风车块计算器 🌀

计算风车拼布块的HST裁剪尺寸和布料用量。

How to Use the Pinwheel Block Calculator

Enter your finished block size and how many pinwheel blocks you need. The calculator uses the 2-at-a-time HST method, which produces 2 HST units from each pair of squares sewn together.

Cut equal numbers of squares from Fabric A (light) and Fabric B (dark). Layer one A and one B square right sides together, draw a diagonal line, sew 1/4" on each side, cut apart, press, and trim to the exact HST size.

Arrange 4 HSTs with the light triangles rotating around the center to form the pinwheel. Press all seams toward the darker fabric and nest the center seams for a flat, accurate intersection.

常见问题

一个风车块由多少个HST组成？

标准风车块使用四个半方三角（HST），排列使其斜向缝线形成旋转的风车效果。使用两种对比布料，每种两个HST。

如何让风车块朝正确方向旋转？

将四个HST排列成较深的三角形绕中心顺时针（或逆时针）旋转。一致地熨烫所有缝线，以减少中心点的厚度。

风车的嵌套缝技法是什么？

将HST缝线交替方向熨烫，使缝份在四个块于中心相遇处「嵌套」在一起。这能减少厚度并形成更平整的交叉点。