Tender Coconut Water Extraction and Dispensing Machine

Street vendors and small juice shops sell tender coconut water by hacking each nut open with a machete — quick in practiced hands, but tiring across a hundred nuts a day, wasteful when the cut misses the soft eye, and risky when a blade slips. The problem is mechanical, not culinary: the nut must be held firmly without cracking the shell, the soft eye needs a controlled piercing force, and the water must land somewhere clean instead of on the counter. This project builds a tabletop machine that does all three. An adjustable V-clamp fixture grips tender coconuts from 200 to 900 g (expected range); a long lever drives a food-grade SS304 conical punch through the soft eye at approximately 4:1 mechanical advantage (design target); the water drains through an SS funnel into a 2 L vessel and is served through a dispensing tap. Fully manual — no motor, no wiring — the build is a compact study in machine design, lever linkages and food-contact material selection.

1. Place the tender coconut in the V-clamp fixture and tighten the hand screw until the shell is firm and the soft eye sits directly under the punch.
2. Pull the lever down; the linkage drives the SS304 conical punch through the soft eye at approximately 4:1 mechanical advantage (design target).
3. Water flows out around the punch and drains through the SS funnel into the 2 L food-grade collection vessel below.
4. Return the lever to its rest position; the punch withdraws and a return spring holds the slide up, clear of the work area.
5. Open the dispensing tap to serve the collected water into glasses — each nut yields approximately 250–350 mL (expected).
6. Loosen the hand screw, lift out the spent shell and load the next coconut; changeover takes a few seconds (expected).

Tech stack:

• 25 × 25 mm MS square tube · arc-welded frame
• SS304 food-grade punch, funnel & vessel
• Lever linkage · approx. 4:1 ratio (design target)
• V-clamp fixture with hand screw
• Lathe, drilling & grinding (punch machining)
• 2D CAD fabrication drawings

• [Lever-operated SS304 punch] The long lever drives a food-grade SS304 conical punch through the coconut's soft eye at approximately 4:1 mechanical advantage (design target), so the hand force needed stays small.
• [Adjustable V-clamp fixture] A sliding V-block clamp with a hand screw grips tender coconuts from 200 to 900 g (expected range) firmly without cracking the shell, and centers the soft eye under the punch.
• [Food-grade collection path] Pierced water drains through an SS304 funnel into a 2 L (design target) food-grade stainless vessel — no plastic touches the water path in the base build.
• [Dispensing tap] A food-grade chrome-plated brass tap on the vessel serves water straight into glasses, so the vendor never pours from an open container.
• [Stable welded frame] A 25 × 25 mm MS square-tube welded frame (design) with rubber feet and bolted joints keeps the machine planted through the lever stroke.
• [Fast coconut changeover] One hand screw releases the spent shell; the next coconut drops in and clamps in seconds (expected).
• [Top-trimming blade attachment] A bolt-on SS blade ring that shaves the coconut's crown flat before punching. Optional customization — quoted separately, not part of the base build.
• [Vendor name panel] The front frame panel accepts a printed name board for the vendor's branding. Configurable at order time.

• Working tabletop machine: frame, V-clamp, lever-punch assembly, funnel, vessel and tap
• 2D CAD fabrication and assembly drawings
• Bill of materials with material grades (MS tube, SS304 parts, fasteners)
• Food-contact cleaning and sanitation procedure
• Operation manual: setup, piercing, serving and daily maintenance
• Project report PDF with design calculations (lever ratio, punch force estimate, frame sizing)
• PPT presentation for final review
• Viva Q&A document (machine design, linkages, food-grade materials)
• Touch-up paint and spare fastener kit