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Unexpected Etching Staining on New Sub Plate

mdn124

Plastic
Joined
May 10, 2018
Hello,

I'm having an issue with my new Haas Mini Mill. I installed a brand new Chick Workholding sub plate on my table. I removed the first mounted 6061 aluminum fixture after several weeks and noticed discoloration/etching on the sub plate. The fixture bottom is still clean. I mounted two Chick vises to the sub plate and after several days have discoloration/etching on the sub plate. The bottoms of the vises are still clean. The worst of the etching has occurred below the OTS Haas tool height setter, which was mounted in its location less time than the vises. The bottom of the OTS base is spotless. I'm using Hangsterfer's S-388 coolant at nearly 10% mix and reverse osmosis deionized water.

Hangsterfer's says to run a ground to a ground rod buried 3ft in the earth.

Haas says DO NOT use a ground rod, but ground the machine to the building ground (which it is).

This may be an electrolysis issue? Anyone have experience with this sort of problem? Pics attached. Thanks!
Vise Stain.jpgIMG_1078.jpg
 








 
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