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 12, 2026, 04:15:17 pm

[attachimg=1]

Title: Re: RW-BL1K some mods done & Running a Blue Thunder Generator
Post by: Jim on February 09, 2026, 08:10:51 pm

It's a great process to stop belt slippage.

Title: Re: RW-BL1K some mods done & Running a Blue Thunder Generator
Post by: St Paul Steam on February 09, 2026, 07:19:28 pm

I chuck the appropriate size axle in the lathe, place the "to be hubbed" pulley on the axle & use a drill with the proper tap, go 2 rounds. Done, 2 minutes total time.

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 February 09, 2026, 06:22:47 am

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