Guest Adam Balogh joins us to discuss lapping and his exploits in telescope mirror making. We draw parallels (!) between lapping mirrors and lapping in precision machining. Much is learned.

Things mentioned:

Adam's Instagram: https://www.instagram.com/laneymachinetech/

ABLAP: https://ablap.com/

Cerium Oxide: https://en.wikipedia.org/wiki/Cerium(IV)_oxide

Surplus Shed: https://www.surplusshed.com/

Zerodur: https://en.wikipedia.org/wiki/Zerodur

Caswell Plating: https://caswellplating.com/

Telescope mirror blanks: http://www.telescopemirrorblanks.com/mirror_blanks.html

Newport Glass: http://www.newportglass.com/angwcat.htm

Advanced Glass: https://www.advancedglass.net/index.cfm?Page=Telescope-Mirror-Blanks

The guy who did all the mirrors for John Dobson and the sidewalk astronomers: http://www.alcoat.net/

Majestic Coatings: http://www.majestic-coatings.com/

Spectrum Coatings: https://www.spectrum-coatings.com/

Observatories with telescope making workshops:

https://chabotspace.org

https://stellafane.org/

Source for the spray-on silvering solution for front surface mirrors: https://angelgilding.com/pump-spray-silver-kit.html

Links to more stuff is at https://pfg.gg/links

("PFG Stones" is a trademark of Kinetic Precision)

Aaron Walla joins Spencer to discuss some new topics and follow-up on his search for a grinder in his home shop

We talk coolant, thermal control of coolant, tools and toys.

Follow Aaron on Instagram at "@walla.tool"

Follow me on Instagram: "@spencer_webb_NH"

200-Watt magnet heater: https://amzn.to/3Xx4e38

800-Watt submerged heater: https://amzn.to/3QCku0y

Temperature controller: https://amzn.to/3IJDxEv

Lutron Caseta remote controlled outlet: https://amzn.to/3H50l0j

Qualichem 250C data sheet: http://backend.qualichem.com/product_docs/df183_Xtreme%20Cut%20250C%20(1.12.15).pds.pdf

("PFG Stones" is a trademark of Kinetic Precision)

With guest Aaron Walla of Walla Tool (@walla.tool on IG), in which we discuss choosing and purchasing a surface grinder to fit the requirements of the shop. And offer Aaron Walla unwanted advice to "help" him with his decision. And the usual stuff.

(Apologies for the technical quality of this live production. I was troubleshooting issues right up to launch time, and decided to proceed with lower video quality rather than delay. I vow to solve these issues for the next one. -SW)

Follow me on Instagram: "@spencer_webb_NH"

("PFG Stones" is a trademark of Kinetic Precision)

In which we report on the effectiveness of heating the coolant to make up for winter. Thermal growth in the grinding is calculated. The supply chain is repaired. The Hive-Mind helps design battleaxes for me, per the request of conjette.art. Really.

Follow me on Instagram: "@spencer_webb_NH"

800-Watt submerged heater: https://amzn.to/3QCku0y

Temperature controller: https://amzn.to/3IJDxEv

("PFG Stones" is a trademark of Kinetic Precision)

The YT switchover. Mom's 167 boxes. Making a coolant cozy. The surprising thermal mass of 30 gallons of coolant.

Bubbler Stone: https://www.amazon.com/gp/product/B08B3MX4BP/

Oil Pan Heater: https://www.amazon.com/gp/product/B0076DUV2Q/

Heater Controller: https://www.amazon.com/gp/product/B01486LZ50/

Follow me on Instagram: "@spencer_webb_NH"

("PFG Stones" is a trademark of Kinetic Precision)

Special Guest: Stefan Gotteswinter (@stefan_gtwr on IG, Stefan Gotteswinter on YT).

Precision Cordless Drill Balancing. Side-saddle Grinding. What a pair of stones! Learning to be, and not to be precise. Legal beer.

0:00 Welcome and housekeeping

4:00 Stefan Gotteswinter joins

5:25 Has Stefan been following Spencer's interest in lapping?

5:50 Stefan's recent video about drilling on the lathe using the carriage instead of the tailstock.

8:00 Giving away a McMaster-Carr catalog

11:05 Any tips on making Annular Cutters

12:30 Favorite or preferred brand of lapping compound?

15:30 Follow up on annular cutter, to use on a lathe

17:00 Silver Steel is a term used in the UK for Drill Rod; it's Silberstahl in German

17:55 What German Ginger Beer does Stefan recommend?

18:55 If Ginger Beer is illegal in Germany, how do you Justify Radler?

20:30 What is the smallest part Stefan has made in his shop?

21:18 How difficult is it for Stefan to get parts Nitrided

22:13 If you had Elon Musk's money, which Mill or Lathe do you buy?

23:50 What is your favorite way to "Clock Out" a headstock?

26:55 For M1.2 Tapped hole what type of Tap do you recommend?

28:15 Adam B says he has a way to align a Headstock with the Cross Slide using a Special Tool that has a Gauge Ball on it. Details to Follow.

29:10 How to prevent M3 Taps breaking in stainless steel on a CNC lathe?

34:20 Marvin Groeb @marvgro recommends Zirconia nanoparticles as a lubricant

30:45 How to improve the rigidity between the head and vertical column of an RF-45

32:20 Do you use IPA (isopropyl alcohol) on steel in the CNC router? How do you prevent it catching fire?

35:05 Stefan is asked for his opinion on Adam Demuth's (@adamthemachinist) 3D printed Vee blocks

36:55 Stefan is asked for drawings of his addendum to Robin Renzetti's D-Bit Grinder modifications

38:05 Adam B (@Laneymachinetech) ask for Stefan's comments on Cylindrical Grinding and Lapping to optimize geometry and surface finish.

42:05 Spencer asks Stefan about his new Grinder

51:30 What do people need to learn to do more precise work.

53:50 Stefan is asked to regrind precision ground stones that he mad for a customer.

57:45 When grinding a radius on the D-Bit, how do you indicate the offset of the work?

59:10 What is the spindle speed of the D-Bit?

59:50 What projects does Stefan most enjoy?

1:01:30 What is missing from Stefan's tool collection?

Flat is where it’s at. Adam B. From Laney Machine Tech joins us, and we nerd out. Optical flats, monochromatic light sources, and how to get set up to make measurements for peanuts.

Forget three plates. Top is concave, bottom is convex. Tumbled? Charged?

PFG Stone Bevel progress update, melting of the snow, awesome solar electric days. NOZ update. Special guest @marvgro from Kern!!

Solar panel opinions. Balancing news, brief bevel update (excuses). Great Guest: Adam Demuth. T-shirt updates with Conjette. Art meets Grinding.