Tech Talk: Model Engineering with Todd Cahill
ฝัง
- เผยแพร่เมื่อ 18 ก.ค. 2022
- Our longtime friend and artist/machinist Todd Cahill speaks to us about model engineering. www.steamachinesculpture.com/
This Tech Talk opens with a look at the Museum’s collection of model steam engines on display, followed by a visit to Todd’s studio for a look and a demonstration of some of his own models, and as a special treat: Todd performs a live steam test on a Waltham-built steam engine from our collection.
Todd shares his experience and insight on becoming a successful model engineer; from the tools of his trade, to getting involved with the New England Model Engineering Society-- a group of enthusiasts and engineers who meet monthly in Waltham and whose annual Model Engine Show is one of the highlights of our calendar.
www.neme-s.org/
Visit us online: www.charlesrivermuseum.org
Support us by becoming a member: bit.ly/CRMIIMem
Inspiring me into this intricate hobby.
Many thanks. Paul. Liverpool UK
Great video Todd, great explanations the engines and of how to get started in Model Engineering and thanks for the plug for the New England Model Engineering Society.
Dick B USA
High praise coming from you, Mr. Boucher! Glad you enjoyed!
Extremely good video Todd. This is an excellent presentation that provides a great description of model engineering. It was very interesting to see your shop and all of the engines you have built.
What a fabulous video! Thankyou :)
Great to see Todds' workbench full of engines and tools, looks similarly chaotic as my own bench top :)
13:12 😊👍...especially in micro power generation and other similar scale applications !
The description of how a triple expansion engine works doesn't seem to be quite right.
I'm aware that there are different types of triple expansion engine, but this one looks a lot like the
Stuart Triple Expansion engine I've been building for the last couple of years, which is a receiver type.
The condenser has nothing to do with the low or intermediate pressure cylinders.
Partial condensation of steam seems to defeat the object of the engine's design.
In the high pressure cylinder, heat in the steam is converted to work, it expands and its pressure drops.
By means of a valve, steam exhausted from the high pressure cylinder is piped through to the intermediate cylinder valve chest.
In the intermediate pressure cylinder, heat in the steam is converted to work, it expands and its pressure drops.
By means of a valve, steam exhausted from the intermediate pressure cylinder is piped through to the low pressure cylinder valve chest.
In the low pressure cylinder, heat in the steam is converted to work, it expands and its pressure drops.
The exhaust from the low pressure cylinder may be piped to a condenser, in order to improve efficiency and to recover water.
The relative volume and pressure of steam entering each cylinder is controlled by designing the volume of each cylinder, steam transfer pipe & steam chest (receiver) and by valve timing.
I can't see a pipe taking steam from the high pressure cylinder to the condenser.
But neither can I see a pipe from the high pressure exhaust to the intermediate cylinder steam chest which could be internal.
Having built the Stuart Compound Launch engine which is a double rather than triple expansion engine, I can assure you that it doesn't need a condenser for it to run. If it did, it wouldn't be able to run on compressed air.