X̄-R Chart — Bottle Fill Volume
Twenty-two subgroups of four bottles from a rotary filler, with X̄ and R limits from A2/D3/D4 and Cp/Cpk/Pp/Ppk against a 495–505 ml specification; a late head adjustment shows up as rule 1, 5 and 6 signals.
Make it your own.
title "Fill volume — line 3 rotary filler"
chart xbar-r
unit ml
spec lsl: 495 usl: 505 target: 500
# Four bottles pulled every 30 minutes across two shifts.
subgroup 498.7 498.7 500.4 499.5
subgroup 501.7 498.0 500.5 500.2
subgroup 498.9 501.9 498.4 500.6
subgroup 499.1 500.0 498.7 499.4
subgroup 499.4 501.4 501.6 501.0
subgroup 497.4 498.9 500.2 497.9
subgroup 498.8 501.2 497.5 501.7
subgroup 498.8 498.7 499.1 502.4
subgroup 499.6 500.1 496.8 499.7
subgroup 498.7 501.2 501.1 502.6
subgroup 499.3 501.4 500.0 499.0
subgroup 501.5 501.1 502.8 500.7
subgroup 499.2 502.2 498.7 496.9
subgroup 499.3 498.7 500.5 501.6
subgroup 500.7 499.7 499.9 502.8
subgroup 498.5 499.3 498.8 501.3
subgroup 500.8 499.3 500.9 498.9
subgroup 498.5 500.1 499.1 497.5
# Head 6 re-seated at 14:00 — the filler comes back richer.
subgroup 501.4 501.4 500.7 501.1
subgroup 502.4 502.1 502.5 505.1
subgroup 503.0 502.0 503.9 500.4
subgroup 501.9 500.0 502.2 503.9