•  Metal
•  Plastic
•  Wood
•  Urethane
•  Natural rubber
•  Corrugated cardboard
•  Other material

2 – Product weight: What will be the maximum weight?

3 – Available voltage: What voltage are you using?

• 24VDC
• 3 phase 230VAC @ 60Hz
• 1 phase 115VAC @ 60Hz
• Other Voltages

4 – Desired transportation speed: How fast do you want to move the article?

• Feet/minute (FPM)

5 – Diameter of the roller: What diameter are you looking for?
Common Itoh Roller Diameters

• 1.50” (38.0mm)
• 1.68” (42.7mm)
• 1.91” (48.6mm)
• 2.25” (57.0mm)
• 2.38” (60.5mm)
• 2.50” (63.5mm)
• 3.00” (76.3mm)

(Convert English units to Metric units, 1 inch=25.4 mm)

6 – Between frame dimension: What is your between frame dimension (BF)?

• In determining the correct length of the Power Moller required, you should first obtain the between the frame width of the conveyor you will be mounting the Power Moller in.
  • All dimensions need to be converted to millimetres.
• Take the between the frame width and subtract 15mm to account for bearing end caps and clearances to achieve proper tube length.
  • Subtract 21mm when using the “JQ” type shafts.
  • For the PM635FS the deduction will be 20mm
  • For PM763BS deduct 30mm
  • For IP-G and HP-G rollers, deduct 35mm.

7 – Options: Does the application call for any special options?

• Lagging (Natural Rubber, NBR, Neoprene, Urethane)
• Dust-proof
• Waterproof
• Brake
• Clutch
• Other
• KF – Brackets not ordered with roller

Important Formulas:
Tangential Force (TF)

•  Tangential force is the force in lbs. that is needed to move the item on the conveyor.
  • The force tangent to the roller’s surface.
  • Tangential force F can be found by the following formula:

Formula 1
TF = µ X W
TF = Required tangential force
W= Weight of article to be transferred
µ = Coefficient of rolling friction in accordance with the material composition
of the bottom of the article to be transferred. (See Table I)

• To determine the number of POWER MOLLER units required for transfer, compare required tangential force (F) and the tangential force of one POWER MOLLER unit (f)

Formula 2
Number of POWER MOLLERS required = F/f

The above values are based on industry standards of products with a smooth, uniform bottom surface in contact with the roller.

Example

• Material:      Cardboard
• Weight:         25 lbs.
• Voltage:       3Phase, 230VAC @ 60Hz
• Speed:          85 FPM
• Diameter:   2.25”
• BF:                 24”
• Options:      None

A – Tangential force required (Formula 1)

Given W = 25 lbs.
Cardboard coefficient u = 0.11
TF = u X W
TF = 0.11 X 25 lbs.

TF = 2.75 lbs. required to move the article
PM570AS-20 TF – 5.4 lbs. > 2.75 lbs. ((Refer to catalog page for chosen roller to obtain performance data)

B – Match/Best fit the diameter

• Diameter given 2.25” (57.0 mm)
• Model: PM570

C – Given AC motor type

• Model number/motor type reflects AC or DC
• PM570AS 

D – Select the best speed for the customer

• Speed code is an approximate meter-per-minute figure
  • Varies by model
  • Reference FPM values
  • See speed table for PM570AS, (Refer to catalog page for chosen roller to obtain speed codes)
• Given 85 FPM, Speed code -20 offers 89.6 FPM

Model number with speed code:    PM570AS-20

E – Maximum Load Limit

• • See maximum static load limit table, page 60
  • PM570 series
  • 500 – 600 mm tube length
  • Maximum load limit of 176 lbs. per roller
  • 25 lbs. load < 176 lbs. limit – Okay

F – Select the correct voltage
PM570AS is an AC motor type

• Available voltage is 3 phase, 230VAC @ 60Hz
• Model number with voltage – PM570AS-20-595-3-230 

G – Options

• No options given

Final model number:    PM570AS-20-595-3-230

Description

• • 2.25” Diameter
  • Standard AC motor type
  • 90.1 FPM
  • 595 mm Tube Length
  • 3 230 VAC @ 60 Hz
  • No Options