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Revar Desmera edited this page Mar 23, 2019 · 13 revisions

Library File threading.scad

Triangular and Trapezoidal-Threaded Screw Rods and Nuts. To use, add the following lines to the beginning of your file:

include <BOSL/constants.scad>
use <BOSL/threading.scad>

Table of Contents

  1. Generic Trapezoidal Threading

  2. Triangular Threading

  3. Metric Trapezoidal Threading

  4. ACME Trapezoidal Threading

  5. Square Threading

1. Generic Trapezoidal Threading

trapezoidal_threaded_rod()

Description: Constructs a generic trapezoidal threaded screw rod. This method makes much smoother threads than the naive linear_extrude method. For metric trapezoidal threads, use thread_angle=15 and thread_depth=pitch/2. For ACME threads, use thread_angle=14.5 and thread_depth=pitch/2. For square threads, use thread_angle=0 and thread_depth=pitch/2. For normal screw threads, use thread_angle=30 and thread_depth=pitch3sqrt(3)/8.

Argument What it does
d Outer diameter of threaded rod.
l Length of threaded rod.
pitch Length between threads.
thread_depth Depth of the threads. Default=pitch/2
thread_angle The pressure angle profile angle of the threads. Default = 14.5 degree ACME profile.
left_handed If true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: true
starts The number of lead starts. Default = 1
orient Orientation of the rod. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the rod. Use the V_ constants from constants.scad. Default: V_CENTER.
center If given, overrides align. A true value sets align=V_CENTER, false sets align=ALIGN_POS.

Example 1:

trapezoidal_threaded_rod(d=10, l=100, pitch=2, thread_angle=15, $fn=32);

trapezoidal_threaded_rod() Example 1

Example 2:

trapezoidal_threaded_rod(d=3/8*25.4, l=20, pitch=1/8*25.4, thread_angle=29, $fn=32);

trapezoidal_threaded_rod() Example 2

Example 3:

trapezoidal_threaded_rod(d=60, l=16, pitch=8, thread_depth=3, thread_angle=45, left_handed=true, $fa=2, $fs=2);

trapezoidal_threaded_rod() Example 3

Example 4:

trapezoidal_threaded_rod(d=60, l=16, pitch=8, thread_depth=3, thread_angle=45, left_handed=true, starts=4, $fa=2, $fs=2);

trapezoidal_threaded_rod() Example 4

Example 5:

trapezoidal_threaded_rod(d=16, l=40, pitch=2, thread_angle=30);

trapezoidal_threaded_rod() Example 5

Example 6:

trapezoidal_threaded_rod(d=10, l=40, pitch=3, thread_angle=15, left_handed=true, starts=3, $fn=36);

trapezoidal_threaded_rod() Example 6

Example 7:

trapezoidal_threaded_rod(d=25, l=100, pitch=10, thread_depth=8/3, thread_angle=50, starts=4, center=false, $fa=2, $fs=2);

trapezoidal_threaded_rod() Example 7

Example 8:

trapezoidal_threaded_rod(d=50, l=75, pitch=8, thread_angle=30, starts=3, bevel=true);

trapezoidal_threaded_rod() Example 8

Example 9:

trapezoidal_threaded_rod(l=25, d=10, pitch=2, thread_angle=15, starts=3, $fa=1, $fs=1, orient=ORIENT_X, align=ALIGN_POS);

trapezoidal_threaded_rod() Example 9

trapezoidal_threaded_nut()

Description: Constructs a hex nut for a threaded screw rod. This method makes much smoother threads than the naive linear_extrude method. For metric screw threads, use thread_angle=30 and leave out thread_depth argument. For SAE screw threads, use thread_angle=30 and leave out thread_depth argument. For metric trapezoidal threads, use thread_angle=15 and thread_depth=pitch/2. For ACME threads, use thread_angle=14.5 and thread_depth=pitch/2. For square threads, use thread_angle=0 and thread_depth=pitch/2.

Argument What it does
od diameter of the nut.
id diameter of threaded rod to screw onto.
h height/thickness of nut.
pitch Length between threads.
thread_depth Depth of the threads. Default=pitch/2.
thread_angle The pressure angle profile angle of the threads. Default = 14.5 degree ACME profile.
left_handed if true, create left-handed threads. Default = false
starts The number of lead starts. Default = 1
slop printer slop calibration to allow for tight fitting of parts. default=0.2
bevel if true, bevel the thread ends. Default: true
orient Orientation of the nut. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the nut. Use the V_ constants from constants.scad. Default: V_CENTER.

Example 1:

trapezoidal_threaded_nut(od=16, id=8, h=8, pitch=2, slop=0.2, align=V_UP);

trapezoidal_threaded_nut() Example 1

Example 2:

trapezoidal_threaded_nut(od=17.4, id=10, h=10, pitch=2, slop=0.2, left_handed=true);

trapezoidal_threaded_nut() Example 2

Example 3:

trapezoidal_threaded_nut(od=17.4, id=10, h=10, pitch=2, thread_angle=15, starts=3, $fa=1, $fs=1);

trapezoidal_threaded_nut() Example 3

2. Triangular Threading

threaded_rod()

Description: Constructs a standard metric or UTS threaded screw rod. This method makes much smoother threads than the naive linear_extrude method.

Argument What it does
d Outer diameter of threaded rod.
l length of threaded rod.
pitch Length between threads.
left_handed if true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: false
orient Orientation of the rod. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the rod. Use the V_ constants from constants.scad. Default: V_CENTER.

Example:

threaded_rod(d=10, l=30, pitch=1.25, left_handed=true, $fa=1, $fs=1);

threaded_rod() Example

threaded_nut()

Description: Constructs a hex nut for a metric or UTS threaded screw rod. This method makes much smoother threads than the naive linear_extrude method.

Argument What it does
od diameter of the nut.
id diameter of threaded rod to screw onto.
h height/thickness of nut.
pitch Length between threads.
left_handed if true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: false
slop printer slop calibration to allow for tight fitting of parts. default=0.2
orient Orientation of the nut. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the nut. Use the V_ constants from constants.scad. Default: V_CENTER.

Example:

threaded_nut(od=16, id=8, h=8, pitch=1.25, left_handed=true, slop=0.2, $fa=1, $fs=1);

threaded_nut() Example

3. Metric Trapezoidal Threading

metric_trapezoidal_threaded_rod()

Description: Constructs a metric trapezoidal threaded screw rod. This method makes much smoother threads than the naive linear_extrude method.

Argument What it does
d Outer diameter of threaded rod.
l length of threaded rod.
pitch Length between threads.
left_handed if true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: false
starts The number of lead starts. Default = 1
orient Orientation of the rod. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the rod. Use the V_ constants from constants.scad. Default: V_CENTER.

Example:

metric_trapezoidal_threaded_rod(d=10, l=30, pitch=2, left_handed=true, $fa=1, $fs=1);

metric_trapezoidal_threaded_rod() Example

metric_trapezoidal_threaded_nut()

Description: Constructs a hex nut for a metric trapezoidal threaded screw rod. This method makes much smoother threads than the naive linear_extrude method.

Argument What it does
od diameter of the nut.
id diameter of threaded rod to screw onto.
h height/thickness of nut.
pitch Length between threads.
left_handed if true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: false
starts The number of lead starts. Default = 1
slop printer slop calibration to allow for tight fitting of parts. default=0.2
orient Orientation of the nut. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the nut. Use the V_ constants from constants.scad. Default: V_CENTER.

Example:

metric_trapezoidal_threaded_nut(od=16, id=10, h=10, pitch=2, left_handed=true, bevel=true, $fa=1, $fs=1);

metric_trapezoidal_threaded_nut() Example

4. ACME Trapezoidal Threading

acme_threaded_rod()

Description: Constructs an ACME trapezoidal threaded screw rod. This method makes much smoother threads than the naive linear_extrude method.

Argument What it does
d Outer diameter of threaded rod.
l length of threaded rod.
pitch Length between threads.
thread_depth Depth of the threads. Default = pitch/2
thread_angle The pressure angle profile angle of the threads. Default = 14.5 degrees
starts The number of lead starts. Default = 1
left_handed if true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: false
orient Orientation of the rod. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the rod. Use the V_ constants from constants.scad. Default: V_CENTER.

Example 1:

acme_threaded_rod(d=3/8*25.4, l=20, pitch=1/8*25.4, $fn=32);

acme_threaded_rod() Example 1

Example 2:

acme_threaded_rod(d=10, l=40, pitch=2, starts=3, $fa=1, $fs=1);

acme_threaded_rod() Example 2

acme_threaded_nut()

Description: Constructs a hex nut for an ACME threaded screw rod. This method makes much smoother threads than the naive linear_extrude method.

Argument What it does
od diameter of the nut.
id diameter of threaded rod to screw onto.
h height/thickness of nut.
pitch Length between threads.
thread_depth Depth of the threads. Default=pitch/2
thread_angle The pressure angle profile angle of the threads. Default = 14.5 degree ACME profile.
left_handed if true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: false
slop printer slop calibration to allow for tight fitting of parts. default=0.2
orient Orientation of the nut. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the nut. Use the V_ constants from constants.scad. Default: V_CENTER.

Example 1:

acme_threaded_nut(od=16, id=3/8*25.4, h=8, pitch=1/8*25.4, slop=0.2);

acme_threaded_nut() Example 1

Example 2:

acme_threaded_nut(od=16, id=10, h=10, pitch=2, starts=3, slop=0.2, $fa=1, $fs=1);

acme_threaded_nut() Example 2

5. Square Threading

square_threaded_rod()

Description: Constructs a square profile threaded screw rod. This method makes much smoother threads than the naive linear_extrude method.

Argument What it does
d Outer diameter of threaded rod.
l length of threaded rod.
pitch Length between threads.
left_handed if true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: false
starts The number of lead starts. Default = 1
orient Orientation of the rod. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the rod. Use the V_ constants from constants.scad. Default: V_CENTER.

Example:

square_threaded_rod(d=10, l=30, pitch=2, starts=2, $fn=32);

square_threaded_rod() Example

square_threaded_nut()

Description: Constructs a hex nut for a square profile threaded screw rod. This method makes much smoother threads than the naive linear_extrude method.

Argument What it does
od diameter of the nut.
id diameter of threaded rod to screw onto.
h height/thickness of nut.
pitch Length between threads.
left_handed if true, create left-handed threads. Default = false
bevel if true, bevel the thread ends. Default: false
starts The number of lead starts. Default = 1
slop printer slop calibration to allow for tight fitting of parts. default=0.2
orient Orientation of the nut. Use the ORIENT_ constants from constants.scad. Default: ORIENT_Z.
align Alignment of the nut. Use the V_ constants from constants.scad. Default: V_CENTER.

Example:

square_threaded_nut(od=16, id=10, h=10, pitch=2, starts=2, slop=0.15, $fn=32);

square_threaded_nut() Example

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