Hypertherm LH2100 - Manual (Page 38)

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OPERATION
LH2125/LH2100 Laser Head Instruction Manual 4-11
Focal position locations
Effective focal lengths listed in the table are for Hypertherm lenses only. The formulas in the table will help determine the
focal position for each lens and lens-bay if Hypertherm lenses are not being used.
Definitions
Lens bay location (LBL) = Location of the lens bay relative to the nozzle exit
Edge thickness (ET) =
Back focal length (BFL) = The distance from the lower edge of the lens to the focal point
Lens position (LP) = The number read off the indicator on the laser head
Effective focal
length
(Hypertherm
lenses)
Lens bay location
(LBL)
relative to nozzle
Edge
thickness
(ET)
Back focal
length
(BFL)
Lens
position
(LP)
read by
indicator
Formula
LBL-ET-BFL-LP=FP
Focal
position
(FP)
relative to
nozzle
7.5"
P/N 021006
206.7 mm
(8.14")
7.9 mm
(0.31")
185.3 mm
(7.30")
7.0 mm
(0.28")
206.7 - 7.9 - 185.3 - 7.0 = 6.5 mm
8.14 - 0.31 - 7.3 - 0.28 = 0.25 in
6.5 mm
(0.21")
10.0"
P/N 021007
270.4 mm
(10.65")
7.9 mm
(0.31")
252.5 mm
(9.94")
7.0 mm
(0.28")
270.4 - 7.9 - 252.5 - 7.0 = 3.0 mm
10.65 - 0.31 - 9.94 - 0.28 = 0.12 in
3.0 mm
(0.46")
12.5"
P/N 021008
336.5 mm
(13.25")
7.9 mm
(0.31")
314.7 mm
(12.39")
7.0 mm
(0.28")
336.5 - 7.9 - 314.7 - 7.0 = 6.9 mm
13.25 - 0.31 - 12.39 - 0.28 = 0.27 in
6.9 mm
(0.31")
Beam
BFL
Hypertherm lenses are rated for 20.7 bar (300 psi)