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Doing Vertical Milling

Doing Vertical Milling. Select stock material, dimension Select workholding usually vice or strap clamps Select tools & create toolpath FeatureCAM or Pro/E for CNC, by hand for manual Set work and tool offsets (for CNC) Determine feeds, speeds, and cutting depth

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Doing Vertical Milling

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  1. Doing Vertical Milling • Select stock • material, dimension • Select workholding • usually vice or strap clamps • Select tools & create toolpath • FeatureCAM or Pro/E for CNC, by hand for manual • Set work and tool offsets (for CNC) • Determine feeds, speeds, and cutting depth • FeatureCAM helps with this for CNC

  2. Vertical Milling

  3. Coordinate System

  4. Work Offsets • Work Offsets • G54-G59 • G54 X & Y aligned with vice step jaw left front • Set G54 Z to height of top of work (type number, press F1)

  5. Offsets

  6. Setting Work Offset

  7. Tool Offsets • Select tool # • Jog until touch • Press “Tool Offset Measure” • Subtract 2.000” (-2.0 Enter)

  8. Process • Rigidity: • use shortest tool and tool holder • deflection of tool or work causes form error • keep workpiece firmly clamped and supported • avoid speed/feed/depth combos that chatter • Heat: • use coated tools when heat is a problem • keep chips cleared (liquid or air coolant) • hard chips get harder • soft chips stick to tool • don’t go too fast OR too slow • Chip load: • keep volume removed constant! • especially watch tool entry, exit, corners

  9. Setting Feeds & Speeds • http://www.custompartnet.com/calculator/milling-speed-and-feed

  10. Vibration (chatter)

  11. Vibration

  12. Vibration • For Max Material Removal Rate: • Choose highest spindle RPM • Tune tool length to stay in a stable lobe at top spindle RPM

  13. Vibration

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