screw_drive.scad

LibFile: screw_drive.scad

Masks for Phillips, Torx and square (Robertson) driver holes.

To use, add the following lines to the beginning of your file:

include <BOSL2/std.scad>
include <BOSL2/screw_drive.scad>

File Contents

1. Section: Phillips Drive

   • phillips_mask() – Creates a mask for a Philips screw drive. ^[Geom]
   • phillips_depth() – Returns the depth a phillips recess needs to be for a given diameter.
   • phillips_diam() – Returns the diameter of a phillips recess of a given depth.

2. Section: Hex drive

   • hex_drive_mask() – Creates a mask for a hex drive recess. ^[Geom]

3. Section: Torx Drive

   • torx_mask() – Creates a mask for a torx drive recess. ^[Geom]
   • torx_mask2d() – Creates the 2D cross section for a torx drive recess. ^[Geom]
   • torx_info() – Returns the dimensions of a torx drive.
   • torx_diam() – Returns the diameter of a torx drive.
   • torx_depth() – Returns the typical depth of a torx drive recess.

4. Section: Robertson/Square Drives

   • robertson_mask() – Creates a mask for a Robertson/Square drive recess. ^[Geom]

Section: Phillips Drive

Module: phillips_mask()

Synopsis: Creates a mask for a Philips screw drive. ^[Geom]

Topics: Screws, Masks

See Also: hex_drive_mask(), phillips_depth(), phillips_diam(), torx_mask(), robertson_mask()

Usage:

• phillips_mask(size) [ATTACHMENTS];

Description:

Creates a mask for creating a Phillips drive recess given the Phillips size. Each mask can be lowered to different depths to create different sizes of recess.

Arguments:

By Position	What it does
size	The size of the bit as an integer or string. "#0", "#1", "#2", "#3", or "#4"

By Name	What it does
anchor	Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin	Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient	Vector to rotate top towards, after spin. See orient. Default: UP

Example 1:

include <BOSL2/std.scad>
include <BOSL2/screw_drive.scad>
xdistribute(10) {
   phillips_mask(size="#1");
   phillips_mask(size="#2");
   phillips_mask(size=3);
   phillips_mask(size=4);
}

---

Function: phillips_depth()

Synopsis: Returns the depth a phillips recess needs to be for a given diameter.

Topics: Screws, Masks

See Also: phillips_mask(), hex_drive_mask(), phillips_diam(), torx_mask()

Usage:

• depth = phillips_depth(size, d);

Description:

Returns the depth of the Phillips recess required to produce the specified diameter, or undef if not possible.

Arguments:

By Position	What it does
size	size as a number or text string like "#2"
d	desired diameter

---

Function: phillips_diam()

Synopsis: Returns the diameter of a phillips recess of a given depth.

Topics: Screws, Masks

See Also: phillips_mask(), hex_drive_mask(), phillips_depth(), torx_mask()

Usage:

• diam = phillips_diam(size, depth);

Description:

Returns the diameter at the top of the Phillips recess when constructed at the specified depth, or undef if that depth is not valid.

Arguments:

By Position	What it does
size	size as number or text string like "#2"
depth	depth of recess to find the diameter of

---

Section: Hex drive

Module: hex_drive_mask()

Synopsis: Creates a mask for a hex drive recess. ^[Geom]

Topics: Screws, Masks

See Also: phillips_mask(), torx_mask(), phillips_depth(), phillips_diam(), robertson_mask()

Usage:

• hex_drive_mask(size, length, [anchor], [spin], [orient], [$slop]) [ATTACHMENTS];

Description:

Creates a mask for hex drive. Note that the hex recess specs requires a slightly oversized recess. You can use $slop to increase the size by 2 * $slop if necessary.

---

Section: Torx Drive

Module: torx_mask()

Synopsis: Creates a mask for a torx drive recess. ^[Geom]

Topics: Screws, Masks

See Also: phillips_mask(), hex_drive_mask(), phillips_depth(), phillips_diam(), robertson_mask()

Usage:

• torx_mask(size, l, [center]) [ATTACHMENTS];

Description:

Creates a torx bit tip. The anchors are located on the circumscribing cylinder. See torx_info() for allowed sizes.

Arguments:

By Position	What it does
size	Torx size.
l	Length of bit.
center	If true, centers mask vertically.

By Name	What it does
anchor	Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin	Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient	Vector to rotate top towards, after spin. See orient. Default: UP

Example 1:

include <BOSL2/std.scad>
include <BOSL2/screw_drive.scad>
torx_mask(size=30, l=10, $fa=1, $fs=1);

---

Module: torx_mask2d()

Synopsis: Creates the 2D cross section for a torx drive recess. ^[Geom]

Topics: Screws, Masks

See Also: phillips_mask(), hex_drive_mask(), torx_mask(), phillips_depth(), phillips_diam(), torx_info(), robertson_mask()

Usage:

• torx_mask2d(size);

Description:

Creates a torx bit 2D profile. The anchors are located on the circumscribing circle. See torx_info() for allowed sizes.

Arguments:

By Position	What it does
size	Torx size.

Example 1:

include <BOSL2/std.scad>
include <BOSL2/screw_drive.scad>
torx_mask2d(size=30, $fa=1, $fs=1);

---

Function: torx_info()

Synopsis: Returns the dimensions of a torx drive.

Topics: Screws, Masks

See Also: phillips_mask(), hex_drive_mask(), torx_mask(), phillips_depth(), phillips_diam()

Usage:

• info = torx_info(size);

Description:

Get the typical dimensional info for a given Torx size. Returns a list containing, in order:

• Outer Diameter
• Inner Diameter
• Drive Hole Depth
• External Tip Rounding Radius
• Inner Rounding Radius

Arguments:

By Position	What it does
size	Torx size.

---

Function: torx_diam()

Synopsis: Returns the diameter of a torx drive.

Topics: Screws, Masks

See Also: phillips_mask(), hex_drive_mask(), torx_mask(), phillips_depth(), phillips_diam(), torx_info()

Usage:

• diam = torx_diam(size);

Description:

Get the typical outer diameter of Torx profile.

Arguments:

By Position	What it does
size	Torx size.

---

Function: torx_depth()

Synopsis: Returns the typical depth of a torx drive recess.

Topics: Screws, Masks

See Also: phillips_mask(), hex_drive_mask(), torx_mask(), phillips_depth(), phillips_diam(), torx_info()

Usage:

• depth = torx_depth(size);

Description:

Gets typical drive hole depth.

Arguments:

By Position	What it does
size	Torx size.

---

Section: Robertson/Square Drives

Module: robertson_mask()

Synopsis: Creates a mask for a Robertson/Square drive recess. ^[Geom]

Topics: Screws, Masks

See Also: phillips_mask(), hex_drive_mask(), torx_mask(), phillips_depth(), phillips_diam(), torx_info()

Usage:

• robertson_mask(size, [extra], [ang], [$slop=]);

Description:

Creates a mask for creating a Robertson/Square drive recess given the drive size as an integer. The width of the recess will be oversized by 2 * $slop. Note that this model is based on an incomplete spec. https://www.aspenfasteners.com/content/pdf/square_drive_specification.pdf We determined the angle by doing print tests on a Prusa MK3S with $slop set to 0.05.

Arguments:

By Position	What it does
size	The size of the square drive, as an integer from 0 to 4.
extra	Extra length of drive mask to create.
ang	taper angle of each face. Default: 2.5

By Name	What it does
$slop	enlarge recess by this twice amount. Default: 0
anchor	Translate so anchor point is at origin (0,0,0). See anchor. Default: TOP
spin	Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient	Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

• Sets tag to "remove" if no tag is set.

Example 1:

include <BOSL2/std.scad>
include <BOSL2/screw_drive.scad>
robertson_mask(size=2);

Example 2:

include <BOSL2/std.scad>
include <BOSL2/screw_drive.scad>
difference() {
    cyl(d1=2, d2=8, h=4, anchor=TOP);
    robertson_mask(size=2);
}

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