Hydraulic Chucks

ETP Hydro-Grip hydraulic chucks (hydraulic tool holders) for CNC routers with HSK63F and ISO30 / SK30 spindles. A hydraulic chuck is pressurized with a wrench to center and clamp the tool in a few seconds, with minimal runout, very good repeatability and a fine surface finish. ETP has made ETP Hydro-Grip hydraulic chucks and arbors for the woodworking industry for more than 40 years.

Which ETP Hydro-Grip chuck

The G3 safety device keeps the tool from falling out when the chuck is not pressurized; the G3 is pressurized with an Allen T-wrench. The Slender has a safety feature that also keeps the tool from falling out when the chuck is not pressurized: the tool shank must have a thread that fits the safety screw (ISO 4762), M6 x 40 mm for 12 and 16 mm, 3/8" and 1/2" bores and M8 x 45 mm for 20 and 25 mm, 3/4" and 1" bores. Slender and G3 runout is 0.006 mm (0.00024") or less, measured at 3 x D. They are balanced to G2.5 at 25,000 RPM, and their maximum speed is 25,000 RPM. Pencil runout is 0.004 mm (0.00016") or less at 2.5 x D on the 50 mm reach chucks, and 0.007 mm (0.00028") or less on the longer ones (over 125 mm gauge length). Pencil maximum speed depends on the reach: 25,000 RPM at 50 mm, 15,000 RPM at 100 mm, 20,000 RPM at 110 mm (the tapered 20 mm and 3/4" chucks) and 10,000 RPM at 150 and 190 mm.

Reduction sleeves and torque wrenches

Hydraulic reduction sleeves let one chuck hold smaller shanks: the sleeve's outside diameter matches the chuck bore. ETP lists its sleeves for its Compact, Slender and Pencil chucks. See Hydraulic Reduction Sleeves. ETP recommends its Hydro-Grip torque wrench (6 Nm) for its G3 and Pencil chucks, so every user tightens them the same: Setup Tools & Wrenches.

Other holders: Collet Chucks and Shrink Fit Holders.