two. So if you are following the video and still having issues, try ordering another batch from a different source.

One other comment, for those who are not familiar with a properly set cherrymax, make sure you learn and check these rivets. They need to be properly pulled and locked to get full strength.


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