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Thread: Trueing a large wheel
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16th March 2014, 08:22 AM #16SENIOR MEMBER
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I can suffer from that as well! I have banned myself from garage sales now. It's good that these tools get a second life and a saw vice can still be used today!
Up until yesterday I thought that was a larger wheel. It looked big enough to stand in front of it grinding an axe! I clearly missed something in the photos ( or skimmed past your dimensions..sorry). It's still a great find!
If it is classed as a small wheel in the old money, maybe it was a job site sharpener?..... Maybe.
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16th March 2014, 08:39 AM #17Junior Senior Member
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This wheel is about 600 in diameter (approx, I haven't measured it) and 100 wide. If love to see how big the bigger wheels talked about in earlier posts are.
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17th March 2014, 07:26 AM #18SENIOR MEMBER
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I would class that as a big wheel.
I wonder why they were hung up on the wheels being bigger in the past. Surely the hollow on a chisel from a 600 to 900mm wheel would not make a huge functional difference.
Maybe it's the weight of the larger wheel kept it running substantially longer between treadling?
Are you planning on making a dripper or a water trough?
I did see a dripper setup on youtube once that I though had merit. They had a paint brush in a jig just in front of where the water dribbled on the wheel. It acted as a wiper to flow the water on the face and also wipe any slurry off the stone.
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17th March 2014, 07:53 AM #19GOLD MEMBER
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For the same axle speed in rpm, the rim speed rises quite quickly as the wheel gets bigger in diameter.
Recall that at the equator, a person is being carried eastward at something like 2,000 mph.
Otherwise, you could not do an entire day/night thing in 24 hrs. OTOH, at the poles,
all you have to do is to turn around, 360, in 24 hrs.
My Delta miter saw 30cm blade has a rim speed of approx 180 mph.
And that's with the motor speed stepped down with the belt drive.
I can't imagine trying to put fine edges on wood working tools with a big stone like that.
Lots of water to flush away swarf and a very gentle freehand touch.
Possibly, it is in very good condition because it was a PITA to true up or simply inadequate.
Recall that oil stones and water stones of many shapes and sizes have been popular for centuries.
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17th March 2014, 09:07 AM #20Junior Senior Member
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If I were to but a diamond pointed truing thingo, what would I need to ask for?
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17th March 2014, 02:35 PM #21
Good Morning China
Maybe, but I am not convinced.
To sharpen something you need to be sitting or standing at the end of the wheel facing the flat of the wheel - far right hand side of the photo. It would be rather difficult to work the treadle from that position - more so if you were seated.
Have you ever seen a traditional grind stone with a metal frame? All those that I can remember had very heavy wooden frames - spotted gum, Tas blue gum, etc. Perhaps this is a attempt by a handiman to "modernise" a traditional wheel, that did not quite come off? It just looks awkward to use single-handed.
Think the comments about the large size of traditional grind stones being related to inertia and rim speed are quite correct. They were also made from quite soft stones - including sand stone, lime stone and white stone (#) - so they could also be allowing for future wearing - one would not want a grind stone to wear out in less than 100 years. White stone was preferred.
(# Not sure of the proper name or geology of "white stone". Besides being used in grind wheels, I can remember my grandmother and great grandmother using white stones to clean the sandstone flagstones. Wet the flagstones thoroughly, rub with white stone and a white lather forms, rub a bit more, wash off and the flagstones are clean and white for a few days and then revert to sandstone colour. Common practice in central and southern Tasmania, at least, until into the sixties and seventies.)
Fair Winds
Graeme
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