08Lecture-G-Code-drill

# 08Lecture-G-Code-drill - ENGR3190U Manufacturing and...

• Notes
• 6

This preview shows pages 1–2. Sign up to view the full content.

ENGR3190U: Manufacturing and Production Processes Lecture 08 G-codes – Drilling There are various drilling operations in milling: G81 – Spot or chamfer drilling cycle, (also called basic drill cycle). Use for drilling not too thick stock. G73 – Chip break cycle (also called fast peck drill cycle). Used for drilling deep holes, breaks chip G83 – Deep hole drilling cycle. Used for drilling deep holes, rapids out to “R” value. This course will only cover G81. To drill a hole in a part, you have to (a) use a centre drill tool to pre-drill and mark the hole (b) change tool to drill bit and drill the hole 1. Feeds F and Speeds S For Drilling Feed rate for “drill like” operations (eg., drill, reaming, countersink) F = RPM x FEED PER REV FEED PER REV = numerical value from chart RPM = spindle speed = 4 x Cutting Speed / Diameter of tool RPM formula → Fatter drill slower RPM because tool will generate too much heat if RPM too fast F = RPM x PITCH (for tapping) where Pitch = 1/# of threads. Table of feed per revolution values Drill size (inch) Feed per rev 0.125 diameter or smaller 0.001 – 0.002 0.125 – 0.250 0.002 – 0.003 0.250 – 0.500 0.003 - 0.005 0.500 – 1.00 0.005 – 0.010 1.00 – 1.50 0.010 – 0.020

This preview has intentionally blurred sections. Sign up to view the full version.

This is the end of the preview. Sign up to access the rest of the document.
• Spring '10
• yang
• High speed steel, Cutting fluid, Surface feet per minute, 08 G

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern