**2.11 Precision vices**

Some features of Precision vices are, use of high-grade FCO 60 body, ground top and bottom. The clamping jaws give high performance without wear and accuracy

**Figure 14.** *3D touch probe, RENISHAW OMP.*

*Micromachining and Its Applications for Electronics DOI: http://dx.doi.org/10.5772/intechopen.113892*

**Figure 15.** *Laser controlled, in process tool management system.*

in parallelism and squareness of the order of 0.02/100 mm. the jaw plates should be interchangeable. Tenon and Tenon slots are provided for effortless trueing of vice on machine table, high clamping force of the order of 5000 Kg can be achieved effortlessly so that hammering is eliminated on vice handle.

### **2.12 Spindle/tool holders/collets**

Spindles in micro-milling machines must be able to rotate at high speeds (up to 30,000 rpm) to achieve the adequate cutting speed for most materials. The spindle must also be stiff (> 25 N/μm) and have a small runout (< 1 μm) to ensure high precision in the cutting process. To achieve high speeds, spindles in micro-milling machines typically use ceramic ball bearings that are continuously refrigerated and lubricated. Micro-milling spindles are also typically low-power electro-spindles (200–500 W) or aerostatic spindles. Tools in micro-milling are typically small and delicate. The most used collets for clamping tools in micro-milling machines are precision "ER type" collets and super-precision ER type collets. Precision ER type collets can present big runout errors that depend on the clamped diameter, while super-precision ER type collets present runout errors smaller than 2 μm. Tool wear in micro-milling is quite high, so it is usual to use two or more mills per operation (one for rough machining and one for finishing). Tool change is a critical operation in micro-milling because the tool runout, tool height, and collet runout are modified. Therefore, tool change must be performed carefully, cleaning all the shank, collets, tools, and nuts and applying controlled torques [46].

### *2.12.1 HSK dual-contact tooling*

The HSK tool holder is a popular alternative to the conventional steep-taper spindle connection for high-speed machining (HSM). HSK tool holders offer several advantages, including:

• Simultaneous fitment on both the taper and face at the front of the spindle: This provides increased rigidity of the joint and improves accuracy.
