Straight stylus, M4 thread, φ6 ruby ball, carbon fibre stem, 150 length, EWL 138.5mm
The simplest and most frequently used type of stylus, suitable for the majority of probing applications.
Straight styli are designed to inspect simple features where direct, unobstructed contact with a measured surface is possible. A carbon fibre stem is very lightweight and ideal for applications where weight is critical. Ruby is regarded as the industry standard for stylus tips. It is one of the hardest materials available and suitable for most applications. Due to adhesive pickup, ruby tips are not recommended for scanning aluminium parts.
For most measurement occasions, ruby is one of the toughest materials with the industry standard and best characteristics. Artificial rubies were made in 2000 ° Alumina crystal (corundum) with purity of 99% was sintered by Verneuil process at room temperature.
There are many grades of carbon fiber materials. In any case, carbon fiber provides the best stiffness characteristics in tension and torsion and is extremely low in weight. Carbon fiber is a kind of inert material. Combined with special resin matrix, it has excellent protective effect in most extremely harsh machine environment.
Carbon fiber is an ideal material with the highest rigidity and light weight for the stylus rod with a length greater than 50 mm. It is the best stylus rod material for high precision strain gauge probe, and has excellent vibration damping performance and negligible coefficient of thermal expansion.
Ruby is an extremely hard material and hence stylus wear is minimized. It is also of low density, keeping tip mass to a minimum, which avoids unwanted probe triggers caused by machine motion or vibration.
Mounted on stems made from a range of materials - stainless steel, tungsten carbide, ceramic, and a specialized carbon fiber material, these simple ruby ball styli are suitable for most inspection applications.
The size of the ball and the EWL of the stylus chosen are dictated by the size of the feature to be inspected. However, keeping the stylus ball as large as possible and the stem as short as possible will ensure maximum ball/stem clearance, whilst providing a greater yet still rigid EWL. Using larger ruby balls also reduces the effect of the surface finish of the component being inspected.
*How to Choose Stylus
Try to choose the short stylus, The greater the bending or deformation of the stylus, the lower the accuracy. It is your best choice to use the shortest possible probe.
Try to minimize the adaptor, Each additional connection between a stylus and a stylus rod increases a potential bending and deformation point. Minimize the number of stylus components in your application.
The diameter of the measuring ball should be as large as possible, First is to increase the distance between the measuring ball and the stylus rod, so as to reduce the false trigger caused by the collision with the stylus rod; Secondly, the larger the diameter of the measuring ball is, the smaller the influence of the surface finish of the workpiece is.