This is way off topic but we all like rivetting, don't we?
Does anyone have a formal process description of the setting procedure for chobert rivets? I've scoured the web and have only found 2 references
- a GKN list which is just headings and no further links, and a SAE site where they want lots of dosh for a download. I've found the Cherry
datasheets that describe hole diameter and 'grip' lengths but no further process details.
I need to fit some, have experimented and I'm happy with the results but I have to convince the 'man' that it's been done properly
(can't go into detail!)
For info, choberts were invented in the 1930s and used extensively in WW2 and post war aircraft and are now widely used for rapid production in things
like racking. They are fast fit blind rivets, sometimes known as speed rivets designed to be fitted by unskilled operators. Unlike pop rivets they
are fitted by pulling a re-usable mandrel through the rivet which expands the rivet to fit the hole leaving a hollow fixing which can be filled with a
tap-in pin to make effectively a solid rivet. They're usually installed with rapid fire air guns using colletted rivets but it can be done
manually as a single rivet with the right gun.
There's a few videos on youtube.
I know but I don't think the authority will accept a video.
Considering the comments made about when they were invented and original use, have you tried contacting a group who maintain / restore historic
aircraft?
If that doesn't work, try a science museum perhaps.
quote:
Originally posted by JeffHs
I need to fit some, have experimented and I'm happy with the results but I have to convince the 'man' that it's been done properly (can't go into detail!)
Here is a link for hole sizes etc if it is any use:
https://www.baysupply.com/ASSETS/DOCUMENTS/ITEMS/EN/BA-01122-00404_SpecSheet.pdf
Not sure that is really what you wanted though.
Regards
Hugh
Thanks for all the responses. I agree entirely with Mr Whippy's comments re fitting and I have a good relationship with my inspector, but we're struggling against the bureaucratic juggernaut. What I'was tying to do was find a formal document that I can wave under their noses to help them make a decision.
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http://www.avdel-global.com/fileadmin/user_upload/Data/PDF/Product_Flyer/EN/Double_Flush_Chobert_EN_NA.pdf
https://appianfasteners.com/media/downloads/7537.pdf