finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsBooksHelpWantedAdvertiseForum
topic 255

Electroforming of hollow tapered tubing


(1996)

I am working on a project which attempts to electroform hollow tapered tubing of various cross sections. The tapering tubes range square sections from approx. 8 mm square to 5 mm diameters. I am hoping to use female mandrels which will allow me to grow from the "outside-in", as I care about the surface quality on the outside, and not the inside...I am planning to use a long thin depleting silver anode running thru the center of the tubes...if I am hoping to grow 120-140 microns of silver walls for the tubes, am I going to have problems with anode/cathode proximity being so close?, Of course, presuming that I monitor the growth somehow so that I don't get a short. Also, are there silver baths other than cyanide? that are as efficient ? thanks for any information/help/pointers that anyone can give.

--RICHARD at the SAINTS

Richard Chan
- San Francisco, California

You may be doing the project the hard way! I think you can get a bright , smooth , finish on the outside with an internal mandrel at these thicknesses, as long as you're not trying for an absolutely perfect outside surface. There is a world of difference between the worst electroforms you've seen and what is achievable.

If you do use an internal anode, it seems that a stainless steel one might be a much easier way to go. I don't think there is any reason to worry about close anode-cathode spacing except for short circuits.

Non-cyanide silver plating solutions aren't used for decorative plating yet because the color is a bit off, but they may be okay for functional plating. I'm not sure about the heavier plating for electroforms, but contact EPI (Electrochemical Products Inc.) [a finishing.com supporting advertiser] and Zinex and see what they say. Good luck.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.