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Q&As since 1989


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Surface smoothness/finishing of Zinc Diecast products

Dear Friends,

We are a Zinc Diecasting company which use standard Zamak 3 alloy. We wish to electroplate our products with Chromium & brass plating & before plating wish to make the surface of product very smooth & scratchless WITH OUT USING ANY MANUAL PROCESS. Please advice that how the surface can be smooth w/o including any manual process.

Best regards,

Asheesh Jindal
- India
2003

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It is possible to vibratory finish small parts or drag finish large parts.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

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Dear Mr. Ted Mooney,

Thanks for your reply. Please advice me about Drag Finish ... Procedure, machines, chemicals ?

Best regards,

Asheesh
- India
2003

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Drag finishing uses similar parts and solutions to what is used for vibratory finishing--it's just used for bigger, individual parts.

Each part is racked individually, hanging down from a spindle and into the container of media. A chain or similar power transmission device drags the spindles and the parts around and around through a race track style loop. At the same time that the part is being dragged around this orbit it is also rotating around the spindle. Sort of similar to the way the earth revolves around the sun but also rotates around its axis. By adjusting the orbital speed and the rotational speed (as well as the media), different finishes can be obtained.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003