Tapped or NPT holes on curve surface

[overkill04]

Hi all.

What is the best way to created a threaded feature which starts on a curved surface and cuts into a solid.

I tried creating a surface tangent to the solid and then create a sketch point to use as my center point for the hole. But I get an error that says something about the sketch point not being fully constrained, even though my sketch point is fully constrained?

Does solid works need a flat surface to create threaded holes?

 

[CorBlimeyLimey]

How Do I Use The Hole Wizard On A Cylindrical Face? faq559-1150

 

[SolidAir]

CorBlimeyLimey,

I read the FAQ over, the 2D part does not apply to a HW feature on a curved surface. The sketch will always be 3D. I see you edited it today, what changes did you make?

SA

 

[CorBlimeyLimey]

I just noticed that the cross-referenced faq at the bottom referred to the same faq.

 

[CorBlimeyLimey]

SolidAir ... thank your for pointing out the 2D/3D discrepancy in the faq. I have corrected the headings and added an explanation.

 

[handleman]

From a practical standpoint you may want to consider making a flat for the NPT thread. I put a pipe tap into a cylindrical surface once. I was encouraged by our assembly technicians to avoid that practice in the future. It makes it more difficult to get a good seal, especially if you're trying to put brass fittings into a steel part.

 

[fcsuper]

I concur with handleman. Don't put NPT's on curved surfaces. You are depending on the first 3 to 4 threads to make the seal, and if it is on a curved surfaces, you lose almost all of them. Also, it's a harder to start threading something into any thread on a curved surface, especially NPT's.



Matt
CAD Engineer/ECN Analyst
Silicon Valley, CA

http://sw.fcsuper.com/index.php

 

[SolidAir]

CorBlimeyLimey,

My intent is to not sound critical but why include the following at all?

The difference between the Pre and Post selection methods is the type of sketch produced for the Point placement;
Pre with a planar surface --> 2D sketch
Pre with a non-planar surface --> 3D sketch
Post with a planar or non-planar surface --> 3D sketch

The FAQ, after all, is about putting a Hole Wizard feature on a cylindical face (I believe it also applies to any non-planer face as I have put hole wizard features in spline faces and ellipse faces the same way). A user will not be selecting a planer surface so you will never get a 2D sketch. I feel this information could be confusing to a new user and should be taken out. Is this correct or am I missing something? Maybe I am the only one confused?

SA

 

[CorBlimeyLimey]

It's just a little snippet of related information I found interesting so thought others might. If others let me know they find it confusing, I will gladly remove it.