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Precision Machining as it Relates to Molds, Dies and Build to Print Tooling

Mold Design & Manufacturing for a Prototype Overmold

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At B&J Specialty, Inc. our in-depth knowledge of both die engineering and injection molding technology makes us the preferred partner for many prototype development projects. When combined with our flexible working environment, we are able to meet complex requirements under very tight deadlines. In less than 5 weeks time, we were able to help a customer go from prototype to production for the overmolded part shown here.

Working with the part specifications, our engineering team used state-of-the-art modeling software to design the tooling and execute performance analysis/process simulation to determine the feasibility of using an overmolding process. Upon verification of insert fit, we fabricated the tooling using a variety of techniques, including laser cutting, wire EDM, milling and grinding. Featuring dimensions of 8-7/8” in length, 13-1/2" in width, and 10” in height, we fabricated the tooling to within precision ± 0.0005” tolerances, and with a refined SPI B3 finish that would give the part a slightly glossy shine and very good release.

Our expertise with overmolding, and the outstanding reliability of our mold design and construction, ensured that these parts would be manufactured with quality and integrity. To learn more about this project, or if you have one similar in scope and would like to discuss it in detail, Contact Us us today.

Highlights of this Injection Molding Die Prototyping Project

Product Description
Single Cavity Prototype Overmold
Molding Die Prototyping Capabilities Applied/Processes
  • Feasibility Studies
  • Material Procurement
  • Mold Design
  • Laser Cutting
  • Grinding
  • Milling
  • EDM – Wire and Ram
Equipment Used to Manufacture Mold
Mazak VTC 300C, Roders Tec Finishing Mill, OKK VP 600, EDNC 65 Makino Sinker, EX 30 Mitsubishi Sinker, Okamoto Auto Grinder, Mitsui Manual Grinder, Manual Milling
Overall Mold Dimensions
Length: 8 7/8"
Width: 13 1/2"
Height: 10"
Mold Weight: 184 LBS
Tightest Tolerances
± 0.0005"
Material Used
H-13, P-20, Graphite
Material Finish
In process testing/inspection performed
Verification of Insert Fit
Industry for Use
Automotive Injection Molding
Delivery/Turnaround Time
5 Weeks
Delivery Location
Standards Met
Customer Specifications
Product Name
Single Cavity Prototype Overmold

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