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

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: Jim on May 29, 2021, 04:39:59 pm

Title: Re: This is very impressive
Post by: Steamandoil (Tim) on June 21, 2021, 01:34:02 pm

That has to be one of the top models I've seen. The SPS sawmill is up there pretty high and I've seen a steam engine running a baler and thrashing machine. But a log saw is always cool.
This one is much easier to transport and store! When I see a log saw at a show I always think how grueling the work was in the day they were used.

Title: Re: This is very impressive
Post by: eifion on June 19, 2021, 06:10:56 am

that is very well done

Title: Re: This is very impressive
Post by: RobA on June 04, 2021, 10:10:15 am

Quote from: 70Rcode on June 03, 2021, 10:38:16 pm

Hi Rob,....in my "Flywheel Fix' update post, I'm sure after the  heated hub & chilled shaft temperature/dimensional normalized, the hardened set-screws "match seated" their own precise mating shaft dimples....No hint of hub--shaft slippage or need to re-torqre set screws yet after 1 1/2 yrs running.....

Yes that will work well. But the raised dimples can make the flywheels difficult to remove, as others have found out. The flat spots solve that problem.
The factory should also place the set screws around 90° apart instead of 180° apart. This will create a two point plus linear contact instalation, rather then just a 2 point.

Title: Re: This is very impressive
Post by: krypto31337 on June 04, 2021, 07:35:23 am

That is some awesome work!  He is working at a very high level.

Title: Re: This is very impressive
Post by: 70Rcode on June 03, 2021, 10:38:16 pm

Hi Rob,....in my "Flywheel Fix' update post, I'm sure after the  heated hub & chilled shaft temperature/dimensional normalized, the hardened set-screws "match seated" their own precise mating shaft dimples....No hint of hub--shaft slippage or need to re-torqre set screws yet after 1 1/2 yrs running.....

Title: Re: This is very impressive
Post by: RobA on June 03, 2021, 08:36:30 pm

Yes, very impressive setup. I noticed he must have had the flywheel loosening problem. Looks like he machined/cut a slot in the crankshaft and flywheel, then locked them together with a square key. A very correct way to solve the problem. But a simpler solution is to file/grind/mill flat spots on the crankshaft where the set screws contact it. I did that on my M90 and it works so far. Upon disassembly of my M91, I noticed the factory is now machining flat spots for the set screws, albeit very small flats. You have to be real careful to get the set screws on those tiny spots upon reassembly.

Title: Re: This is very impressive
Post by: 70Rcode on June 03, 2021, 05:33:52 pm

WoW .... What an amazing constructed, functional, vintage model crosscut saw !! ...And such a Fine running M90 not missing a beat !!....Thx for sharing your video,....tom.

Title: Re: This is very impressive
Post by: Weedensteam on May 29, 2021, 11:16:22 pm

Loved it, nice to see these little engines do actual work, thanks for posting Jim

Title: Re: This is very impressive
Post by: St Paul Steam on May 29, 2021, 10:36:54 pm

What a neat application for this hit N miss engine , brilliantly carried out and the presentation is off the charts sharp ! Thanks for showing us Jim.

Title: Re: This is very impressive
Post by: RedRyder on May 29, 2021, 06:35:03 pm

That is a neatly added on to M90 and how cool is that?

Very nicely done drag saw.

Gil

Title: This is very impressive
Post by: Jim on May 29, 2021, 04:39:59 pm

This is very impressive -

https://youtu.be/NLjBnQF0zIU