radius reversal

[tank627]

exactly what does one look like?

 

[ctopher]

a fillet

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 10-27-06)

 

[meintsi]

Picture two opposite arcs (not necessarily the same size radius) meeting end to end and the point of tangency (or radius reversal) between the two.

Remember...
[navy]"If you don't use your head,[/navy]
[navy]your going to have to use your feet."[/navy]

 

[tank627]

so its different than a cusp

 

[meintsi]

THe way I understand it, yes.

A cusp could technically be a (pencil) point.
A radius reversal is a much smoother transition where the direction of curvature changes where the center points lies on opposite sides of the tangency plane.

Hope that makes sense...

Remember...
[navy]"If you don't use your head,[/navy]
[navy]your going to have to use your feet."[/navy]

 

[MechNorth]

Tank627, I'm guessing you're contemplating Controlled Radius vs Radius. Basically Radius Reversals are undulations in the form of the radius. I've tried to sketch out a sample of a radius reversal.

http://www.profileservices.ca/files/tidbits/tidbits_missc.html

Jim Sykes, P.Eng, GDTP-S
Profile Services
CAD-Documentation-GD&T-Product Development

http://www.profileservices.ca

 

[tank627]

i was just crunching the difference of ANSI Y14.5-1982 & ASME Y14.5-1994.

looks like a cusp & reversal are both not allowed in a "CR" or the 1982 version.

 

[MechNorth]

'94 introduced the idea of a Controlled Radius as such; in the '82 version, the definition of Radius was what we now know as a Controlled Radius. There are functional differences between the two (picture a radius on a cam vs an edge-round on a workpiece for handling purposes) and thus the need for differentiating between them.

Jim Sykes, P.Eng, GDTP-S
Profile Services
CAD-Documentation-GD&T-Product Development

http://www.profileservices.ca

 

[ctopher]

Not sure if this helps.

Chris
Systems Analyst, I.S.
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 10-27-06)