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Photo Etching

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Formed Photo Etched Parts Design Guide

Forming and Special Processes for Manufacturing Precision Parts
Tech-Etch manufactures formed parts by combining photo etching or photo chemical milling, used for blanking, with inexpensive or universal tooling, used for forming. This method produces burr-free parts in intricate and complex designs and shapes. It also makes it possible to prove your design in preproduction quantities without having to commit to expensive, progressive die tooling. The following guidelines represent practical methods to assure proper function and the best cost.

  • Prove your design in preproduction quantities.
  • Burr-free parts in intricate and complex shapes.
  • 1/2-depth etching for hand forming on applications like board level shielding.
  • Heat treatment for enhanced spring qualities.
Precision Formed Parts

For a quotation, please send a sketch, formal drawing or cad file of your part and the approximate quantity required. You can also use our form to contact us.

HAND FORMING
For bends that do not require structural strength and where a sharp internal radius is desired, such as board-level shielding applications, depth etched bend lines may be used for hand forming. The lines are produced by etching a groove along the bend line of the part. By eliminating the need for forming tools, the cost is lowered.
Depth Etch Bend Lines

BEND RADII
In the forming process, care is taken to design the proper bend radii, since larger radii can withstand a larger deflection without failure. Example B is designed to take a larger deflection than Example A.
Bend Radii

TOLERANCES
Preferred forming tolerances are as shown.
(Consult factory if tighter tolerances are desired.)
Polyimide Parts

HEAT TREATMENT
Tech-Etch can heat-treat many materials, including Beryllium Copper, to achieve close dimensional control. Heat treatment enhances spring qualities by permitting greater deflection without compression set and without increasing the material's stiffness.
 

MINIMUM BEND RADIUS

Temper selected for a given bend radius depends on material thickness and the position of the bend with respect to grain direction.
This table shows suggested minimum bend radii.
Minimum Bend Radii
MATERIAL ALLOY TEMPER MINIMUM RADIUS FORMABILITY 90°
GRAIN DIRECTION
ACROSS 45° WITH
BeCu C172 A SB SB SB
BeCu C172 1/4 H SB SB SB
BeCu C172 1/2 H 0.5 x T 0.7 x T 1.1 x T
BeCu C172 H 1.0 x T 2.0 x T 2.2 x T
BRASS C260 A SB SB SB
BRASS C260 1/2 H SB SB SB
BRASS C260 H 0.7 x T 1.3 x T 1.6 x T
BRASS C260 S 1.0 x T 1.8 x T 3.7 x T
STAINLESS STEEL 301/302 1/4 H 1.0 x T 1.0 x T 1.0 x T
STAINLESS STEEL 301/302 1/2H 1.0 x T 2.0 x T 2.0 x T
STAINLESS STEEL 301/302 H 2.0 x T 4.0 x T 4.0 x T
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