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書名： Essentials of Mechanical Engineering Design, 1/E 作者：Shigey Mischke Budynas 書號：MX0398. Ball screw. High Speed Ballscrews. Cool Type Ⅰ 超高 Dm-N 值滾珠螺桿. Rising the load Lowering the load From eqs. (a) From eqs. (b). T L is positive when For the case of no friction - PowerPoint PPT Presentation
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書名： Essentials of Mechanical Engineering Design, 1/E作者： Shigey Mischke Budynas書號： MX0398
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75.112M
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Ball screw
High Speed Ballscrews Cool Type Ⅰ 超高 Dm-N 值滾珠螺桿
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Rising the load
Lowering the load
From eqs. (a)
From eqs. (b)
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TL is positive when
For the case of no friction
Mechanical eff.
As shown in
Fig. 5.7
Friction of collart
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Shear stress
Normal stress
J.B. Johnson equation for short column
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Bearing stress
Bending stress
Shear stress
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(prefer number)
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ofor 30
Member has same
Material
km=k/2 and l=2t
Dw=1,5d
A,B see table 5-8
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P=Pm+Pb
preload
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ddddisdiametercollarmean c 25.12/)5.1(
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(Table 5-15)
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Stress in a bolt
n=load factor
Sp=proof load
P0=load which will make the joint separation (Fm=0)
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Pitch is 1/11in for 8/8 bolt
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Bolt spacing around the bolt circle
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Goodman:
Gerber
ASME elliptic
Goodman
Gerber
ASME
Factor of safety
Goodman eq.5-34, 5-40
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C=0, Fi=0
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