We handle all the shrinkage on our end.  It is your job to provide a model and print with tolerances to what you want.  We add shrink based on material family during the mold making process

We will look at your model and decide the best location for ejector pins.  larger pins are beneficial but can interfere with cooling.  outside of ejector pins, stripper plates, and sleeve ejectors can be used.  We try not to eject the part in a location that compromises visual surfaces

In almost every case we look for a piece of real estate on your part for date code.  This ensures another traceability tool for containment in case of any processing or material issues that could arise in the future.

Property used to define the materials ability to resist a force applied in an instantaneous implementation of a load

ASTM D2240  Method based on swing pendulum with a defined weight. Testing can be performed as Notched Izod with and without low temp definitions.

Property used to define the ability to stretch the material of a plastic

ASTM D638  Method based on indentation of specimen when force is applied.

Property used to define the length of recovery of a material after it has been stretched

ASTM D790  Method is based on measuring % of a specimen original length

ASTM D395  Method based on geometric recovery of specimen after force is applied for 24 hours.

Method based on measuring deformation at time intervals from 1 to 1000 hours

Property used to define the amount of growth or shrink a specimen exhibits during temperature change

ASTM D696  Method based on measuring the % coefficient of linear change in length of a material relative to each degree of temperature change

Property used to define a slow deformation phenomena while under constant strain (also known as “Cold Flow”)

ASTM D2990  Method based on measuring deformation at time intervals from 1 to 1000 hours

ISO27 Property used to define a material deflection perpendicular to force applied

Method based on indentation of specimen when force is applied.

There are many factors that go into pricing the best mold for your part.  Starting from the top;  the size of your part, the complexity of the part, the material you want your mold made from (P-20 steel, Nitride hardening, H13)  2 plate mold or 3 plate mold with stripper plate, auto degating, ejection system, cooling requirements, lifters and slides for undercuts, hot manifold or hot tip.   There are a number of complex scenarios at play, some other big considerations include expected annual usage, expected future date design changes, and even target material selection also play a huge part in this prescription.   The more you know about what you want the better we can determine the best fit for you.

As a rule of thumb 1 Degree is a preferred minimum on surfaces.  in some case we can get away with as low as .25 degrees in tight areas where sizing is important to design intent.  In other cases,no draft, or even reverse draft with small undercuts can be achieved.  This depends on the geometry and material target deflection.   On any surfaces that are cosmetic where we will be applying texture please refer to our texture spec guide that indicates minimum draft requirements.

Property used to define the plastics ability to withstand tensile stress while being pulled or stretched without failure

ASTM D638  Method based on pulling a dog bone specimen and reading the rate at which the material yields or breaks

Property used to define the plastics ability to withstand tensile stress while being pulled or stretched without failure

ASTM D638  Method based on pulling a dog bone specimen and reading the rate at which the material yields or breaks

Property used to define the plastics ability to withstand tensile stress while being pulled or stretched without failure

ASTM D638  Method based on pulling a dog bone specimen and reading the rate at which the material yields or breaks