A constant radius for helix with a conical and cylindrical?
A constant radius for helix with a conical and cylindrical?
(OP)
I'm trying to get a constant radius on a thread form to go from a conical to a cylindrical. The thread grinder tells us that he will climb the conical to maintain the radius but I can't get it to model that way. I'm starting on a conical surface and transitioning to a cylinder. Has anyone found a way to keep a constant tangential radius for something of this nature? Thank you.
Mike Aylward
Mike Aylward





RE: A constant radius for helix with a conical and cylindrical?
John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
http://www.siemens.com/plm
http://www.plmworld.org/museum/
To an Engineer, the glass is twice as big as it needs to be.
RE: A constant radius for helix with a conical and cylindrical?
RE: A constant radius for helix with a conical and cylindrical?
For what it's worth... Maybe you could try sketching the base profile and revolving it. Drawing the thread without base edge fillets and draw a helix then sweeping the thread along the helix and filleting the model after thread is swept.
Cheers
Steve Griffiths
If you want to make apple pie from scratch, first you must create the universe!
RE: A constant radius for helix with a conical and cylindrical?
John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
http://www.siemens.com/plm
http://www.plmworld.org/museum/
To an Engineer, the glass is twice as big as it needs to be.
RE: A constant radius for helix with a conical and cylindrical?
John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
http://www.siemens.com/plm
http://www.plmworld.org/museum/
To an Engineer, the glass is twice as big as it needs to be.
RE: A constant radius for helix with a conical and cylindrical?
John, I'm using NX6 and Imperial units. The pitch is .073 with 1.5 turns and the transition is .114 after the start of the cone. I've tried several ways to try this with different outcomes. The picture shows one way I did it but the .018 radius is truncated as it follows the form unfortunately that can't happen.
RE: A constant radius for helix with a conical and cylindrical?
Of course, the actual model (or at least the relevant section) would really help.
John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
http://www.siemens.com/plm
http://www.plmworld.org/museum/
To an Engineer, the glass is twice as big as it needs to be.
RE: A constant radius for helix with a conical and cylindrical?