Views: 0 Author: Site Editor Publish Time: 2026-09-24 Origin: Site
Many procurement personnel selecting portable boring machines only focus on the machining diameter range, assuming that covering φ220—800mm is sufficient. However, when operating in dock pits, stern shaft tunnel cabins, and electric shovel maintenance pits, issues like roundness deviation, inner wall tool marks, and large coaxiality errors frequently occur. These are not equipment quality problems, but result from ignoring critical parameters such as boring bar rigidity, power output, feed accuracy, and on-site positioning.
The procurement review for the XDT110 cannot only verify the "220—800mm" specification line. All the following items must be itemized in technical documents and acceptance checklists.
Boring bar: φ110mm, made of bearing steel with special processing, hard chrome-plated surface, rust-proof, and excellent wear resistance.
Boring diameter: 220—800mm (can be extended up to 1500mm, subject to sub-model confirmation).
Boring span: ≤6m.
Single-side cutting depth: ≥3mm.
Spindle speed: 125r/min, with automatic feed, feed stroke 380mm.
Machining roundness: Nominal 0.05mm.
Power supply: 380V three-phase.
Spindle box: Can be installed at any position on the boring bar, with simple fixing.
Bearing support: Imported double-row self-aligning cylindrical roller bearings.
End face tool post: Supports automatic forward/backward feeding, adjustable feed rate, and can be disassembled.
Lubrication: Centralized lubrication system covering both the lead screw and boring bar.
Matching boring bar rigidity and span: The φ110 bar has excellent rigidity, but when boring a φ800 large hole with 3mm cutting depth under a 6m span, the distance between support seats should be controlled within 25—30 times the bar diameter (approximately 2.75—3.3m). Add 1-2 sets of auxiliary supports in the middle to stabilize the 0.05mm roundness.
Verifiable centering reference: For workpieces with complete holes at both ends, use the original factory taper sleeves for bar-through centering. If only one end hole is complete, use adjacent holes or end faces for alignment instead of visual estimation. The 0.05mm roundness is locked from the centering step. Require demonstrations of both alignment methods during acceptance.
Spindle box close to the machining surface: When machining the middle section hole of a stern shaft tube, move the spindle box to a position close to the target hole to shorten the overhang from the power head to the cutter disc. This improves rigidity and stabilizes the roughness. Specify "demonstration of box installation at any position" in the acceptance checklist.
Disassembly for confined spaces: The hatch of dock pits, stern shaft tunnel cabins, and double-bottom passage cabins can only accommodate one person. The end face tool post can be disassembled, and all modules can be manually carried in and reassembled without large-tonnage cranes. Before procurement, measure the narrow hatch dimensions of your site and compare them with the single-module weight and outline dimensions provided by the manufacturer.
Procurement guideline standards: Steel machining generally requires a motor power of 2kW or above. Maintenance-level equipment should at least reach IT8 precision, while high-end applications require IT7 precision. It is recommended to test the equipment before purchasing to evaluate its stability and ease of operation. The XDT110's specifications list a single-side cutting depth ≥3mm, nominal roundness of 0.05mm, and Ra3.2 roughness, corresponding to maintenance-level IT8 precision. Do not equate "capable of boring" with "IT7 precision grade"; precision components require separate evaluation.
Follow the recommended layered cutting method: The 3mm single-side cutting depth for cast steel parts is the upper limit. In practice, use 2mm rough boring + 0.3—0.5mm finish boring, paired with 125r/min automatic feed, to stably achieve Ra3.2 surface roughness. Do not sign for acceptance after the manufacturer completes the entire 3mm cutting in one single pass.
Traceability of core components: Require certification for the boring bar material and chrome-plating process, the original factory traceability of the imported double-row self-aligning cylindrical roller bearings, and the number of centralized lubrication circuits.
Trial operation: It is recommended to test the equipment before purchasing to evaluate its stability and ease of operation. After delivery, perform no-load running and first-piece testing on a test block; do not sign for acceptance after only a short no-load test.
Spare parts and training: Technical training and spare parts supply are critical procurement items. Clearly specify the list of wearing parts, tool post disassembly consumables, the warranty period for chargers/electric control systems (if applicable), and the duration of operation training in the contract.
Workpiece to be repaired: Aperture (mm), span (m), surfacing layer thickness (mm), material, complete at both ends/aligned via adjacent holes __
Hard parameters: φ110 bar, 220—800mm (extendable to 1500mm __), span ≤6m, cutting depth ≥3mm, 125r/min, stroke 380mm, roundness 0.05mm, 380V
Supports: Number of auxiliary support sets for 6m span, support spacing (m), welding seam requirements __
Centering: Original factory taper sleeves, process card for alignment via adjacent holes, coaxiality via dial indicator ≤ __ mm
Disassembly: Narrow hatch dimension (mm), single module weight (kg), number of personnel for manual handling __
Trial operation: No-load running duration (min), first-piece roundness on test block (mm), rough boring (mm) + finish boring (mm), Ra __
After-sales: Traceability certificates, training duration (h), wearing parts list, spare parts response time (h)
Procurement takeaway: Do not purchase the XDT110 based on its "maximum 800mm boring capacity". Purchase it based on its "φ110 bar rigidity + auxiliary supports for ≤6m span + arbitrarily positionable spindle box + disassemblable tool post for confined space access + 0.05mm first-piece roundness". If you only verify the aperture, on-site issues like drifting roundness, span vibration, and inaccessible hatches will erase all the cost savings from the lower bare machine price.
(This article is compiled based on public corporate materials and industry information for reference only. Specific product information and service terms are subject to the official release of the enterprise.)
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