Twisting a Spiral

Is it possible to twist a Spiral (Helix) around a cylinder that has a
slight revolved shape to it? Does there a Power Point, or any other
tutorial Exist that would demonstrate the principle, maybe? Wrapping
a Helicoil around a straight shank as in cutting or extruding a
threaded bolt is not a problem for me, but never have I done it with
the shank having an irregular shape. I do not remember ever having
covered this in my training, or I have missed something here. Cannot
find any thing that resembles this situation in my books.
I would welcome any advice from the many skilled people here on this.
Thanking you,
Erika Layne

 

I've got an example of this on my website. The site is getting a little
old and rickety, looks like some broken links, but you can still get the
part, and it should show you what you need to know.

mysite.verizon.net/mjlombard

Go to the SWParts link, and its the one with the caption that says
"Things you shouldn't do with sheet metal". It's actually a sheetmetal
part, but it uses a spiral around a non-cylindrical shape.

Matt

 

Hi Erika

I'm not sure I can visualise "cylinder that has a slight revolved shape
to it"

There is a swept helix around a Hour Glass that I modelled to help
someone some time ago on my website. This may be of some use let me know
if it isn't.

http://www.solidengineering.co.nz/help/Hourglasshelixcut.zip

John Layne
www.solidengineering.co.nz

 

If John and Matt's examples don't do it for you, try Mike Wilson's site,
where there are a number of parts that might help.
http://www.mikejwilson.com/solidworks/solidworks_files.htm

Jerry Steiger
Tripod Data Systems
"take the garbage out, dear"

 

I made a quick tutorial Flash video yesterday, if anyone else is interested.

The Flash file is reasonably large, 20Mb, so I hope you have broadband!

http://www.solidengineering.co.nz/help/HourGlassHelixSweep/HourGlassHelixSweep.html

The part file associated with the tutorial is

http://www.solidengineering.co.nz/help/HourGlassHelixSweep/HourGlassHelixSweep.zip