When looking for toolholder solutions for any type of machining, it is always good to first focus on three main features that a toolholder must bring you:

1. Rigidity
Rigidity comes from sufficient taper contact and proper clamping of the toolholder in the machine tool spindle.

2. Accuracy
Accuracy comes from minimal run-out at the cutting edge of the cutting tool.

3. Balance
Balance comes from a balanced assembly of the toolholder (including all accessories such as pull-studs) and cutting tool combination.

However, the requirements in the mold and die industry are much more precise than general machining, so more attention must be made toward the selection of the appropriate toolholder for the job.

For example, a mold shop often must think of the following:

Geometry of toolholder to avoid collisions with the workpiece. In regards to the EDM process, electrodes must be machined accurately and efficiently. Oftentimes, deep ribs are required in the part process and often present challenges. Also, deep cavities such as large door panel or bumper molds require deep reach with extreme clearances.

Cleanliness of the toolholder to avoid excessive run-out, especially when machining graphite.

Extending cutting tool life since high-end cutting tools are needed to obtain the best performance in the shortest time possible. These cutting tools often have exotic coatings that lend to an expensive price.

Finish. Higher speeds and feeds are used with lower depth-of-cuts, which translates into better surface finishes. This makes balance even more important to minimize vibration at the cutting edge of the cutting tool. Also, proper chip evacuation provides better finishes.

Based on these additional requirements, most mold shops have found that due to some inherent benefits, shrink fit toolholders give them the best opportunity to accomplish the job competitively and accurately. Also, the evolution of inductive shrink fit machines has made the shrinking process easier, quicker, safer and less costly to invest in this technology up front.