I got my peening braves on yesterday (Primus 96 & Optimus 100)

Discussion in 'Fettling Forum' started by Tony Press, May 30, 2016.

  1. Tony Press

    Tony Press United Kingdom Subscriber

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    Having just fettled a Primus No. 96, and putting up with the fact that the flame was fairly yellow on the tips, but still worked OK, I began to fettle an Optimus No. 100.

    Now the Optimus 100 has very yellow flames and left soot on the kettle (unfortunately I forgot to take a before photo). So I girded my loins and decided to attempt my first peening of a lipstick vapouriser. NOTE: both the Optimus 96 and the Primus 100 have the burner bells firmly jammed on their lipstick (I haven't rigged up a spreader yet).

    For the Optimus 100 I found a standard hole punch that was the correct diameter at the top for the inside of the lipstick. It had a nicely domed top, and was a snug fit with the inside dome of the vapouriser. I used a small peening hammer to tap the outside top of the lipstick.

    I visually checked the peening until I thought I had reduced it slightly. I then checked with the pricker, and kept peening until it got down to the correct size.

    Before peening the Optimus 100, a pricker with a diameter of 0.20mm was a bit loose in the jet. After peening the pricker was a snug fit.

    Flame shots for the Optimus 100 after peening:

    IMG_9931.jpg

    IMG_9934.jpg

    IMG_9936.jpg

    IMG_9937.jpg

    IMG_9938.jpg

    IMG_9941.jpg


    With the Primus No.96 I used the same technique, but with a smaller hole punch and peening hammer.
    I'm very pleased with the results:

    Before.
    IMG_9893.jpg


    After.
    IMG_9944.jpg

    IMG_9974.jpg

    IMG_9976.jpg


    Happy with the work!

    Cheers

    Tony
     
  2. JonD

    JonD United Kingdom Subscriber

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    Spot on Tony!
    The 96 is going a bomb. The 100 looks like it could do a bit more if you wanted it to...
     
  3. presscall

    presscall United Kingdom SotM Winner Subscriber

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    Result!

    John
     
  4. Tony Press

    Tony Press United Kingdom Subscriber

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    @JonD

    I'm waiting to get hold of some slightly thinner prickers before I donuts a bit more peening.

    Cheers

    Tony
     
  5. JonD

    JonD United Kingdom Subscriber

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    Another hobby of mine is guitars. I can make prickers in 1 thou steps, pretty much as required, by nipping a bit off the end of whatever string is suitable... 8 thou or 0.2mm is the smallest commonly available. 7thou (0.18mm) and 6thou (0.15mm) are made but they are quite specialist and not found in most music shops.

    On the 100 I just thought you might away with opening it up a bit more. Maybe you could have a bit stronger flame than that before it gets any yellow tips. Of course I have no idea how much tank pressure you were running when that flame shot was taken.

    It's whatever suits you!
     
  6. Tony Press

    Tony Press United Kingdom Subscriber

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    @JonD

    Well spotted... The tank pressure on the 100 was far less than the 96 - and the photo was taken in broad daylight.

    I was out in the shed this evening and cranked it up a bit... I'm happy now.

    I've got a few E-strings waiting to be measured...

    Cheers

    Tony
     
  7. JonD

    JonD United Kingdom Subscriber

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    Good news on the pressure.
    The E strings will be 8,9 or 10 thou I expect. Definitely in the range you need for the 96.
    Maybe for the bigger jets you will need to move up to the B's. :)
     
  8. presscall

    presscall United Kingdom SotM Winner Subscriber

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    The 'super light' and 'medium heavy' string sets give plenty of options, but E-strings for the 0.23mm size as you say Jon. I use a micrometer to make sure when I lose track of which is which in selecting for 0.32mm and 0.23mm pricker use.

    image.jpeg image.jpeg image.jpeg
     
  9. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi, If I am using traditional tin-plate mounted jet prickers I have got into the habit of writing, with magic marker pen, 0.23mm or 0.32mm IN BIG NUMERALS on the body.
    Can save frustrating minutes.
    Best Regards,
    Kerophile.
     
  10. JonD

    JonD United Kingdom Subscriber

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    I have only ever had one 7thou / 0.18mm.
    It was the high G on my 12string when it was fitted with a super light set.
    That set wasn't on very long. Too feeble.
    Apologies to Tony, except if someone is looking for making small dia prickers that might just come in useful.
     
  11. snwcmpr

    snwcmpr Subscriber

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    I bought a series of wires from The Instrument Workshop from .006 to .018 (Inch). They are available, in size of wire, without having to calculate from musical note.
     
  12. Funfundfunfzig

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    Another fine fettle Tony! Did you tune the burner to E sharp or F flat?

    I don't know if a stove jet is as finicky as a carburettor jet, but engine tuners use very fine jet reamers to clean and enlarge the the jet orifices as both the shape and size are critical to correct flow.

    As they say the proof of the pudding is in the eating and your handiwork suggests the technique works. Yet again educational and entertaining!
     
  13. Tony Press

    Tony Press United Kingdom Subscriber

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