$30, 1 hour Tool post grinder


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Thread: $30, 1 hour Tool post grinder

  1. #1
    Registered DennisCNC's Avatar
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    Thumbs up $30, 1 hour Tool post grinder

    Here is a quick tool post grinder I whiped up to get a good bearing fit on the ballscrews. It's a $28 Harbor Freight 1/2 hp (what it says on the lable, but more like 1/15) and a angle to hold it to the tool post. The thing works well.

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    Attached Thumbnails Attached Thumbnails , 1 hour Tool post grinder-toolpostgrinder-jpg   , 1 hour Tool post grinder-toolpostgrinder2-jpg  
    Dennis


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    Registered mxtras's Avatar
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    Horrible Freight is one awesome place for picking up donor parts - it's a big bonus when it ends up working as planned!

    Nice ingenuity, Dennis!

    I have a similar Franken-post grinder made from a $9 HF die grinder - it took two of them to get the job done as the first one lasted about 3 seconds and then siezed! I wouldn't dare chuck up an Ingersol Rand die grinder to turn the OD true to the shaft so that it will mount into a fixture, but a $9 one (or two or three) just begs to be modified!

    How did you dress the wheel or did you just wing it?

    Scott

    Consistency is a good thing....unless you're consistently an idiot.


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    Hey, pretty impressive! I love this kind of DIY!

    That's just what I have been needing to turn down the flange on my NMTB-30 toolholders to fit a QC30 spindle. The two grooves for the drive dogs makes for a pretty large interrupted cut and it just tears up my regular tooling.

    Hmm.. now where did I put that 15% off HF coupon?



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    Registered DennisCNC's Avatar
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    If you really want a nice finish then you need to make new washers that hold the grinding wheels as the ones on it are stamped so they wable. So I stacked two on one side and it's working for now.
    I just used a regular hand grinder to dress the wheel as it was off center by ~1/8 or so, you have to chase the darn thing around the shop if you don't true it some what.
    I was grinding with it for about ~40 min and it got warm so at this duty cycle it will last a while (i think).

    It also kept a even diameter over the lenght of the 3/8 machined area.

    Dennis


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    Registered mxtras's Avatar
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    If you fashion a way to mount a single point, diamond dresser (~$6) to the chuck or the bed, you could traverse the wheel across it and make the face of the wheel run perfectly true....just a thought. I don't even know if it is creating a problem for you. I know dressing a wheel by hand can be a challenge - especially if it has a bad hop, not that your HF bench grinder wheel had a hop or anything.....

    Scott

    Consistency is a good thing....unless you're consistently an idiot.


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    As a side note, I have always been told to cover the ways to protect them while grinding. The dust will chew them up in a heartbeat. Be sure to clean and oil throughly when done.

    Bubba

    Art
    AKA Country Bubba (Older Than Dirt)


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    Default thanks for the pics

    that's an awesome idea! i have an old belt lathe i am
    thinking on trying this on



  8. #8
    Registered DennisCNC's Avatar
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    I thought it would not be possible to get a near perfect bearing fit with my machines. It's a nice tight+ slip fit all the way along the shaft I ran a little 600 sand paper by hand to finish it off.

    Attached Thumbnails Attached Thumbnails , 1 hour Tool post grinder-ballscrewbearing-jpg  
    Dennis


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    yeah, thats nice.
    what size screw is that dennis and can you tell us what
    bearing/s you might be using also.
    nice job
    thanx



  10. #10
    Registered DennisCNC's Avatar
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    The screw is McMaster-Carr 5/8x5tpi 72 inch long. The bearings are 3/8 ID 7/8 OD china stuff.

    Dennis


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