Precision Layout and Drilling Exercise 01

Description:

This skills exercise is designed to properly Layout and Drill holes with equal spacing.

This Skills exercise also reinforces the use of Go-No Go gauges to improve quality and accuracy.

Hole positions are allowed ±0.030” tolerance. All holes drilled at 90°± 2° of surface of material.

Student Skills: I Can…

  1. practice drilling SOP from start up to clean up
  2. Read and Understand basic Drawings
  3. Use a Steel Rule to Accurately Layout hole locations
  4. Identify and implement best practices to Hole Layout and Drilling

Materials/Tools Required:

6”x6” square of ½ - ¾ MDF or .125” Aluminum Plate 2024 T3 / 6061 T6

Drill Motor: Electric or <3000 rpm Air Drill

0.125 Drill guide

0.250 Drill guide

0.125 Twist Drill

0.250 Twist Drill

BoeLube (If using aluminum)

Layout Tape (Wide Masking Tape)

Square

File and Deburring Tool

0.250 Pin Gauge

3+ Go/No-go gauge (Laser Cut)

Process Instructions:

Layout

Place Layout Tape on Part

Layout Holes as per Drawing Spec

Inspect marking to ensure conformity to drawing with Go/No-Go Gauge.

QA Tech Initials_____ Instructor initials_____

Drilling

Secure work pieces in a suitable vice or clamping device.

Caution: ensure the clamping device does not scratch or mark the surface of the part.

Using the proper drilling and guide tools, drill required holes at marked locations.

Pilot Holes with 0.125” Drill Bit

Full size Holes with 0.250” Drill Bit

Debur all holes at hole entry and exit

Use gauge pin to assess angular tolerance of hole

Mark Holes out of angular tolerance

Use Go/No-Go gauge to ensure dimensional standards and uniformity.

Mark Holes out of Placement tolerance

QA Tech Initials_____Instructor initials_____

Quality Control Assessment (Final inspection)

Perform a final quality control assessment by comparing the completed assembly against the standards and geometrydetailed in the drawing.

All work completed in accordance with the drawing and is ready for final inspection.

QA Technician Initials_____

Name:______

Drilling Quality Rubric
Description/ Points / 3 / 2 / 1 / 0
Hole Size and angle / Gauge Pin
(Correct Bit) / - / - / (Wrong angle)
Hole Position
(Go/No-Go) / <.030” / <.050” off / <0.100” off / >0.100” off
Hole Shape / Round on entry/exit hole / Not round on one entry/exit / Not round on both entry/exit / Not round in hole/entry/exit
Hole Inside (Bore) Appearance / Clean finish in 2/3 hole / Clean finish in 1/3 hole / Clean finish in < 1/3 hole / Rough Finish
Hole Burrs (Both Sides) / No burr, no visible countersink / Small burr or visible countersink / > 1 small burr and visible countersink / Burrs present front and back
Written Process Documentation / Labeled, easy to understand, readable / Missing one element / Missing two elements / Missing all elements or not done
Totals

Skills Self Reflection

What was difficult for you:

What went well:

What do I need to do to improve:

Snohomish County Advanced Manufacturing Project

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