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  1. TJK1

    Removing Epoxy

    What are the best ways to remove hardened epoxy from metal parts? We have hundreds of small metal parts that have two halves epoxied together. We need to take them apart. We do not want to destroy them because we eventually will have to epoxy them back together again. I do not know what the...
  2. TJK1

    Bonding alum to a painted surface

    I need to bond a small .030 thick x .60"tall x 4"wide aluminum nameplate on a baked enamel painted chassis. It will be mounted on a vertical side of the chassis. It needs to mounted securely but still be able to be removed in a year or two. Also, when it is removed, the painted surface it was...
  3. TJK1

    Datum dimensioning

    I am dimensioning a sheet metal part. There are many holes and I am using two edges of the part to locate the first hole, which will be my (0,0) datum. All of the other holes will be dimensioned from this datum using ordinate dimensioning. I am doing this because our sheet metal fabricator...
  4. TJK1

    Liquid paint vs. powdercoat

    What can provide a better, more scratch resistant and chip resistant painted surface on an chassis that will be handled and moved from bench to bench many times a day, in doors? Would a MIL-Spec liquid paint or a powder coating be better? If a Mil-Spec liquid paint would be better, which...
  5. TJK1

    Painting and polishing question

    I have several questions. Is polyurethane per MIL-C-85285 a good choice of paint for a chassis which is staying indoors? Is Epoxy primer per MIL-P-23377 the correct primer? What would be the correct chem film callout, Mil-C-5541 Class__? and Type__?. What is the finest grit belt you can...
  6. TJK1

    Chrome versus Nickel coating

    I need to design a shiney looking wear surface. A 6" square, 3 pound aluminum chassis will slide over it about 10 times per day. If the wear surface was steel, would chrome or nickel be a better durable coating to put over it? If the wear surface was stainless steel, would chrome or nickel be...
  7. TJK1

    Chrome versus Nickel coating

    I need to design a shiney looking wear surface. A 6" square, 3 pound chassis will slide over it about 10 times per day. If the wear surface was steel, would chrome or nickel be a better coating to put over it? If the wear surface was stainless steel, would chrome or nickel be a better coating...
  8. TJK1

    Minimum Bend Radius

    If I have some bends with the grain and some against the grain what is the minimum bend radius for 5052-H32 aluminum sheet that has a thickness of .125 inches? I want to make sure that we have no cracks at all. Thanks for your help.
  9. TJK1

    Installation or Assembly drawing??

    I appreciate everyone's help. I have ASME Y14.24-1999, not the 2004 version and did not see "Combination of adopted items drawing", "Package content drawing", or "Transportability drawing". Were these drawing types added as part of the 2004 revision to the Y14.24 spec.?
  10. TJK1

    Installation or Assembly drawing??

    I have several assemblies that never get mechanically attached to each other, but which comprise a system. Some of the assemblies are connected with data cables, but some are wireless. All together they make up a system. I need to create a drawing which calls out all of these assemblies, in...
  11. TJK1

    Powdercoating pretreatment for alum and steel

    kenvlach, thanks for the info.
  12. TJK1

    Powdercoating pretreatment for alum and steel

    There are no platers in town that do phosphating, but I found out that some of the powder coaters claim to use a product called Fremont 72 and Fremont 490. Although they don't know anything about it, they use it as some sort of a pretreatment wash for parts before they are powdercoated. I...
  13. TJK1

    Powdercoating pretreatment for alum and steel

    For the 6061-T6 aluminum panel, I think we will just use Chemical Film Treatment per MIL-C-5541, class 1A, clear. For the steel bracket, we do not have anyone near by that can do the phosphate coating, so the powder coater we plan to use said that he could just sand blast the steel part and...
  14. TJK1

    Powdercoating pretreatment for alum and steel

    Would chromate conversion coating per Mil-C-5541 work ok as a pretreatment for powdercoating on alum? Would Phosphate coating per TT-C-490 work ok as a pretreatment on Cold rolled steel? What about Zinc per ASTM-B633, would it work ok as a pretreatment for powdercoating on Cold rolled steel...
  15. TJK1

    Stainless Steel Fasteners

    Thanks Unclesyd. I suppose I could use a zinc plated steel nut with a stn stl screw. What do you think? What about the question about mating fasteners of different thread class. Any thoughts regarding that?
  16. TJK1

    Stainless Steel Fasteners

    Is it O.K. to use #10 stn stl screws with stn stl nuts(not locknuts)? Would there be a problem with galling? Or would that just occur if the nut was a locknut? Also, what is the rule regarding the mating of screws and nuts with different thread classes (class 2 vs. class 3)? I seem to...
  17. TJK1

    Drafting Text Height

    Thanks Finethread. I do not have Y14.2 and so I was wondering, if we draw on an electronic AutoCAD format of a D-size sheet of paper, but then plot the image on a B-size (11x17)piece of paper would we need to follow the guidelines for D-size or B-size text size requirements, as specified in Y14.2?
  18. TJK1

    Drafting Text Height

    I was not able to find the 3mm minimum text height referenced anywhere. Does it apply to hard copy prints (any size A through E)?
  19. TJK1

    Drafting Text Height

    I have been asked to review our companies new drafting standards manual. We use AutoCAD and generally use either B-size or D-size templates in AutoCAD to create the drawings. We always print out our hard copies as B-size prints. The guy writing the manual specified that text should be created at...
  20. TJK1

    Will a Setscrew work??

    Thanks MintJulep. The 1/4" thick bracket is only .300 inches tall and since I need to use at least a #10 screw, even the head of a countersunk screw is too big, since it measures about .380 dia. A PEM stud sounds good but we don't have time to get them. Your idea of just putting a screw in...

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