Project Information-Planning-Dimensions

Sizing and Planning Calculations


The Dimensions tab helps determine the number of warp ends and weft picks required to end up with the final size of the woven item as well as the length of warp required to weave all the items. The calculations do not change the weaving draft, but give the weaver an idea of how many warp and weft ends to design and how long the warp needs to be wound. The drivers also impact the yarn requirements calculation for the project.

Calculation Drivers

The calculation drivers are on the upper left. Initially these values are all zero. Any or all of these can be entered to impact the calculations.

Draw-In -the difference in width in the reed and the fell of the cloth.

Warp Take-Up - this percentage increases the minimum warp yardage requirements based on the bending of the warp yarns as they are woven.

Weft Take-Up - this percentage increases the weft yardage requirements based on the bending of the weft yarns as they are woven

Loom Waste - inches/cm not woven at the start and end of the warp

Shrinkage Width and Length - this is the expected shrinkage after wet finishing the cloth

Current WIF:

Current WIF Warp Ends - the current value is automatically populated from the current draft. If the warp ends in the WIF do not represent the entire project (such as having the warp ends repeated a number of times), an override width in the reed can be entered on the next yarn requirements tab so that the yarn requirements will calculation properly.

Current Width in Reed The current value is a calculation of Warp Ends in the WIF divided by the Ends per Inch (or Ends per CM). .

Weft Picks The number of weft picks in the current WIF.

Woven Length The number of weft picks times the Picks per Inch or Centimeter.

Finished Estimate Width and Length The calculation drivers are used against the current WIF to determine the estimated finished size of the piece.

Target Finished Size per Piece (right column)

Entry of the Target Width and Length optional. The purpose of entering the Target Size is to calculate the size requirements needed for the draft, such as number or warp ends, woven and warp length, so that the finished piece will meet the target. When entering a target width and length, these should be the size of a finished piece after wet finishing. Allowance for hems, if any, should be included in the target length.

Notice that the "No Pieces" is the number of the target size pieces you plan to weave.

If you plan to do some sampling on the warp, enter the inches planned to weave. Fringe is listed separately as it is not woven, is not subject to take-up and does not consume weft. If your fringe will consume loom waste, there is no need to enter fringe separately in this section, but when planning multiple pieces, the warp that consumed that is not a part of the waste can be important for the calculations.

For example, suppose you are planning to weave two scarves that will be 70" long by 8" wide and have a 6-inch fringe on each end. Enter these values in the target size area, enter estimates in the calculation drivers and click "Calculate Dimensions" . The Size Requirements for Target area will reflect the calculations as well as current WIF estimated final size.

Size Requirements for Target - Calculations

No. Pieces defaults to 1 if left blank or set to 0

Number Warp Ends for Target Width = Req'd Width * EPI/EPCM.

Req'd Width in Reed = (Finished Width + DrawIn) * (1 + Shrinkage in Width)

Minimum Warp Length = (((Woven Length per Piece * (1+Takeup Pct)) + Fringes)) * No. Pieces) + (Sampling * (1+TakeupPct)) + Loom Waste (shown in yds/meters)

Woven Length Per Piece = Target Finished Length * (1 + Shrinkage in Length).

Number of Picks per Piece = Woven Length per Piece * EPI/EPCM

Total Woven Length = Woven Length per Piece * No. Pieces in Project + Sampling (shown in yards or meters)

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