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About tinkertim

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    Bristol, England
  • Interests
    Electronics, Mechanics, Robotics, KnifeForging, reverse-engineering.

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  1. I thought the Silica micro bubbles wouldn't melt as long as they were not on the flame face. I guess either silica micro-spheres or voids where micro-spheres used to be are both going to have pretty much the same effect; they make an insulating refractory. I just need time and bits to play with. Tink!
  2. Cool! Thanks Lou, I'll look into that. Tink!
  3. Thanks for the suggestions Frosty, I'll do some local hunting. Tink!
  4. Interesting! I bought a small bag of Perlite in a garden center last weekend, to use as an insulating bed for slow-cooling of blades, annealing, etc. Would it be up to welding temperatures if mixed with a high alumina refractory?
  5. Hi Mikey, I had come to the same conclusion. I have seen sites selling many of the individual constituents, and I believe its the glass micro bubbles that make the refractory an insulating refractory. If I can find places that will sell small amounts to experiment with, then I'll have a play. I'll post up my findings, as and when. Tink!
  6. When they talk about a colloidal silica slurry, I believe it contains more that just Silica & water, as it also frequently mentions "binder" in various slurry descriptions. I think what confused me originally is where various products refer to colloidal silica, but some are referring to a pure dry powder and others are referring to a suspension of colloidal silica (potentially with other chemicals/minerals also included in it). They are definitely not the same thing. When I place an order and start my build I'll take loads of piccys for reference purposes. It probably wont be for a few weeks though. Thanks for the help Dan, I'll keep you posted. Tink!
  7. Hi Dan, I like it when someone gathers experimental evidence, with for & against examples, and gives reasoned analysis and logical conclusions. It ticks all my nerdy engineer boxes! It's quite difficult to find companies who will sell smaller amounts of materials and stock in or ship to the UK. (Kastolite-30 being my biggest headache!). Here are the [Google searches I used to find] the materials I can get shipped in the UK that I'm going to experiment with: GOOGLE: mbfg fumed silica GOOGLE: scarva en gb zircopax GOOGLE: ulster ceramics morisol x30 It's not clear whether the Morisol-x30 is in powder form or a ready-to-use liquid, but as it does come in 1Litre, 5Litre, etc. I think it should be liquid. Catch you later, Tink!
  8. Hi Dan, It sounds like you've done some really useful comparative tests, and following your reasoning & observations, I agree with your conclusions. I've found somewhere I can buy small amounts of colloidal silica slurry, as well as Zircopax and the fumed silica powder, so I'm going to get some of each. As you and others have done, I'm going to use the fumed silica powder & water for the rigidising, and then use the slilca slurry & Zircopax as the hardened hotface. Thanks for clearing up my confusion with the different types of Silica products. I feel I can source the right kinds of materials now. I'll keep you posted when I start my new small Butane tank forge build (once I can find where I put the empty tank!) Cheers, Tink!
  9. This is the thing that was confusing me a little, as numbers of people appear to be using "Fumed Silica" powder mixed with water as a rigidizer on their ceramic blanket, and heat it up to set it, before laying on their insulating refractory coat. Dan, are you saying that when you have tried this it ate your ceramic blanket, or only when you mixed Zircon flour and colloidal silica powder, added water and then coated your blanket it ate the blanket? Hmmm. Tink!
  10. Hi Dan, I can get some Zircopax (Zirconium Silicate powder) in the UK, and I've found Colloidal Silica as powder for adding to Epoxies as a thickener. It's not clear from your reply how much or what ratio I might mix these two, before mixing up a slurry with water. Also it sounds like you are accelerating the hardening of each coating with heat. Is this just putting the propane on low for a couple of minutes every 15mins or so, or do you have a different method? I'm happy to take my time and have a play, but don't want to ruin my ceramic blanket before I get to use it in anger. Tink!
  11. Hi Dan, "Using a mix of zircon flour and colloidal silica". Was this a 50:50 ratio of some other combination? I'm interested in doing some "Tinkering". Tink!
  12. tinkertim

    Naturally Aspirated Ribbon Burner. Photo heavy.

    Wow JHCC! That looks like an epically bonkers musical instrument! The video of the "Gas Organ" sounded quite disturbing . . . . . . I love it! Thanks for that, It just made my day! Tuneful Tink!
  13. tinkertim

    Naturally Aspirated Ribbon Burner. Photo heavy.

    Hi Dan, Your open-air test of your latest multi-hole burner looks really good! Nice even, quiet flames at low PSI and seems to have a good turn-down, but still a screamer at higher PSI. Very nice! Re. the tuneful forge, I think you need to have multiple levers from inside the forge to outside, so as you play the external keys, various holes on the burner get blocked. You have then got the world's first Forge Organ! Congratulations! You just need the striking-anvil chorus as accompaniment! Tink!
  14. tinkertim

    Naturally Aspirated Ribbon Burner. Photo heavy.

    Well it was an interesting excercise, and I'm certain it wasn't tuned for maximum output, but I was just trying to get some comparative numbers. Sound pressure is measured in Decibels, which is a logarithmic scale, with every 3db increase meaning a doubling in sound pressure. I don't know if the camera on my phone picks up more IR than it should, but after ~10 mins the interior of the forge looked a high yellow and not a "screaming" white heat. The interior of my IFB forge is only a little bigger than a single IFB brick, so it is not a big volume, so I didn't feel the need to take it to higher psi for comparative testing. The reason I posted up the videos was so you could hear the difference in sound (best with headphones). I have taken some audio WAV recordings to analyse later, as I'm curious as to whether the extra volume happens at higher frequencies. I'll post results as and when. Owen, I'm note sure what you mean regarding "a metal box around the burner port". Do you mean inside the forge? Could you sketch something? Also could you also post a piccy of your Amal venturi position (assuming you have a 3/4" one around)? Anyway I hope these observations have helped. Tink Out!
  15. tinkertim

    Naturally Aspirated Ribbon Burner. Photo heavy.

    OK Owen ( @basher ) et al. I've done some initial testing of my Amal 3/4" Propane injector (with a default 110 jet), to try and get some idea of the difference in sound level between the Multi-port Ribbon-style burner (NARB), and the Single-port burner configuration when used in the same forge at the same Venturi and PSI settings withing a few minutes of each other. I used an Android App on my old Galaxy S2 called "Sound Meter" to take sound pressure readings. The microphone was setup ~1metre away from the forge in all measurements, and I let it take an average reading over ~10 seconds for each measurement. With each burner config I did measurements at 5psi and 10psi, just to get a comparison. NARB at 5psi = 64db, at 10psi = 67db Single-Port at 5psi = 70.5db, at 10psi = 74.5db At each psi, the Ribbon burner was considerably quieter (where a 3db increase corresponds to a doubling of the sound pressure), with the Single-port configuration being over 4 times as loud as the Ribbon burner at the same settings. I was quite surprised that it was so marked, but it was interesting doing some back-to-back testing. It's confirmed to me that I'll be concentrating on NARBs in the future, as it is not just quieter, but seemed to give a more even heating effect within the forge. The Amal Venturi was set as shown in this picture. Video clips: MultiPort_5psi_64db https://youtu.be/xJiSyTQ0f1Y MultiPort_10psi_67db https://youtu.be/UrH1AaiS9k0 SinglePort_5psi_70p5db https://youtu.be/19BUpZXBtwU SinglePort_10psi_74p5db https://youtu.be/vSaX-Rp3dRo Tink Out!