Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Model & Toy Steam Engines – Stirling Cycle – Flame Lickers – Small Antique Originals => Topic started by: Jim on February 08, 2026, 08:28:42 pm

Title: Re: RW-BL1K some mods done & Running a Blue Thunder Generator
Post by: Jim on February 09, 2026, 04:41:14 pm

Quote from: St Paul Steam on 12 hours  ago

Very nice mods Jim. interesting way you "hobbed" the knurling on the step pulley.

Thanks Bruce, I've done many drive pulleys now and made up about 7 jigs for different sized axles.
It works very well and very similar to what a Wilesco drive pulley looks like.
Here's a brass drive pulley I hobbed yesterday -

[attachimg=1]

[attachimg=2]

Title: Re: RW-BL1K some mods done & Running a Blue Thunder Generator
Post by: St Paul Steam on February 09, 2026, 06:22:47 am

Very nice mods Jim. interesting way you "hobbed" the knurling on the step pulley.

Title: RW-BL1K some mods done & Running a Blue Thunder Generator
Post by: Jim on February 08, 2026, 08:28:42 pm

Rocking Whale RW-BL1K Miniature Steam Engine Plant with some modifications & running a Blue Thunder Generator & Light
Added a steam condensate catcher, two step hobbed aluminium drive pulley and a brass knob to the Stephenson Linkage handle.

https://www.youtube.com/watch?v=34AuK3ilJeg