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Thread: sprue puller

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  1. #1
    Registered
    Join Date
    Mar 2012
    Posts
    373

    sprue puller

    I finally have my Boy 15S injection molding machine up and running and I found a MUD frame on Ebay and ordered a set of aluminum mold plates. I was about to order some injection pins to make my first mold and realized that I will need to have a sprue puller in the mold and a sprue ejection pin.

    Looking online I found these sprue lock bushings, but it seems that there are not many different types of premade bushings available.https://us.misumi-ec.com/vona2/detai...079910/?Inch=0

    My question is do most people buy the sprue puller bushings like this already made or do they just machine a sprue puller into their mold cavities?

    If people are machining them into the cavity can someone share with me a design for one with a cold slug well that is good for both ABS and polycarbonate? Also, is there a recommended reverse taper cutter that can be recommended for machining the sprue puller cavity. Obviously, this needs to be done at the correct depth and angle to work well. I am not sure where to buy this odd cutter.

    Also, what diameter sprue ejection pin would you normally use on small molds and how much larger should I ream the hole for it? It would be great if someone could recommend a specific part number of pin to use.

    Thanks in advance for any advice you can give me on this.

  2. #2
    Junior Member
    Join Date
    Dec 2018
    Posts
    1
    In the cold slug area of the spruce puller pin, just use a ball shape burr bit to create an under cut.

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