8. Computer controlled machining¶

This week I worked on defining my final project idea and started to getting used to the documentation process.

Group assignment¶

Safety¶

Listen to the sound from the machine Always wear glasses, shoes, fitting clothes and gloves Ensure cut pieces do not block path of mill.

Different Mills¶

Down cuts, centre cuts, up cuts shallow cuts with down cut deep cuts with up cuts hybrid mills upcut with HDPE is beautiful unlike wood Flat vs ball end mill bits Ball end for smoother finishes in in curved projects Flat end gives more accurate cuts in flat surface with 3 axis movement and to remove debris

Kerf offset¶

Tool diameter is not = to kerf. There is a runout. Climb vs conventional machining Trochoidal milling

Different materials¶

MDF & its expensive cousin- Valchromat OSB- oriented strand board- to look into HDPE- Cuts well and flexes well Garolite- PCB material safe material to work with carbon fiber Aluminium composite panel

Speeds & Feeds¶

Listen to the sound of the machine Chip load: amount of wood each spin take out: between one and ten thousands of an inch Work depth should ideally be= Diameter of tool Stepover= half or more of tool diameter for cleaner cuts