Precision Granite Base Plate with Integrated Guide Rail
Most flat granite plates are just that — flat. This one carries an added feature along one long edge: a raised rail, machined as a continuous ridge running the full length of the plate, standing proud of the main working surface by a consistent, ground height. It isn't a bolt-on addition. Looking at the piece, the rail reads as an integral part of the same stone block, ground and finished in the same operation as the flat top surface, which is exactly why it holds its geometric relationship to that surface as reliably as it does.
The main plate face carries a fine, even polish — the kind of dark, low-glare black granite finish that shows almost no visible grain irregularity under close inspection, a reasonably reliable visual indicator of dense, well-selected stone. Edges along the plate perimeter are sharp and square, cut clean rather than chamfered, consistent with a component meant to serve as a dimensional reference rather than a purely cosmetic or structural piece. The raised rail sits set back slightly from the plate edge, with its own machined vertical face and a flat top land, suggesting it's intended to function as either a mounting datum for a linear guide system, an alignment fence for positioning parts or fixtures against, or a stiffening rib that adds section height along one axis without increasing the overall plate thickness across the whole working area.
Overall proportions in the piece read as a moderately thick slab — thick enough to resist deflection under its own working load, but clearly optimized rather than solid mass for its own sake, consistent with how granite machine bases are typically sized once a customer's load and span requirements are known.
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Model |
Details |
Model |
Details |
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Size |
Custom |
Application |
CNC, Laser, CMM... |
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Condition |
New |
After-sales Service |
Online supports, Onsite supports |
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Origin |
Jinan City |
Material |
Black Granite |
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Color |
Black / Grade 1 |
Brand |
ZHHIMG |
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Precision |
0.001mm |
Weight |
≈3.05g/cm3 |
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Standard |
DIN/ GB/ JIS... |
Warranty |
1year |
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Packing |
Export Plywood CASE |
After Warranty Service |
Video technical support, Online support, Spare parts, Field mai |
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Payment |
T/T, L/C... |
Certificates |
Inspection Reports/ Quality Certificate |
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Keyword |
Granite Machine Base; Granite Mechanical Components; Granite Machine Parts; Precision Granite |
Certification |
CE, GS, ISO, SGS, TUV... |
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Delivery |
EXW; FOB; CIF; CFR; DDU; CPT... |
Drawings’ format |
CAD; STEP; PDF... |
- • Single-piece dimensional integrity. Because the rail and main working surface are ground from the same stone block, their geometric relationship doesn't depend on a secondary mounting or bonding step that could introduce misalignment over time.
- • No corrosion, no magnetic interference. Granite doesn't rust in humid shop conditions and won't disturb magnetic scales or sensors mounted nearby, an advantage steel base plates and rails can't offer.
- • Long-term flatness retention. Granite lacks the internal residual stress that machined or cast metal structures can carry, reducing the risk of slow warping that eventually throws off both the working surface and the rail alignment relative to it.
- • Vibration damping. Granite's natural crystalline structure absorbs floor-transmitted vibration more effectively than steel, which matters directly for any linear motion or inspection system mounted on top.
- • Traceable verification. Both the main surface flatness and the rail's parallelism to it are checked with calibrated laser interferometry and electronic levels, with certification traceable to a recognized metrology institute.
We use various techniques during this process:
● Optical measurements with autocollimators
● Laser interferometers and laser trackers
● Electronic inclination levels (precision spirit levels)
1. Documents together with products: Inspection reports + Calibration reports(measuring devices) + Quality Certificate + Invoice + Packing List + Contract + Bill of Lading(or AWB).
2. Special Export Plywood Case: Export fumigation-free wooden box.
3. Delivery:
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Ship |
Qingdao port |
Shenzhen port |
TianJin port |
Shanghai port |
... |
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Train |
XiAn Station |
Zhengzhou Station |
Qingdao |
... |
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Air |
Qingdao Airport |
Beijing Airport |
Shanghai Airport |
Guangzhou |
... |
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Express |
DHL |
TNT |
Fedex |
UPS |
... |
Is the guide rail a separate piece bonded to the plate, or part of the same stone? It's machined from the same granite block as the main plate — there's no bond line or mechanical joint between the rail and the working surface, which is what preserves their geometric relationship over time.
Can the rail height, width, or position be customized? Yes. Rail geometry is configured based on what will be mounted to it, whether that's a specific linear guide profile, a fixture locating edge, or a stiffening feature, so this is specified per project rather than offered as a fixed catalog option.
What tolerance can be held between the rail face and the main plate surface? This depends on the grade specified and the intended application; tighter tolerance is achievable but adds to lead time and cost, so it's worth confirming the actual functional requirement rather than defaulting to the tightest available spec.
How is flatness and parallelism verified before shipment? Both the main surface and the rail are measured using laser interferometry and precision electronic levels, calibrated and traceable to a recognized metrology institute, with a certificate included at shipment.
What's the typical lead time for a custom configuration like this? Lead time depends on overall size, grade, and rail complexity; single-piece designs with integrated features generally take longer than a flat plate alone, since the rail geometry has to be established during rough machining before final grinding and lapping begin.
Request a Quote
If you're specifying a granite base plate with an integrated mounting rail or alignment edge for a machine tool, linear motion system, or inspection fixture, send us your load requirements, overall dimensions, and the rail geometry you need, and our engineering team will confirm feasibility, tolerance grade, and lead time. Reach out through the inquiry form on this page, or contact ZHHIMG's sales engineering team directly to discuss your specific configuration.
QUALITY CONTROL
If you can’t measure something, you can’t understand it!
If you can’t understand it.you cant control it!
If you can’t control it, you can’t improve it!
More information please click here: ZHONGHUI QC
ZhongHui IM, your partner of metrology, help you succeed easily.
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ISO 9001, ISO45001, ISO14001, CE, AAA Integrity Certificate， AAA-level enterprise credit certificate…
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More certificates please click here: Innovation & Technologies – ZHONGHUI INTELLIGENT MANUFACTURING (JINAN) GROUP CO., LTD (zhhimg.com)
