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Hi Jo.Yes a heavy lump indeed….It was the final addition that made Vincent’s engine run smoothly. The pattern was made from a Vee belt pulley with three rings of flat bar rolled and welded to form the rim. If you can find a spare half hour perhaps you’d machine it and let me know if it’s sound?
That's quite a piece, way beyond my capabilities. I am stretched by an RCM 125mm flying wheel
Hmm, not sure I'd want to stand in the way of a flywheel with only two clamps.
2mm off so far and you can see just how far the two sides of the flywheel were out: one side is showing half machined and the other nothing Jo
Hello JoDid you centre the flywheel casting on the hub centre? or on the inside of the flywheel rim?Just asking.Mike
Graham, is this flywheel much larger in diameter than the 11" one shown on the retlas drawings?Jo what was the reason you had to drill at such a slow speed? that may have been what you chose for the rim but would have thought you could wind up the wick for drilling and boring as clamping looks reasonably well balanced.
Then again I do tend to turn my flywheels quite fast, usually around 250m/min but make sure they are held securely
Quote from: Jasonb on August 25, 2021, 07:21:02 PMThen again I do tend to turn my flywheels quite fast, usually around 250m/min but make sure they are held securelyI would like to see you try mounting that flywheel on your lathe and spin it at that speed. I reckon when you turned it on it would take a large lump out of its bed Jo
I'd actually need to cut a hole in the bed BEFORE turning it on as 11" is my max diameter
It is in industry where speed matters at home we can take our time and do things less stressful.
Those with variable speed hobby lathes will know that the torque drops off as speed is reduced and this becomes even worse as the diameter of the part increases. It is for this reason that using carbide and running the lathe faster than the "lowest backgear" favored by the old Myford stalwerts method is a far better option as it allows the motor to run at a better speed not only increasing torque but also increasing airflow from the inbuilt fan which saves the motor getting too hot which it would running dead slow under a lot of load and maybe even getting stalled.
Those with variable speed hobby lathes will know that the torque drops off as speed is reduced and this becomes even worse as the diameter of the part increases.
PS Missed three flywheels of the count should have been 37
Are you going on to the rest or putting it away for a future build log ? The engine, although with a few castings presents some quite challenging operations for the home machinist.
But I’m now into the second hundred or so over the last 40 years.
Coming along very nicely Jo....what engine is that?Dave
Has a definite small boat flavor to it! I like it!Dave
Do you have compressed air in your shop? A rotary carbide burr would knock the worst of that off in a hurry....and you could clean it up with a file after...easier on the arms...
Don't you need a Dia Grinder for the Alyn castings
It's the Welsh version
Quote from: Jasonb on August 26, 2021, 07:06:19 PMIt's the Welsh version Typical….Dai Affectionate name for David or Dewi in the mother tongue.I was “ Dai cast “
Quote from: Jasonb on August 26, 2021, 07:06:19 PMIt's the Welsh version Quote from: Alyn Foundry on August 26, 2021, 07:12:57 PMQuote from: Jasonb on August 26, 2021, 07:06:19 PMIt's the Welsh version Typical….Dai Affectionate name for David or Dewi in the mother tongue.I was “ Dai cast “ It's clear you Blokes have a lot of time on your hands over there......
That looks a nice crisp casting. Cover it up quick before you start an elephant stampeed No excuses for not finishing off the Bryston now Did the Yoke and caps get cast at the same time?