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  • Users: mjh368
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  1. mjh368

    Tie Bar Strain Variation

    I am looking for a reference on allowable strain on a tie bar and allowable variation between all four bars. I would not think it could be more than a couple .001" but is there a reference. I looked in my machine manual and strain gauge sites, no help. The machine is a nissei 360.
  2. mjh368

    mold rust.

    possible sources of rust on stainless steel components? Wear. Gassing from material or poor vents. electolosis from poor gronding?? for real? Am i missing somthing. we are having a rust problem and we cant use any sprays beacuse of medical/FDA.
  3. mjh368

    SS Rust

    Hello Stainless Guru's I am an injection molder in the medical industry. We are having a rust problem on some of our 420&440 SS molds. I am trying to identify the source of the rust. the molds are cooled with 70F water and the plastic melt temps are around 400F-460F.The material is...
  4. mjh368

    Sealant replacement

    Hello all, I am looking for a replacement material to use for cavity blocking in injection molding. I currently use a metal product similar to dental amalgum. I have been looking at master bond and devcon but have not found anything. The new material would have to thick enough not to run and...
  5. mjh368

    Cavity blocking

    Hey all, Just a little survey, what do you use to block cavities??
  6. mjh368

    chemical resistance of mica

    hello all, I am interested in a table or data for the chemical resistance of mica. The mica will be used as a filler in a polypropylene part in 40% concentration. any links or tips would be greatly appreciated. thank you for you time
  7. mjh368

    PE/PP coated rod

    hello everyone, I have been searching for some time but can't seem to find what i need. basically i would like to use some type of cross-head extrusion die to caot .180-.220 steel rods to an final OD of .375. I have found some products that i believe are made with this process but they are...
  8. mjh368

    annealing alluminum

    hello everyone, First i would like to apolozize for my ignorance, i am a plastics guy. At my company we etch .062 alluminum sheet on one side. Removing material from one side causes the sheet to bow and roll. I was wondering what would happen if i clamped the sheet flat and annealed it. I...
  9. mjh368

    annealing to eliminate warpage??

    i have two parts the first is for simplicictys sake a CPVC bar and the second is a teflon 3/4 in rod. The bar has notches machines and the rod has a hole drilled through its length. The bar and the rod come out of the machine op with around a 1/32 bow. Some co-workers have suggested annealing...
  10. mjh368

    least expensive for HF

    what steel or other material (ceramic??) can be used for 10-20% HF with 5% nitric? i am currently using inconel but with recent price hikes a material change is required. For this aplication i cannot go plastic, i need strength for a 50 in 3/8 rod.
  11. mjh368

    Who has used Hotmelts

    Anyone out there had sucess with PP hotmelts? Whats the skinny? Do the have temperature and chemical resistance? Are they expensive? Do the beat hand welding? Basically i make Polypro(hand weld) and PVC(glue) boxes out of 1/4 and 1/2 sheet. What takes me a week in PVC takes 1.5-2 in PP, i...
  12. mjh368

    Aluminum Molds

    Hello i recently began working at a company that makes aluminum molds in house to make a large arrangement of parts for use in our machine. Material include PVC, 25% glass filled PE, 30% glass filled, PP, PVDF and a few others. A lot of the molds run thick parts up to 1/2 with little or no...
  13. mjh368

    LDPE low durometer

    Hello All, I am looking for injection moldable LDPE with the lowest possible durometer. So far i have located a 41D but i would like lower. Let me know what you think or even if you know some big PE suppliers to check out. Thanks MJH
  14. mjh368

    UHMW

    I am currently machining UHMW sheet into bushings at a high cost. I make the same bushings out of PVDF, PP , PE in a injection mold. I have recently heard of a injection moldable UHMW from Ticona (GUR 5113 & hostaloy). Does anyone know anything about quality/processing of these materials?

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