Lathe operation

The Monmouth College Physics machine shop (1XX) has the Grizzly G0768 - 8" x 16" Variable-Speed Lathe.

Specs

The following is an excerpt from the Grizzly webpage:

This 8" x 16" Variable-Speed Lathe is perfect for a sturdy workbench or as a stand-alone unit when mounted on the T26599 Optional Stand [which MC has]. Features variable-speed spindle with high/low speed ranges, convenient quick-lock tailstock, reverse feed for cutting left-hand threads, and a great selection of included standard equipment.

Specifications:

Swing over: bed 8-1/4", cross slide 4-5/8"

Distance between centers: 15-3/4"

Spindle: bore 0.787" (20mm), taper MT#3

Motor: 600W (3/4 HP), 110V, DC, 10A

Spindle speed ranges: Low 50–1000, High 100–2000 RPM

Travel: compound rest 2-1/8", cross slide 3"

Tailstock: quill travel 2", taper MT#2

Feed speeds: (3) 0.0037"–0.0071"/rev

Inch threads: (15) 9–44 TPI

Metric threads: (12) 0.4–3.0mm

Footprint: 31-1/2" x 10-1/2"

Overall size: 36" W x 16" D x 14" H

Approx. shipping weight: 166 lbs.

Standard Equipment:

4" 3-Jaw and 4-jaw chucks

6-3/4" Faceplate

Steady rest & follow rest

4-Way turret tool post (3/8" max tool size)

MT#2 & MT#3 dead centers

Instructional Videos

General website

Simple lathe operations on the 7x10 mini-lathe

"face-off" using a carbide tipped tool.

"file" while turning to finishing an edge.

"center-drilling" with end-mill attachment.

"center-drilling with a drill chuck" using a stubby drill bit.

"parting" with a parting tool.

How to Select the Proper Cutting Tool for Lathe Operations - Basic Tutorial

Cutting Speed and RPM on the Lathe and Mill

Mild Steel-1018 100 SFPM (surface feet per minute)

Tool Steel-oil harened (harder than mild steel), 70 SFPM

Cast iron, 60 S

Stainless steel (304), ? SFPM

Stainless steel (318), ? SFPM

Aluminum (soft metal), 250 SFPM

Brass (soft metal), 300 SFPM

Take home info

the harder the metal, the lower the RPMs

conversion of SFPM to tool RPM --> 4 x cutting speed in SFPS /tool diameter

mill/drill example; mild steel using a 5/8" tool --> 4 x 100 SFPM/0.625" = 640 RPM

lathe example, using a

drill example

Materials

Plastics

Delrin