"A Beginners Engine" From Model Engineer.

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ParCan:
Ok: Both sides of the Flywheel are made.
Centre is reamed to 8mm and fits like a glove on my Stainless steel shafts.

Just need to chuck it up again to skim the outside edge.
I do however have concerns gripping a 9mm deep shoulder / 20 mm dia (I still have a mm to remove if need be) and turning the edge off something 100mm dia.

Are my concerns unfounded ?

Suggestions welcome as always.

Then it's off to the Mill and rotary Table to make nice holes in it.
Never used the table (Bootfair find) It's the same size as the fly wheel (100mm) so clamping clues welcome.

sbwhart:
I do however have concerns gripping a 9mm deep shoulder / 20 mm dia (I still have a mm to remove if need be) and turning the edge off something 100mm dia.

That's how I do it, should be fine, just don't run the lathe fast or it will chase you round the shed if it comes off :D and take small cuts.

Stew

ParCan:
Hi Guys.

Flywheel is now complete.
It's on centre, and looks like it's going to be ok.

Started on the Cylinder yesterday, I'm making it from Cast Iron (Sash Weight) cos I have some of a suitable size.

You know it's getting hot (Drilling it to 12mm) when your squirt of coolant boils as it touches the work !

I'll complete the bore today.

My Boring tool is rather small but it seems to cut the Iron nicely.

NickG:
Cast iron will be good, i am using cast gunmetal for mine as have a bit the right size. Is your drill blunt or were you running it too fast? Slow cutting speed for cast iron and it doesn't usually get hot in my experience.

ParCan:
Hi.
Apologies for the Picture size in my last post....

The drill was brand new when I started. It's now somewhat 'used'
Cutting speeds were slow (slowest on an ML7 without the back gear) and I believe appropriate.

Cylinder is bored to 16mm (tight fit on a 16mm Milling tool shank)
Made a Hone out of some Plastic, Probably Nylon, 50mm long X 16mm dia to make it a sliding fit. Tapped one end blind M8.
Starting with Course grinding paste, then fine, I ran the bore up an down the hone for around 10 mins.
Clean down with White Spirit between each paste.

A Quick final with Solvo Autosol (Very Fine) I now have a smooth bore with a fine crisscross of light scratches.

Now it's time for a thorough clean down of the lathe. (to get rid of both the Cast Iron and the Grinding paste)

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