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Frequently asked questions

The »toolBalancer« is so amazingly exact because of the center offset during measurement. This advantage applies to any tool – and especially to smaller HSC tools.

Yes, you can. The unique thing about the spindle of the »toolBalancer« is that it is universal. You can insert both ZOLLER balance adapters into the spindle, as well as adapters from other manufacturers.

Ease of servicing is the main difference from other balancing devices on the market. It starts with the »twinPanel« safety cover on the »toolBalancer«. If a part comes loose during balancing, or if the pane ages because it is in contact with oil, then it is not necessary to replace the entire cover. The cover is made of two panes. This means you can exchange only the inner pane. That is why we call it a protective pane. In addition, you have easy access to the spindle, and all electronic components are carefully and safely installed in the control cabinet to ensure error-free operation. The position of the control cabinet, drives and sensors allows the best possible accessibility for maintenance and service work.

The »toolBalancer« is a new development, and has more state-of-the-art technology and a better, more ergonomic design. This ensures high precision, simple operation, and certified safety.

This video presents exactly what the steps in the »toolBalancer«’s unbalance correction process are.

At ZOLLER, we provide a range of options for learning about an individual product. For example, we offer one-on-one meetings with experts in our virtual showroom. We are also glad to meet with you via Microsoft Teams, or by phone. You can also come by our Smart Factory.

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When a balanced tool assembly is used, it provides longer tool life, reduced vibration, higher spindle speed, better surface finish on parts, and most importantly, longer spindle life. Unbalance in a tool assembly creates excessive centrifugal forces that can damage spindle bearings. Such damage reduces spindle life and can lead to costly unplanned downtime.

Cutting tools are sometimes asymmetrical for example flats on the shank (Weldon surface), profile cutting tools can have unsymatrical weight distribution. If such cutting tools are assembled in a balanced tool holder it will add unbalance to the tool assembly. Collets, clamping nuts, stop screwers, data chips, etc. add also unbalance to the tool assmebly. Once these other components are added to the tool holder assembly, the tool holder may need to be re-balanced in order to conform to ISO balance Specifications.

ZOLLER offers special adapters for clamping bore cutters and tools with different shank sizes.

The following rule of thumb can be used as a guide as to whether the toolholder should be balanced "statically" or "dynamically":

Static: 1 Plane balancing applies to toolholders that have an operating speed of less than 20,000 rpm and where the overall length of the holder is less than twice the maximum diameter of the toolholder.

Dynamic: 2 Plane balancing applies to toolholders that have an operating speed of more than 20,000 rpm, or where the total length of the holder is more than twice the maximum diameter of the toolholder.

G indicates the balancing grade. CNC machines, machine tool drives, tool industry use G2.5 for finishing tools, G6.3 for roughing tools and G1 for grinding wheels. These are the quality grades according to DIN ISO 1940-1.

In balancing technology, there are three methods to compensate for the unbalance: 

Material addition using the screw method.
Material removal by drilling or milling.
Material displacement by unbalance rings.

If the spindle is only running at 2000 rpm because of vibration and cutting noise, then this is due to the use of an unbalanced tool assembly. If the tools are balanced, higher speeds and feeds can be used and profitability is increased.

This is the unit used to measure the unbalance. The reason for an unbalance is a rotating mass outside the axis of rotation. The unbalance is expressed as the product of this mass times the distance from the axis of rotation, e.g. in gram-millimeter (gmm) or kilogram-meter (kgm).

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