24 cavity Ball Mold DesignSeabrook Plastics

This presentation shows a tooling design that we did for one of our customers for a tight tolerance plastic ball. The part had to be perfectly

concentric and held to a very tight size tolerance. The solution we came up with was to build a ‘Ball Blank’ mold. We then had the plastic blanks

‘ground’ to final size. This was done at a precision grinding source that we partnered with to make the final part to size. We handled the entire

project for our customer, from finding and partnering with a precision grinding source, to building a prototype tool to determine the optimal ball

blank size, to having the production tool built. The attached shows the tooling presentation we submitted to the customer for final approval of the

production tool design. The customer was very happy that we were able to solve the size issue and deliver them a part that met their stringent

tolerance requirements within their timeframe needed.

Details• Base: DME 1012-17-17 #2 steel• Cavities: 5.750 in. square H-13 (50-52 rc)• OSCO 4 drop MGN manifold w/ AFM series 20 nozzles• DME Pn: PTC-5-TB-G-TS Terminal box W/ PIC-5 and MTC-5 connectors (5 zone)• Glastherm high temp Insulator plate (top / bottom)• ½” Sprue radius, 2-KO holes: 3.500 in. off center, Ej. plate stroke: 1.812 in.• .750 Dia. Guided Ej. with Solid bronze bushings• PCS Armorclad coated Ej pins (.1875 Dia.)• 1.250 Dia. x 3.5 Pillars (3) • 1.250 Dia. Springs x 3.5 med. blue Raymond (4)• .750 Dia. Taper locks (2 sets)• Progressive Shot Counter Pn: CVRL-23• Components not specified are DME or PCS equivalent • 300 series H2o fittings• Part sub gated to .009 in. raised teardrop bump, gate to pass .030 pin, .125 ball

runner

Base (overall sizes)

“In Press position”

Top Clamp plate removed

A-Side

A-Side (w/ A-Plt and Cav. removed)

Osco MGN manifold

B-Side

Ejector System

Parts, gates and Ej. pins shown

Bottom view showing “bump”

Close-up Of “bump”

B-Side Cavity cut-away to show water (A-side identical, mirrored)

Section (centerline)

Section (along part

C/L)

Sect. close-up (part removed)

Close-up (part shown)