Is there resistance to insertion? (10)


(I) This refers to components which can be assembled the wrong way round to the detriment of the product function, but may not be obvious to the product assemblyprocess.

© Reliance on the assembly process to achieve accurate positioning of one component relative to another with no stop encountered may cause variability.

® The part is unstable after insertion or during subsequent assembly operations and will require gripping or holding down before being secured.

(?) Part is a fastener or will act as a fastener or is provided with a built-in fastening element which is secured following insertion. Screwing operations include torque settings.

© Part can be inserted into a part assembly or work carrier by single axis straight line motion from vertically above.

(§) Insertion of the part into the assembly build nece s sitate s straight line acce ssmotion other than from the verti cally above (e.g.fromthesideor below).

© Part cannot be inserted by simple single axis straight line motion. For example, the part axis may be obstructed requiring a change in the direction of moticm.

(?) Two or more parts which are simultaneously being pi aced, fastened or inserted.

© Part initial insertion is helped by well designed chamfers or other features which ensure required alignment and positioning.

@ Considerable resistance may be encountered during part insertion due to small clearances, snagging, or insertion against a force such as a spring. ;e to components due to resistance to insertion is the key issue, e.g. pick-up, distortion and out of tolerance effects.

Figure 2.18 Fitting process risk, fp

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