johnsmachines

machines which I have made, am making, or intend to make, and some other stuff. If you find this site interesting, please leave a comment. I read every comment and respond to most.

Tag: flywheel

Trevithick Dredger Engine Flywheel

You must forgive me for rushing this blog.  I do feel rather pleased to have made a start on the Trevithick Dredger Engine.

The first part for the TDE was waterjet cut from 6mm mild steel.  I emailed the DXF drawing Tues, it was cut out Wed and picked up today.  Impressive service from Colin and Sandy at Waterjet Geelong.    340mm diameter.  The finish of the cut is so good that some light filing and rounding the sharp edges is all that will be required.  I will machine the bore hole after the shaft is made.  The magazine article is my workshop copy.  It will not remain this pristine for long.

flywheel flat.JPG

flywheel edge.JPG

The thinness of the flywheel is a Trevithick characteristic.

Model Triple Expansion Steam Engine. First taste of steam tomorrow!

I was very excited to see my triple running reasonably well on air recently.  But it was tight, and required a decent gutful of air pressure to turn it over.  But it did go!

Then it seized.

The cause was the intermediate cylinder valve rod seizing in its guide.  Probably a bit tight,and not getting any oil.

So I have loosened the gland, installed a displacement oiler, and made and installed a flywheel.  I also finished the pipework around the condenser.

IMG_6173.JPG

Displacement oiler top left, brass flywheel, and pipework.  The condenser on a marine engine would have been cooled with seawater, pumped with a separate pump, but I have used the 2 pumps on either side of the Edwards air pump.  In future I might install another pump.  The book “Marine Steam Engines and Turbines” has been been very useful.  

IMG_6179.JPG

I just like all of the brass and copper and components in this picture.

IMG_6170.JPG

The flywheel is too big for the scale, but my model does not have the weight and momentum of a propeller shaft and propeller, so a sizeable flywheel seemed appropriate.  Later I will add some gear teeth on the flywheel and a cranking handle on a removeable pinion, which some medium size engines had to assist with cranking to a starting position.  

So, tomorrow I will hook my triple up to Stuart Tankard’s vertical boiler, and see what happens.  I am sure that steam leaks will be revealed.  Hopefully there will be a video worth posting!

Flywheel and Sugru

Firstly the SUGRU update.

Sugru, if you have been following this blog, is the flexible black insulating repair compound which I used to repair some electric cables on my lathe.   The cables supply power to the stepper motors, so they are in constant flexing motion when the lathe is operating.  I wondered whether the Sugru would remain adherent and intact.

Well, I am pleased to report that after several weeks use, the Sugru looks as good as the day I applied it.  A winner!

The flywheel.

This is the flywheel after some sanding and polishing with a Dremel.

IMG_3139

The 100mm flywheel, with lubricant ready to be applied.

I might have to make another Stirling engine to use it.

Machining the flywheel