Zone: Bar Feeds

OVERVIEW: Bar feeders are perhaps the most common automation accessories used in metalworking. Generally applied to turning machines they, are designed to deliver a continuous supply of raw machining stock in the form of round, hex, square, and extruded shapes for the manufacture of parts of rotation. Able to accommodate stock of 20, 12, 6 and 4 foot lengths, the bar feeder attached to the machine tool at its headstock end. There are two common types of bar feeds available: hydrostatic and hydrodynamic. In hydrostatic bar feeds, the bar rests in a series of channels that clamp down on the top and bottom of the stock to hold it in place. In the hydrodynamic bar feeds, the stock is held in a feed tube surrounded by pressurized oil. This allows for faster spindle speeds, but it also increases change-over time from one bar diameter to another. Increasingly, bar feeders are being equipped with "magazine" storage units that are capable or significantly increasing the amount of stock that can be run unattended through the machine tool. In some "light's out" untended machining operations these magazine feeders can supply enough stock for a machine to run a full shift without intervention. Historically bar feeders are applied in single spindle turning machine tools, multi-spindle machines and some rotary transfer machines. Several machine builders have recently incorporated the bar feeder on vertical machining centers. Among the drivers for this development are simplified fixturing for the machining center, continuous supply of blank material for longer production runs, and the ability to perform 5 and 6 sided machining to produce complete parts. Bar Feeder Trends: Quick change guide channels Remnant reduction Bar fed machining centers Short length bar feeders Magazine fed bar feeders Untended light’s out machining Swiss type bar feed response Double pusher design Bar whip reduction

Featured Zone Content

Peak Performance in the Machining Lab

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Laser Device Helps to Align Bar Feeders

One of the most common issues affecting bar feeder performance is wear and tear on the bar feeder liner or collet caused by inaccurate alignment between the bar feeder and the lathe....MORE

Barfeeding Small Diameters

This shop may be located off the beaten path but it’s certainly found a successful and profitable home by applying top of the line technology to its medical part production mix. ...MORE

Dunham Bar Pull Systems Add Inch and Metric Sizes

Dunham Tool has further expanded its line of barstock pulling bar pull systems to include select additional inch and metric sizes for use on CNC lathes. ...MORE

LNS Low-Cost Bar Feeder with High-Tech Features

GT 326-E, an automatic magazine bar feeder for sliding headstock machines from LNS, is designed to load 12-ft. long barstock with diameters from 3 mm to 20 mm (26 mm with bar prep). ...MORE

Minuteman 320 SE Bar Feeder for CNC Lathes

Edge Technologies’ Minuteman 320 SE, a 12-ft. magazine bar feeder, is designed for feeding round, square and hexagonal barstock into CNC lathes. ...MORE

Haas Bar Feeder Features Re-Engineered Design

The Haas bar feeder, which provides a simple way to automate part production on Haas turning centers, features a re-engineered, heavy-duty—yet still compact—design that boosts productivity and streamlines turning operations, the company says. ...MORE

Haas bar feeder

Reengineered Bar Feeder Connects Directly to Lathe Control

Haas’s reengineered bar feeder is designed to provide a simpler and more affordable way to automate part production on the company’s compact turning centers. ...MORE