Move a tilted hole

[[Lo...]]

I hope I can explain this clearly and that someone has had this issue before and found a way to fix it.

I have a part that has a through hole: depth 2mm, Ø1mm, tilted at 18°.

Production has left a machining allowance before the finish on grinding machine, and they have made a starting hole Ø1.00 depth 1mm. In the sketch is drawn in red colour (black outline is the actual part).
They asked to me if the starting hole is in True Position (assuming that the tilt is correct)
On Cad model I define circle on a cylinder ( black outline Ø 1.00mm ), after that, how can I move the circle ( outside the 3D model ) along its axis until I reach the hole with red outline?
Obviously the traslated circle must provide new nominal coordinates to get True Position in that point.

Thanks for all your assistance.

sketch.jpg

[[Ma...]]

First off, I wouldn’t use a circle. I would use a cylinder to measure the starting hole. I would do this for several reasons.

1. You can control the nominal 18 degree angle using the A1, A2 input
2. The TP of a circle assumes the projection on the 18 degrees. Now if you rotate the alignment to 18 degrees then you can report the circle’s deviation to the nominal rotation angle.

Be sure to use Clearance Distance in the measurement strategy to allow for the additional stock. The Clearance Distance value will position the stylus to travel normal to the feature axis, in this case the 18 degrees.

Mark

[[Da...]]

Lorenzo, is that datum B absolutely needed like that? And, you are expressing the drawing in ISO, right?

[[Lo...]]

Datum B gives the distance from the hole to plane.
Starting hole is just 1.5mm deep, there isn't enough space to probe cylinder. I think that the circle is the only way, but I don't want to make a mistake.

[[SH...]]

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You must measure cylinder, true position control location and orientation. Using circle you can control only location can't the orientation.
Do you have 0.8mm or 0.5mm probe??

[[Lo...]]

Shabu,
currently I have a Ø0.8mm- MLE 4.8 probe

[[Ma...]]

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If you do not have enough depth for a cylinder Then you must measure a circle in one of two ways

1. I would create an additional alignment rotated to the 18 degrees and measure a diameter to that alignment

Or

2. measure the feature to the base alignment and then within the TP dialog construct a rotated 18 degree alignment.

Mark

[[An...]]

See attached.

Contribution_14_04_2020.pdf