# MPCNC Size Calculator¶

## Sizing¶

When choosing what size to make your machine, start with the *build area*. This is the area your
tool can reach. Smaller machines are more rigid. The more rigid a machine is, the easier and more
forgiving it is to use. This gives you a larger acceptable feeds and speeds window. More rigid
also means it will be faster and more accurate with the right settings. Every millimeter counts but
**the Z axis has the largest effect on rigidity**. For a Primo MPCNC, 81mm is the shortest and **I
highly** recommend that. More sizing details on this page.

## Inputs¶

#### Units¶

Metric (mm)

Imperial (inch)

#### Model¶

Primo

Burly

#### Tool Choice *¶

Full range of motion (pen, laser, drag knife, Makita RT70x, etc)

Dewalt DW660

52mm & 55mm Spindle

* Tool Choice

Larger tools may collide with the side rails and restrict movement before the MPCNC reaches its full range of motion in X and Y. Select your intended tool to account for this difference in the following dimensions:

## Size Calculator¶

#### Workspace¶

mm x

mm y

mm z

#### Tube Lengths¶

Length (mm) | Qty | Name |
---|---|---|

2 | x rails, sides | |

1 | x rail, gantry | |

2 | y rails, sides | |

1 | y rail, gantry | |

2 | z rails | |

4 | legs | |

total needed |
total tube length assuming 3mm kerf |

#### Material Dimensions¶

Length (mm) | Qty | Name |
---|---|---|

1 | leadscrew length | |

2 | belt length along x | |

2 | belt length along y | |

total length |
belts (all 4) |

#### Table Size¶

Length (mm) | Name |
---|---|

x table size (outer edges of feet) | |

y table size (outer edges of feet) |

#### Total Machine Footprint¶

Length (mm) | Name |
---|---|

x | |

y | |

z | |

clearance to remove z axis |