Some knowledes I get for screw barrel

1/8 screw barrel, bottom hole size D8.5, depth/4 screw barrel, bottom hole size D11.5, depth 30MM.
If the bottom hole diameter is the same as the internal thread diameter, the tap will be stuck when the material expands and the tap will break easily
If it is too large, the tapped thread profile will not be high enough to form a scrap. According to different international standards, the thread fit requires corresponding fit tolerances.
Please refer to the plier manual. If the bottom hole is countersunk, you also need to consider the effect of tapping and cutting! Extended information During tapping of a screw, the cutting edge mainly cuts the metal but also squeezes it, which causes it to bulge and flow to the tip. Therefore, the diameter of the hole drilled (i.e. the bottom hole) should be larger than the inner diameter of the screw before tapping the screw.
The liquid flow method involves pouring a solution that dissolves the coating onto the local surface of the coating and calculating the thickness of the coating based on the time required for the local coating to dissolve. There are also the plating droplet method and the anodic dissolution coulomb method. There are many methods and varieties of producing metal coatings, of which electroplating is the most common method, followed by molten metal dip plating (hot dip plating) and chemical appearance treatment.
Organic polymeric materials (e.g., coatings) melting point of plastics, and inorganic materials (e.g., ceramics) are used to form a maintenance layer on the exterior surface of metal equipment or components. The maintenance layer completely isolates the base metal from the environmental media and prevents the base metal from being corroded in stainless steel standard media due to contact corrosion. Source Baidu Encyclopedia - screw
This is a bit complicated to say.
It depends on what extrusion screw you want to use.
Extrusion screw is divided into rubber extrusion, plastic extrusion, etc. In the case of plastic extruders, the aspect ratio and thread lead determine the reaction time of the screw, and the screw diameter determines the output.

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