Local 7 Wiki

Section 48: Formula for a Gore Pattern (Regular Method)

PreviousNext

Required Information

  • Heel and Throat measurements

Formulas and Measurements

  • Add 3/4" to the Heel measurement and 3/8" to the Throat measurement Draw a 90 degree angle with the vertical line to the left side Take the Heel measurement plus 3/4" and divide by 2 and mark this number on the vertical line from the base line.
  • Take the Throat measurement plus 3/8" and divide by 2 and mark this number on the vertical line Find the exact center of both points and draw a semi-circle from this point as shown in Figure 1.
  • Trisect this semi-circle into six equal parts and label as shown Draw 90 degree lines up from the Base Line to the points on the 1/2 circle Divide the circumference by twice the number of equally divided parts of the semi-circle and draw the Stretch-out for the gore pattern as in Number all the lines of the stretch-out as shown Take measurements from the base line to numbered points on the 1/2 circle and transfer to corresponding numbered lines on the Stretch-out Connect all the points on the stretch-out to form the gore pattern.

Procedure

  1. Step 1

    Obtain Heel and Throat measurements using the Machinist Figure Method or from a Miter Chart. Add 3/4" to the Heel measurement and 3/8" to the Throat measurement

  2. Step 2

    Draw a 90 degree angle with the vertical line to the left side

  3. Step 3

    Take the Heel measurement plus 3/4" and divide by 2 and mark this number on the vertical line from the base line. Take the Throat measurement plus 3/8" and divide by 2 and mark this number on the vertical line

  4. Step 4

    Find the exact center of both points and draw a semi-circle from this point as shown in Figure 1. Trisect this semi-circle into six equal parts and label as shown

  5. Step 5

    Draw 90 degree lines up from the Base Line to the points on the 1/2 circle

  6. Step 6

    Divide the circumference by twice the number of equally divided parts of the semi-circle and draw the Stretch-out for the gore pattern as in

  7. Step 7

    Number all the lines of the stretch-out as shown

  8. Step 8

    Take measurements from the base line to numbered points on the 1/2 circle and transfer to corresponding numbered lines on the Stretch-out

  9. Step 9

    Connect all the points on the stretch-out to form the gore pattern. Step10. Add for a lap on one end or the other. Use your center punch to mark where the bead and ccccrimp will start and terminate (usually the 4 points). Figure 1 re not to scale,