yang686526

help with lining up hole with groove
hello,
on a thick walled pipe there is a radial groove on the inside of the pipe. the groove is dimensioned by a radius and the depth is defined by a dimension outward from the inner diameter of the pipe to the top of the groove. the radius is larger than the dimension from the inner wall so the radius is not a feature of size. the centerline of the groove is dimensioned axially with a toleranced dimension from the end of the pipe.
i would like to drill a hole at 45 deg into the pipe and have the hole line up within .010 positionally with the groove.
can anyone advise on how to set up the gd&t, datums and dimensions to ensure the hole lines up perfectly (.010) with the groove?
robert
eng-tips forums is member supported.
can you put a sketch or simplified version of the drawing, i'm not clear where the radius for the groove comes in.
without fully understanding it, you may be able to use position on the hole and surface profile on the groove.
kenat,
if i understand what you're describing, using a radius to define what is really a diameter is not a good way of dimensioning this part. you are unnecessarily restricting what you can do tolerance-wise. a radius is not a feature of size in any circumstance, it has nothing to do with whatever your reasoning was in your post. is the id of the pipe a stock dimension? if so, controlling the slot's axial location by specifying a depth from the id is a bad idea.
to address the actual question; you can call the width of the slot a datum and then position the hole to it. you will need to set up other datum structure but until you post a simple sketch or something to better illustrate your dilemma, i can't really tell what you're trying to achieve.
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