Pulleys for Flat Belts (Width L=25 ~ 100) - Crowned, Crosspiece Groove Straight
:
MISUMI
· The Pulleys for Flat Belts ROBAC, ROBACF, and ROBAM types are specific pulleys manufactured by MISUMI.
· Shaft of Pulleys : Crowned and Crosspiece Groove Straight type.
· The series code of Crowned type: ROBAC, ROBACF.
· The series code of Crosspiece Groove type: ROBAM.
· Shaft Type : Round Hole.
· Pulleys Body Material: Aluminum Alloy.
· Surface Treatment solution: Clear Anodize
· Outer Diameter: 15-80 mm.
· Shaft (Bore) Diameter: 8-35 mm.
· Length: 25-100 mm.
· Idlers for Flat Belts (Width L25-100) -Straight Type/Crosspiece Groove Straight Type/Crowned Type
Crowned
ROBAC (No Flange) Crosspiece Groove Straight
ROBAM (No Flange) ■Keyway Machining Shape ROBACF (Flanged) Crosspiece Groove Part
[ ! ] Unless otherwise specified, the dimension tolerance conforms to JIS B 0405 Class m.ROBAC (No Flange) Crosspiece Groove Straight
ROBAM (No Flange) ■Keyway Machining Shape ROBACF (Flanged) Crosspiece Groove Part
| Type | Material | Surface Treatment | ||
| Crowned (No Flange) | Crowned (Flanged) | Crosspiece Groove Straight | ||
| ROBAC | ROBACF | ROBAM | Aluminum Alloy | Clear Anodize |
| ROBMC | ROBMCF | ROBMM | S45C | Electroless Nickel Plating |
| ROBSC | — | ROBSM | SUS304 | — |
Crosspiece Groove Part
■New JIS (B1301) Keyway Dimensions
| Nominal | dH7 | bJS9 | t Tolerance | |||
| N8 | 8 | +0.015 0 | 3 | ±0.0125 | 1.4 | +0.1 0 |
| N10 | 10 | |||||
| NK10 | 10 | 4 | ±0.0150 | 1.8 | ||
| N12 | 12 | +0.018 0 | ||||
| N15 | 15 | 5 | 2.3 | |||
| N20 | 20 | +0.021 0 | 6 | 2.8 | ||
| N25 | 25 | 8 | ±0.0180 | 3.3 | +0.2 0 | |
| N30 | 30 | |||||
key length is shorter under the following conditions
in order to avoid causing interference with
through holes made by keyway machining
.
When L/2 - X/2 ≤ K ≤ L/2 + X/2,
K = L/2 - (X/2 + (b + 1)/2 + 1)
[ ! ]X ≥ Y
[!] For Crosspiece Groove Part Dimensions, see "Pulley, Idler Relief Dimensions".
[!] Set screws are not included.