Dispositivos de fixação de cortadores para fresadoras

Cutter clamping devices for milling machines

June 28, 2024 Roberto Magalhães

Fixing and driving devices for cutters for milling machines

The following clamping and driving devices are used to hold and drive the cutters.

1. The arbor

A chuck is a cutter holding device with a tapered shank to fit the tapered hole of the machine spindle; the short or long shaft end is used to mount and drive one or more cutters. having holes that fit the arbor. Standard milling chucks are made in three styles: A, B, and C.

2. A draw-

At the bar
It is fitted through the spindle, screws onto the spindle and holds it securely to the spindle. Drive keys on the nose of the spindle fit into slots on the shaft flange, providing positive (non-slip) drive.

Draw screw - chuck and cutter clamping assembly diagram

3. The adapter

An adapter also has a tapered shank to fit the spindle hole, but the opposite end has a straight or tapered hole to hold end mills, tapered collets, spring catchers, and small chucks.

4. Spring Chuck

A spring chuck is an adapter that can be mounted on the spindle to hold and drive spring collets. A typical collet set includes sizes from 3.18 to 25.4 mm (1/8 to 1/8 inch) in diameter to hold drill bits, straight shank cutters, and end mills. The collet holder has a tapered shank ground to fit the taper of the spindle. The collets are held and precisely located in the holder by a union nut, which forces the collets to taper against the internal taper of the holder, securing the collets firmly to the shank of the tool being held. Some other types of clamps/devices are also used to hold cutters and tools depending on the nature of the work.

5. Sleeves

They are used to reduce the internal taper of the spindle or adapter to receive smaller tapered shank tools.

6. Cam Lock

The cam lock is a device on router adapters; It is designed to provide positive locking, triggering and quick release for end mills and other adapters attached to them.

7. Quick change spindle nose

It is a specially designed accessory that can be attached to the spindle tip to hold chucks and adapters. Multiple cutting tools needed to machine a job can be mounted on adapters or in a chuck and each used in sequence without changing the job configuration. A special clamping ring, threaded on the outside, is screwed to the spindle end. Adapters and mandrels are placed on this clamping ring and held in place by a ring nut. As a socket screw is not required, a lot of time can be saved when changing cutters.