Trouble with the curve

Re: Trouble with the curve

andy.wpg — Tue, 23 Jan 2018 08:01:20 -0500

Quote
enif
I tried to understand what exactly you are trying to build... Is it something like this?

If so, I built it as the intersection of a cube with the difference of 2 cylinders as follows:
module cylbezel(
   l, // length
   h, // height
   w, // thickness
   a  // arch rise (y-offset in center, >0)
   ){

   //compute radius from arch rise
   r=l*l/(8*a)+a/2;

   intersection(){
      translate([-l/2,0,0])cube([l,a+w,h]);
      translate([0,r,-1])difference(){
         cylinder(r=r,h=h+2);
         cylinder(r=r-w,h=h+2);
      }
   }
}




cylbezel(l=100,h=50,w=0.8,a=15,$fn=360);

EXACTLY! Thank you so much, and sorry about the poor description.

Re: Trouble with the curve

enif — Tue, 23 Jan 2018 03:13:23 -0500

I tried to understand what exactly you are trying to build... Is it something like this?

If so, I built it as the intersection of a cube with the difference of 2 cylinders as follows:

module cylbezel(
   l, // length
   h, // height
   w, // thickness
   a  // arch rise (y-offset in center, >0)
   ){

   //compute radius from arch rise
   r=l*l/(8*a)+a/2;

   intersection(){
      translate([-l/2,0,0])cube([l,a+w,h]);
      translate([0,r,-1])difference(){
         cylinder(r=r,h=h+2);
         cylinder(r=r-w,h=h+2);
      }
   }
}

cylbezel(l=100,h=50,w=0.8,a=15,$fn=360);

Trouble with the curve

andy.wpg — Mon, 22 Jan 2018 15:32:10 -0500

I am attempting to make a bezel with HDglass. I know that it will never be optic clear, but some tests with the 10W leds I will be using shows the light transmission is perfect for what I need.

The bezel is 100mm long (x axis), 50mm high (z axis) and 0.8mm thick (y axis). What I would like to do is bend the face of it. So, the x-axis would be curved a bit around the z axis.

I understand how to use a difference to remove the back of a cube with a cylinder. What I don't know how to do is curve the face of the block so that it is a consistent thickness the whole way.

I assume it uses a function that I have not yet been able to discover yet.

Can anyone give any assistance on this?

Thanks

Andy