Assembly Complete!

 We're done making our yoyos!

Two yoyos

Fifty yoyos!!

Clear cover

Orange Body

Black ring

Cartoon disc

All the parts came out really well and fairly close to our target design specs.  One issue we faced was dishing in the black ring. To solved this, we added runners to all the flanges.  This fixed the problem but now the outer surface of the ring is fairly rough and can be felt when playing with the yoyo.  This can be fixed with a file but this finishing process is not realistic for any operation larger than this.  Otherwise, everything came out fine.  The black and orange parts snap fit together really snugly. Below is a chart of the measurements of our parts.  We were able to hit most of our target design specs by accounting for shrinkage in the molds and scaling them appropriately.

Part	Measured	Target	Tolerance	Units
Complete Assembly
Outer Diameter	2.449	2.45	±0.005	in
Total Width	1.58	1.58	±0.010	in
String Gap	0.08	0.08	±0.010	in
Yo-yo Body (Injection Molded)
Outer Diameter	2.449	2.45	±0.005	in
Width	0.78	0.75	±0.005	in
Retaining Ring (Injection Molded)
Outer Diameter	1.976	2.02	0.005/-0	in
Inner Diameter	1.876	1.8	0/-0.005	in
Outer Diameter Height	0.295	2.8	±0.005	in
Inner Diameter Height	0.13	0.13	±0.005	in
Clear Cover (Thermoformed)
Diameter	1.757	1.75	±0.005	in
Height	0.16	0.16	±0.005	in
Cartoon Disk (Laser Cut)
Diameter	1.8	1.8	±0.005	in
Thickness	0.125	0.125	±0.005	in

Below is the Run Chart, Histogram, and X-bar chart showing the characteristics of the manufacturing process of the orange body. Please find the graphs for all yo-yo parts here. 

The critical dimension for the Body of the Yo-Yo was its inner diameter (ID).

We chose to have a sample group size of 5 because the standard deviations were smaller the samples showed less variation from the mean.