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IndustryArena Forum > MetalWorking > MetalWork Discussion > please, i need a " trick " : how to align a long drill on a misaligned turret ?
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  1. #1
    Join Date
    Jun 2015
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    4131

    please, i need a " trick " : how to align a long drill on a misaligned turret ?

    hello all the radial turret, is a bit misalinged, only on z : 0.12mm over 100mm

    please, how to align a loooong drill, without aligning the turret ? kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  2. #2
    Join Date
    Apr 2004
    Posts
    5728

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    You just need a flexible drill bit...

    Just kidding - no, you can't expect to drill a straight hole if the part isn't lined up straight with the drill. The longer the drill bit, is, the more evident the inaccuracy will be.
    Andrew Werby
    Website

  3. #3
    Join Date
    May 2003
    Posts
    323

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    Option 1

    Spot drill
    Stub drill
    Long drill

    Option 2
    Spot drill
    Stub drill
    Bore hole
    Long drill.

    .12 is not a lot out of center

    Generally you can tap it in if you are using er collet.



    Sent from my MHA-L29 using Tapatalk

  4. #4
    Join Date
    Dec 2013
    Posts
    5717

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    Hammer. It will straighten out.
    Jim Dawson
    Sandy, Oregon, USA

  5. #5
    Join Date
    Aug 2009
    Posts
    1567

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    Drill from both ends half way thru Part (s)

  6. #6
    Join Date
    Sep 2006
    Posts
    6463

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    Fix that turret....it will always be off centre if it ain't fixed good...….the longer the drill the further off centre the point will be, but a long drill will be flexible enough to pull itself into centrality once the drill starts to bite provided the part was centre drilled first.
    Ian.

  7. #7
    Join Date
    Jun 2015
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    4131

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    radial turret, is a bit misalinged, only on z : 0.12mm over 100mm
    please, what should i put between the turret and the toolholder, in order to reduce/adjust the missalignment ?

    whatever it is, maybe it should :
    ... not damage the surface of the turret or of the toolholder; even micro-surface scratches should not occur
    ... be coolant resistant

    kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  8. #8
    Join Date
    May 2003
    Posts
    323

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    Google turret alignment

    Sent from my MHA-L29 using Tapatalk

  9. #9
    Join Date
    Mar 2015
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    409

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    If it has to be accurate, place some mild steel in the turret and a drill or toolbit in the chuck. Than drill or turn the mild steel to hold the requested tool. In just a few minutes, you have a perfectly aligned tool.

  10. #10
    Join Date
    Jun 2015
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    4131

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    In just a few minutes, you have a perfectly aligned tool.
    hi hfjbuis, it works, but is not repetable ... also, i am afraid that i will have to align the drill inside the chuck / kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  11. #11
    Join Date
    Mar 2015
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    409

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    it works, but is not repetable
    If you don't (re)move the "drilled" holder, the long drill should be repeatably (re)placed exactly the same!

    Check the shaft, it may be crooked damaged or the size is stamped (should be lasered)!
    If you can, use a tapered shaft.
    To much pressure during drilling will bend any shaft, especially long ones.
    Maybe the misalignment of the turret is not repeatably!

    i am afraid that i will have to align the drill inside the chuck
    If the placement of a drill in the chuck isn't accurate enough, use a turning tool or single tooth endmill to "drill" the hole at the final diameter!

  12. #12
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    Jun 2015
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    4131

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    thanks guys thank you hfjbuis / kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  13. #13
    Join Date
    Apr 2016
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    74

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    do you have enough space between the holder and the pocket to shim it?

  14. #14
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    Jun 2015
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    4131

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    hi skywalker, i could shim between toolholder & turret; but what should i put in there ? surfaces are very smooth, and if i use metalic shim, then i will damage those surfaces; even a micro-scratch is a 'damage' that i wish to avoid / kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  15. #15
    Join Date
    Jan 2007
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    36

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    Look up gun drills

  16. #16
    Join Date
    Jun 2015
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    4131

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    Look up gun drills
    please machinejack, do you have a specific link ? kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  17. #17
    Join Date
    Jan 2007
    Posts
    36

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    Hey kitten just google deep hole gun drill this is how they made gun barrels. I once drilled two 5/8" parallel holes thru 36" 4140 and only had .010 run out.

  18. #18
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    Jun 2015
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    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    hello machinejack, far as i know, gun holes are machined using at least one guide bush ( pilot sleeve, etc ) in front of the part

    in other applications, deep holes are machined without them

    so far, whatever infos i have searched on the www about these techniques, i only found general infos, but no ideas about how to align on a missaligned turret; should i keep searching ? kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  19. #19
    Join Date
    Apr 2016
    Posts
    74

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    deadly, i have used plastic shims, no damage to pocket.
    as far as gundrilling, that is what we do here, you are correct, we use whip guides, that follow the drill.
    we have used gundrills on one horizontal machine, ok results.i think you need to align it, do you have holder you could modify to let you adjust it?

  20. #20
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    Jun 2015
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    4131

    Re: please, i need a " trick " : how to align a long drill on a misaligned turret ?

    hello skywalker i also used plastic shims, making adjsutments up to <0.025/150 mm ( turret is still at 0.12/100 ), and i believe that i may reach smaller values by using a thinner plastic

    do you believe that the plastic will melt with coolant ? what kind of plastic are you using ?

    next day, i checked the alignment again, and it was the same ... i am afraid that alignment will get lost if plastic will compress too much over time

    do you have holder you could modify to let you adjust it?
    i don't modify the holder, but simply put those shims underneath it / kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

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