Pulley Internals
1.Product Overview
This precision rotary disc component (Pulley internals) is used as the internal structural part of pulleys. Manufactured by turning-milling composite machining supplemented by 4-axis / 5-axis CNC processing, it delivers precise forming of complex holes, slotted holes and 3D free-form surfaces. We support prototype sampling and small-to-medium batch custom production to meet high-precision assembly requirements of power transmission components.
2.Core Specifications
| Item | Specification |
|---|---|
| Structure | Disc-shaped rotary part |
| Outer Diameter | Φ99.14 mm |
| Total Thickness | Approx. 12 mm |
| Central Locating Hole | Φ10.30 mm (primary assembly reference) |
| Round Through Holes | 4 pcs Φ12.00 mm holes on PCD Φ85.00 mm |
| Special Slotted Holes | 4 sets of waist-shaped slots on outer PCD Φ99.14 mm |
| Angular Tolerance | Holes arranged at 30°, 150° with strict positional tolerance requirements |
| Surface Feature | B-Spline 3D free-form surface, not a simple flat structure |
Note: The above are reference dimensions based on drawings. Dimensions can be customized per customer drawings.
3.Product Features & Technical Advantages
1)High-precision Machining Process We adopt a mature batch production workflow: Turn-milling composite machining + 4/5-axis auxiliary machining
OP1: Complete outer circle, end face and central reference hole on turn-milling machine to build high-precision rotary datum
OP2: Use C-axis indexing / Y-axis function to mill round holes and simple slots
OP3: Transfer parts to 5-axis machining center for complex angled waist slots and 3D free-form surface finishing, ensuring accurate hole position, angular tolerance and surface profile.
2)Excellent Structural Compatibility Equipped with multiple assembly holes and special waist slots. Smooth transition of 3D curved surfaces, perfectly suited for pulley internal transmission assembly.
3)Flexible Material Selection Available materials: 6061 Aluminum Alloy, H59/H62 Brass, 304/316 Stainless Steel. Different materials meet demands of lightweight, wear resistance and corrosion resistance.
4)Support Sampling & Bulk Delivery We accept one-off prototype samples and small batch orders (50-100 pcs and above). For mass orders, setup cost can be amortized to reduce unit price.
4.Customization Options
Material grade replacement
Dimension modification (OD, hole diameter, thickness, hole angle) per drawing
Surface finishing: Anodizing (purple anodizing as shown in picture), polishing, sandblasting; surface roughness up to Ra0.8 or higher
Heat treatment: Aging, quenching & tempering, solution treatment available upon request
5.Packaging & Shipping
Each single part is wrapped with anti-static EPE foam / bubble bag to protect precision machined surfaces from scratches and impacts
Multiple pieces packed in rigid cartons with buffer filling
Express and freight shipping available for both domestic and overseas orders.
6.Information Required for Quotation
To provide an accurate quotation, please provide the following information:
Material grade: 6061 Al / H59-H62 Brass / 304-316 Stainless Steel or other materials; material cost varies greatly
Surface requirements: Surface roughness for mating surfaces (e.g. Ra0.8), polishing, anodizing or other surface treatments
Heat treatment requirement: Aging, quenching & tempering, solution treatment or not
Order quantity: Prototype / small batch (50-100 pcs) / mass production
Attachments: 2D drawing PDF or STEP model file is preferred.
7.FAQ
Q1: Can you machine parts with only 2D drawings without STEP files?
A: Yes. We can work with fully annotated 2D engineering drawings. Drawings need to clearly state dimensions, tolerances, position tolerance, angles and roughness requirements.
Q2: Can you produce the same purple anodizing finish as shown in the picture?
A: Purple color hard anodizing is available for 6061 aluminum alloy. This anodizing process is not applicable for other metals. Other surface finishes can be selected as required.
Q3: What is the lead time for samples and mass orders?
A: Normal prototype lead time: 7-15 working days. Lead time for bulk orders will be calculated separately based on part complexity. Please confirm with us during inquiry.
Q4: Can tighter tolerances be achieved?
A: Yes. We can adjust machining strategy to meet stricter tolerance for key holes, position tolerance and curved surface profile. Unit cost will change accordingly.
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