Air Bubbles and Slits in the Plastic Molding Part

In precision plastics CNC parts machining process, we use plastic rods with precise external diameter for efficiency CNC fabrication.

How to obtain plastic rods?

The melted raw plastic will be injected and pressed into metal mold to form plastic rods with high pressure. Then, harden the rods by forced air cooling. These plastic rods can be used for CNC precision manufacturing.

What cause an extrusion plastic rod to develop a crack?

Regarding the cracks in plastic workpieces, four conditions have to be carefully considered during extruding process: heat, pressure, flow and cooling. Recently, we received PPS plus 40%GF plastic raw material rods from Australia customer. Unfortunately, lots cracks observed internally in the rods when pre-cut the material into billet before CNC precision manufacturing process. See below cut parts photos.

plastic workpieces
plastic workpieces

cut parts photos
cut parts photos

This type of cracking caused by internal stress was mainly resulted from cavity working pressure and also forced air cooling. Sometimes, these cracks can damage the cutting tool when manufacturing precision plastics machined parts. Gas or liquid leakage might be happened on the plastic components with cracks inside.


Customers who also checked:

CNC Aluminum Parts Stainless Steel Parts Stamping Parts Precision Plastics

We are well-experienced at:

Turning / Milling Parts
Stamping Parts
Aluminum / Zinc Die Casting Parts
Injection Tooling Parts

We have excellent capability to produce turning and milling machining parts with multi-spindle machines in mild steel, brass, stainless steel, aluminum and plastic. All of specification is strict with customized requirement the minimum tolerances could be up to +/-0.002 mm. All kind of plastic parts can customized in ABS, HDPE, LDPE, Nylon 6/66, PC, PEEK, PET-P, PFA, POM, PP, PPS, Teflon, etc.

Besides, we also provide professional surface treatment service for all of machining parts, including grinding, deburring, heat treatment, plating, coating, painting, etc.

We manufacture each part with great enthusiasm to meet our customers’ needs all over the world. If you have any requirement, please contact us without hesitation.


Why We Offer CNC Machining

CNC (Computer Numeric Controls) machining revolutionized the metal and plastic shaping industry. APPORO Industries Corporation offers CNC metal and plastic machining service for a large variety of applications.

In the past, traditional metal and plastic forming process is involved building dies or toolings which needed to be designed and tooled. Some of these dies or toolings are used to stamp the metal into various profiles, the others are for metal die casting or plastic injection molding. With the introduction of CNC Turning Milling machining machines, the creation of the dies and retooling assembly can be one of the choice for precision machining method. CNC involves programming the design code into the machines which can create several different parts from the same blank sheet or rod of metal and plastic with exacting precision and tiny tolerance.

Brief History of CNC Machining

The first NC machines were built during the 1940s and 1950s, based on existing lathe machines that were modified with motors that moved the controls to follow points fed into the system on punched tape.

CNC machines that actually began to use in metal and plastic machining service supplier in a few decades ago. CNC milling and CNC lathe machines are now the most versatile and the most valued machines in modern precision machining industry.

Benefits of using CNC Machining Service

There are a number of various benefits from using CNC milling and turning machining service:

Instant production

In many cases, CNC precision parts machining service can be quickly supplied almost instantly to meet fastest prototyping or FAI requirement.

Costs saving

Due to quick CNC precision manufacturing production, the need for stock inventory can be eliminated on special purpose. So, basic costs shall be reduced significantly. Generally, no mold or jig charge required.


Automatic CNC parts production keep our operators from harm’s way allowing for a much safer work environment.


Because the CNC cutting tools are controlled by a computer, our CNC lathe and milling machines can easily reach within 0.002 mm tolerance as long as the conditions of the spinning material on the CNC machines are set to optimize the cutting process.