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OT: (*ON*) Topic: HF Emergency Tap Grinder

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  • OT: (*ON*) Topic: HF Emergency Tap Grinder

    I bought this little diamond grinding wheel set a while back. It was on sale then & cost me $3.99 though. http://www.harborfreight.com/cpi/cta...emnumber=32397

    The flat one had about .010" runout so I chucked it up with a ring of brass shim stock around it to protect the jaws and bored out the hole true. Made a nice arbor for it and used it once in the mill to grind down some hardened T-nuts. I chucked it in a drawer and forgot about it 'til today when I needed to grind down the shank of an 8-32 tap to finish tapping a deep hole.

    I chucked it in the lathe, cranked up the speed, chucked the tap in a cordless drill and bammo, ground down the shank in no time. Oh yeah, check out the custom chuck grit shield. Another use for a 2 liter soda bottle.;D

    Milton

    "Accuracy is the sum total of your compensating mistakes."

    "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

  • #2
    Your diamond tools will last much, much longer on steel if you put a little lubrification on them. Just water will do.
    VitŮŽria, Brazil

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    • #3
      You're right David. I dipped the tap in a cup of water often while grinding which seemed to work OK. The relative speed was slow enough that weren't any sparks at all.

      I dont have any type of coolant system on the lathe yet anyhoo...
      Milton

      "Accuracy is the sum total of your compensating mistakes."

      "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

      Comment


      • #4
        Just for reference, I did the same thing to a 1/4-20 tap that I needed to use to tap a very long deep hole (no clearance hole allowed). Only diff is that I used a dremel AO wheel of about the same aspect with the dremel in rubber jaws on a vise...
        Russ
        Master Floor Sweeper

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        • #5
          Unless it's a carbide tap, why not just use a regular grinding wheel?

          I've done that to "make" bottoming taps.

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          • #6
            An A/O wheel would do fine; I just didn't have one small enough in the shop to cut the small area needed on the shank of an 8-32 tap. 1" wide, 8" wheel was the next step up and way too big.

            I looked at my Dremel but didn't have a decent wheel or a way to hold it.
            Milton

            "Accuracy is the sum total of your compensating mistakes."

            "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

            Comment

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