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Thread: Tight / Siezed Burr screws

  1. #1
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    Tight / Siezed Burr screws

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I have a grinder (Rocky) that a customer has brought in because they cant undo the burr screws. It is 7 years old and this is the first time the burrs are being replaced, it is very clean but the screws wont budge. Does anyone have any suggestions?

  2. #2
    Senior Member Koffee_Kosmo's Avatar
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    Re: Tight / Siezed Burr screws

    I have had the need to do this in the automotive field on many occasions
    For stubborn screws we use an impact screwdriver

    Does the trick



    KK

  3. #3
    Mal Dimal's Avatar
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    Re: Tight / Siezed Burr screws

    Gday Jason,

    Do you own a Cordless Drill that has the option of a Hammer Action? If so, use this rather than an impact driver as you run the risk of damaging the bearing races through impingement of the balls or rollers against them with each impact/strike of the hammer....

    Cheers mate,
    Mal.
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    Re: Tight / Siezed Burr screws

    If you havent already done so, maybe you could drip some light penetrating oil around the edges of the screw heads, and hope that some seeps into the thread. Leave it for a few hours, re-applying if necessary, then have another go.

    There are still several other things you could try that move up the scale of brutality, but this is a benign starting point. :)

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    Re: Tight / Siezed Burr screws

    Thanks for the advice. I had already wondered about the impact of the impact screwdriver on the motor shaft. I have left the grinder overnight with a bit of penetrating oil and will reattempt today. If that fails its down to the engineers to get them drilled out. Its amazing how soft the screws are.

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    Re: Tight / Siezed Burr screws

    Having screws of a softer metal is a good thing because if things really get in a bind they will shear off instead of doing damage to other moving parts. Later!

  7. #7
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    Re: Tight / Siezed Burr screws

    most of the grinder burr screws are soft

    if i have this problem

    drill the heads of the screws, remove burrs and small vice grips to undo the screw shaft

    replace with new screws (correct ones) dont over tighten

    graham

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    Re: Tight / Siezed Burr screws

    Thanks Graham, that is the conclusion I came to.

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    Re: Tight / Siezed Burr screws

    Yeah the thought of using an impact driver, or hammer on the motor shaft, especially with the accuracy needed on the grinder sounded a bit scary.... tilting it outta alignment and what-not.

    Ive got a set of screw extractors, which is basically cuts into the head and unscrews it if the head is stripped. Theyve worked for myself in the past (not on grinders though)... but sometimes the only option is drilling out the head and doin the fix (vice-grips on the shaft etc) on it.

  10. #10
    Mal Dimal's Avatar
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    Re: Tight / Siezed Burr screws

    Youd be surprised at just how easy it is to remove super-tight screws, etc with a variable action hammer drill; some of the new cordless ones around at the moment are great for this kind of thing. They work in a similar fashion to the so-called "Rattle Guns" that loosen and tighten wheel nuts...

    Mal.
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  11. #11
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    Re: Tight / Siezed Burr screws

    I used some WD40 and dripped it into the screw - left to soften then tried again, came out fairly easily. Really want to keep away from screw extractors etc unless as a last resort

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    Re: Tight / Siezed Burr screws

    I have soaked them in WD40 overnight and used a drill with screwdriver head on low speed/max torque to try loosen. The screws are not stripped, they just wont budge. I have come across tight screws before in shower screens and grinder burrs but these are truly amazing with the amount of stuck they are.

  13. #13
    Senior Member Koffee_Kosmo's Avatar
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    Re: Tight / Siezed Burr screws

    One other non invasive option is to use a regular socket ratchet handle add a little length to it (pipe) if required (its a fulcrum thing)

    Use a small socket that will fit the hex size of a drill style screwdriver bit. Fit it in the screw head and turn
    Rarely fails for me as long as you have enough downward pressure you cant go wrong

    However if the screw snaps or still doesent budge ! then it really was in too tight drilling out will be nessesary

    KK


  14. #14
    Senior Member GregWormald's Avatar
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    Re: Tight / Siezed Burr screws

    If the screws are Philips head, then a technique I have used on motorcycles is to cut a slot in the head with a Dremel and then use a great big slot driver.

    This also lessens the amount of down-force necessary to keep the driver from popping out of the screw head.

    Greg

  15. #15
    ev
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    Re: Tight / Siezed Burr screws

    If the WD40 doesnt work after 24hrs, spray again & wait another day. I had a stubborn ball joint I just couldnt drop on my car. I tried this trick & it almost fell out on its own!

    Evan.



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