Drawing 3D internal threads

[williamS]

My first posting on CADTutor and I've only been using AutoCAD 2010 for the last couple of weeks, so please excuse any ignorance on my part.

 

I've worked through the JD Mather tutorials - absolutely brilliant.

 

Had a thought about creating an internal thread. Create the cut thread as per Tutorial 4 and then create a cavity mold as per Tutorial 7. Haven't tried it yet - going to now.

 

Someone warn me if I'm on the wrong track or is there an simpler method .

[ReMark]

Sounds like a plan. Must be that you're a fast learner and/or the JDM tutorials are that good.

 

Welcome to the CADTutor forums.

[SuperCAD]

Sounds like it will work, although internal threads are slightly different than external threads. There isn't really an easier way of doing threads. JD's tutorials are about the best you'll see.

 

Just out of curiosity what are you drawing that requires threads. People here at work joke that I'm obsessed with drawing a perfect thread so I'd be really interested in seeing what you are drawing.

 

Happy CADing!

[williamS]

Drew the external thread and then subtracted it from an enclosing box - seems to work OK.

 

Drawing a gearbox cover (attached png - six threaded holes about base - sorry about the quality - very new to rendering and lighting and haven't figured it out as yet).

 

I've just seen a previous thread about a follow up question I was going to ask - is there any point in drawing the internal threads - they didn't seem to come to a consnsus.

[ReMark]

I don't see the point of drawing internal threads unless the drawing has to be highly detailed for a reason. But then again most threaded holes in our drawings have a bolt in them anyway.

[SEANT]

 

I've just seen a previous thread about a follow up question I was going to ask - is there any point in drawing the internal threads - they didn't seem to come to a consnsus.

 

I tend to agree with ReMark that threads should not be included unless they are integral to the design. Screw Jack, perhaps, or Recirculating Ball mechanism, etc.

[JD Mather]

About the only reason to model threads is if you are going to rapid prototype. Occasionally on really large threads I will model for aesthetic pictorial clarity in assembly section - especially if the image is intended for someone not familiar with engineering drawings.

[kencaz]

I tend to agree with most everyone on this... It's really not needed in most drawings.

 

When I need to represent bolts or nuts I use a revolved profile of a thread a just subtract it from a solid to make the internal threads. It's very easy, fast, and you really can't tell the difference from helical threads.

 

 

KC