Pitch Circle Representation in drawings.

[Howard Wilkins]

When converting a model to a 2d orthographic drawing how to you represent dimensions of circular pitched holes on the 2d view with a PCD? I am not able to lock on to the PCD centre in order to use the centre line tool.

[JD Mather]

Attach what you have so far.

[Howard Wilkins]

Hi, I don't have anything to show you at present. That job is done!
Imagine a block 40 x 40 x 10 (mm) with 3 off 3mm holes drilled in the front face equispaced on a 15mm pcd. The centre of the pitch circle is 18mm from the base line and on the vertical centre line. How can I draw the PCD on that view? Inventor will not allow be to pick up that PCD centre position. Help would be appreciated for next time!

[JD Mather]

Imagine a block 40 x 40 x 10 (mm) with 3 off 3mm holes drilled in the front face equispaced on a 15mm pcd. The centre of the pitch circle is 18mm from the base line and on the vertical centre line. Help would be appreciated ...

I don't have to imagine anything. I know exactly how to do it. Why couldn't you simply draw what you just described and attach it here so that I can demonstrate the solution for you. That is exactly what I would have to do - draw the part. Do it, attach it, and I will record an animation in idw of how to create your PCD.

Extract and open the attached animated GIF with your web browser to see at least one method (assuming I imagined your problem correctly).

[arusho]

Nm I see the .gif

[JD Mather]

Here is another method that does not require retrieving the model sketch. The disadvantage to this method is no centermark in the PCD.

[Howard Wilkins]

Superb! Many thanks for that.

[Hickoz_bro]

Here is another method that does not require retrieving the model sketch. The disadvantage to this method is no centermark in the PCD.

JD - that's the dodgy way of doing it (but you already know that)

The method you've used: select centre line tool - select hole 1- hole 2 - hole 3 - right click - create - extend end point

The correct method: select centre line tool - select hole 1 - hole 2 - hole 3 - hole 1 again

you'll see why if you try it.