Dimensioning holes from datums

[tombuff]

Using the Hole commad, I want to locate/reference off datums, this is something I can do in Pro-E.  It's not a choice, that I can find, or am I missing something????

Thanks, Tom

[cbenner]

Like so?

[tombuff]

I see what your doing but I mean the feature located off a datum plane, looks like this is off the physical part itself.

[mrattray]

Can you provide an image or a better explanation of what you're trying to do?

[JDMather]

Start a sketch and Project Geometry the origin planes.

I think the easiest way to place holes in Inventor is with sketch points.

I think this is what the OP is after.

In Creo (Pro/E if you select a face to place a hole you get these two grips that you can drag to snap to planes.

In this image I have attached one of them and a dimension appears to enter offset), in the process of dragging the second...

I find it far far easier to use sketch points and normally dimension to the origin rather  than cluttering screen by projecting planes.

[tombuff]

I'm away from my from my Inventor Computer, but I'll snip a picture of what I mean tonight.  I'm an Inventor newbie and think Pro-E, it may be a mater of projecting the datums to have them to dimension from.  I'm just used to (in Pro-E) being able to dimension a feature using a datum plane as the "from reference" either a primamry or working planes.

[mrattray]

By "datum planes" are you referring to the origin geometry? In that case I think your safest bet would be to use a sketch, per JD's suggestion. The origin point should project into the sketch automatically, making it quick and easy to constrain your hole points to the origin.

[swalton]

Datum Features in ProE are Workfeatures in IV.

IV does not allow you to drag a dimension to a workfeature the way the ProE allows you to drag one to a datum plane.

If you want to constrain a hole to a work feature, you must first create a sketch and then project the workfeature onto the sketch.  Next, place a point on the sketch and dimension from the projected geometry to the point.  Finish the sketch and start the hole feature.  The hole feature will pick up the point in the sketch to locate the hole.

[mrattray]

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@swalton wrote:

Datum Features in ProE are Workfeatures in IV.

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That was my point of confusion, thanks. When I hear "datum" all I can think of is GD&T.