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Mollart Engineering’s Bencere E-Z Burr deburring tool saves 30 minutes per part in overall production time when replacing manual deburring of items such as aero-engine turbine stators.

By including the Bencere E-Z Burr tool into a programmed single cycle on a machining centre and run at 650revs/min with a feed rate of 0.1mm/rev, the corners of each of the three holes are able to be automatically chamfered on the respective faces of each flange.

The introduction of the Bencere E-Z Burr series of deburring tools expanded the portfolio of Mollart’s ‘Hole Solution’ branding and can be programmed to consecutively machine away burrs or create chamfers on the edges of holes as small as 1mm diameter at both the front and back of a component in a single pass.

The tools can be incorporated into CNC lathe and machining centre cycles as well as special purpose machine tools and, depending on the operational circumstances, can be used in conjunction with power tools and by hand.

The E-Z Burr concept is ideal for chamfering and removing burrs from cross holes and hole breakthroughs, combined front and rear chamfering of bores, internal grooves and recesses, fabrications and internal surfaces such as within box sections.

The tools, which are available from Mollart Bencere in Stratford-upon-Avon, comprise an extended blade, having either one or two cutting edges, that are located via a dovetail in the holder.

The dovetail, which also acts as a fulcrum, enables the cutting blade to become a flexible arm pivoting in the holder.

There is a choice of solid carbide or high speed steel (HSS) blade.

Both can be changed within a few seconds on the machine tool without upsetting the chamfer setting on the component by a simple one-eighth counter-clockwise movement of a lock screw on the side of the holder.

The solid carbide tool can also be used on heavy burrs at elevated cutting speeds that are at least three times greater than the HSS version.

Tough and exotic materials as well as non-ferrous can be machined and due to the durability of the carbide and the TiN coating, tool life should be some five-times greater than the HSS version.

In use, the tool is fed into the workpiece and as the extended blade contacts and cuts the burr at the front, its spring-like action around the lock screw allows it to slide back into the holder.

Once the blade has retracted completely, the tool is able to continue through the bore of the component and due to the polished crown on the top of the blade, there is no marking or scoring of the hole.

Once the tool clears the back of the bore, the blade and cutting edge flex back out of the holder and as the direction of feed is reversed, any rear burr or chamfer is cut as the tool begins to withdraw.

With the cutting cycle complete and the blade once again fully retracted into the holder, the tool can be withdrawn under a rapid rate of feed.

There are two styles of HSS and carbide blade with B catering for both front and rear cutting, while R is used for applications requiring only rear or back chamfering.

The HSS blades are available with standard and positive cutting rake angles and the carbide inserts have a positive rake angle with a series of geometries to suit a wide range of materials.

While the Bencere E-Z Burr HSS series of tools range from 1mm to 50.8mm diameter, the carbide tool version is suitable for diameters from 3.17mm to 25.4mm.

Other sizes of tools are available for larger bores as well as customised and combination tools that are able to provide combined drilling and deburring from the same tool position.

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