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08-26-2020, 07:13 AM | #21 | |
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Re: Crankshaft Counterbalance Weight
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08-26-2020, 02:50 PM | #22 | |
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Re: Crankshaft Counterbalance Weight
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We roughed the SAE6150 billet in the lathe. Left about .050 to finish in the crank grinder. After finish grinding to size we had the journals nitrided. While it could be done, it would take many hours to finish the journals to size in a lathe due to the slow rpm needed bacause of the billet weight and off balance situation. The engine was very successful for 2 race programs and then the block broke through one of the main webs due to lack of support from the cylinder bank we cut off. The engine had a half of a V8 Hilborn injector, a Racer Brown ST2 grind on the cam and a Corvette head. The engine was in a 1947 Kurtis midget chassis. |
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08-26-2020, 05:59 PM | #23 |
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Re: Crankshaft Counterbalance Weight
Brett, we did not get a tool post grinder with this behemoth. But there was one listed in the pre-war catalogue.
The machine has been "rescued" from the scrap heap so may never be used properly, but we may refacea flywheel etc just for fun. The 4 jaw chuck is too heavy for our 1/2 ton jib crane shown lifting the motor. SAJ in NZ |
08-27-2020, 08:35 AM | #24 | |
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Re: Crankshaft Counterbalance Weight
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It definitely is a monster, no doubt. I would love to have a big Monarch or ?? lathe like that however I just don't have the real estate to spare just to say I have one. |
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08-27-2020, 08:56 AM | #25 |
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Re: Crankshaft Counterbalance Weight
Counterweights, when properly positioned and sized, will reduce reciprocating and rotating vibrations to less annoying frequencies and severity (amplitude). Lightening the flywheel / pressure plate promotes vibration about the rear engine mounts, and may manifest itself in clutch chatter. The flywheel and pressure plate are a gyro with a 82 pound rotor, and they oppose changes in motion of the engine as a whole, and the crankshaft.
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Bob Bidonde Last edited by Bob Bidonde; 08-30-2020 at 08:46 AM. |
08-27-2020, 02:17 PM | #26 |
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Re: Crankshaft Counterbalance Weight
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08-27-2020, 06:29 PM | #27 |
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Re: Crankshaft Counterbalance Weight
In reference to the comments about big lathes, my father worked in engineering all his life and on some big stuff. I saw a picture once (I don't know what became of that picture) of one of the lathes his company used. It was so big that the saddle had ladders for a man to access the cross slide and another to the top slide. The top slide had a hand rail around it to prevent the operator falling the considerable distance to the floor. I guess they had to use a crane to change the cutting tool and power to move the slides.
What they used something like that for, I don't know but I'd love to see it now. I guess it ended up making about 1,000 Toyotas!
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08-27-2020, 07:23 PM | #28 | |
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Re: Crankshaft Counterbalance Weight
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A steel Co. in this area had one similar back in the 50's. |
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08-27-2020, 07:38 PM | #29 |
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Re: Crankshaft Counterbalance Weight
Here is a lathe I ran at a tourist railroad for awhile. They had an even bigger one they used to turn drive wheels off of steam engines.
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08-28-2020, 04:03 AM | #30 |
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Re: Crankshaft Counterbalance Weight
Wow folks! I will never say "mines bigger than yours" again.
I will stick to challenging 90 year olds to arm wrestling in future. SAJ in NZ |
08-28-2020, 09:15 AM | #31 |
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Re: Crankshaft Counterbalance Weight
Cass Scenic Railroad, Cass West Virginia, 2019.
Last edited by GPierce; 08-28-2020 at 09:20 AM. |
08-28-2020, 01:47 PM | #32 |
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Re: Crankshaft Counterbalance Weight
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08-28-2020, 07:56 PM | #33 |
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Re: Crankshaft Counterbalance Weight
Turning propeller shafts makes sense. Come to think of it, I do recall dad talking of doing that and cutting gears for such like heavy applications. He served his apprenticeship during the war cutting gears for the military. Probably have to buy them from China these days and who looks like the most likely adversary???? What could go wrong, I wonder.
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