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Thread: Redneck Lathe
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16th Apr 2021, 09:54 PM #1Diamond Member
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Redneck Lathe
I mentioned in another thread (parts washer solvent) that I had to sort out an urgent job - a mulching/flail mower whose bearings hadn't been greased for many years. The main rotor bearings were pretty straightforward, just requiring the replacement of the wide inner ring bearings and their housing. The trickier part was the rear roller. This is a 1.7m long tube with 25mm shafts at each end. The un-greased bearings had long ago seized, meaning the shaft at each end had eventually broken free and slopped around in the bearing for many years. The 25mm shaft looked like this:
IMG_3599.jpg
Which I think doesn't quite qualify as a "press fit". The worn shaft had a taper to it, meaning I couldn't use a bush. My lathe's spindle bore is 40mm, which isn't quite enough for this tube, and between centres only goes up to 1m, so not an option.
So raiding my (s)crap pile, I came up with this work of art:
IMG_3600.jpg
You might recognise the "bed" as some gal fence posts.
Added some weld while slowly spinning the part using my Ozito precision rotator.
IMG_3601.jpg
And she's all filled up. Turns out that using a dead centre (made from sharpened 12mm threaded rod) is not the best option, as once the heat from the welding has burned off whatever oil was put in there for lubrication, it makes all manner of unhappy noises.
IMG_3602.jpg
Then it's time for my precision toolpost grinder.
IMG_3604.jpg
And a file and emery paper that got it to ~24.95mm
IMG_3603.jpg
Turned out better than I expected, but then again, my expectations were pretty damn low.
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16th Apr 2021, 10:01 PM #2Most Valued Member
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Good work. Those Ozito precision rotators are great.
Chris
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16th Apr 2021, 10:14 PM #3Most Valued Member
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Brilliant. A great example of what can be done with basic tools and a bit of ingenuity.
Steve
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16th Apr 2021, 10:48 PM #4Most Valued Member
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16th Apr 2021, 10:50 PM #5Diamond Member
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17th Apr 2021, 10:07 AM #6Most Valued Member
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Nice work. I like the can-do attitude!
It actually looks pretty good.
Edit: special mentions goes to the cylindrical grinding setup!!
Simon
Sent from my SM-G970F using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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17th Apr 2021, 07:40 PM #7Diamond Member
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I purposely tried to force myself not to to do anything but the bare minimum on any part of this - the rear roller is a slow-turning tube as the tractor is doing maybe 10km/h tops when mowing, nothing about it requires any kind of critical alignment or dimensional precision, the only requirement is that the shaft engages the inner ring of the bearing in a reasonably positive fashion, so that provided the bearing actually gets greased, the bearing is allowed to do its job.
The only bit that could have done with a bit more effort was the grinder setup. It was a challenge to get it sitting properly so as to maintain a parallel grind without flexing or rocking as it made a pass.
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17th Apr 2021, 07:42 PM #8Most Valued Member
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18th Apr 2021, 05:28 PM #9Diamond Member
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We repair a few of those rollers a year at work. having a lathe with 10" spindle bore makes it pretty easy
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18th Apr 2021, 06:07 PM #10Most Valued Member
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19th Apr 2021, 03:02 PM #11Golden Member
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I think you have a damn cheek calling that thing a lathe. What you have there is a cylindrical grinder.
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