Feb 1, 2022
This is a tolerance which is usually specified for cylindrical parts.
When rotating around a reference axis, the deviation of a measured value must not leave the tolerance field defined by two concentric circles.
The two concentric circles are perpendicular to the specified reference axis.
The distance between the two circles is described by the value given together with the sign for radial runout.
The tolerance described in this way is called radial runout.
During one revolution around the reference axis, the specified radial runout must not be exceeded.
In addition, the tolerance zone can be defined by two parallel planes.
These are perpendicular to a specified reference axis and have the specified distance to each other.
In this case, the tolerance is also called axial axial runout.
During one revolution around the reference axis, the axial runout must not be exceeded.
Quality Assurance: Measured values in the toleranced range must lie within the concentric circles at a distance of 0.2mm
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Dec 9, 2021
Especially in technical drawings for turned parts, the tolerance mark for the roundness of a part will be found.
This shape tolerance is important when describing cylinders and tapers.
The toleranced circumferential line must lie within two concentric circles with specified spacing in all cutting planes that are executed perpendicular to the center axis.
The tolerance zone is therefore perpendicular to the axis.
Quality Assurance:
Tolerance zone by two concentric circles at a distance of 0.03mm perpendicular to the center line
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Oct 2, 2019
ComoNeo is a process monitoring system that is designed to optimize, monitor and document injection molding processes based on cavity pressure. Apart from
processing cavity pressures, the unit also allows for the acquisition and evaluation of contact temperatures from the mold and signals from the injection molding machine.
The monitoring functions in the system ensure reliable scrap separation based on the cavity pressure curve.
On the mold side, one ComoNeo unit can accommodate up to 32 cavity pressure sensors and up to 16 contact temperature sensors. On the machine side 12 digital inputs, 24 digital outputs, 4 analog inputs and 1 analog output are available.
Quality: The process monitoring system
ComoNeo.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Dec 9, 2021
Concentricity refers to a center of circular surfaces if the diameter of a cylinder is smaller than its hight.
In this case, for example, the center of a hole must be inside a circle of the specified diameter.
This applies around a reference point in the cross section.
For coaxiality, the axis of a selected diameter must be within a tolerance zone, which is represented by a cylinder of given diameter.
The axis or directional normal must lie on a common reference axis A-B.
The rule that cylinders with diameters greater than their height are tolerated via concentricity serves to distinguish the two terms.
Otherwise, coaxiality is tolerated.
Quality Assurance: The axis of the diameter must be within a cylinder of 0.02mm (reference axis A-B)
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Circular runout
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Oct 13, 2020
There are plastics (like Polyamide) which are brittle in the dry condition (water proportion < 0.2 %).
The plastic part gets more elastic when water up to 3.5 % is absorpt.
The storage and water absorption in moistured athmosphere or in a water bath until the weight is consistent is called conditioning.
The conditioning occurs by diffusion and may take several days.
The process is reversible.
A polyamide is elastic after
conditioning.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
