Diamond D7 User Manual download pdf (Page 40)

General technical notes

Workpiece: Lens diameter 65 mm

R = 37.584 mm

Material SF57 and FK5

Machine: LOH LP75

Tool: d

= 8 mm

Specification: 1 = D15A / BZ488 / C35

2 = D15A / BZ5017 / C35

3 = D7 / BZ5017 / C35

4 = D7 / BZ5017 / C23

Parameter setting:

Head angle α = 7.5°

Oscillation angle β = +/- 5°

Workpiece speed

= 1000 rpm

Main grinding force F

= 140 N

Workpiece: Lens diameter 65 mm

R = 37.584 mm

Material LaFN21

Machine: LOH LP75

Werkzeug: d

= 8 mm

Specification: D15A / BZ488 / C35

D7 / BZ / C35

(soft bond)

Parameter setting:

Workpiece speed

= 1000 rpm

Head angle α = 12.5°

Oscillation angle β = +/- 5°

Main grinding force

= 140 N (D15A)

= 233 N (D7)

Fig. 2: Average peak-to-valley height R

is dependent on workpiece material and specification of pellet tool.

Pellet specification

Average peak-to-valley height R

[µm]

Test results for fine milling of optical glass with pellet

tools, acc. to IPT Fraunhofergesellschaft Aachen, Prof.

König

Fig. 3: The influence of the harder bond BZ488 and the coarser grit size D15A show benefits in material removal rate Q

and thus also in machining time t

. The softer bond with the finer grit size D7 gives benefits in surface finish and shape stability

∆ R:∆ V

, without regard to the considerably higher main grinding force F

, This advantage is at least 25%.

Material removal rate Q

[cm³/min] Average peak-to-valley

height R

[µm]

Machining time t

[min] Shape stability

∆ R:∆ V

[µm/cm

]

diamond tools

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Diamond D7 User Manual Page 40

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