Vertical Milling Doing Vertical Milling Select stock material
- Slides: 18
Vertical Milling
Doing Vertical Milling • Select stock – material, dimension • Select workholding – usually vise or strap clamps • Select tools & create toolpath – Esprit, Inventor HSM, Creo or hand-edited G-code for CNC, by hand for manual – Mfg. Suite does accurate simulation of G-code. • Set work and tool offsets (for CNC) • Determine feeds, speeds, and cutting depth – Esprit and Inventor HSM help with this for CNC
Coordinate System
Example Program % (DRILL 6. 35 MM HOLES) O 0010 (SIMPLE EXAMPLE FOR NVX) (OP 1 - TOP SIDE) G 28 Z 0 (STOCK- 50 MM X 40 MM X 50 MM) T 9 M 6 (G 54 ZERO- LEFT FRONT TOP) G 43 H 9 G 54 S 2000 M 3 G 00 G 40 G 90 G 17 G 21 M 8 (SPOT DRILL HOLES) G 0 X 12. 5 Y 12. 5 Z 2. 5 T 7 M 6 G 83 Z-2. 5 Q 2. 5 R 2. 5 F 250. 0; (CANNED DRILL CYCLE) G 43 H 7 X 12. 5 Y 25. 0 S 2000 M 3 X 25. 0 Y 25. 0 M 8 X 25. 0 Y 12. 5 G 0 X 12. 5 Y 12. 5 Z 2. 5 G 81 Z-2. 5 R 2. 5 F 250. 0; (CANNED DRILL CYCLE) G 80 G 0 Z 2. 5; X 12. 5 Y 25. 0 X 25. 0 Y 25. 0 M 9 X 25. 0 Y 12. 5 M 5 G 80 G 0 Z 2. 5; (CANCEL CANNED CYCLE) M 9 G 28 Z 0 M 5 M 30 % (CANCEL CANNED CYCLE)
G-Codes for Milling G 00 Rapid positioning G 01 Linear interpolation (feeding) G 02 CW Circular interpolation G 03 CCW Circular interpolation G 04 Dwell G 20 Inch system G 21 Metric system G 30 Return to reference point G 43 Tool Length Compensation
G-Codes for Milling G 54 -G 59 Select work coord system G 65 Macro call G 81 Drill canned cycle G 83 Peck drill canned cycle G 84 Tapping canned cycle G 90 Absolute coordinates G 91 Incremental coordinates
M-Codes for Milling M 0 Program Stop M 1 Opt. Program Stop (panel controlled) M 3 Start spindle (normal rotation) M 4 Start spindle (reverse rotation) M 5 Stop spindle M 6 Tool change M 8 Start coolant M 9 Stop coolant M 30 Program end
Work Offsets • G 54 -G 59 • Different offsets will be identified for different vise jaw corners. • If Z 0 is top of stock, measure from table and subtract 600. 0 mm. • Work probe should be available soon.
Offsets
Setting Work Offset
Tool Offsets • Enter tool data in offset table • Put tool in spindle • Indicate tool number in TOOL REGISTRATION screen
Tool Offsets • Run program O 0002, move tool close to sensor, press START again.
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 carbide 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
Setting Feeds & Speeds • http: //www. custompartnet. com/calculato r/milling-speed-and-feed
Chip Formation https: //www. youtube. com/watch? v=m. Ru. SYQ 5 Np ek
Vibration
Vibration • For Max Material Removal Rate: – Choose highest spindle RPM – Tune tool length to stay in a stable lobe at top spindle RPM
Vibration
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