Specialty Components | Knowles Precision Devices

Design Guidelines: Laser Machining

Property	Value and Tolerances	Comments
Maximum Thickness	.060"	Thicker materials require factory consultation
	.003"	CO2 beam width = .003", use .006" min radius to change cut direction
Smallest Feature	0.6:1(ratio) minimim diameter to material thickness
Front to Back Taper	10 - 15% of material thickness	Includes bell effect at entrance
Via Hole for plated thru connection	0.8:1 (ratio) hole diameter to material thickness	Measured at exit, account for metal anulas on circuit side
Via Hole filled	0.7:1 (ratio) hole diameter to material thickness	Account for metal anulas on circuit side
Feature Size Tolerance	± .002"	Non-Commulative
	1X material thickness	Not less than .020"
	1X material thickness	Not less than .020"
	± .003"	All cutouts require a .003" pullback of backside metal.
Diamond Sawing	± .001" min	± .002" Standard

Nominal Substrate Thickness		Resultant Segment Tolerance From Two Broken Edges		Laser Scribed Edge of Board To First Scribe Line
(English)	(Metric)	(English)	(Metric)	(English)	(Metric)
0.010"	0.254 mm	+0.006" -0.002"	+0.15 mm -0.05 mm	+0.004" -0.002"	+0.10 mm -0.05 mm
0.015"	0.381 mm	+0.006" -0.002"	+0.15 mm -0.05 mm	+0.004" -0.002"	+0.10 mm -0.05 mm
0.020"	0.508 mm	+0.006" -0.002"	+0.15 mm -0.05 mm	+0.005" -0.002"	+0.13 mm -0.05 mm
0.025"	0.635 mm	+0.006" -0.002"	+0.15 mm -0.05 mm	+0.005" -0.002"	+0.13 mm -0.05 mm
0.030"	0.762 mm	+0.008" -0.002"	+0.20 mm -0.05 mm	+0.006" -0.002"	+0.18 mm -0.05 mm
0.035"	0.889 mm	+0.008" -0.002"	+0.20 mm -0.05 mm	+0.007" -0.002"	+0.18 mm -0.05 mm
0.040"	1.02 mm	+0.008" -0.002"	+0.20 mm -0.05 mm	+0.007" -0.002"	+0.18 mm -0.05 mm
0.050"	1.27 mm	+0.008" -0.002"	+0.20 mm -0.05 mm	+0.007" -0.002"	+0.18 mm -0.05 mm
0.060"	1.52 mm	+0.014" -0.002"	+0.36 mm -0.05 mm	+0.010" -0.002"	+0.25 mm -0.05 mm
0.080"	2.03 mm	+0.020" -0.004"	+0.51mm -0.10 mm	+0.012" -0.003"	+0.30 mm -0.08 mm
0.100"	2.54 mm	+0.025" -0.004"	+0.64mm -0.10 mm	+0.014" -0.003"	+0.36 mm -0.08 mm
0.120"	3.05 mm	+0.025" -0.004"	+0.64mm -0.10 mm	+0.014" -0.003"	+0.36 mm -0.08 mm
Notes: 1. Laser machined edges to first scribe line tolerance is ± 0.002" (± 0.051 mm) for all substrate thicknesses prior to breaking. 2. Scribe line to scribe line tolerance prior to breaking is ± 0.002" (± 0.051 mm).