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Question about my old Iwata HP-C (danger, crap photos inside!)

Discussion in 'Airbrushes' started by [amw], Aug 11, 2018.


  1. [amw]

    [amw] Double Actioner

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    Hello!

    As I mentioned in my intro thread I managed to obtain a (I think) not so new HP-C from ebay. There isn't much info on them as they seemed to exist in that scary time before the mass use of the internet (sadly I'm old enough to remember that!). So if there's any fellow err, less young people on here who remember how these work that would be great!

    To give you an idea, look at the box:

    1.jpg

    It has a nice velvety inside :) :

    2.jpg


    My question was regarding taking the back end apart. Have a look at this photo:
    3.jpg

    Now, part 2 is the bit you screw in and out to adjust the needle-spring tension. It does not screw 'all the way' out - you can't remove it from the brush.

    So my question was, does part 1 (from the photo) - the bit the handle screws onto, unscrew from the body of the brush?

    I've found this screw on the bottom:

    4.jpg

    Loosening that doesn't seem to make anything happen...

    I don't really want to grip that brass thread and try and remove it forcefully as I'll end up never being able to put the handle back on, which would be a shame.
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  2. Malky

    Malky Pencil Pushing Protagonist Very Likeable!

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    I have an old HP-B which I've worked out is from around 1983, mine in came a box almost identical to your box but mine has the name iwata on it, since yours doesn't I'm assuming your brush is from the late 70's

    Anyway, mine has exactly the same setup as yours does including the screw underneath, on mine that won't budge without force so I havent bothered to attempt to move mine any further, however, I do know that the screw goes into a groove on the underside of the piece you want to remove to stop it turning, I would suggest that you will have to take that little screw all the way out before the other piece will turn, if you still can't get it to turn, all you can do is wrap some thick card around the threads so can grip it with your pliers without damaging the threads, that piece probably hasn't been removed in years so it will be stiff, I reckon a couple of taps on the pliers with another metal instrument might enough to shock it free.

    Hope this helps.

    And your pics are fine:)

    EDIT: The short answer is yes, that part will unscrew from the body as long as you remove that tiny screw:)
    Last edited: Aug 11, 2018
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  3. Vladimir

    Vladimir Detail Decepticon!

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    That #1 part is where normally back handle is screwed in. I have HP-C like yours and have seen many others, but haven't seen such strange thing anytime before as in your brush.
    Small screw at the bottom holds in certain position round part in which part holding the needle moves inside. As I can judge on my HP-C (and other old japanese ABs) that bare brass part #1 should be screwed out without unscrewing small bottom screw.
    To remove the internals you must first unscrew that brass part.

    BTW to have it working you also need to install an air valve:)
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  4. Malky

    Malky Pencil Pushing Protagonist Very Likeable!

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    I can assure you that little screw stops the brass from turning I have exactly the same setup, the reason is so that the whole mechanism won't accidentally turn when the trigger tension is adjusted, newer models dont have this feature, but his does and so does mine, trying to get the mechanism out without removing that screw will result in permnent damage the mechanism and the body requiring a replacement brush.

    And the air valve was discussed in another thread.
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  5. Leakyvalve

    Leakyvalve Needle-chuck Ninja

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    The part where ..part 2 will not screw out makes no sense what so ever. I don't see how they would expect someone to take it apart for maintenance as well as deal with that threaded portion that is only partially threaded on the inside? (assuming you had to remove that sleeve?) as well as the fact those bottom screws are almost impossible to remove without damage. It just don't add up.
    Also that is the very first one of those hp-c's with rear threads I've ever seen.
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  6. Malky

    Malky Pencil Pushing Protagonist Very Likeable!

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    @Vladimir and AMC, my apologies, I just checked my brush and there is no need whatsoever to remove the small screw, all it does is stop the needle chuck mechanism from turning.

    The brass part is part of the body and can't be removed.

    To remove the trigger tension mechanism simply keep turning part two anti-clockwise and it will come away on its own, so no tools needed:)

    You are difficult to tag AMC due to the strange brackets either side if your user name, I can't find these on my keyboardo_O
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  7. Vladimir

    Vladimir Detail Decepticon!

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  8. DaveG

    DaveG Detail Decepticon! Very Likeable!

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    I believe the part you have labeled as 1, actually belongs in the rear handle and has become detached from where it belongs. It will need to be removed from the body to go further - good thing is you can purchase another handle when that part gets buggered up removing it.The screw underneath keeps the chucking guide from turning while in the brush, and has nothing to do with removing the guts of the brush - no need to ever remove it.
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  9. [amw]

    [amw] Double Actioner

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    It does work better with one of them ;) Once I had cleaned a lifetimes-worth of gunk out of the brush I was/am pleasantly surprised with how well it works.

    I'll have to gingerly attempt to remove the threaded bit at some point when I'm feeling brave. I can see why they have improved the design since then...
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  10. DaveG

    DaveG Detail Decepticon! Very Likeable!

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    they still make this brush the exact same way - been a work horse for more than 50 years now with no changes. I just picked one up last week, as well.
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