Screws

Screws and screw bores. More...

Collaboration diagram for Screws:

Files
file	screws.scad
	Screws and screw bores.

Functions
module	screw_bore (d=1, l=1, h, n, t, s, f=1, a=0)
	Flat and beveled-head screw bore with nut, nut slot, and bore tolerance. More...

Detailed Description

Screws and screw bores.

Requires:
include <omdl-base.scad>;
include <models/3d/fastener/screws.scad>;

Function Documentation

screw_bore()

module screw_bore	(	d	= 1,
		l	= 1,
		h	,
		n	,
		t	,
		s	,
		f	= 1,
		a	= 0
	)

Flat and beveled-head screw bore with nut, nut slot, and bore tolerance.

Parameters

d	<decimal> bore diameter.
l	<decimal> bore length.
h	<decimal-list-5> screw head; a list [hs, hf, hb, hg, hr], the head size, flat-height, bevel-height, side geometry (flat side count), and rotation. The head size is measured flat-to-flat when hg is specified.
n	<decimal-list-5> screw nut; a list [ns, nf, nb, ng, nr, no], the nut size, flat-height, bevel-height, side geometry (flat side count), rotation, and bottom offset. The nut size is measured flat-to-flat.
t	<decimal-list-2> bore tolerance; a list [tx, ty], the tolerance along the x and/or y axis.
s	<decimal-list-list-3> nut slot cutout; a list of lists [sx, sy, sz], the list of slot sizes along the x, y, and/or z axis. Each of sx, sy, or sz can be a decimal list, such as [lower, upper], or a single decimal value, to cover [0, value].
f	<decimal-list-2 | decimal> bore scale factor; a list [bf, hf], the bore diameter and bore height scale factors, or a single decimal to specify bf only. The default value for hf = 1 and it scales only the screw head and nut heights.
a	<integer> z-alignment index; one of eight preset alignments.

Construct a bore for a screw hole, screw head, and/or screw nut. Both the screw head and screw nut are optional. A tolerance can be specified along the bore x and y axis. A nut slot cutout can be specified along the x, y, or z axis. The following example uses both tolerance and a nut slot along the y axis. For convenience, exact fastener dimensions can be specified along with the an appropriately selected scale factor f to slightly increase the bore for acceptable fastener fit.

Screw bore example script

    include <omdl-base.scad>;
    include <models/3d/fastener/screws.scad>;
 
    $fn = 36;
 
    // screw bore with tolerance and nut-slot from front to back
    %difference()
    {
      cube([10, 15, 18], center=true);
      screw_bore(2.75, 18+eps*8, h=[6,1,3], n=[6,2,0,6,30,3], t=[0,5], s=[0,[-6,6],0], f=1.15);
    }
 
    // show actual minimal space required
    screw_bore(2.75, 18, h=[6,1,3], n=[6,2,0,6,30,3]);
 
    // end_include

Screw bore example diagram

top	front	diag

Definition at line 358 of file screws.scad.

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