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Propane and MAPP

  1. #1
    aldra JIDF Controlled Opposition
    Anyone know if you actually can use a propane torch with MAPP (MAPP-type I guess, the original MAPP mixture isn't produced anymore) gas? The connector is the same, there are warnings not to do it but I've looked online and the complaint just seems to be that MAPP burns hotter so it might overheat the tip.


    I want to try out MAPP because it's difficult to keep a large piece of titanium red-hot with the propane torch, but I don't want to spend another $80 or so on a torch head I probably don't need. I also don't want to blow up a MAPP canister and have to be in hospital for a week while they fish pieces of canister out of my chest cavity.
  2. #2
    stl1 Naturally Camouflaged
    I own a combination propane/MAPP torch. All you need to do to switch is to replace the orifice. I believe the MAPP is a smaller orifice but I don't remember for sure because I haven't used it for MAPP in years as I own an oxy/acetylene torch.
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  3. #3
    aldra JIDF Controlled Opposition
    when you say orifice, do you mean the connector on the top of the canister? because I know both the propane and MAPP tanks I can get from the hardware store have the same.
  4. #4
    aldra JIDF Controlled Opposition
    FYI I'm blasting titanium knife parts with a torch and quenching them in cooking oil in order to blacken them, will post pictures later
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  5. #5
    Soyboy 2020 IV: Intravenous Soyposting African Astronaut [scrub the quick-drying deinonychus]
    Originally posted by infinityshock lovingly lambasted lannys longing loose labia like the liberal little laotian ladyboy he loves larping like, leaving the little lads larynx lacerated and laryngitic-(banned) I will confirm that the yellow canisters with the false term 'MAP' are NOT MAPP gas. The first time i realized it was when I was soldering some copper pipe joints then after swapping the yellow tanks from MAPP to MAP that the time to make the solder flow was noticeably longer.

    They continue to sell yellow canisters because the profit margin is exponentially higher. There is no noticeable difference in time for melting something between using a yellow canister and a blue propane canister.

    You won't blow up a yellow canister. Theyre designed to work with anything with a compatible attachment fitting.

    Buy a cheapo harbor freight torch….the big one…for like $30…hook it to a 20lb propane tank…then surround the knife in firebrick to keep the heat somewhat focused.

    I use a similar method….cept with an actual furnace…to melt aluminum and copper. I just use a literal cooking pot to melt lead.

    Save
  6. #6
    There's not a single hair out of place on my body. And yes I do have a MAPP gas tattoo and no you can not see it. Sibscribed to an Aldra tphthread
  7. #7
    aldra JIDF Controlled Opposition
    I meant to take some photos of the actual process but I forgot how hard it'd be to hold the metal in one hand and torch in the other and take photos.

    In order to get a nice, dark finish you need to get the metal glowing-hot and then quench it (a few times). The problem I had was that even though this was a small knife, I couldn't get the whole thing hot enough before one end cooled down. So I heated in three zones, ie. get the top red hot, dip it, get the middle red hot, dip it, get the bottom red hot, dip it, repeat. I was afraid it'd come out uneven, but I actually like the finish - it looks like a solid dark grey until the light hits it, then it's kind of like a galaxy or clouds at night:


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  8. #8
    aldra JIDF Controlled Opposition
    Oxidising in this case, I normally prefer to electrically anodize it but I don't know of any other way to get a black finish without harsh chemicals.

    And yeah I'd be worried about the strength of the metal if it were part of a plane or submarine, not so much in this case. I was concerned it might warp but I don't think I got it hot enough for that
  9. #9
    why not just use metal niggering paste ?
  10. #10
    aldra JIDF Controlled Opposition
    bluing? I can't find it anywhere and I don't think it works on titanium


    on topic, windex tastes like soap

    also on topic, sanding by hand is a bitch. tempted to get a sandblaster but then I need a tank to do it in
  11. #11
    CASPER Soldier of Fourchin
    In b4 wariat comes in to declare MAP pride
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  12. #12
    aldra JIDF Controlled Opposition
    I don't even think he did anything all that bad, just the way he posts makes me want to step on him
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  13. #13
    netstat Tuskegee Airman
    Pretty sure the yellow bottles are just propylene now, burns maybe 5% hotter than propane so you wouldn't have a problem using it with a standard torch head, but it probably wouldn't be noticeably more effective either.
  14. #14
    aldra JIDF Controlled Opposition
    I ended up buying a cheap MAPP head, haven't tried using it yet. will test and see if my propane head works OK with it because it's better quality.

    https://www.bunnings.com.au/tradeflame-tf-ultra-gas-performance-gas-mapp-replacement_p5910238

    that's the gas, sold as ULTRA/MAPP replacement
  15. #15
    aldra JIDF Controlled Opposition
    also I'm planning on trying a new finish - I'll do as above to get the piece nice and black, then sand the edges raw and then electro-anodize it. If it works it should look like Tron or fucking Battlezone or something. If it doesn't work I huff the tank and burn my apartment down.


  16. #16
    Originally posted by aldra bluing? I can't find it anywhere and I don't think it works on titanium


    on topic, windex tastes like soap

    also on topic, sanding by hand is a bitch. tempted to get a sandblaster but then I need a tank to do it in

    yea i thot it works on all metal.

    also to heat your knife evenly just surround it with bricks or just dump it in a pile of bbq charcoals.

    and sanding with wire wheels and dremel is pretty much effortless for knife sized objects.
  17. #17
    stl1 Naturally Camouflaged
    Originally posted by aldra also on topic, sanding by hand is a bitch. tempted to get a sandblaster but then I need a tank to do it in



    How about a wire wheel? I have a 6" one attached to an old furnace blower motor and mounted to my workbench. Just make sure that you get a mandrel that won't losen the threads in use.
  18. #18
    aldra JIDF Controlled Opposition
    Originally posted by infinityshock lovingly allowed lard-ass lanny the luxury of lapping the loins-leviathan while the little lad larps as a laotian ladyboy lapdancer............................................................................ (banned) there is no MAPP.

    yeah I know, I mentioned this already, supposed to be a similar mix, burns around the same temperature. propane canisters are about $2 cheaper.



    Originally posted by stl1 How about a wire wheel? I have a 6" one attached to an old furnace blower motor and mounted to my workbench. Just make sure that you get a mandrel that won't losen the threads in use.

    Yeah I use one in the beginning (attached to a drill press) but still need to sand by hand afterwards to get a smooth/consistent finish
  19. #19
    aldra JIDF Controlled Opposition
    I was going to buy chemicals to blue both regular and stainless steel from Caswell but they wanted to charge me $105 for a hazmat courier so they can get fucked.

    I ordered some of this off ebay to experiment with (the 'super' is supposed to be the niggliest they sell), as well as the cleanup/protector kit to experiment with.

  20. #20
    aldra JIDF Controlled Opposition
    Oh yeah I'm gonna try and go solid black and brass with this one (hopefully I can darken the blade enough):



    I considered buying some copper/brass LSCF but I know I'm going to fuck up making the scales and waste the money on the material

    I want it to look sort of like the REATE blackout models:





    FYI that's a Chinese company that does some pretty high-end manufacturing
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