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Design Data Force and TorqueRequirements Definitions Force and Thrust Requirements Fh=Force required to power slide horizontally (lbs.)Fv=Force required to power slide vertically (lbs.) Fwh=Force required to power saddle weight horizontally (lbs.)Fwv=Force required to power saddle weight vertically (lbs.)Ff=Force required to overcome applied loads (lbs.)F=Applied external load (see force direction in Load Cases on page 28)d=Perpendicular distance from saddle to applied load (inches)Fh=Applied load perpendicular and into plane of saddle top (lbs.) (see drawing to left)Fv=Applied load perpendicular and away from planeof saddle top (lbs.) (see drawing to left)Fs=Applied load perpendicular and into or away fromplane of saddle side (lbs.) (see drawing to left).F The force required to power the slide includes theforce required to move the saddle plus the force
required to overcome all external loads, multiplied
by a factor of safety depending on the type of
drive used.The factor of safety is applied to
assure sufficient power to accelerate the load. FhThFvTv
FhFsFsFv MX =Force required to overcome moment Mx and load F (lbs.)F Force Calculations: MY =Force required to overcome moment M Y and load F (lbs.)F Fh=(Fwh + Ff + F MX + F MY + F MZ ) fsFv=(Fwv + Ff + F MZ =Force required to overcome moment Mz and load F (lbs.)M=Applied external moment (inch-lbs)M MX + F MY + F MZ ) fsFwh= µ µ (WSL) (SL)Fwv=(WSL) (SL)
Ff= (Fh + Fv + Fs)F X =Moment about saddle width (inch-lbs)M Y =Moment about plane of saddle top (inch-lbs)M Z =Moment about saddle length (inch-lbs)fs=Factor of safety:• Manual drives = 1.5• Feedscrew drives = 2
• Industrial hydraulic cylinder drives= 2.5. MX =2 µ (Mx/SW) + µ (F)F Diameter(mm) MY =3 µ (M Y /SL) + FF MZ =3 µ (Mz/SL) + F µ =Coefficient of friction (see page 28)WSL=Unit weight of saddle (lbs./in.)
SL=Saddle length (inches)
SW=Saddle width (inches)
Th=Torque required to power slide horizontally (inch-lbs.)Tv=Torque required to power slide vertically (inch-lbs.)L=Lead of screw (inches/rev.)
k=Screw constant• Acme screw = 0.5• Ballscrew = 0.2 Torque Calculations: Th=(Fh) (L) (k)Tv=(Fv) (L) (k) Dynamic(lbs.) Static(lbs.) All forces, loads, and moments must be added using correct sign positive or negative. Thrust Capacities Ballscrew Thrust Capacity MODEL The maximum thrust capacity for the various ballscrew drivepackages is shown in the following chart.For proper selection
of slide sizing and saddle lengths, the thrust capacity of the
drive package being considered must be compared to the
load capacity (Mz) of the slide.(See page 28.) Notes: 1.The chart values are based on the mechanical thrustlimitations of the drive package.2.For extremely long travels consult SETCO Proposal Engineering for limitations due to column loading.3.For static applications, consult SETCO Proposal Engineering forlimitations due to saddle locking device and/or back-driving force. 16 25 40 40 63 63 63
HS 7___FGMHS 9___FGM
HS 12___FGM
HS 15___FGM
HS 18___FGM
HS 24___FGM
HS 32___FGM 1550 1360 4730 4730 9480 9480 9480 12,279 11,780 37,110 37,110 78,530 78,530 78,530 27
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