Chucking Reamers

Chucking Reamers

AIMS Industrial stocks HSS chucking reamers for machine reaming on lathe, drill press and CNC machining centre — precision toolroom cutters designed to bring a pre-drilled or bored hole to a specific finished diameter with tight dimensional tolerance and a fine surface finish. Where a drill leaves a rough, slightly oversized hole with tool marks on the bore wall, a chucking reamer finishes the hole to a controlled tolerance class, producing a surface suitable for bearing fits, pin locations, dowel holes and seal bores. Sutton and Dormer are the primary brands — well-regarded in Australian toolrooms for consistency and long tool life on ferrous and non-ferrous materials.

Straight Flute vs Spiral Flute

Chucking reamers are available in two flute configurations. Straight flute reamers produce a fine, consistent finish on through-bores in medium to low rigidity setups such as manual lathe tailstock work and sensitive drill press applications — they are the standard choice for general toolroom reaming. Spiral flute reamers cut more aggressively and direct chips away from the cutting zone more efficiently, making them the preferred choice for deep bores, blind holes, interrupted cuts and CNC work at higher spindle speeds. The helix also produces a smoother bore finish on materials that tend to drag or tear under straight flute action.

Size Range and Shanks

The range covers metric diameters from 1 mm through to 50 mm in 0.5 mm increments, with imperial sizes from 1/16″ through to 2″ for inch-dimensioned components and legacy equipment. Shank configurations include straight shank for Jacobs or ER collet chuck mounting and Morse taper shank for direct tailstock mounting on lathes. The right shank for your machine eliminates adaptor stacks and maintains the rigidity essential to good reaming results.

HSS and HSS Cobalt Grades

Standard HSS chucking reamers handle the full range of engineering steels, cast iron, brass, bronze and aluminium at moderate speeds — typically 20 to 60 SFM depending on material and bore diameter. HSS cobalt reamers are specified for harder materials, stainless steels, heat-resistant alloys and production applications where higher cutting speeds are required to maintain throughput. Cobalt grade tools retain their cutting edge at elevated temperatures and resist the built-up edge that can occur when reaming work-hardening materials. For most toolroom and maintenance applications, standard HSS provides adequate tool life at lower tooling cost.

Tolerances and Applications

Chucking reamers are used wherever a drilled hole must be brought to a specific tolerance class — typically H7 for sliding fits and clearance locations, H6 for precision fits, or custom tolerance bands specified by the designer. Common applications include finishing bearing housing bores to accept bearing ODs without press interference, producing dowel pin holes in jigs and fixtures, reaming pivot and hinge pin bores in fabricated assemblies, and preparing hydraulic cylinder and valve port bores for sealing. Achieving surface roughness values in the Ra 0.4 to 1.6 µm range is routine with quality reamers and correct cutting parameters.

Setup and Technique

Reaming relies on rigidity throughout the setup — floating holders or poorly supported workpieces lead to bell-mouthing, chatter and oversize bores. The pilot hole should be left 0.1 to 0.5 mm undersize depending on reamer diameter; too small an allowance causes premature wear and poor finish, too large causes the reamer to cut on the outer corners and produce an oversize result. Cutting fluid appropriate to the workpiece material should be applied throughout — soluble oil for steel and cast iron, neat cutting oil for aluminium and brass. For assistance selecting the right chucking reamer grade, size or shank configuration for your application, contact our team. AIMS Industrial has been supplying precision tooling to Australian workshops since 1988.