Mixed Tubing Cut Lengths and the Order of Allocation
When a job needs several tubing lengths, assign the required pieces to the available stock before cutting the first group. A cut that satisfies the shorter pieces can leave remnants too short for the remaining long pieces, even though a different allocation could have completed the job.
Define complete cuts and separate stock segments
PT0502 is clear polyethylene tubing listed at 5 inches wide, 2 mil and 2,150 feet long, supplied as one roll. The 10-foot segments in the example below are hypothetical measured remnants from existing stock. They are not a separate supplier selling unit.
Assume the approved job requires two continuous 6-foot pieces and two continuous 4-foot pieces. These full cut lengths already include the end material required by that hypothetical method. Joining separate remnants is not permitted, and the idealized arithmetic excludes additional cutting or setup loss.
Plan both lengths together
| Plan | First segment | Second segment | Result |
|---|---|---|---|
| Allocate a long and short piece together | 6 feet + 4 feet | 6 feet + 4 feet | All four required pieces |
| Cut both short pieces first | 4 feet + 4 feet; 2 feet left | 6 feet; 4 feet left | One 6-foot piece still needed |
The second sequence leaves 6 feet in total, but as separate 2- and 4-foot remnants. Neither can supply the outstanding continuous 6-foot piece. Once those cuts are made, the original two-segment plan cannot be restored by adding the remaining lengths on paper.
Reserve the assigned stock before making cuts
Mark each physical segment and record the cuts assigned to it. Keep the long-piece requirement visible when another operator starts the shorter pieces. Otherwise, two individually reasonable work instructions can consume the same intended stock in incompatible ways.
This example does not establish a universally best cutting algorithm or prove that cutting the longest piece first always minimizes waste. It shows a feasible allocation for one specified set of lengths. Other requirements and stock lengths need their own plan.
Reconcile the actual result before replenishing
Measure usable stock and include the real process allowances before issuing the cutting instruction. After cutting, record complete pieces and separately identified remnants. If an error creates a shortage, look for a suitable approved continuous segment rather than assuming a new full roll is the only option.
Review PT0502 tubing when additional material is needed. Retain the required piece lengths, segment assignments and actual remaining stock together so purchasing sees the continuous-length requirement that remains.