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About Mikey98118

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    Seattle, WA

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  1. Mikey98118

    Gas, dope, leaks, and questions

    Yes, even tiny leaks between the MIG tip and gas pipe will backfire, until they are completely sealed; it's kind of a drag.
  2. Mikey98118

    Triple Lined Forge!!?!

    Most casters put an emergency drain hole in the furnace bottom, to keep metal from creating a mess all over the furnace, in case of crucible failure. Such a hole also allows collected water and steam to escape during thermal cycling.
  3. Mikey98118

    Forges 101

    It should probably be okay on this issue. The tube will always expand faster and farther than the refractory does, creating room to vent steam. If there were end pieces on the forge shell, that would be more of a concern, and a vent hole would then be a good idea. As things stand, I think he's alright.
  4. Mikey98118

    Gas, dope, leaks, and questions

    Except for sealing leaks in the burners themselves. Minor leaks between MIG tip threads and gas pipes in burners will be drawn forward into the mixing tubes of some burners without harm, but will cause backfires in Mikey burners nearly every time.
  5. Mikey98118

    Troubleshooting new forge/burners

    If you look carefully at the MIG tip section of Ron Reil's site, and follow my directions there, your burners can be made very hot indeed.
  6. Mikey98118

    Gas, dope, leaks, and questions

    Agreed, as in totally! I have thought about this for years, and Frosty has it right.
  7. Mikey98118

    Troubleshooting new forge/burners

    The new photos show the MIG tips to be in the right place; I stand corrected. Not that they are in the best place, but they are as good as they can be positioned from a cross pipe.
  8. Mikey98118

    Troubleshooting new forge/burners

    It is a little hard to see clearly from the photo, but it appears that the cross pipe is too low in the reducers for MIG contact tips to be placed properly; the holes should touch the lip of their openings in order for there to be enough room for 1-1/2" long tips not to be within the mixing tube?
  9. Mikey98118

    Burners 101

    That is some nice work on your version of a Hybrid burner design. If is hard to judge the burner accurately without a flame photo, but two points jump out at me: First is that this size and type of burner normally runs best with a .023" MIG contact tip that is enlarged about .004" of an inch further with a wire file from a set of torch tip cleaners. .023" contact tips are just a little small for this burner, while .030" tends to be a little bit large. The actual orifice diameters are .031" and .038" respectively. The ideal orofice diameter should be about .035" Second is that tapered tips are tricky to get just right. I would suggest using the next size up schedule #40 pipe as your new flame nozzle's spacer ring, and the next larger pipe than that in stainless steel, or an equivalent in stainless steel tubing as the flame nozzle. Go for an overall length of 2". Use three stainless steel socket sets screws through the nozzle and spacer ring, so that your flame retention nozzle operates properly as a slide-over type, for flame tuning. I think you have done well so far, and if you'll hang in there, we can help get your burner running at maximum efficiency.
  10. Mikey98118

    Forges 101

    If that's what you want, I would suggest building a 3/8" size burner; these take a 1/2" size pipe or tube. You will find a cylinder-mount 3/8" Mikey burner a few pages back in Burners 101, or you can down size any other design you like instead. The point of stopping with this size is that, because the have such a long turn down range, going any smaller makes no sense.
  11. Mikey98118

    Forges 101

    It is always good to point out that what is needed to make a great little forge like this can be considered a minimum. While such upgrades as stainless steel burner heads, and special hoses to attached these burners to refillable propane cylinders can be added later on, if they are ever desired; some will want such upgrades, while others won't use a micro-forge enough to find them worthwhile.
  12. Mikey98118

    Forges 101

    As to your mistakes, there is an old saying; "If it's dumb and it works, then it ain't so dumb." At first I thought you had placed the burner port too close to the exhaust opening, but a second look makes me think that the exhaust blows out the large opening at the far end of the forge (its back), while work pieces are feed into the forge at it front. Normally the back end of a forge is sealed or only has a tiny opening, which would cause the exhaust gas to blow out the front opening past the work pieces. And--normally--that would overheat a brass burner head. What you have designed is not the most efficient forge, BUT IT SETS A NEW HIGH FOR PRACTICAL!!!
  13. Mikey98118

    Forges 101

    To begin with, congratulations on building such a hot forge. Great photos too. Please go into some detail on how you lined it. How long does it take to heat up, and what is the longest time you have run it for? That is the hottest micro forge I've ever seen running from a regular cylinder-mount burner
  14. Mikey98118

    Double burner gas forge

    The first time I saw burners placed high up on a side wall, and blowing flame horizontally across to the opposite wall, it was apparent that this is the way to go; it solves several problems that people get into with box forges. Unfortunately, it is the obvious way to go, and people have a lot of resistance to that
  15. Mikey98118

    My first forge build

    Before you turn that burner on and heat up the forge, I suggest that you break apart whatever refractory you filled the burner portal with. Few burners can combust their fuel completely in a primary flame envelope (using only the air/fuel gas mixture coming down their mixing tubes); all others need a secondary air source. Secondary air is drawn into the forge, through the burner port, by being induce from the flame. The only thing worse than excessive secondary air is none at all. When running, gas forges have internal atmospheres above the pressure of ambient air. No secondary air can enter the forge from exhaust openings; only from the burner portal, where induction can bring it in.