Scrap optical comparator, what can it do?
![](https://i.ytimg.com/vi/uNnguYV2JA0/mqdefault.jpg)
17:41
ULTRA PRECISION REPEAT O METER
![](https://i.ytimg.com/vi/f0z7DAr4w7Y/mqdefault.jpg)
7:06
How to check squareness
![](https://i.ytimg.com/vi/eZx-dUtl5Pw/mqdefault.jpg)
12:56
How to make Very Flat Optical Surfaces on Glass
![](https://i.ytimg.com/vi/Um88AN4El-c/mqdefault.jpg)
21:28
DIY Workshop Dust Extraction, Pneumatic System and a Control Panel
![](https://i.ytimg.com/vi/JqwWetTN818/mqdefault.jpg)
12:52
Making some alignment cones for line boring
![](https://i.ytimg.com/vi/ehNCxszok5U/mqdefault.jpg)
31:54
Special Measuring Gage
![](https://i.ytimg.com/vi/aKFBgZja06U/mqdefault.jpg)
15:08
Watchmaking: Machining a Watch Gear
![](https://i.ytimg.com/vi/CHfE_9RR2EA/mqdefault.jpg)
19:12