Boolean operation for hole

[SiW979]

Could someone please explain why the hole operatio has the option to create a hole without using the subtract boolean operation? I've never figured out why.

Thanks

Si

Best regards

Simon NX7.5.4.4 MP5 - TC 8

http://www.jcb.com

 

[cubalibre000]

You can create “positive” holes without specifying target bodies for them.
This can be useful when the target body has not yet been specified or is not yet present in the part, but your hole templates are ready.
Positive holes are solid bodies, and are created from the Hole dialog box using None for the Boolean and Along Vector for the hole direction.
Positive holes can include symbolic (internal) threads, which will later update correctly when a target solid body is available and specified for the hole, and the Boolean is changed to Subtract.


Thank you...

Using NX 8 and TC8.3

 

[Toost]

I have not yet seen the need for this myself , but you can add detail/ add features to the hole and finally subtract it using the "regular" subtract. Would , in cast parts, the possibility to link the positive/ negative hole add any benefits ? ( where one needs to define the cast shape in one part and the machined shape in another part.)

 

[phillpd]

It's so that you can make use of Instance Geometry, rather than Instance Feature.

NX 6.0.5.3 (NX 8 Testing)
Windows 7 64

 

[SiW979]

when I select none for the boolean option, it still asks me to specify a target bodt though.

Best regards

Simon NX7.5.4.4 MP5 - TC 8

http://www.jcb.com

 

[JohnRBaker]

It may ask you to select a body, but it's not required.

One application which comes to mind where this can be useful is when designing something like a hydraulic manifold where you drill a series of holes into a block of steel which creates a network of passages and ports. While you could do something like this by sketching profiles and doing extudes or revolves, or even defining a series of primitive cylinders (now that I can parametrically control their origins and directions) have a model consisting of features which can easily be specified in terms which would directly relate to the manufacturing process which will be used to actually create the product does provide a certain level of elegance as well as to clearly establish your design intent in a manner easily understood by those responsible for the manufacturing process.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

To an Engineer, the glass is twice as big as it needs to be.