Making a Monolithic Telescope Part 2: Machining Glass

The second video in the series about manufacturing a small solid telescope. Time to make my hands dirty while doing artisanal stuff.

CONTENTS:
0:00 Intro
0:46 The monolithic version of the Cassegrain
2:23 About baffles and stray light
3:18 Drilling the glass core
6:00 Radius milling the glass surfaces
9:35 Calculating the Best Fit Sphere in Excel
13:52 Drilling baffles
14:23 Using spherometers
15:44 This Beat is Spherotronic
16:31 Rough / fine grinding
18:05 Optical Pitch polishing
20:43 What's next?
22:05 Looking through the uncorrected device
23:34 Thank you!

Previous video in this series about the theory of aspherics and optical design:https://www.youtube.com/watch?v=awOvnubFE8M

Video on the concept of the monolithic telescope featuring inventor Rik ter Horst: https://www.youtube.com/watch?v=HxwhCmO90UQ

Video about radius grinding and the Loh CNC: https://www.youtube.com/watch?v=ahrMrOq_lzc

More about the properties of optical pitch: https://www.youtube.com/watch?v=eZx-dUtl5Pw

You can support Huygens Optics on Patreon: https://www.patreon.com/huygens_optics

Download URL for zip-file containing the example MS Excel sheet for doing BFS calculations: https://www.huygensoptics.com/assets/M2_best_fit_sphere_calculation.zip

Windows program for calculating milling angle and evaluating spherometer readings: https://www.huygensoptics.com/assets/mirror_calculator_V01.zip
Download and use at your own risk. Your virus scanner will probably evaluate this download carefully and scream murder and fire because it is a rarely occurring executable.

I used a few short clips from the following Youtube videos, assuming it is covered under "fair use" by placing references to the channels, and links to the corresponding videos in the description.

At 15:44, I made an 18 seconds remix of Technotronic's hit "Pump up the Jam". Please enjoy the original hit song by these Belgian techno pioneers: https://www.youtube.com/watch?v=9EcjWd-O4jI
At 23:21: Shot take from Edmund Optics video "How an Aspheric Lens is Made": https://www.youtube.com/watch?v=CVDT3u1La6w

Did I forget to mention you here? Let me know and I will set things straight.