MQR Series Solid Carbide Micro Profiling Boring Bars for Complex Internal Machining

MQR tools are designed for complex internal profiling, precision boring, contour turning, chamfering and shoulder finishing inside small-diameter bores. The profiling geometry is suitable for components containing multiple internal transitions and restricted features.

The 47-degree geometry describes the cutting-head orientation shown in the dimensional drawing. It provides access for internal contouring, angled transitions and profiling around internal shoulders. It is not a 47-degree threading profile.

Standard MQR models are available with actual cutting diameters of Ø2.9, Ø3.9, Ø4.9, Ø5.9 and Ø7.9 mm. The selected cutting diameter must provide sufficient clearance for tool entry, machining and retraction.

Standard tip-radius options range from R0.05 mm to R0.40 mm. Available radii depend on the selected cutting diameter and clearance length. The radius should be matched to the required component corner and profile transition.

Standard cutting depths range from 0.7 mm to 2.1 mm, while clearance lengths range from 9 mm to 25 mm. The available cutting depth and reach depend on the selected MQR model.

Primary applications include carbon steel, alloy steel, stainless steel and copper alloys. Selected pre-hardened steels, steels below approximately 48 HRC, cast iron and titanium alloys can also be machined with suitable cutting parameters and edge preparation.

Yes. Application-specific coated versions are available for machining titanium alloys. The coating, carbide grade and edge preparation should be selected according to the titanium grade, bore geometry, cutting depth and coolant conditions.

Select the tool according to bore diameter, cutting diameter d1, tip radius R, cutting depth Q, clearance length L1, shank diameter D and overall length L. The 47-degree cutting head and relieved neck must have sufficient clearance throughout the complete programmed toolpath.

Choose the shortest clearance length that can safely reach the internal feature. A shorter working section normally provides greater rigidity, lower vibration and more consistent dimensional accuracy.

Select a tip radius that is equal to or smaller than the minimum component corner radius. Smaller radii provide better access and lower cutting force, while larger radii provide stronger edge support but require additional profile clearance.

Yes. When the component geometry and toolpath provide sufficient clearance, an MQR tool can perform small-bore turning, internal profiling, chamfering and shoulder finishing. This may reduce the number of tool changes required for complex internal components.

Use the largest practical shank diameter, minimize tool overhang and use a rigid precision holder. Check tool runout, cutting-edge orientation and center height before machining. Begin with conservative cutting parameters when using long-reach tools.

Complex internal profiles may create interference between the workpiece and the cutting head, relieved neck or shank. Simulate the entry, cutting, profiling and retraction movements before production to confirm sufficient clearance.

Coolant is recommended when appropriate for the workpiece material. Directing coolant toward the cutting zone helps control temperature and remove chips from restricted bores. Chip accumulation should be avoided when machining blind or complex internal features.

MQR tools use a 47-degree profiling geometry intended for complex internal contours and compound profile transitions. MPR tools use a 22-degree geometry for internal profiling, boring, chamfering and shoulder machining. Selection should be based on the component profile and available tool clearance.

Yes. Cutting diameter, tip radius, cutting depth, clearance length, shank diameter, overall length, coating and cutting geometry can be customized according to component drawings or reference samples.

Please provide the standard model or component drawing, bore diameter, internal profile, minimum corner radius, machining depth, workpiece material, tolerance, required quantity and any coating, laser-marking or packaging requirements.

The standard minimum order quantity is 10 pieces. Mixed-model and sample-order requirements can be reviewed according to the selected sizes, quantity and available stock.

Yes. Mixed-model orders can be reviewed according to the selected cutting diameters, tip radii, clearance lengths and available stock. A model list is recommended for quotation and order confirmation.

Yes. OEM services can include custom model coding, laser logo marking, branded labels and private-label packaging for cutting-tool distributors and industrial suppliers.

In-stock standard models can normally be dispatched within 1–3 working days after order confirmation. Lead time for customized tools depends on the dimensions, profile geometry, coating, quantity and production requirements.