The Mammoth Gear Set explores really really big hoops.  This gear set measures 80 cm x 80 cm (31.5 inches) and comes in four quadrants that snap snugly together.

Pens and paper for scale. Pen is a sharpie felt and the paper is a 8 1/2 x 11 sheet of printer paper

The Gears in this gear set are:
700 frame
700/600 hoop
600/512 hoop
512/420 hoop
420/360 hoop
360 gear
128 (240/72) oval
100/75 hoop
75 gear

The dimensions of the big rings are:
700: 71 cm or 28 inches diameter
600: 62 cm or 24 inches diameter
512: 52 cm or 20.5 inches diameter
420: 43 cm or 19 inches diameter
360: 37 cm or 14.5 inches diameter

The quarter circle pieces have connection points labelled A, B, C, or D.  Alight the two sides with matching letters and connect them with the connector pieces.

This gear set also includes a set medium sized of doughnut pieces for making parallel lines.

What do the numbers in brackets mean?

Shop listing for The Mammoth Gear Set