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Drilling PCB’s

I can only say one thing in regard to drilling PCBs by hand, why are you using a jobber drill? What is a jobber drill? A jobber drill is meant for drilling deep holes and thus have a lot of flute length.

Center Drill Dimesions

So, let me introduce you to something known as a Center Drill. These guys are designed to be rigid and not walk which is a perfect application for drilling PCBs. Essentially you will drill a starter hole and then switch bits to the jobber drill. Most of you will probably be using a #0 or #1 Center Drill. A typical resistor lead is roughly 1/32 in diameter so a #0 should work just fine. Ultimately you should have less broken drills and your production time should be cut enough though you will switching tools. These are fine to use in a drill press for drilling PCBs, they will not walk.  

Size

Body Dia (A)

Drill Dia (D)

Drill Length (C)

OAL (L)

00

1/8

0.025

0.030

1 1/8

0

1/8

1/32

0.038

1 1/8

1

1/8

3/64

3/64

1 1/4

2

3/16

5/64

5/64

1 7/8

3

1/4

7/64

7/64

2

4

5/16

1/8

1/8

2 1/8

5

7/16

3/16

3/16

2 3/4

6

1/2

7/32

7/32

3

7

5/8

1/4

1/4

3 1/4

8

3/4

5/16

5/16

3 1/2

 

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