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  • Tapping MDF

    I have an application where a device will be mounted on a plate, the plate will then be installed over MDF as a substrate. I would like to use a machine thread (1/4-20) in the MDF if it can be done sucessfully. Has anyone tried tapping MDF, and if so, how were your results? Will a machine thread hold, or should I ditch the idea and use a sheetmetal or wood screw?

    I have seen here that some have used MDF for fixturing purposes, though not sure what types of screws were used, so.....

    I'm thinking tapping sucesfully is possible as MDF composite appears to be a solid, more or less.
    Paying Attention Is Not That Expensive.

  • #2
    MDF will crumble if you try to tap it.
    Not a good idea.
    However, there are inserts you can buy that are machine threads inside, and a coarse, wood thread outside, that will do what you want.
    They use them for knockdown MDF furniture.

    http://www.woodcraft.com/family.aspx?familyid=1048

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    • #3
      ERBenoit, Ries,
      There is a way to tap MDF and it works very well. First drill and tap the hole, then pour a cyanoacrylate (Krazy glue) glue in the hole, and then re-tap the hole. This make a very strong thread. This is how the MDF pulley is made on the Rose Engine lathe that I posted about here a while back, http://bbs.homeshopmachinist.net/sho...e+engine+lathe

      http://www.ornamentalturners.org/ass...RoseEngine.pdf

      We have sold over 100 of the kits and have not had one complaint about the strength of the threads. The thread holds the rosettes (cams) which are changed frequently so it sees many cycles.
      Mark Hockett

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      • #4
        Originally posted by Ries
        However, there are inserts you can buy that are machine threads inside, and a coarse, wood thread outside, that will do what you want.

        http://www.woodcraft.com/family.aspx?familyid=1048
        I had thought of, and forgot about those. I will be working cramped inside of a cast acrylic box, so the inserts seem to be my best option, as I only want to visit this once.

        I'll file Mark's method for when circumstances will be easier to give that method a try.

        Thanks
        Paying Attention Is Not That Expensive.

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        • #5
          I've tapped MDF with pretty good results.... Nothing as small as 1/4", did a good many in 3/8" for application in woodworking, like for positioning/hanging, never anything with any stress to speak of. It makes a pretty thread, ---never tried the super glue trick but I bet that would make for a pretty decent thread.

          I'm presently pondering a situation to use a piece of 3/4" MDF as back up on a complicated milling procedure in some thin sheet, maybe 3/32 aluminum or steel... will probably give it a try
          If everything seems to be going well, you have obviously overlooked something........

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          • #6
            Can you drill through and insert a T-nut from the back?

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            • #7
              Use what are called here "euroscrews". These are specifically designed for secure holding in MDF.

              http://www.ovisonline.com/store/deta...d=MFPE05300R2N
              Free software for calculating bolt circles and similar: Click Here

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              • #8
                Euroscrews are also sold by Lee Valley Tools in smaller packs, (100s.) They also produced a technical report on using bolts instead of wood screws for wood assemblies. In essence it proved that tapped holes and bolts beat wood screws hands down for holding power in hardwoods. They made no mention of hardening the threads with cyanoacrylate, but with it, the logic would extend to soft woods like pine, spruce, and plywoods.
                Duffy, Gatineau, Quebec

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                • #9
                  We can buy euroscrews in blister packs at Canadian Tire and other hardware stores. I don't know how available they are in the US.
                  Free software for calculating bolt circles and similar: Click Here

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