When you bore the hole can you machine some flats on either side as a 
reference?

JT

On 3/30/2017 6:02 AM, andy pugh wrote:
> If you have a part with a large bore through the middle, how do you
> set up to machine a hole exactly perpendicular to the axis of that
> bore?
>
> I imagine that this is quite a common problem, so must have a common solution?
>
> My particular setup puzzle is analagous to this, except that I will be
> using the horizontal spindle.
>
> Machining this casting: https://goo.gl/photos/6QhNnqjzRuSJJpva7
>
> The order of operations will be, starting with the raw casting:
> 1) with the large flat face clamped down to the table machine the base flat.
> 2) Now clamp the base to the table, face off the large flat face and
> machine the large bore.
> 3) Return to the original setup and machine a key-slot in the base
> _exactly_ on the axis of the large bore.
>
> 3) is the problem. I can indicate the base to make sure that is
> perpendicular to the spindle axis, but how do I make sure that the
> bore axis and the spindle axis intersect?
>


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