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  1. Replies
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    390

    Hot Runner/Tolerance Issues

    Hi all,

    Iím currently running a 16 cavity hot runner mold with acetal. We ran the first lot of material and all the QC came back good. We swapped to another lot and now weíre having parts coming...
  2. Thread: Clamp Force

    by moldingppm
    Replies
    1
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    1,644

    Re: Clamp Force

    projected area x (times) tons required per SQFT/MM
  3. Replies
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    907

    Re: Sanity Check

    Following up to this;

    I got a last-shot sample from my customer. Their sample measures to the same as what we're getting, so I know it's not an actual process issue.

    They ended up OK'ing our...
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    5
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    907

    Sanity Check

    Hi all,

    Over the last few days we got in a PBT job that weíre having issues with (first time running this material). To bring the parts close to tolerance (one dimension is in, the rest are under...
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    4
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    1,822

    Re: Too much shrinkage

    So I put it in another machine to narrow down if it's a machine issue, seems to still be the same. I think we're just not packing out the parts enough. Cushion is around .15 mm variance (according to...
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    4
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    1,822

    Too much shrinkage

    Hi all,

    I'm running some parts that we are having tolerance issues with. Comparing to the last time we ran these (last run was in 2015), the parts are running .01" shorter than previous, which is...
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    1,750

    Re: What is this defect?

    I narrowed it down to contamination or something, swapped into another machine and it ran perfect.
  8. Replies
    12
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    1,750

    Re: What is this defect?

    Cold runner, cashew gate



    Slower injection rate still has this defect, even in the exact same spot every time.



    I've lowered my temps, as well as lowered my residence time as well and...
  9. Replies
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    1,750

    Re: What is this defect?

    I've just checked again with other ABS and the issue is actually still there. I'm wondering if maybe the mold is in need of a good cleaning? We just got it back from being polished, I'm wondering if...
  10. Replies
    12
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    1,750

    What is this defect?

    Hi all,

    I'm having a new defect in a part that I'm trying to troubleshoot. I've attached a picture of the defect. I've only had this with the new color that we are running, this is a precolored...
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    1,019

    Re: Two-shot molding opportunity

    PM has been sent
  12. Replies
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    9,244

    Drying Desiccant

    Anyone here dry out their dryer desiccant to recharge it? We have a dryer that is not drying well that the desiccant hasn't been touched since it was put in 10+ years ago. I was wondering if I should...
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    1,753

    Re: Need Help Troubleshooting Defects...

    I've reattached pictures, the original ones don't seem to open big enough. 456457
  14. Replies
    2
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    1,753

    Need Help Troubleshooting Defects...

    Hi All.

    I'm having an issue with some ABS parts. It looks like I'm getting some gate blush and possible stress marks on these parts. Can anyone help me troubleshoot this? I've played with...
  15. Replies
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    3,874

    Re: Processing Troubleshooting

    I lowered the tonnage and it seemed to go away. Thanks!
  16. Re: which machine to buy for production of precise parts

    To be honest, I would source your parts from a molder. Buying a machine used (blindly) and not knowing the technicals of molding will cost well more than just the machine cost.
    If you're dead-set...
  17. Replies
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    3,874

    Re: Processing Troubleshooting

    I can't post anything more than I already have, sorry.


    That's what I was thinking too, but we have run this tool over the last year and this has been the first time we've had this issue. This...
  18. Replies
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    3,874

    Processing Troubleshooting

    Good Evening,

    I'm injection molding some parts from homopolymer Polypro. We're getting these white marks on the same spot on every part. I'm trying to troubleshoot what it is and how to fix it....
  19. Replies
    3
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    1,886

    Over-molding Aluminium with PEEK

    Hi everyone,

    I have a customer that is requiring us to over-mold aluminium with PEEK. Are there any suggestions for processing that anyone has? We've never molded anything this exotic, so any...
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    2,397

    Heated molds and temps

    Whatís the reasoning for running tools at a higher temperature than just say tower temp? Iíve always believed that you run higher temperatures for high gloss finishes, and when you have surface...
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    1,482

    Re: FR ABS Mold Steel

    Thatís what I was thinking. Sounds to me like my tool shop either didnít know or is taking advantage of me/my customer. Iíll quote it in H13 as I suspected. Thanks for the input.
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    1,482

    FR ABS Mold Steel

    Good Afternoon,

    We're working on a project that will require the use of FR ABS. Our customer is trying to keep the mold cost low (as if that's something we all haven't heard before). My tool shop...
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    1,658

    Re: mold condition grading system

    We usually start by keeping track of the number of shots the mold has run, as well as the dimensions of the parts over time. If your dimensions change over (let's say) 500k pieces, then you know the...
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    Re: core deflection

    Definitely check wall thickness first. Also, as Husky said, same cavity or various? I'm assuming that this part is cored all the way though (as in, both ends of the part have an opening)? If so, how...
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    2,074

    Re: Finding Equipment Buyer

    The real question is, what do you have to sell?
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