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Thread: Beautiful Flycutting

  1. #11
    Supporting Member Crusty's Avatar
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    I thought I was setting the head using a quicker method (using the tools I have available) but now I understand that I wasn't checking the spindle axis to table perpendicularity. Somewhere I have an indicator beam and arbor to mount it in the spindle - I need to find it. Thanks.

    The difference I see in opposite directions is perplexing but it being due to slop somewhere seems like the right trail to follow to me.
    If you can't make it precise make it adjustable.

  2. #12
    Supporting Member Toolmaker51's Avatar
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    Another part of tramming is to extend the quill; that doesn't change the angularity, just magnifies it. When you retract to mill, the error will be lessened.
    When I tram, it's over well matched 1-2-3 blocks. It's then easier to swing a larger circle and X or Y for the difference. On Bridgeport pattern mills, do the 'nod' or Y axis first, then X, and recheck Y.
    The only instrument I use; Indicol clamp, Interapid test indicator. If it needs to 'perfect', I extend the clamp/ indicator far as they will go.
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  3. #13
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    Quote Originally Posted by Toolmaker51 View Post
    Another part of tramming is to extend the quill; that doesn't change the angularity, just magnifies it. When you retract to mill, the error will be lessened.
    Could you elaborate on that, I think that I must be misreading it because extending the quill would have no effect.

  4. #14
    Supporting Member Toolmaker51's Avatar
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    With the joint of a mill to nod or swivel, that creates a point of rotation. Lengthening distance [hypotenuse] from indicator point to that center, like a sine bar, angle doesn't change but the side opposite 'expands' so indicator will detect out of perpendicularity.
    I'm describing as if a right angle, but the condition is more truly scalene cone until quill is at a right angle, thereby an isosceles.


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    Sincerely,
    Toolmaker51
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