Tol-O-Matic System Compatibility - Industrial and Bearing Supplies

Symbols:
e = lead screw or belt
efficiency
e′ = reduction efficiency
F T = total friction force (lbs.)
F EXT. = force to do external work (lbs.)
J LOAD = load inertia (oz.-in. 2 )
J LS = lead screw inertia (oz.-in. 2 )
J MOTOR = motor inertia (oz.-in. 2 )
J RD = reduction device inertia (oz.-in. 2 )
J WHEELS = bolt drive & idler wheel inertia (oz.-in. 2 )
Ø = angle of load from horizontal (degrees)
input motor rpm
m = reduction ratio = =
output screw shaft rpm
p = pitch of screw (rev./in.)
r = radius of belt drive wheel (in.)
t a = acceleration time (sec.)
T ACC = required torque to accelerate the load (oz.-in.)
T BREAKAWAY = breakaway torque (oz.-in.)
T EXT. = required torque to overcome external force (oz.-in.)
T FRICTION = required torque to overcome friction (oz.-in.)
T GRAVITY = required torque to overcome gravity (oz.-in.)
T MOTOR = motor output torque at desired speed (oz.-in.)
T PRELOAD = torque required to overcome loading of carrier
bearings and tension on screw or belt
T TOTAL = required torque to move the load (oz.-in.)
µ = coefficient of static friction linear bearing system
V M = maximum linear velocity (in./sec.)
ω = angular velocity (rad./sec.)
W OTHER = weight of carriage or weight of top axis (lbs.)
W LOAD = weight of load (lbs.)
SCREW EFFICIENCY (e)
FORM Single Nut A/L Nut*
Acme 0.60 0.50
Ball 0.90 0.85
*A is Antibacklash Acme, L is Low Backlash Ball
ENGINEERING RESOURCES
147