Hi,

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Adrian Mariano

Fri, Jan 7, 2022 5:37 PM

As noted already, sqrt(2) is correct. But the explanation was a bit

terse. The reason is that you have a square defined by the radius of the

circle, and the space between the circles needs to be the diagonal of the

square, which is sqrt(2) times the side length.

On Fri, Jan 7, 2022 at 12:09 PM fred via Discuss discuss@lists.openscad.org

wrote:

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From: fred fred_dot_u@yahoo.com

To: OpenSCAD general discussion discuss@lists.openscad.org

Cc:

Bcc:

Date: Fri, 7 Jan 2022 17:08:44 +0000 (UTC)

Subject: [OpenSCAD] how to calculate parameter?

$fn = 60;

dia = 15;

t_factor = 1.4;

circle(dia);

translate([t_factor * dia, 0, 0])

color("blue")

circle(dia);

translate([-t_factor * dia, 0, 0])

color("green")

circle(dia);

[image: Inline image]

I've not performed any tests on the current t_factor (translate factor) as

it's more-or-less a rough eyeball guess. I've forgotten most of my high

school trigonometry/geometry (last century) and am not certain that what I

knew would help me here.

I'd like to know what formula to use to calculate the x-translation that

results in the green and blue circles to split the yellow circle's

circumference into quarters. The final objective is to create a shape which

when duplicated and rotated will be tiled without gaps.

[image: Inline image]

This is the shape which results from using sqrt(2) as the translation

factor. I expect that this is the correct answer, but I only stumbled on

it. It's been my experience that sometimes a calculation falls into one of

the "standard" references in the world.

Can someone explain the development that would confirm this as the correct

calculation?

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From: fred via Discuss discuss@lists.openscad.org

To: OpenSCAD general discussion discuss@lists.openscad.org

Cc: fred fred_dot_u@yahoo.com

Bcc:

Date: Fri, 7 Jan 2022 17:08:44 +0000 (UTC)

Subject: [OpenSCAD] how to calculate parameter?

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As noted already, sqrt(2) is correct. But the explanation was a bit
terse. The reason is that you have a square defined by the radius of the
circle, and the space between the circles needs to be the diagonal of the
square, which is sqrt(2) times the side length.
On Fri, Jan 7, 2022 at 12:09 PM fred via Discuss <discuss@lists.openscad.org>
wrote:
>
>
>
> ---------- Forwarded message ----------
> From: fred <fred_dot_u@yahoo.com>
> To: OpenSCAD general discussion <discuss@lists.openscad.org>
> Cc:
> Bcc:
> Date: Fri, 7 Jan 2022 17:08:44 +0000 (UTC)
> Subject: [OpenSCAD] how to calculate parameter?
> $fn = 60;
> dia = 15;
> t_factor = 1.4;
> circle(dia);
> translate([t_factor * dia, 0, 0])
> color("blue")
> circle(dia);
> translate([-t_factor * dia, 0, 0])
> color("green")
> circle(dia);
>
> [image: Inline image]
>
> I've not performed any tests on the current t_factor (translate factor) as
> it's more-or-less a rough eyeball guess. I've forgotten most of my high
> school trigonometry/geometry (last century) and am not certain that what I
> knew would help me here.
>
> I'd like to know what formula to use to calculate the x-translation that
> results in the green and blue circles to split the yellow circle's
> circumference into quarters. The final objective is to create a shape which
> when duplicated and rotated will be tiled without gaps.
>
> [image: Inline image]
> This is the shape which results from using sqrt(2) as the translation
> factor. I expect that this is the correct answer, but I only stumbled on
> it. It's been my experience that sometimes a calculation falls into one of
> the "standard" references in the world.
>
> Can someone explain the development that would confirm this as the correct
> calculation?
>
>
>
>
>
> ---------- Forwarded message ----------
> From: fred via Discuss <discuss@lists.openscad.org>
> To: OpenSCAD general discussion <discuss@lists.openscad.org>
> Cc: fred <fred_dot_u@yahoo.com>
> Bcc:
> Date: Fri, 7 Jan 2022 17:08:44 +0000 (UTC)
> Subject: [OpenSCAD] how to calculate parameter?
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email to discuss-leave@lists.openscad.org
>

F

fred

Fri, Jan 7, 2022 7:44 PM

@Adrian Mariano,

Your image has cleared everything up. I'm ashamed to consider that I wasn't able to get the synapses firing in the right path to figure that out on my own. In high school, algebraic proofs were fun, now I'm lucky to figure out a = b ... 1 = 2 anymore.

Thanks everyone for the assist.

On Friday, January 7, 2022, 12:37:50 PM EST, Adrian Mariano avm4@cornell.edu wrote:

As noted already, sqrt(2) is correct. But the explanation was a bit terse. The reason is that you have a square defined by the radius of the circle, and the space between the circles needs to be the diagonal of the square, which is sqrt(2) times the side length.

On Fri, Jan 7, 2022 at 12:09 PM fred via Discuss discuss@lists.openscad.org wrote:

---------- Forwarded message ----------

From: fred fred_dot_u@yahoo.com

To: OpenSCAD general discussion discuss@lists.openscad.org

Cc:

Bcc:

Date: Fri, 7 Jan 2022 17:08:44 +0000 (UTC)

Subject: [OpenSCAD] how to calculate parameter?

$fn = 60;

dia = 15;

t_factor = 1.4;

circle(dia);

translate([t_factor * dia, 0, 0])

color("blue")

circle(dia);

translate([-t_factor * dia, 0, 0])

color("green")

circle(dia);

I've not performed any tests on the current t_factor (translate factor) as it's more-or-less a rough eyeball guess. I've forgotten most of my high school trigonometry/geometry (last century) and am not certain that what I knew would help me here.

I'd like to know what formula to use to calculate the x-translation that results in the green and blue circles to split the yellow circle's circumference into quarters. The final objective is to create a shape which when duplicated and rotated will be tiled without gaps.

This is the shape which results from using sqrt(2) as the translation factor. I expect that this is the correct answer, but I only stumbled on it. It's been my experience that sometimes a calculation falls into one of the "standard" references in the world.

Can someone explain the development that would confirm this as the correct calculation?

---------- Forwarded message ----------

From: fred via Discuss discuss@lists.openscad.org

To: OpenSCAD general discussion discuss@lists.openscad.org

Cc: fred fred_dot_u@yahoo.com

Bcc:

Date: Fri, 7 Jan 2022 17:08:44 +0000 (UTC)

Subject: [OpenSCAD] how to calculate parameter?

OpenSCAD mailing list

To unsubscribe send an email to discuss-leave@lists.openscad.org

OpenSCAD mailing list

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@Adrian Mariano,
Your image has cleared everything up. I'm ashamed to consider that I wasn't able to get the synapses firing in the right path to figure that out on my own. In high school, algebraic proofs were fun, now I'm lucky to figure out a = b ... 1 = 2 anymore.
Thanks everyone for the assist.
On Friday, January 7, 2022, 12:37:50 PM EST, Adrian Mariano <avm4@cornell.edu> wrote:
As noted already, sqrt(2) is correct. But the explanation was a bit terse. The reason is that you have a square defined by the radius of the circle, and the space between the circles needs to be the diagonal of the square, which is sqrt(2) times the side length.
On Fri, Jan 7, 2022 at 12:09 PM fred via Discuss <discuss@lists.openscad.org> wrote:
---------- Forwarded message ----------
From: fred <fred_dot_u@yahoo.com>
To: OpenSCAD general discussion <discuss@lists.openscad.org>
Cc:
Bcc:
Date: Fri, 7 Jan 2022 17:08:44 +0000 (UTC)
Subject: [OpenSCAD] how to calculate parameter?
$fn = 60;
dia = 15;
t_factor = 1.4;
circle(dia);
translate([t_factor * dia, 0, 0])
color("blue")
circle(dia);
translate([-t_factor * dia, 0, 0])
color("green")
circle(dia);
I've not performed any tests on the current t_factor (translate factor) as it's more-or-less a rough eyeball guess. I've forgotten most of my high school trigonometry/geometry (last century) and am not certain that what I knew would help me here.
I'd like to know what formula to use to calculate the x-translation that results in the green and blue circles to split the yellow circle's circumference into quarters. The final objective is to create a shape which when duplicated and rotated will be tiled without gaps.
This is the shape which results from using sqrt(2) as the translation factor. I expect that this is the correct answer, but I only stumbled on it. It's been my experience that sometimes a calculation falls into one of the "standard" references in the world.
Can someone explain the development that would confirm this as the correct calculation?
---------- Forwarded message ----------
From: fred via Discuss <discuss@lists.openscad.org>
To: OpenSCAD general discussion <discuss@lists.openscad.org>
Cc: fred <fred_dot_u@yahoo.com>
Bcc:
Date: Fri, 7 Jan 2022 17:08:44 +0000 (UTC)
Subject: [OpenSCAD] how to calculate parameter?
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