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Old 11-30-2012, 10:15 PM   #1
myaddress2020
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Default hot riveting

hello all
i wonder if anyone out there has ever hot riveted new "roller tracks" on a model A, brake, back plate? the tracks come with a jig to hold one side of the rivet.
the way i understand it i could use a propane torch to get the rivet red hot, then pick up a lump hammer and beat the rivet into a mushroom, but i didnt know if i should have a tool to hit the top of the rivet, with a mushroom shape in it.
Vince
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Old 11-30-2012, 10:34 PM   #2
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Default Re: hot riveting

Tool for the hot end not needed, heat cherry red and peen it.
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Old 11-30-2012, 11:13 PM   #3
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Default Re: hot riveting

ok i gotcha.
im thinking its better to heat the rivet seperated from back plate and when its red, grab and slide the plate with roller track over the top of the rivet. this way i wont heat the plate and track unnecessarily. will the rivet have expanded stopping me from doing that?
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Old 11-30-2012, 11:42 PM   #4
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Default Re: hot riveting

if you concentrate your heat on the rivett it will not transfer to the backplate. no worries heating them together. i use the rivett tool in my impact gun and they come out looking like original.
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Old 12-01-2012, 11:40 AM   #5
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Default Re: hot riveting

If no impact tool available, Model A vendors sell a hand held Rivet Upset Tool that one hits with a ball pein hammer to provide a neat round head.
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Old 12-01-2012, 12:45 PM   #6
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Default Re: hot riveting

I found that a propane torch is not sufficient. You need oxygen/acetylene. The backing plate acts like a big heat sink. Also if your holes are the proper size you cannot heat the rivet then insert it into the backing plate. The rivet expands just enough to prevent that.
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Old 12-01-2012, 04:54 PM   #7
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Default Re: hot riveting

i think i just found that out about the propane. my uncle is a heating guy and he uses acetylene to sweat pipe. there isnt an oxy cylinder with it. just the ac i guess.
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Old 12-02-2012, 07:59 PM   #8
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Default Re: hot riveting

does any one know if you should use acetylene alone or with oxygen when hot riveting roller tracks on?
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Old 12-02-2012, 08:20 PM   #9
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Default Re: hot riveting

If you use only acetylene, you will get lots of smoke, particles floating around and a very cool flame. You have to have oxygen to get a very hot flame. I think what your uncle was using was Mapp gas. It is similar to propane, but produces a hotter flame (no additional oxygen needed). I am not sure Mapp gas would produce a hot enough flame to get the rivet cherry red.
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Old 12-03-2012, 09:23 AM   #10
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Default Re: hot riveting

Definitely oxy/acetylene to heat rivets cherry red, on the parts to be assembled. Use two people - one to work the torch, one to mushroom the rivet. Do it in two steps instead of all at once for a more controlled process.
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Old 12-03-2012, 07:57 PM   #11
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Default Re: hot riveting

You really can't burn just acetylene. It's not hot enough and it will choke you . . dirty soot everywhere.
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Old 12-03-2012, 08:21 PM   #12
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Default Re: hot riveting

Just to clarify "burning", you will get a yellow, sooty flame from propane and mapp as well as acetylene if burned in free air with no added air or oxygen in the mix. The propane and mapp torches use the venturi principle to suck air into the mix. There are lots of acetylene/air torches out there too, and they mix in air the same way, giving an adiabatic mix that produces a nice blue flame, about 4,350F, much hotter than mapp. I have one attached to a prestolite tank, used it for years for brazing work on heavy silver. It will make a steel or wrought iron rivet bright orange quickly and easily. What you will not get from any air/fuel torch is the pinpoint inner flame needed for puddle control in welding. That requires pure oxygen in the mix.
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Old 12-04-2012, 09:41 AM   #13
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Default Re: hot riveting

did the job yesterday with my friends oxy acty torch. worked fine. i think mike here is right, you can do it with just acetylene. the oxy is needed if you are welding and need that pretty puddle. thank you everyone.
Vinny
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Old 12-04-2012, 10:09 AM   #14
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Default Re: hot riveting

I have been using this inexpensive Bernz=O-Matic oxygen/map gas torch for years for welding brazing and heating rivets cherry red, Works like a dream using inexpensive replacement cylinders.

http://www.bernzomatic.com/item.html?id=30
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