Eccosorb®MF500F

2

RFP-DS-MF500F 092115

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end user. Laird Technologies makes no warranties as to the fitness, merchantability, suitability or non- infringement of any Laird Technologies materials or products for any specific or general uses. Laird Technologies shall not be liable for incidental or

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MACHINING RECOMMENDATIONS

Most of the discussion below applies not only to the basic Eccosorb MF500F series of materials, but also to several high temperatures, castable and

molding-powder equivalents. Eccosorb MF500F can be formed readily to close tolerances with standard metal-working machine tools, i.e.: lathes,

milling machines, drills, saws, grinders, generally using conventional techniques but observing the precautions and limitations described below.

Tooling :

•

For turning, milling, drilling and tapping, carbide tools should be used, for example Type 883, a general purpose carbide that works well

under most conditions. Use solid carbide taps for long life. Standard size tap drills should be satisfactory.

•

External threads are formed best, not with conventional thread-cutting dies but by lathe turning or grinding, with light feeds and shallow

cuts.

•

Sawing can be done with best finish and tolerance using circular saws, 20.3 to 25.4 cm diameter, with grinding coolant and high RPM.

Thin carborandum wheels, 0,079 cm thick or carbide saws may be used where requirements are less stringent. Best results are attained

by moving the saw and keeping work stationary, with saw rotating so it tends to climb into the work.

•

Surface finishing of flat sheets, etc. is best performed with a Blanchard grinder. Eccosorb MF is held readily with magnetic chucks. Sheet

size is limited by the size of the machine.

Coolants :

•

Use of a coolant liquid is recommended, especially for all close tolerance operations. Commercial grinding fluid is preferred, or water-

soluble oil, with rust-resisting properties to protect the machines. Spark producing operations in particular must not be run dry, since

smoldering fires might result.

•

Where coolant run-off is collected for recirculation, a two-cavity recovery system should be used to minimize pick-up of grinding dust,

sawdust or chips by the coolant pump. Where a re-circulating system is not available, best results will be obtained with air-powered

spray or mist equipment.

Use of tapped metal inserts should be considered where electrical performance will not be degraded. Inserts may be cast in place, or bonded with

castable material of suitable composition.

Suggested Speeds and Feed Rates

The following speeds and feed rates are suggested to be modified as necessary to suit job conditions:

OPERATION

SPEED

FEED

Sawing, turning

21.3 - 27.4 m/min

(70-90 ft/min)

0.13 - 0.20 mm/revolution

(.005-.008 in/revolution)

External threading

21.3 - 27.4 m/min

(70-90 ft/min)

0.038 mm/pass

(.001 in/pass)

Tapping

450 rpm

Tapping Head

Milling

21.3 - 27.4 m/min.

(70-90 ft/min)

0.038 - 0.076 mm/tooth

(.0015-.003 in/tooth)