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Tennisball challenge

Posted by Replace 
Tennisball challenge
March 28, 2016 03:20AM
I would like to create a tennisball, (Not actually to play tennis :-)

So the challenge is to find a formula to subtract the specific tennis ball lining from the ball's sphere surface.

One idea I have is to subtract a partially sunk small sphere from the surface of the spere and than translate that smal sphere according to a formula that describes the specific line.

Impossible ?

Thomas

Edited 1 time(s). Last edit at 03/28/2016 03:20AM by Replace.

www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)
Re: Tennisball challenge
March 28, 2016 01:29PM
Are you thinking about something like this?



Here is the OpenScad source I used for the above:
module tennisball(
   r, // radius of tennis ball
   s, // width of seem
   d, // deepening of seem
   a, // skew angle
   ){
   ca=cos(a);
   f=sqrt(2-ca*ca)/ca;
   difference(){
      sphere(r);
      for(a1=[[0,0,0],[0,90,180]])rotate(a1)
      for(sz=[-1,1])scale([1,1,sz])
      difference(){
         rotate([a,0,0])cylinder(r1=0,r2=(r+1)*f+s/2*f,h=r+1); 
         rotate([a,0,0])cylinder(r1=0,r2=(r+1)*f-s/2*ca,h=r+1);
         translate([-r,0,0])cube([2*r,2*r,2*r]);
      }
   }
   color("red")sphere(r-d);
}

tennisball(r=50,s=10,d=1,a=25);

Edited 2 time(s). Last edit at 03/28/2016 10:57PM by enif.
Re: Tennisball challenge
March 29, 2016 06:04AM
Yessss.. great
thanks !

I will give you credit on Thingiverse when I use it ! thumbs up

Thomas


www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)
Re: Tennisball challenge
March 30, 2016 10:13AM
Here it is :-)

Knob


www.3daybreaker.blogspot.com

Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)
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