Golf ball

[Asho Pulsar]

Hi,


Still im struggling to do Golf ball. As perthe part ball_patternuploaded in the files/others/odds and evens i hav done.


I will attach the file can anyone complete the part orhelp me what is the next thing to do.


2007-08-06_032729_golf_ball.prt.zip

 

[Asho Pulsar]

Hi,


Also chech out whats the significance of copy feature in that group.

 

[gkbeer]

Interesting part.

The dimples all have a 5mm sph rad but are set different depths. Different patterns of dimples have the same depth. The overall arrangement is dodecahedron.

 

[Asho Pulsar]

HI,


Actually in that ball_pattern only one pattern is there.Only thing i need is how to do next line of dimples that should be as arranged in that part.

 

[gkbeer]

The dimples are not the same except that they have the same SR. Each has a different depth of cut and the diameter of the edge of the dimple is correspondingly different. In the pic below all dimples that share the same color have the same depth and edge diameter. This cannot be created the way you have started. Even the band around the equator has different depth dimples. This can only be created with spherical dimensioning, and either pattern tables or dim patterns combined with group patterns. Yes move copy can also be made to work. Hint: make sure the joins in the large ball are on the equator so that patterns don't have to cross the surface edges of the ball.

 

[Asho Pulsar]

hi glenn,


In that first pattern all the dimples having same depth 2 inches each.

 

[wsylvester]

same depth 2 inches each





.. remind me to stay away from any golf course you plan on playing at

 

[Asho Pulsar]

Hey Wsylvester,


whats the thing u come about to say? I need same sized dimples all around the ball.

 

[wsylvester]

oh... the depth being 2 inches... It just made me think of this giant golf ball with 2 in. deep dimples....whats the dia. 2 feet

 

[Asho Pulsar]

ok its just a sample, interpret the dimensions into MKS.

 

[sanjeevkar1]

oh... the depth being 2 inches... It just made me think of this giant golf ball with 2 in. deep dimples....whats the dia. 2 feet

ball dia 2 feets


can u imagine the golf stick????

 

[sureshdesigns]

please try the part atleast once.

 

[gkbeer]

So what is the test of modeling this part? Trying to create all the dimples in one pattern using a particular technique? Just accurately recreating it? What?

 

[Asho Pulsar]

we will get some idea abt pattern on spherical surface. one more thing we can do in this, using curve by equation.


In golf ball, one dimple at the centre top most of the sphere surrounded by hexgonal shaped dimples and so on.


Any equation for doing this, i think it must hav an equation but its cumbersome to find.


Please try to find that one alternatively.

 

[gkbeer]

we will get some idea abt pattern on spherical surface. one more thing we can do in this, using curve by equation.


In golf ball, one dimple at the centre top most of the sphere surrounded by hexgonal shaped dimples and so on.


Any equation for doing this, i think it must hav an equation but its cumbersome to find.


Please try to find that one alternatively.

Ok, but there are no patterns of six.

The dimples are all in patterns of five. It just looks like there are patterns of six when viewed from a specific orientation.

If you were to map the dimples onto a Mercator projection, it would be easier to see. Look the pic I put up. For any given dimple there is a pattern of 5 at that same latitude arranged around the axis exactly 72 deg apart. At some latitudes there are two patterns of 5 interlaced with each other. The green dimples do that and the clustering that occurs makes what looks like hexagonal patterns.

The problem with trying to create a pattern like that, one based on hex's, is when the pattern is itself patterned around the sphere. The patterns overlap causing problems.

 

[Asho Pulsar]

So we cannot able to create similiar to Golf ball dimples arrangement. I want all the dimples should be same size and depth also with same pattern.

 

[Dell_Boy]

Glenn's screen shot looks like it was taken from the STEP file I uploaded to the Pro/Files section.

It was deliberately done with varying dimple diameters for the extra degree of difficulty and is representative of the ball I had on my desk at the time. The finished Pro/E part has a total of 294 features and was only missing the North and South pole dimples. They were never completed for the sole reason that they could not be tidily included in the single super-pattern

The dimples were created by doing a pattern-to-table of 1/5 of the dimples and then group patterning this around the circumference. The columns of the family table were simply latitude, longitude, and dimple diameter. To change the dimple spherical radius would have been a simple matter of adding a fourth column. To make the dimple diameter constant would have only required 2 columns and hence much easier.


DB

Forgive me but it really does bring a smile to my face when I see the results of other people's struggle with a part like this.


Edited by: Dell_Boy

 

[gkbeer]

A table? and only 295 features. I count 340 dimples unless my math is hosed up.

 

[Dell_Boy]

There are 360 dimples and 294 features. Think about it and you might realise something significant

 

[Asho Pulsar]

Actual golf ball has 500 dimples n diaapproximately 2 inch.