Product: Life Fitness Optima Series Adjustable Bench

Assembly Exploded View

This adjustable bench is a very useful tool in most gymnasiums. It is multifunctional in the sense that can be used to perform a variety of exercises, including bench press, dumbbell press, and Bulgarian squats.

Part 5: Rail

Assign and Control Datums

• The base of the rail sits in the center of the foundation beam with respect to its width, so we will use this to define our primary datum. The two side surfaces offer a large surface area which is ideal for stable datum A.

  The A datum restricts translation along the width of the part, and its form is controlled by a flatness tolerance.

• The height of the rail affects the ability of the bench to set different weights, due to the interfacing of the link. So, we use this to define our secondary datum, and set datum B on the height of the rail, perpendicular to datum A. Datum B restricts translation along the length of the part.

• A and B datums together restrict all rotational degrees of freedom

• Our tertiary datum C will be used to constrain our last degree of freedom, which is translation along the height of the part. We apply this to the profile of one the set teeth for the part, since this feature is

  important for a particular height setting on the bench to be stable, due to the interfacing of the link system. Datum C is controlled with a profile tolerance referencing both A and B.

  
  

  Apply geometric tolerances

• Interaction with the rail system

  
  

  • We will apply a flatness tolerance to the sides to ensure that the part does not stick out and obstruct the link system, since the links need to move smoothly between different height settings.

  • We apply a size tolerance since we also have a datum here.

• Interaction with the foundation beam

  • To both make sure that we have a strong weld at the base, and make sure that the top of the rail does not obstruct the link system, we apply a perpendicularity (to A) tolerance to the height of the rail.

• Interaction with link system

  • The teeth of the rail interact with the center cylinder of the link system, so to ensure that this interaction is stable, we apply a profile tolerance.

  • We will apply a flatness tolerance here to ensure an effective weld between the mid hinge and the base of the frame.

  • The datum is applied to both sides since there are links on both sides.

• The rest of the surfaces are controlled by the general profile of a surface tolerance, which references all three datums.

  Part6 – Seat 1

  
  

  
  

  Assign and Control Datums

• The seat is welded at the bottom to a base that is the same size of the seat, we will use this for our primary datum since it is a large surface area as well. The primary datum A constraints translation along the height of the seat, as well as two rotational degrees of freedom. Form is controlled by a flatness tolerance.

  
  

• The back of the seat mates with the hinge cylinder through a weld, so we use this to define our secondary datum B. It restricts motion along the length of the part, as well as the last rotational degree of freedom.

• The tertiary datum C is applied to the width of the part restrict the last translational degree of freedom, along the width. This is a good choice sue to the large surface area of the sides of the seat. The datum is controlled with a position tolerance referencing both A and B.

  Apply geometric tolerances

• Interaction with the base plate

  • We apply a flatness tolerance at the bottom of the seat, to ensure a strong weld with the base of the seat.

  • We apply a profile tolerance to the front of the seat since the fillet interacts with the base plate. This is done to ensure a strong weld.

• Interaction with the user

  • The user needs a flat top surface to ensure maximum comfort. This is accomplished by setting a parallel tolerance to datum A at the top of the part.

• Interaction with the hinge cylinder

  • The back of the seat mates with the hinge cylinder through a weld. To ensure a strong weld, we apply a perpendicular tolerance (to datum A) at the back of the seat.

• Interaction with the beam

  • We apply a position tolerance to ensure that the seat is on the center of the beam.

• The rest of the surfaces are controlled by the general profile of a surface tolerance, which references all three datums.

  Part 19 – Seat 2 back head rest

  
  

  assign a secondary datum B. It is a good choice since the part has a large surface area on the sides.

• We add a tertiary datum C to constrain the translation along the length of the part, which is the last degree of freedom. The datum is controlled perpendicular to A.

• A and B together constrain all the rotational degrees of freedom. Apply geometric tolerances

• Interaction with the frame

  • We apply a flatness tolerance at the bottom of the seat, to ensure a strong weld with the frame.

  • We apply a bilateral tolerance to the length of the part since datum C is defined here.

• Interaction with the user

  • The user needs a flat top surface to ensure maximum comfort. This is accomplished by setting a parallel tolerance to datum A at the top of the part.

• Unnecessary protrusions/aesthetics

  • We apply a flatness and perpendicular tolerance to the sides of the part to ensure a smooth finish.

• The rest of the surfaces are controlled by the general profile of a surface tolerance, which references all three datums.

  Part 18 – Seat 3 lower back rest

  
  

  assign a secondary datum B. It is a good choice since the part has a large surface area on the sides. We control this datum perpendicular to A.

• A and B together restrict all the rotational degrees of freedom and two translational degrees of freedom.

• We define datum C to restrict the last translational degree of freedom. A bilateral tolerance is applied to the width of the part for this reason. Datum C is controlled perpendicular to A and B.

  Apply geometric tolerances

• Interaction with the frame

  • We apply a flatness tolerance at the bottom of the seat, to ensure a strong weld with the frame.

• Possible Interaction with lower back rest

  • To prevent protrusions and possible interactions with the lower back seat, we apply a

• Interaction with the user

  • The user needs a flat top surface to ensure maximum comfort. This is accomplished by setting a profile tolerance that references all the datums.

• Unnecessary protrusions/aesthetics

  • We apply a flatness and perpendicular tolerance to the sides of the part to ensure a smooth finish.

• The rest of the surfaces are controlled by the general profile of a surface tolerance, which references all three datums.

  Part 20 – Top frame main

  
  

  
  

  Assign and Control Datums

• The seat is welded at the bottom to the frame, we will use this beam surface for our primary datum since it is a large surface area as well. The primary datum A constraints one degree of translation, as well as two

  rotational degrees of freedom. Form is controlled by a flatness tolerance.

• Secondary datum B ensures that the frame interfaces the link system at its center to ensure max stability. It constrains the last rotational degree of freedom as well as translation along the width of the part. A bilateral tolerance is applied to the width of the part for this reason. Datum B is controlled perpendicular to A.

• A and B together restrict all the rotational degrees of freedom and two translational degrees of freedom.

• We define tertiary datum C to restrict the last translational degree of freedom. It is controlled with a profile tolerance referencing datums A and B.

  Apply geometric tolerances

• Interaction with the seat

  • We apply a flatness tolerance at the surface of the beam, to ensure a strong weld with the seat.

  • Both sides are welded to different parts, so we apply to both the surfaces.

• Interaction with the hinge

  • The bottom surface of the frame is welded to the hinge. We apply a profile tolerance to this surface to ensure a strong weld. A profile tolerance is applied since the surface is inclined, and not flat.

• The rest of the surfaces are controlled by the general profile of a surface tolerance, which references all three datums.

  
  

  Part 8 – foundation beam base

  
  

  
  

  Assign and Control Datums

• The beam is welded to another beam at the front, we will use this beam surface for our primary datum since it is a large surface area as well. The primary datum A constraints one degree of translation, as well as two rotational degrees of freedom. Form is controlled by a flatness tolerance.

• Secondary datum B ensures that the beam interfaces with the other beam at its center. It constrains the last rotational degree of freedom as well as translation along the width of the part. A bilateral tolerance is

  applied to the width of the part for this reason. Datum B is controlled perpendicular to A.

• A and B together restrict all the rotational degrees of freedom and two translational degrees of freedom.

• We define tertiary datum C to restrict the last translational degree of freedom. It is controlled with a profile tolerance referencing datums A and B.

  Apply geometric tolerances

• Interaction with the grips

  • We define a profile tolerance here to ensure that we have a strong weld to the beam.

• Interaction with the other beam

  • The flatness tolerance ensures that we can get a strong weld between these parts.

• The rest of the surfaces are controlled by the general profile of a surface tolerance, which references all three datums.

  Part 16 - Adjuster link

  
  

  
  

  Assign and Control Datums

• The link must not obstruct the cylinder in between. We will use this beam surface for our primary datum since it is a large surface area as well. The primary datum A constraints one degree of translation, as well as two rotational degrees of freedom. Form is controlled by a flatness tolerance.

• For the adjuster cylinder to fit correctly inside the link, we define a secondary datum B for the two holes. It constrains the last rotational degree of freedom as well as translation along the width of the part. A bilateral tolerance is applied to the width of the part for this reason. Datum B is controlled perpendicular to A.

• A and B together restrict all the rotational degrees of freedom and two translational degrees of freedom.

• We define tertiary datum C to restrict the last translational degree of freedom. It is controlled perpendicular to datum A. A bilateral tolerance is defined at the width for this reason.

  Apply geometric tolerances

• Interaction with the adjuster cylinder

  • We apply a position control for the two holes that mate with the two cylinders, at the max material condition since the cylinders need to fit inside the holes.

• Interaction with the handle

  • We apply another position control here at the maximum material condition to ensure that the handle fits inside the hole that is defined for it.

• The rest of the surfaces are controlled by the general profile of a surface tolerance, which references all three datums.

  Part 3 – Front foot to body

  
  

  
  

  Assign and Control Datums

• The part must be positioned correctly to weld with the frame. We will use this for our primary datum since it is a large surface area as well. The primary datum A constraints one degree of translation, as well as two rotational degrees of freedom. Form is controlled by a flatness tolerance.

• Secondary datum B ensures that the part interfaces properly with the bottom cylinder. It constrains the last rotational degree of freedom as well as a translational degree of freedom. Datum B is controlled with a profile tolerance.

• A and B together restrict all the rotational degrees of freedom and two translational degrees of freedom.

• We define tertiary datum C to restrict the last translational degree of freedom, along the height of the part. It is controlled perpendicular to datum A.

  
  

  Apply geometric tolerances

• Interaction with the beam

  • To ensure a strong weld, we define a flatness tolerance at the flat surface where the part mates with the beam.

  • At the sides of the mating surface, we define a profile tolerance referencing A, since the surface is curved.

• Interaction with the cylinder

  • We define a profile tolerance here to ensure a strong weld between the part and the cylinder.

• The rest of the surfaces are controlled by the general profile of a surface tolerance, which references all three datums.