ER tool holder
Working principle: The tapered spring collet is used to gradually shrink during the axial movement (locking) to clamp the cutting tool;
Scope of application: drill bits, reamers, finishing end mills, etc.;
Features: Large clamping range; good versatility; high precision (some manufacturers);
Key point: Whether the spring collet can shrink perfectly and evenly is one of the key factors that determines the runout accuracy. The bearing nut can greatly reduce the torque on the collet during locking.
Hydraulic tool holder
Working principle: Use hydraulic pressure to shrink the inner diameter of the tool holder to clamp the cutting tool;
Scope of application: high-precision processing of end mills, carbide drill bits, diamond reamers, etc.;
Features: Easy to operate, only one T-shaped wrench can be tightened, which is the simplest clamping method among all tool holders; the accuracy is stable, and the tightening force does not directly act on the clamping part, even new operators can Stable clamping; completely waterproof and dustproof; good anti-interference performance. Some slender hydraulic tool holders on the market are comparable to the anti-interference performance of heat shrink tool holders.
Heat shrink tool holder
Working principle: The difference in thermal expansion coefficient between the tool handle and the cutting tool is used to clamp the cutting tool;
Scope of application: processing occasions with high interference conditions;
Features: Good anti-interference; small clamping range, can only clamp cutting tools of one size; good initial runout accuracy (declines quickly with the increase of heating times); requires a special heating and cooling device, poor safety, and difficult to operate High personnel requirements
Powerful milling cutter holder
Working principle: The cutting tool is clamped by pressing the nut to shrink the tool handle body;
Scope of application: heavy cutting of end mills;
Features: High rigidity; strong clamping force, the largest among all clamping tool holders; poor interference resistance; (Recently, some manufacturers have launched powerful milling cutter holders with a nut outer diameter of only 32mm) Runout accuracy Generally, it is generally below 0.02mm, but some manufacturers have achieved 5~10μm;
Key points: Whether the elastic deformation is uniform and whether the amount of shrinkage is sufficient. (The chuck’s thickened design can increase rigidity and withstand heavy cutting by end mills).
Side lock tool holder
Working principle: Lock the cutting tool through the side fixing screw;
Scope of application: Used for rough machining of drill bits, milling cutters, etc. with flattened shanks;
Features: Simple structure and large clamping force; but poor accuracy and versatility.
