Uploaded February 2026 | Updated September 2026, 5 hours ago

---

Lets try out different kinds of engraving bits in hardened and unhardened steel.
____________________
If you enjoy my content and would like to support my channel... I'd really appreciate it.
Please join me on Patreon and help build this community.
patreon.com/RotarySMP
or sign up for youtube memberships using the "JOIN" button above.
or please just buy me a coffee...
tinyurl.com/5cv2yscb
____________________
My TIG 200P ACDC was supplied by Arc Captain.
If you are on the fence on a new welder, now is the time, as Arc Captain has great New Year special offers.
If use this link to purchase from them, and you will receive a discount, and a small portion of the profit will flow to help support the channel an no cost to you. Thank you.
arccaptain.com/?ref=rotarysmp
____________________

00:00 - Intro
00:36 - How bad is the run-out of my Henninger spindle speeder?
00:58 - Repeatability of ER collets.
03:44 - Run-out at the spindle speeder collet
04:13 - Grinding a D-Bit
04:39 - Engraving with a HSS D-Bit
07:27 - Pyramid tipped carbide engraver
08:43 - Welding over a bad engraving
11:07 - Engraving the original Schaublin hardened tool holders
12:16 - Final thoughts on the spindle speeder
12:52 - Surface grinding the top surface
14:19 - Finished engraving