Straight stylus, M4 thread, φ5 ruby ball, tungsten carbide stem, 50 length, EWL 36mm
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 tungsten carbide stem provides exceptional rigidity, particularly for styli with small ball and stem diameters. 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.
Tungsten carbide rod is the best choice for the small diameter rod or super long rod with large stiffness. The small diameter rod is required for the stylus with ball diameter of 1 mm or less, while the length of super long rod can reach 50 mm. In addition, due to the possible deflection of the joint between the rod and the body, the weight may become a problem or the stiffness may be reduced.
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.