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04 Broach EDM

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Select an EDM tool for very hard materials (40Hrc and above). EDM machine will be set per tool;
RFOPB5000ED3 – to produce a burn which is .002” to .003” larger than the “A” diameter.
Material: Copper Tungsten, with option of alloy steel shank.

RFOPB5002ED2 – to produce a burn which is .009” to .011” larger than the “A” diameter.
Material: Union Poco Grade EDM-3 Graphite, with option of alloy steel shank.

This will allow the lockring to fit into the serration produced with about .004 to .005 clearance. In both cases the serrations should be gauged with the “Port Serration Gauge” or with the applicable lockring.
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