Vending Machine Spirals

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A – Pitch of the Spiral (mm)

• This is the distance between each loop of the spiral.

• It controls how wide the space is between products.

Bigger A (pitch):

• Fewer products

• Used for large or heavy items

Smaller A (pitch):

• More products

• Used for small or thin items

B – Maximum Product Size (Diameter)

• This is the maximum width (diameter) of the product that can fit without getting stuck.

• Measure the widest part of the product (usually the bottle or can body).

⚠️ Important rule:

Your product diameter must be slightly smaller than B
(leave at least 5–10 mm clearance)

N° – Number of Products

• How many items can fit in one spiral lane.

• Smaller pitch = more products

• Larger pitch = fewer products

Ø71 – Spiral Wire Diameter

• This refers to the thickness of the spiral wire

• Ø71 means it’s fixed and standard, not something you usually change.

STEP 1: Measure Your Product

Measure in centimeters (cm) or millimeters (mm):

• Diameter (width) → for B

• Length (depth) → affects how many fit (N°)

STEP 2: Convert cm to mm

• 1 cm = 10 mm

Example:

• 6.6 cm = 66 mm

• 5.8 cm = 58 mm

STEP 3: Match Your Product to the Table

Your product width must be LESS than B mm

🥤 Example 1: Coca-Cola Can (330 ml)

Typical size:

• Diameter: 6.6 cm = 66 mm

• Height: 11.5 cm

✅ Best spiral:

• B = 74 mm

• A = 78 mm

• N° = 6

✔️ Why?

• 74 mm gives safe clearance

• 6 cans fit well

• Smooth vending, no jams

❌ Avoid:

• B = 66 mm → too tight, high jam risk

🥤 Example 2: Coke Bottle (500 ml PET)

Typical size:

• Diameter: 6.5–6.8 cm (65–68 mm)

• Height: ~21 cm

✅ Best spiral:

• B = 81 mm

• A = 87 mm

• N° = 5

✔️ Why?

• Bottles are taller and heavier

• Wider pitch prevents tipping

• Fewer bottles but safer drop

🍫 Example 3: Chocolate Bar (Snickers, KitKat)

Typical size:

• Width: 5–5.5 cm (50–55 mm)

✅ Best spiral:

• B = 51 mm

• A = 58 mm

• N° = 8

✔️ Why?

• Slim products

• Allows more stock per lane

• Efficient for high-volume snacks

🍪 Example 4: Cookies / Biscuits (Oreos, Chips Ahoy)

Typical size:

• Diameter: 7–7.2 cm (70–72 mm)

✅ Best spiral:

• B = 74 mm

• A = 78 mm

• N° = 6

🥪 Example 5: Sandwich / Bread / Boxed Food

Typical width:

• 7.5–8 cm (75–80 mm)

✅ Best spiral:

• B = 81 mm

• A = 87 mm

• N° = 5

Product TypeRecommended

SpiralCandy, gum, slim barsA=40–58 mm / B=32–51 mm

Chocolate barsA=58 mm / B=51 mm

Cookies, chipsA=71–78 mm / B=66–74 mm

Soda cansA=78 mm / B=74 mm

Plastic bottlesA=87 mm / B=81 mm

Large drinks /

boxed foodA=120 mm / B=110 mm

Spirals come in left-hand or right-hand rotation.

When to use different rotations:

• If all spirals rotate the same way → products may lean or jam

• Alternating rotation balances pressure

✅ Best practice:

• Alternate left and right spirals per lane

• Especially important for:

  • Bottles

  • Tall products

  • Heavy items

❌ Choosing spiral based only on product name
❌ Using tight B size (always leave clearance)
❌ Using small pitch for heavy bottles
❌ Same rotation direction for all spirals