I had posted a response and an example file to an older
thread regarding conics in SW08 suggesting a possible solution for
those looking for an editible conic sketch function. I was also
hoping for confirmation since I hadn't had the time to run anything
at that point. Since then I have modeled an aspheric lens with data
supplied from one of our vendors and ran the optical design
software. The focal length calculation matches for the lens I
modeled.

WooHoo a data point of one. I'd say I'm good to go. Anyway, for anybody wanting to try conic sketches as guide curves or whatever in SW09 without using a DT or API, this is what I did:

The formula is y=(x^2/R)/(1+(1-(1+b)/(x/R)^2)^.5)

where x = the start and end points ( 0 and the lens diameter /2)

R = the lens prescription radius

b = the conic constant (Rho)

For a sphere the conic = 0; for an Ellipse 0>b>-1; for a Parabola b = -1; and for a Hyperbola b< -1

I found the formula at this telescope design website:

"> http://bi-staff.beckman.uiuc.e...s_info.html

WooHoo a data point of one. I'd say I'm good to go. Anyway, for anybody wanting to try conic sketches as guide curves or whatever in SW09 without using a DT or API, this is what I did:

The formula is y=(x^2/R)/(1+(1-(1+b)/(x/R)^2)^.5)

where x = the start and end points ( 0 and the lens diameter /2)

R = the lens prescription radius

b = the conic constant (Rho)

For a sphere the conic = 0; for an Ellipse 0>b>-1; for a Parabola b = -1; and for a Hyperbola b< -1

I found the formula at this telescope design website:

"> http://bi-staff.beckman.uiuc.e...s_info.html

Like I said in the sub-title and I found in the quick search I did, only a few people said they would like to have the feature.

I created an ehancement request. Search for "conic" or "hyperbola". I also created one for tangents to conics, since you can only do it to a circle and an ellipse right now.

The hyperbola request is ER# 1-1413855312

The tangents to conics request is ER# 1-1414911712

I think you've made your point with the multiple posts Emilio. There are a lot of threads relating to conics and I tend to throw my opinion in there most times. I haven't given up the hope but accurate conic section surfaces and rho driven sketches are not as straight forward as we'd like them to be. The priority on the SPR for conic creation is tagged as "low". This thread might explain more:

https://forum.solidworks.com/thread/22556

Harold

I was surprised that I searched for ERs and saw none. Evidently now they've been "moved" to SPRs?

Anyway, since there are multiple posts on conics, I posted on all of them. It's not about making a point, it's about making it visible. Too bad moderators don't actively merge threads here.