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Thread: Tuner construction?

  1. #16
    Join Date
    Jul 2005
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    506
    Quote Originally Posted by alinwa View Post
    LOL!

    It's like bangin' yer bean against a boulder, this one. There are a bunch of rabid believers here who feel "weight is everything" with no appreciation for nor thought of configuration. Like "how it's shaped don't matter!" it just needs to be the magic WEIGHT!

    Offsets? "nawwww"

    Diameters? "nawww"

    Weight? Caliber? Discipline? "nawwww"

    Fore? Aft? Below the bore? Above the bore? Abaft the beam?, "nawwwww. totally irrelevant!"

    It's like The Age Old Question.... is the answer to everything 21 3/4? .....Or 42?..... I've learned to just answer "YES!"
    Surrounding the bore is what you want.

    Symmetry really matters in vibration behavior.

    Since the bullet is NOT going to touch the weight most of the other
    things are not all that important.

    One thing that can be important is having the weight be able to
    extend past the muzzle slightly without touching the bullet.


    While tedious to set up, the vibration modelling is NOT all that hard.
    The first generations of SW darn near did require PhD to operate.
    The newer ones are a lot easier.
    Things like 'meshing' that establishes the small volumes for the system
    to model on is reasonable automated.

    You decide on error limits, mesh the structure, then run the simulation and look at the results.
    The next step is often to just halve the size of the cells and run again.
    See if there are major changes.
    If they line up well you probably have a good setup.
    Use the courser mash to speed things up.

    Many of the tools will produce a 'movies' of the vibration, with whatever exaggeration in movement you want to view it.
    Or even color shading on the surface of the object by displacement.

  2. #17
    Join Date
    Dec 2003
    Location
    washington.........STATE that is.
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    Quote Originally Posted by brickeyee View Post
    Surrounding the bore is what you want.

    Symmetry really matters in vibration behavior.

    Since the bullet is NOT going to touch the weight most of the other
    things are not all that important.

    One thing that can be important is having the weight be able to
    extend past the muzzle slightly without touching the bullet.


    While tedious to set up, the vibration modelling is NOT all that hard.
    The first generations of SW darn near did require PhD to operate.
    The newer ones are a lot easier.
    Things like 'meshing' that establishes the small volumes for the system
    to model on is reasonable automated.

    You decide on error limits, mesh the structure, then run the simulation and look at the results.
    The next step is often to just halve the size of the cells and run again.
    See if there are major changes.
    If they line up well you probably have a good setup.
    Use the courser mash to speed things up.

    Many of the tools will produce a 'movies' of the vibration, with whatever exaggeration in movement you want to view it.
    Or even color shading on the surface of the object by displacement.
    Here we will disagree.... keenly

    I have many offset tuners, right now all my tuners but one include offset WEIGHTING systems to not only purposely mis-align them, keep them from "surrounding the bore" because....

    bores aren't straight

  3. #18
    Join Date
    Nov 2006
    Location
    Augusta, Maine & Palm Coast, Fl
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    6,055

    The other thing is or may be

    where on the barrel to place the weight. I have a couple of upper end Air Rifles and use movable tuners that will slide up and down the barrel. Both of them tune with the weight just forward of the fore stock. 1 oz these weights weigh. One is of SS and the other of alumieum as my dear friend Lorenzo use to say. Tuners are still in their infancy I believe.

    Pete

  4. #19
    Join Date
    Jul 2005
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    506
    Quote Originally Posted by alinwa View Post
    Here we will disagree.... keenly

    I have many offset tuners, right now all my tuners but one include offset WEIGHTING systems to not only purposely mis-align them, keep them from "surrounding the bore" because....

    bores aren't straight

    All an offset will do is alter the fundamental vibration to be more elliptical and not as circular.
    Have you tried symmetrical tuners of similar wight on those barrels?
    All that matters is the actual straightness over the last bullet length of the barrel.
    The path the bullet (and barrel) take getting there makes very little difference.

  5. #20
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    washington.........STATE that is.
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    Quote Originally Posted by brickeyee View Post
    All an offset will do is alter the fundamental vibration to be more elliptical and not as circular.
    Have you tried symmetrical tuners of similar wight on those barrels?
    All that matters is the actual straightness over the last bullet length of the barrel.
    The path the bullet (and barrel) take getting there makes very little difference.
    As I said..... we disagree...... keenly

    You wrote 4 lines.

    I disagree with all of them except #2 which I'll answer simply "yes" (I'll forego the obligatory "are you freaking KIDDING me???")

  6. #21
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    Apr 2006
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    Kentucky-Home of the Kentucky Wildcats
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    In regard to all of this symmetry stuff, wouldn't the bore have to be perfectly centered to take advantage or might it's offset/curvature do the same thing?

    I've done some testing in this regard as my tuners are easy to change the cg of. In all honesty, I've not seen symmetry matter.

    I'm fairly sure that I can make the poi move but I'm not sure that it changes the end result of moving the tuner or group size.

  7. #22
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    Dec 2003
    Location
    washington.........STATE that is.
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    Mike I've got your tuner fitted to 7 barrels right now, lengths from a very straight 19 2/3" PPC to 31" and bores up to 338. Some straight, some not so straight. I promise you I WILL NOT modify your tuner in any way but am throwing it into the mix "as is"

  8. #23
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    BTW, I messaged you..... I need some greaze...... PM me and we'll talk about grease and o-rings?

  9. #24
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    Apr 2006
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    Quote Originally Posted by alinwa View Post
    BTW, I messaged you..... I need some greaze...... PM me and we'll talk about grease and o-rings?
    Happy to talk but I didn't get your message, Al.
    The lube I ship in the tuner is a white anti-seize..Love the stuff. I get it from McMaster. I've used different brands and they all seem similar, that I've seen. Good stuff and a lot less messy than the silver and copper. Those are primarily for wayyy higher temps than we'll ever see on a br rifle barrel. Maybe on a full auto torture test(glowing red), but I doubt that's what you're doing.
    Last edited by mwezell; 09-26-2019 at 05:23 PM.

  10. #25
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    washington.........STATE that is.
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    tx for the call Mike


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