1  Precision balancing spindle     2  Toolholder adapter     3  Tool / toolholder     4  Spindle drive     5  Motor control     6  Linear optics laser     7  Piezoelectric measuring pick-         ups for measuring plans 1 & 2     8  Incremental generator     9  Rotational sensor   10  Measuring computer   11  Monitor VGA/display   12  Protocol printer

The HOFMANN balancing machines for toolholders type PTB (Portable Tool Balancer) utilize the force measuring principle to obtain a permanent load-independent calibration. They are easy to operate and require only minimal training for personnel to use them with optimum results. The use of piezoelectric measuring pick-ups in conjunction with speed-variable drives allows operation at low rotational speed with higher initial unbalance as well as for extremely high precision balancing using high- speed.
	Rotor data menu for geometric tool dimensions. Data input via 8 function keys and 2 arrow keys only.
A characteristic feature besides the force measuring principle is the high technical standard of the measuring computer, which not only offers the classical unbalancing compensation, but also, due to laser supported positioning (patent), considerably simplifies the use of built-in compensation rings or sliding weights. These toolholders with integrated balancing rings can be repeatedly measured and balanced directly on the PTB Toolbalancer without machining (mass removal) when the associated HOFMANN- split angle-compensation method is applied. This simplifies and accelerates the balancing process considerably and prevents the destruction of the toolholders due to repeated drilling, milling or grinding !
	Unbalance data display and 'Double Arrow' positioning aid. Selection of the display modes and activation of the protocol printout via function keys.
The necessary directions for positioning the weights or rings are indicated on the display supported by the switched laser pointer for convenience.