Machining vibrations, also called chatter, correspond to the relative movement between the workpiece and the cutting tool. The vibrations result in waves on the machined surface. This affects typical machining processes, such as turning, milling and drilling, and atypical machining processes, such as grinding.
Chatter is the presence of vibrations that occur when tool pressure is too high, spindle speed is too high, or feed rate is too low. The cause of chatter can be located in either tool setup or work piece setup. Chatter is usually due to too high tool pressure or insufficient rigidity.
Secondly, how do I stop my tools from vibrating? To minimize vibration, endmill users should examine using helix angles from 30 to 60 degrees relative to the centerline of the tool. Minimize length; maximize diameter. In addition to positive rake and high helix angles, both milling cutters and endmills should be as stiff as possible.
Secondly, what is regenerative chatter?
Regenerative chatter vibration arises due to interaction between the machining process and the machine tool structure. Regenerative chatter occurs at the frequency of the most dominant mode of the machine tool structure.
What causes chatter?
One of the most common causes is chatter created by vibration in the CNC machine tool cutting process. Chatter is caused by the inherent natural frequency of the cutting tool. It can be triggered by many process conditions: toolholding, cutter tooling, part fixturing and machine conditions.
Why does my wood lathe chatter?
Lathe chatter is caused by the flexing of the work piece, and is more prevalent toward the center of the project where the piece is does not have as much support for the headstock and tailstock, and is more prone to flexing under pressure.
Is chattering a verb?
verb (used without object) to talk rapidly in a foolish or purposeless way; jabber. to utter a succession of quick, inarticulate, speechlike sounds, as monkeys or certain birds. to make a rapid clicking noise by striking together: His teeth were chattering from the cold.
What does a boring bar do?
The boring bar is used on a metal lathe, a machine tool that spins a part while moving a cutting tool to remove material from the part, to enlarge the inside diameter of a work piece and, potentially, to cut that dimension to a tight tolerance.
What is a speed lathe?
Speed lathe (Mach) a power lathe with a rapidly revolving spindle, for turning small objects, for polishing, etc.; a hand lathe. Speed lathe a small lathe which, from its high speed, is adapted for drilling; a hand lathe.
What is a tailstock on a lathe?
A tailstock, also known as a foot stock, is a device often used as part of an engineering lathe, wood-turning lathe, or used in conjunction with a rotary table on a milling machine. It is usually used to apply support to the longitudinal rotary axis of a workpiece being machined.
What is the feed rate on a lathe?
Feed rate is defined as the distance the tool travels during one revolution of the part. Cutting speed and feed determines the surface finish, power requirements, and material removal rate. The primary factor in choosing feed and speed is the material to be cut.
What is machine vibration?
Vibration is simply a back and forth movement—or oscillation—of machines and components in motorized equipment. Vibration in industrial equipment can be a symptom, or cause, of a problem, or it can be associated with normal operation. As machine speed increases the effects of imbalance become greater.
What are the different lathe cutting tools?
Following are the different types of lathe cutting tools: Turning tool. Chamfering tool. Thread cutting tool. Internal thread cutting tool. Facing tool. Grooving tool. Forming tool. Boring tool.