scallop depth

[dwade]

I have a spherical part that has scallops cut into the OD with a depth from the face to an intersect point. I've measured the scallops and the sphere but cannot get the intersect point. I've tried all of the choices in the point dialog box.

[Paul Sarrach]

Did you line up the part so that the scallop will be true to a view and then are you in that view when you try to get the point?-

[MJBolster]

Misery loves company, Eh?

I also have a situation for which me and a sharp coworker have no solution.
We had a B&S guy here last week for two days of on site training and he seemed like he had answers for everything. If you are under an SMA you could call for applications support or if not help is on the way I'm sure.

Mike

[Paul Sarrach]

[quote=MJBolster] I also have a situation for which me and a sharp coworker have no solution.

What is your situation?

[dwade]

I couldnt measure the scallop as a cylinder so I measured individual points then constructed a cylinder (the feature looked OK on the model). I've rotated the model so I can see where the point should be, I've had no luck getting the constructed (int. of sphere and cyl) point onto the surface of the sphere.

[dccfreak]

Do you have a cad-cam program? I ask because sometimes when it comes to features like this, although PC-DMIS is very powerful, things of this nature tend to take a little bit of time to work around when you could just simply export your measured data into an iges file and verify some of your problem areas in there for time restraints.

I often use Mastercam or Rhino to do things like this and depending on how badly I need this feature to show up in my program, I either use the cad-cam program to verify my math and insert it into the program through assignments, generic features, etc. or I just simply use the dimension given in the cad-cam itself and put it in my report. I only suggest this because to date, I have not seen a problem as far as intersections and creation of features that either of these programs cannot do with just a simple mouse click. They have saved me enormous amounts of time. Just my humble opinion. In my company, if I absolutely don't need to have them in my programs I don't put them in because unfortunately, sometimes my ********* think as soon as you import a CAD model into PC-DMIS, the program is done so they keep piles of production, new design, and development product coming at me, and, of course I have to prepare the PPAP documentation as well. Just another day in paradise!

[dwade]

I was trying to program as much of the part as possible and this is the last thing on the part that is "iffy". If they want it, I ill give it to them, if not then I won't.

Thank you.

[cmmguy]

Too many questions...

Dwayne,
Is the scallop cylindrical or spherical in shape? Do you have a b/p that you can share. Your description of the requirements have left me with too many questions...

[dwade]

J,

There is a pdf attached to the first post on the thread. The scallop is cylindrical and short (about 3.7mm in length). The main body of the part is a large sphere with a face on it. If you need more info I'll scan a larger section of the drawing.

[MJBolster]

I have a conical part with a plane at both ends. there are holes drilled around the diameter about half way up the cone, equally spaced, 12 in all,
piercing to the ID ( the cone is hollow). The cone wall is about 3/8" thick.
The drawing calls out a distance from the center of each hole to the top edge
of the cone. I can construct a circle at the int. of the plane and cone . If I could then intersect the cone and hole (sampled as cylinder) I'd have no issue.
but I cant figure out how to construct any feature where the hole pierces the outside cylinder wall.

[cmmguy]

J,

There is a pdf attached to the first post on the thread. The scallop is cylindrical and short (about 3.7mm in length). The main body of the part is a large sphere with a face on it. If you need more info I'll scan a larger section of the drawing.

Sorry, I missed that pdf. I understand now.

couple choices:
1) use an optical comparator or vision system with Surface illumination.

2) Measure the scallop and find the exact middle and then measure two very small lines on either side of the intersection and make an intersection out of them. construct the distance as required.

3) Measure scallop and find the exact middle and then measure a line down the center of the scallop and intersect that with the sphere. Do the distance from that.