This case covers a small 6061-T6 aluminum shank zero block for humanoid robot assemblies. The part is compact, but its curved bridge, top mounting holes and side hole all relate to positioning, limiting or local support. OEMach reviewed it as a functional datum part, not as a simple small milled block.
Project Snapshot
| Industry scenario | Humanoid robot components and precision CNC structural parts |
|---|---|
| Material and finish | 6061-T6 aluminum, black anodized finish |
| Critical features | Curved bridge surface, two end pads, top mounting holes, side hole and clean hole mouths |
| Manufacturing focus | Small-part fixturing, curved-surface relationship, burr control, anodized appearance and protected delivery |
Engineering Context: A Small Part With Datum Function
The shank zero block may be used near a lower-leg joint for zero-position recognition, limit control or local support. Although the cutting volume is small, the feature relationship is important. If the curved surface, top holes and side hole do not stay consistent, the part may sit unevenly or repeat poorly during assembly.
For engineering buyers, the first question is not whether the shop can machine a small block. The key question is whether the supplier understands which surfaces and holes act as the functional reference.
Machining Challenges
The center curved surface is not decorative. Tool marks, transition radius control and height difference at both end pads can affect contact, clearance or local interference. The side hole is close to the curved area, so the hole mouth has limited space for chamfering and deburring.
The top mounting holes also need stable spacing and clean edges. After black anodizing, scratches, over-chamfered bright edges or handling marks become more visible, so appearance protection has to start before surface treatment.
OEMach Manufacturing Solution
OEMach first stabilizes the bottom surface and the two end mounting pads, then machines the curved bridge and side hole against the planned datum relationship. For this type of small component, loading more pieces in one setup is less important than even clamping force and repeatable support.
The curved surface is machined with a smooth tool path to reduce vibration marks on the bridge. Side-hole deburring is controlled carefully so burrs are removed without enlarging the chamfer or damaging the black finish. The part is checked before anodizing and rechecked after anodizing for hole-mouth condition, curved-surface finish and color consistency.
Inspection Focus
First-article inspection should cover top-hole position, side-hole condition, curved profile, two pad heights, bottom flatness, chamfers and black anodized appearance. For a small datum part, the relationship between the curved surface and holes is often more meaningful than a single outside dimension.
During small-batch production, OEMach monitors small-tool wear, side-hole burrs, anodized hole edges and residual particles inside the holes. Before packaging, the curved surface is visually checked to avoid scratches or pressure marks.
Lead Time and Small-Batch Handoff
For a 6061-T6 black anodized shank zero block like this, prototype sampling is usually evaluated around 5 to 7 working days. Small batches are commonly planned around 7 to 12 working days, depending on inspection records, anodizing schedule and packaging requirements.
The part can move quickly into validation, but the process should not skip first-article confirmation, anodizing review or packaging planning. The goal is to deliver parts that the customer can use for assembly testing with less rework.
Delivery Takeaway
This case shows that small robot datum parts require the same process discipline as larger structural parts. Speed matters, but stable feature relationships, controlled burrs, clean black anodizing and protected transport are what make the parts useful at the customer side.
FAQ
Why does the curved surface matter on a shank zero block?
It may provide contact, clearance or limit control. Poor curved-surface quality can affect fit and repeat positioning.
What is difficult about the side hole?
The side hole is close to the curved bridge, leaving limited space for chamfering and deburring without damaging nearby surfaces.
Can prototype parts be inspected only by sampling?
For the first article, the key holes and curved datum should be fully reviewed. Sampling can then be adjusted according to batch risk.
Ready to get a quote for your CNC machined parts?
Submit your engineering drawings to qiancj@oemach.com. We support prototype sampling and small-batch production with strict tolerance control.