|
|
Lead Screw Formulas
|
Torque
required to drive load W using a lead screw with pitch p and
efficiency, e
|
|
Ttotal=Tfriction+Tacceleration
|
|
Tfriction=F/2ppe
|
|
F=frictional
force in ounces
P=pitch in
revs/inch
e=lead screw
efficiency
|
|
F=mW
(for horizontal surfaces)
|
|
ms=coifficient of static
friction
W=load weight
|
|
Taccel=1/g(Jload+Jlead
screw+Jmotor)w/t
|
|
W=2ppv
|
|
Jload=W/(2pr)2
|
|
Jlead
screw=(pLrR4)/2
|
|
T=Torque,
oz-in
|
|
W=angular
velocity, radians/sec
|
|
T=time,
seconds
|
|
V=linear
velocity, in/sec
|
|
L=length,
inches
|
|
R=radius,
inches
|
|
r=density,
ounces/in
|
|
G=gravity
constant 386in/sec2
|
|
|