catchnhole

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An ergonomic way to create nutcatches, screw holes and countersinks in OpenSCAD.

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# catchnhole
Because `nutsnbolts` was taken.

An ergonomic way to create nutcatches, screw holes and countersinks in OpenSCAD.

![Nutcatches, screw holes and countersinks](https://raw.githubusercontent.com/mmalecki/catchnhole/latest/examples/simple.png).

## Requirements and installation
**`catchnhole` uses OpenSCAD's JSON `import`, which is only present in the [nightly
build](https://github.com/openscad/openscad#building-openscad), and must be
enabled** (`Edit` -> `Preferences` -> `Features` -> `import-function`).

Add a git submodule to your project:

```sh
git submodule add https://github.com/mmalecki/catchnhole catchnhole
```

## Usage
```openscad
use <catchnhole/catchnhole.scad>;

difference () {
  translate([-5, -5, 0]) cube([10, 10, 10]);

// Draw a nutcatch parallel to bolt shaft:
  nutcatch_parallel("M3");
  // Draw a bolt gripping the nutcatch:
  bolt("M3", length = 10);

// Or, draw a nutcatch sidecut into the part:
  translate([0, 0, 4]) {
    nutcatch_sidecut("M3");
    // Draw a bolt gripping the nutcatch:
    bolt("M3", length = 6);
  }
}
```
For more advanced usage, see the [`examples` directory](./examples).

### API

#### `bolt(name, length, kind = "headless", head_diameter_clearance = 0.1, countersink = 0)`
Draw a bolt up the Z axis, with head at the top.

Arguments:
  * `name` (string) - name of the bolt, e.g. `"M3"`
  * `length` (number) - length of the bolt
  * `kind` (string) - the kind of the bolt, available values:
    * `"headless"` - no bolt head
    * `"socket_head"` - socket head cap (ISO 4762)
    * `"countersunk"` - countersunk head (ISO 10642, DIN 7991)
    * `"hex_head"` - hex head (ISO 4014)
  * `head_diameter_clearance` - how much side clearance to leave for the bolt head, where applicable
  * `head_top_clearance` - how much top clearance to leave for the bolt head, where applicable
  * `length_clearance` - how much clearance to leave for the bolt past `length` (down the Z axis; useful if your origin point is a nut and your `length` is calculated, or just want to allow for longer bolts)
  * `countersink` (number) - how much to "countersink" the bolt - move it down by the `countersink` * bolt head length

#### `bolt_head(name, kind, head_diameter_clearance = 0.1)`
Draw a bolt head up the Z axis.

Arguments:
  * `name` (string) - name of the bolt, e.g. `"M3"`
  * `kind` (string) - the kind of the bolt, available values:
    * `"socket_head"` - socket head cap (ISO 4762)
    * `"countersunk"` - countersunk head (ISO 10642)
    * `"hex_head"` - hex head (ISO 4014)
  * `head_diameter_clearance` - how much side clearance to leave for the bolt head, where applicable
  * `head_top_clearance` - how much top clearance to leave for the bolt head, where applicable

#### `nutcatch_parallel(name, height_clearance = 0, width_clearance = 0)`
Draw a nutcatch parallel to the bolt axis.

Arguments:
  * `name` (string) - name of the nut, e.g. `"M3"`
  * `kind` (string) - the kind of the nut, available values:
    * `"hexagon"` - hexagon (ISO 4032)
    * `"hexagon_thin"` - thin hexagon (ISO 4035)
    * `"hexagon_lock"` - hexagon locknut (ISO 7040)
  * `height_clearance` (number) - additional nut height clearance
  * `width_clearance` (number) - additional nut width clearance

#### `nutcatch_sidecut(name, height_clearance = 0, width_clearance = 0)`
Draw a nutcatch sidecut into the part:

Arguments:
  * `name` (string) - name of the nut, e.g. `"M3"`
  * `kind` (string) - the kind of the nut, as noted in `nutcatch_parallel`
  * `height_clearance` (number) - additional nut height clearance
  * `width_clearance` (number) - additional nut width clearance

## Acknowledgements
* The [authors](https://github.com/boltsparts/boltsparts/graphs/contributors) of the [BOLTS](https://github.com/boltsparts/boltsparts) library

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