LHS Rock Drilling Tools - Liaoning Machinery Equipment Sales Co., Ltd., ROOM 602, UNIT 3, BUILDING NO. 28-5, LONGJIN Street, LONGGANG DISTRICT, HULUDAO CITY, Jinzhou (2026)

26/05/2026

Safety and Operating Instructions for Tapered Rock Drill Tools
Tapered rock drill tools are core consumable accessories for handheld rock drills and small-scale rock drilling projects. To maximize product performance, effectively extend the service life of drill rods and bits, reduce common failures such as breakage and damage, and control overall construction costs, all construction personnel and management staff must follow standardized operating requirements. Unauthorized disassembly, mixed use of new and worn tools, and non-standard reconditioning are strictly prohibited. The official full-process operating guidelines for tapered rock drill tools are specified as follows:

1. Equipment Matching and Assembly Requirements

Before starting work, inspect the operating condition of the rock drill equipment, especially the wear condition of the machine bushing. If the bushing is severely worn or deformed, stop operation and replace it immediately. Special removal tools are recommended for fast and efficient replacement. Never operate with worn or damaged bushings. During assembly, do not match damaged, deformed or cracked used drill rods with new bits. Mixing new and worn tools causes unbalanced force and easily leads to abnormal tool failure.

2. Standard Disassembly Procedures

Always use the designated special knock-off tool for all assembly and disassembly work, and follow standard operating procedures. Correct disassembly practice is essential to ensure stable performance and longer service life for both drill bits and rods. Violent knocking and forced disassembly are strictly forbidden. Improper removal will easily cause typical failures, including fractured bit skirts, damaged tapers, and broken drill rods. This will increase replacement costs and delay construction progress.

3. Taper Re-tapering Regulations

If re-grinding or re-tapering is required, strict process rules must be followed. Hardening of the taper area is strictly prohibited. Re-tapering must be processed with high precision to ensure accurate geometry and correct mating angle. Poor precision will result in dimension deviation, inaccurate taper fit, and poor assembly contact. Unqualified reconditioning will reduce drilling efficiency and may damage the drill bit. No warranty claims will be accepted for any damage caused by unauthorized hardening or non-standard re-tapering.

4. Daily Management and Damage Prevention

Companies and on-site teams shall implement a full lifecycle management system for rock drill tools, including issuance, usage, reconditioning, and scrapping, to reduce abnormal wear and control overall costs. During operation, if any abnormality is found, such as shank failure, rod bending, or severe taper wear, stop using the tool immediately and scrap it properly. Never continue using damaged tools to avoid equipment failure and safety risks.

5. Efficiency and Cost-Saving Guidelines

Standard operation, regular maintenance, qualified reconditioning, and timely replacement will effectively extend grinding intervals and improve overall drilling productivity. Reasonable inventory management reduces capital tied up in stock. Under high-intensity working conditions, tapered drill tools deliver high pe*******on rates and cost-performance, achieving better quality, lower consumption, and higher efficiency on construction sites.

26/05/2026

Introducing our T45 Threaded Button Bits: 89mm diameter, deep concave core, enhanced flushing with four end holes

20/05/2026

Influence of the Selection of Top Hammer Rock Drill Tool Set on Drilling Straightness
Based on the technical test data of borehole depth and hole deviation from Atlas Copco, as shown in Figure 1, different drilling tool combinations present significant differences in borehole straightness performance during deep hole drilling, which provides a clear technical basis for drilling tool selection in blasting engineering.
According to the test data, borehole depth is positively correlated with hole deviation. Within the depth range of 15–40 m, the hole deviations of three drilling tool combinations all expand with the increase of drilling depth. The three combinations include: T38 threaded quick-change rod matched with standard button bit (T38 MF-Rod + Button Bit, Regular Skirt), T45 threaded quick-change rod matched with guided drill tube and retrac button bit (T45 MF-Rod + TDS + Button Bit, Retrac), and 64 mm TDS guided drill tube matched with retrac button bit (TDS 64 Tube + Button Bit, Retrac). Nevertheless, the anti-deviation capability of each combination shows obvious hierarchical differences.
Among them, the T38 MF-Rod has no guiding structure, with hole deviation rising fastest with depth; the deviation exceeds 1.0 m after a depth of 25 m, ranking the poorest in straightness performance among the three combinations. Equipped with a TDS guided tube, the T45 MF-Rod achieves a greatly slowed growth rate of hole deviation due to the restraining effect of the guiding structure, with the deviation approaching 1.0 m at about 35 m, and its anti-deviation performance is significantly improved compared with the pure T38 rod. Benefiting from the casing-type guiding structure and the rigidity advantage of large-size drilling tools, the TDS 64 Tube maintains the minimum hole deviation with the slowest growth rate all the time, and the deviation is still controlled within 0.5 m at a depth of 40 m, delivering the optimal straightness performance.
Combined with practical engineering requirements, drilling tool selection shall follow the principle of depth adaptability and precision priority. For shallow hole drilling (＜25 m) with low requirements on borehole straightness, the T38 MF-Rod can be selected according to construction cost. For deep hole drilling (＞25 m) or blasting projects demanding high borehole straightness, priority should be given to the TDS 64 Tube or the combined configuration of T45 MF-Rod plus TDS guided tube. The guiding structure restrains the drilling direction, and large-specification drilling tools enhance structural rigidity, so as to effectively control hole deviation and ensure the accuracy of blasting burden as well as the safety of blasting construction.
In practice, combining two typical engineering scenarios—bench blasting in open-pit iron mines and highway subgrade excavation—and adopting the tool selection logic based on Atlas Copco’s drilling tool test data, this paper analyzes the actual influence of drill tool combinations on borehole straightness and blasting effect, providing practical reference for similar engineering projects.
Case 1: 20m–40m Deep Hole Bench Blasting Project of an Open-pit Iron Mine
Engineering Background
This iron mine is a large open-pit hard rock mine with a bench height of 20 m and blasting hole drilling depth ranging from 25 m to 40 m. It requires the borehole deviation to be no more than 0.5 m to ensure uniform burden spacing, and prevent fly rocks and excessive boulder yield.In the initial construction stage, only T38 MF-Rod was adopted for drilling. The borehole deviation exceeded 1.0 m at the depth of 25 m, and the bottom burden deviation reached 1.2 m. This resulted in a boulder yield of over 15% after blasting, and local fly rocks on the bench slope posed a safety hazard of equipment damage by impact.
After replacing the drilling tool combination with the TDS 64 Tube, the borehole deviation is controlled within 0.5 m at a depth of 40 m, and the burden deviation is reduced to 0.3 m. After optimization, the blasting boulder yield drops below 3%, fly rocks are kept within a safe range, slope stability is significantly improved, secondary crushing costs are reduced by 70%, and loading efficiency is increased by 25%.
Case 2: Shallow Hole Blasting Project for Open-cut Excavation of an Expressway Subgrade
Engineering Background
The project involves earth and rock excavation for highway subgrade, with a bench height of 8 m and drilling depth ranging from 15 m to 20 m. There are low requirements for borehole straightness, while the core focuses on controlling construction cost and progress.TDS 64 Tube was initially considered for selection. Although it delivers excellent straightness performance, its procurement and application cost is 40% higher than that of the T38 MF-Rod. Meanwhile, the borehole deviation is only 0.3 m in shallow hole drilling, which exerts no substantial impact on the blasting effect.
After switching to the T38 MF-Rod, the borehole deviation reaches 0.6 m at a depth of 20 m with a burden deviation of 0.4 m. The rock fragmentation after blasting is uniform, fully meeting the block size requirements for subgrade excavation. Meanwhile, the drilling tool cost is reduced by 40%, drilling efficiency is improved by 15%, and the overall construction cost is cut by approximately 28%, which is perfectly adapted to the engineering demands of shallow hole blasting.

19/05/2026

Discover the advantage of high-rigidity drill rods. Achieve precise drilling, control blast hole deviation.

11/05/2026

Introducing our guided drill rod, designed for high rigidity. Precise drilling alignment, less deviation and rod failure.

08/05/2026

Why follow the pre-enlargement design principle in the production of Tapered Button Bits
The production of Tapered Button Bits follows the industry’s universal pre-enlargement design principle. The actual outer diameter of all finished products is enlarged by 0.5–1.0 mm compared with the nominal diameter upon delivery. This is not a machining error, but a targeted intentional design. For instance, a Tapered Button Bits with a nominal diameter of 36.0 mm has an actual diameter of at least 36.5 mm when brand new, and some even approach 37.0 mm, so as to meet subsequent application requirements.
The core purpose of this oversize design is to accommodate the initial wear characteristics of Tapered Button Bits during rock drilling operations. When in service, the cemented carbide buttons and the skirt of the bit body suffer relatively fast initial wear. The outer diameter will decrease noticeably within the first few meters of drilling. The pre-set oversize of 0.5–1.0 mm can effectively offset the rapid initial wear. It ensures the hole diameter drilled remains compliant with design specifications throughout the entire service life of the bit, preventing the problem of gradually shrinking hole diameter during drilling.
It should be specially noted that even if Tapered Button Bits are manufactured with an enlarged dimension, the actual diameter of the final drilled hole will still vary due to multiple influencing factors. Drilling working conditions, operation methods and rock geological conditions are the major factors: high rock hardness and strong abrasiveness will accelerate bit wear and result in smaller hole diameters; high impact pressure and rotating speed of the rock drill may lead to larger hole diameters; fractured rock and developed joints can cause hole wall collapse and irregular hole shapes. Therefore, the nominal size of the bit is not completely identical to the actual drilled hole diameter, and a reasonable tolerance range shall be reserved during design and construction.

06/05/2026

Every detail counts. Precision quality checks for reliable rock tools you can trust.

30/04/2026

Premium drill bits and shank adapters built for tough mining. Durable construction ensures stable performance, high impact resistance, and reliable rock drilling efficiency.

29/04/2026

Precision-engineered drill shank adapters for robust mining drilling. Crafted for durability and precise connection, ensuring stable performance in tough rock conditions.

28/04/2026

Built for heavy-duty rock drilling, this premium bit features wear-resistant carbide buttons, delivering high impact resistance, stable performance, and long service life for mining and construction.

28/04/2026

Compact underground mining drill rig: 25 tons, 51–178mm bore range. Efficient, durable for medium-deep hole mining tasks.

LHS Rock Drilling Tools - Liaoning Machinery Equipment Sales Co., Ltd.

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