First mini lathe project, oscillating steam engine.

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Divided he ad:
Hi Ross,

Glad you're getting the threading under your belt. It'll still bite you now and again... Well it does me!

Looking good on the engine front.

Flywheels are notoriously annoying to cut out/ trepan or what have you...

You might find it easier to build one from 2/3 parts?

I'll pen a C-o-C for you to help explain :thumbup:

Does this make sense?

You make a displacer disk (bottom bit) and then the 3 parts of the flywheel are assembled with a smear of loctite (the .9 measurements are to show a smaller fit... Might need to be nearer .6 to allow for easy assembly?)

Anywho, loctite the outer edge of the disc and the hub. install onto the displacer disc and lower the outer ring over and make sure it's all flat (I'd assemble on the surface plate.... There should not be enough loctite to drip down. And it can be wiped up easy enough)

Leave over night and then it should have bonded well enough to be able to drill the centre hole (using soft jaws if you have them? for greater acuracy. )

You could make it in 2 parts but the hub is easier to make and bond I'm thinking!

As long as the bits are a sliding fit and you have a reasonable strength loctite it's a relatively easy way to make a flywheel :dremel:

Hmmm... Thinking about it you could even machine a micro step in the ring (at 6.5mm in this drawing and it's sizes) and centre so the parts sit to a shoulder?
Cat skinning and all that!

Hope that helps? I'm sure someone will go into the trepanning side of things?

If you need any further things to be drawn out, over complificated and long windyfied just ask :beer: :)

Ralph.

Ross:
Hi everyone,

I ground up the tool today an made a start on the recess in the flywheel.

This is how far I got; I'll finish it tomorrow.

one thing I need a bit of advice on I'd the best way to secure the flywheel to the crankshaft.

The drawing says it should be a screw fit. I've got a crankshaft with an m6 thread on the end I can use. Or should I use. Grubscrew to Secure it instead?

Dean W:
Flywheel is looking good, Ross. : )
As for the threads on the crankshaft, if you were to thread the flywheel for the same thread, then screw it onto the
crankshaft, you can get a pretty noticeable wobble due to the clearance in the threads, and when it bottoms out on
the unthreaded part of the crank, it will often cause it to seat cockeyed on the shaft.

If you make a plain hole in the center of the flywheel that is the same diameter as the crankshaft, you can push it on
with a little Loctite and it will hold quite well. A set screw is fine, too. Either way, you need a close fit between the
crankshaft and flywheel to avoid the wobblies. A wobbly flywheel is quite noticeable, so it's something to work at in
keeping it straight.

Best of luck. You look to be getting close to the first run! :thumbup:

Stilldrillin:
Ross.
A plain shaft, with a close fitting flywheel bore. :thumbup:

I hate to see wobabbly flywheels.............

David D

Ross:
Ok that's a a better idea.... Off to the shed now thanks! :thumbup:

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