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  1. #21
    I'm still not understanding what I am looking at.

    The plasticiser is the bit that converts granular plastic to melt. This has to connect to the mould, inject the melt, hold the pressure until something freezes, gates, sprue, whatever, disconnect from the mould and melt more granules.

    Generally there are 3 ways in to a mould. On the mould parting line, through a sprue bushing, through heated runners where the melt never sets.

    I thought that sprue bushing was usually a flat on flat seal with maybe a puff of cold air if stringing got too bad.

    I thought I saw something like a countersunk screw head shaped cavity in your picture which would be fine and dandy if it was on the mould parting line because you wouldn't have to worry about getting it all out before the next shot.

  2. #22
    Original scan is a detail view from this sheet
    Last edited by gavztheouch; 09-10-2014 at 09:02 PM.
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  3. #23
    So you have two tie bars 4" apart. The platens have 3" indents presumably to locate the mould halves. The moving platen (top) has a 2" hole through which the ejector pins pass.

    Can we assume the fixed platen (bottom) has a similar hole, which isn't shown, and the nozzle comes up from below, the drawing Y axis, through that hole. It does not come in from above, the drawing Z axis, to hit the parting line.

  4. #24
    Yes the nozzle does come up from below in the diagram, but I have it round the wrong way, it needs to be rotated 90 degrees. This is a horizontal machine.
    Last edited by gavztheouch; 10-10-2014 at 09:20 AM.
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  5. #25

    Bought this 40mm long bar from ebay, hopefully I will be able to chuck it up in the lathe and still get enough material sticking out to make a blank for the injection molder.
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  6. #26
    IIRC I have about 4 or 5 feet of 4 1/4" 7075 T6 somewhere in my workshop.

  7. #27
    Sounds tempting Robin but I don't think my myford will be able to work something that big.
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  8. #28
    Anyone got any ideas as to what a custom made carbide or hss tool would cost to cut the profile for my injection mold "nozzle gate" as per drawing?
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  9. #29
    mekanik's Avatar
    Lives in Barrow in Furness, United Kingdom. Last Activity: 12 Hours Ago Has been a member for 7-8 years. Has a total post count of 560. Received thanks 64 times, giving thanks to others 73 times.
    Can you make one of these

    D bit.doc

  10. #30
    I am still not understanding, isn't this shape ground into steel perfection for you as part of the sprue bushing?

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