It's imperative that design engineers understand the full journey of the parts they design, from the drawing definition, through manufacturing, and inspection. One of the most common features in machine design is a hole. Whether it accepts a bolt or holds a precision bearing, it has to be the right size and in the right location for the machine to function properly. In this video, we'll outline the considerations for designing holes and precision bores, give you some tips for machining them reliably and cost-effectively, and compare the different ways they may be inspected.

00:00 - Introduction
00:47 - Precision Bores in Machine Design
02:36 - Limits of Size of Holes
03:03 - GD&T Location Controls
03:55 - GD&T Form Controls
04:43 - GD&T Orientation Controls
05:31 - Surface Finish
06:26 - Drilled Holes
07:33 - Tips for Using Drills
08:23 - Spot Drills
09:44 - Reamers
11:26 - Boring
12:27 - Circular Milling
13:07 - In-Control Compensation (G41/G42)
14:28 - Accuracy of Machining Processes
16:21 - Inspection of Precision Holes
17:03 - Plug Gauges (Go/No-Go Pins)
17:54 - Calipers for ID Measurements
18:26 - Telescoping Bore Gauges
19:00 - Tubular ID Micrometer
19:36 - Dial Bore Gauge
20:19 - Tri-Point Micrometer
21:45 - How to Confirm a Bore is In-Spec
23:10 - Rule 1, The Envelope Principle
24:01 - ISO vs. ASME for Features of Size
25:31 - Conclusion

Tarkka Shop: https://www.etsy.com/shop/tarkkadesign/

Companion Blog Post: https://tarkka.co/2021/02/07/holier-t...


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