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  1. #31
    Elite Member sandman2234's Avatar
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    Dec 2005
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    4,097
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    Jacksonville, Florida
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    JD2555

    Default Re: How do I ream out hardened steel?

    The O/P doesn't have his location listed, but if he is anywhere near Jacksonville, Florida, I would be happy to set the gearbox up in the mill and do it the right way (or should I say the way he seems to be leaning).
    I am with Soundguy, as his is a much better way of fixing the problem in a much easier way.
    Several people mentioned bushings, but what about a shoulder bolt so that eliminates one of the bushings, and some of the slack.
    For those with the idea that adjusting the slip clutch is the right way to fix this problem, it isn't. Yes the slip clutch needs to be properly adjusted, no doubt, but the slack in the yoke is allowing a headstart towards slamming into the bolt, which only removing the slack is going to fix.
    Again, I would drill out the yoke. If you make a mistake drilling it, then the next thing to do would be to replace the yoke with the correct one this time, something the O/P is apparently trying to keep from doing by simply drilling it to fix it. If you attempt to drill out the shaft and you make a mistake, an imput shaft or a replacement gearbox is not going to be a $20 item...like the yoke. (guessed at the price)
    David from jax
    A serious accident is one that money won't fix.

  2. #32
    Super Member
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    Feb 2006
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    8,499
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    VA
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    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: How do I ream out hardened steel?

    Quote Originally Posted by orezok View Post
    I would drill a hole through one side then slip it on the shaft using the shaft to center the second side by drilling through both. If you sincerely want to drill the hole in the shaft larger, I would use a bridge reamer. The long taper prevents binding and they will cut hard steel easily.
    Attachment 302775
    Good idea. The alignment issue is quite critical to assure both bolt crossings share load. Youre still left with 3/8 shear tho and OP thinks this is not enuf. Also, any shaft/collar play from wear will still be there. The overhang of the slip clutch serves to aggravate this.
    That strikes me as applicable for short holes. A tapered continuous cut an inch and a half long in hard stuff would tend to twist it off.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  3. #33
    Silver Member
    Join Date
    Jan 2013
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    222
    Location
    Chesterfield, Mi
    Tractor
    Ford 3000 & 4400 Case 830 Case 350 dozer

    Default Re: How do I ream out hardened steel?

    It might only be case hardened. I'd try taking a grinder to it and see if you can get to anything soft about .060" depth then drill. Option 1) Grab a 1/2 carbide end mill (ball nose might work better) and put it in your drill and go for it, after you open the hole a little bit with a grinder. 2) Put a taper on a pin with some layout ink and grind it in, it will go a lot faster than you think. Save your money don't mess with cobalt or hss drill bits, there not gonna do it if its hard all the way through.

  4. #34
    Super Member
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    Feb 2006
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    VA
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    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: How do I ream out hardened steel?

    End mills are more fragile than drills owing to their side cutting purpose. The angle of the cutting edges is more acute. That means less support of the edge and easier cracking.
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  5. #35
    Veteran Member orezok's Avatar
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    Jan 2004
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    1,120
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    Mojave Desert, CA
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    Kubota B7800

    Default Re: How do I ream out hardened steel?

    Quote Originally Posted by SPYDERLK View Post
    That strikes me as applicable for short holes. A tapered continuous cut an inch and a half long in hard stuff would tend to twist it off.
    larry
    In heavy construction we use them for high tensile beams with flanges of over 1-1/2". To be on the safe side, you could approach from both sides.

  6. #36
    Epic Contributor Soundguy's Avatar
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: How do I ream out hardened steel?

    wow...

  7. #37
    Elite Member sandman2234's Avatar
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    Jacksonville, Florida
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    Default Re: How do I ream out hardened steel?

    Quote Originally Posted by Soundguy View Post
    wow...
    Yeah, the answer seems so easy, and yet...
    David from jax
    A serious accident is one that money won't fix.

  8. #38
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: How do I ream out hardened steel?

    Quote Originally Posted by sandman2234 View Post
    Yeah, the answer seems so easy, and yet...
    David from jax
    yeah.. 4 pages now..

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