CNC toolmaker

Where BIG-PLUS uses the taper and flange contact, HSK—hohl shaft kegel (HSK) in German—works by elastically deforming the tool holder. Fingers inside the hollow shank of the tool holder clamp the holder by pushing out. High spindle speed and centrifugal force actually strengthen HSK clamping.

CNCtools Bit

Consult your user manual for machine clamping knob specifications and requirements. BIG DAISHOWA pullstuds are specified not only by standard but also OEM where applicable.

We assist with product, account and procedure questions. We design tool set-ups, schedule service calls and help our customers receive the maximum efficiency from our tooling.

As speeds and feeds have increased over the years, the shallower 1-to-10 taper ratio of the German hollow taper shank has proven effective.

Cnc toolholder

Most manufacturers specify a standard, such as ASME, JIS, MAS, ISO or DIN. However, they may also include some additional sealing features that are not specified in the standard and are unique to their equipment.

Keep an eye out for unlicensed, dual-contact tooling that is not BIG-PLUS. They will not perform as well as licensed BIG-PLUS tooling. The licensed system, developed by BIG DAISHOWA, allows holders to contact both the spindle taper and the spindle face flush, simultaneously.

Side-lock holders are the exception. By design, they do not spin on a true centerline and must be balanced after assembly.

Cnc toolkit

Choosing the right tool holder depends on a wide array of variables. For instance, if high-speed machining is the job, balance may be a priority in selection. If a long tool is called for, vibration control might be at the top of the list. If controlling carbide costs or extending tool life is important to a job, there are different ways to approach choosing tools.

CNCtools list

We offer a wide range of tool holder technologies for the highest possible performance in specific types of applications. Including collet chucks, mechanical milling chucks, hydraulic chucks, shrink fit holders, side lock end mill holders, shell mill adapters, and tapping chucks.

In most cases, users can skip balancing operations with holders from BIG DAISHOWA. Our holders are designed and built with extreme runout accuracy and control. As a result, when assembled properly, everything—cutting tools, collet nuts and pullstuds included—will spin on the same centerline as the spindle.

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CNC tool holders are the interface between the machine spindle and the cutting tool. BIG DAISHOWA offers a wide variety of shanks common to the market, including both BIG-PLUS and standard versions of DV(DIN69871), BT(JIS B6339), and CAT(ASME B5.50) steep tapers as well as HSK (ISO12164) hollow shank tapers and BIG CAPTO (ISO26623-1) polygon taper shanks.