Session 5 & 6 - Lathe
Safety
Always wear safety glasses.
Work piece must be clamped securely in a vice or to the mill table.
Make sure you are using the proper speeds and feeds for the material and cutter size.
Make sure you understand how to switch from high to low range and how to change the v belt on step pulleys.
Do not use dull or burned cutting tools.
Once tool is clamped into the collet remove drawbar wrench immediately. Do not leave wrench on drawbar nut.
Make sure spindle is running in the proper direction. Cutters are right hand. Spindle must rotate clockwise when viewed form the top of machine.
Make sure cutter is clear of part, vice, and your hands before starting spindle.
Always stay at the machine when it is running.
Make sure cutter is a safe distance away from part when using power feed.
Make sure machine has fully stopped before making any measurements, adjustments, or removing part. After spindle is turned off use the brake to stop the spindle.
When removing a tool from the spindle fold up a rag and put it on the table under the tool. Hold the brake and loosen the drawbar nut with the wrench 1/2 to 1 turn. Hold the tool with one hand and hit the nut with the brass part of the wrench.
13. Once machine is off and tool is removed clean machine with a brush, compressed air, then wipe off with a rag.
Videos: Straight Turning Work of Two Diameters and Drill, Boring, & Reaming Work Held in a Lathe Chuck
Parts of lathe-handout
Work holding
Chucks
3 jaw - limited holding power, not adjustable
4 jaw - irregular shaped parts, fully adjustable, slow to setup
6 jaw - good holding power, adjustable, fast
Mounting and removing chucks
Place a board under chuck when removing or mounting it.
Make sure chuck is tight on spindle before turning lathe on.
Disengage power feed when cutting close to chuck.
Collets - 1/64“ to 1 1/8”, run out of ~.001“
Faceplate
Turning between centers- use live center to support long work
Lathe cutting tools
HSS, carbide
Grinding proper clearances and rake- wood examples
Honing
Tool holders
Setting tool on center
Short extension for rigid setup
Operations
Facing
Center drilling/drilling/reaming/tapping (using Tail stock and center to guide tap)
Straight Turning
Taper Turning - angle compound
Boring
Knurling
Cutoff/parting
Single point threading - internal & external
Filing & polishing- file left handed to keep hand away from chuck jaws
Speeds and Feeds
Cutting speed formula
Finish Feed = .002“ advance per revolution
Roughing Feed = .008” advance per revolution
Changing feeds and speeds on various lathes