Sliding mechanisms

Question 1

What are the 4 different types of sliding mechanisms?

Answer 1

[Picture5]

> Carriage slide

> Linear slide

> Drawer slide using ball bearings

> Complete carriage slide with lead screw

Question 2

What are the shapes of slides?

Answer 2

> Longer than they are wide

> A ratio of at least 1.6:1 to prevent snagging (Length:Width)

Question 3

What is snagging?

Answer 3

this occurs when the force is off centre from the slide and can cause the slide to rotate and snag

Question 4

What is the equation for the Y axis for this situation? [Picture 6]

Answer 4

∑F_y = 0 = F_B1 + (-F_B2) ⇒ F_B1 = F_B2 = F_B

Question 5

What is the equation for the X axis for this situation? [Picture 6]

Answer 5

∑F_x = (-μF_B2 ) + (-μF_B1 ) + (-μW) + F_pull = 0

F_pull = μW + 2μF_B

Question 6

What is the equation for the moments about the centre of mass for this situation? [Picture 6]

Answer 6

∑M_@CofG = 0 = F_pull×c + μF_B1×a - F_B1×b - μF_B2×a - F_B2×b

F_pull = (2F_B×b) / c

Question 7

What is the specification for ACME trapezoidal thread?

Answer 7

[Picture7]

Question 8

What is the specification for Trapezoidal metric thread?

Answer 8

[Picture8]

Question 9

What is the ISO standard nomenclature for the trapezoidal metric thread?

Answer 9

> T,12 x 3

> T = Trapezoidal thread

> 12 = Diameter of 12mm

> 3 = Travel a distance of 3mm for one rotation of the lead screw

> A matching nut must match the thread pitch and diameter