Element

Observed time $($min$)$

$0\mathrm{.}35$

$0\mathrm{.}60$

$0\mathrm{.}86$

$6$ The readings in the table below were taken by the snapback timing method of direct time study to produce a certain subassembly. The task was performance rated at $85\%.$ In addition to the above regular elements, an irregular element must be included in the standard each rack holds $20$ mechanism plates and has move the rack $($which now holds the subcompleting $20$ subassemblies, the operato a mew empty rack into position at the workstation. assemblies$)$ to the aisle and then move $2\mathrm{.}90$min and the operator was performance rated at This irregular element was timed at $20$ mine $($a$)$ the normalized time for the cycle, $($b$)$ the $80\%.$ The PFD allowance is $15\%$ per of parts produced by the operator, if he or she works at standard time, and $($c$)$ the num tof $6hr$ and $57$min during the shift.

Element and Description

Pick up mechanism plate from rack and place in fixture.

Assemble motor and fasteners to front side of plate.

$0\mathrm{.}42$

$0\mathrm{.}28$

Move to other side of plate.

$0\mathrm{.}11$

$0\mathrm{.}56$

$0\mathrm{.}33$

Assemble two brackets to plate.

$0\mathrm{.}40$

Assemble hub mechanism to brackets.

Remove plate from fixture and place in rack.

nalues in the table below were obtained ask. All elements manual repetitive n irregular ele$-$