The Shop > Tools
milling spindle upgrade
PekkaNF:
--- Quote from: vtsteam on April 01, 2015, 09:54:31 PM ---This is a little smaller than a floor. :doh:
I've got cast in place steel containers for stands. They're solid.
Concrete filled steel lolly columns can be bought at local lumberyards. The cores don't fall out, even when cut. We've used sections of them for rollers for boats weighing tons. They don't even have fasteners through the sides as suggested earlier for the mill base repair. Or rebar, etc. Classic case of internet research and theorizing vs reality.
--- End quote ---
Or maybe manufacturer is smart and adds something on the concrete mix? I have met concrete that has something added to to it to EXPAND it intially to outmanouver further shrinking.
Something like this:
http://www.puumarket.ee/?op=body&id=42&prod=269&sid=2104
That english translation looks funny, but I'm not familiar with the real one.
Anyways, I have tempted to measure real world concrete shrinkage on our machinebuilding application, but been putting it of for years, because can't get any immediate results :lol: :lol:
Pekka
bertie_bassett:
Well the concrete casting is still on the maby list, though I don't really fancy the weight of it a concrete slab with 1/2" cast iron skin sounds rather heavy, and ill have to move it on my own. Also the column is tapped and bolts down from underneath so not sure how id get around that one
There is such a thing as expanding concrete. Usually used to fill in holes in the ground. Just don't use it indoors as it gives off hydrogen. Had a one of my pumping stations explode a few years back, when contractors used the stuff
NormanV:
On page 75 of the book Stuff Matters by Mark Miodownik he states "But, as luck would have it, steel and concrete have almost identical coefficients of expansion"
vtsteam:
Apologies to Matt for tone earlier. :bow: It does bring up a topic I have often had to deal with. But no need for criticism.
I do think that theory online, in general often overwhelms what actually happens when tried in real life, and it's one of the reasons I do so much experimenting in my projects, despite what is published. I think there are online justifications for both sides of practically every techncal argument, and they're all true, to some degree.
One of the main reasons that is possible is that the devil is in the details, and online theories often generalize (or get generalized by repetition or expansion) to the point that they are meaningless to many specific cases. Generalizations are common. Specifics, and expressed theoretical limitations, rare. And that stifles experimetation and discovery. Specifics, accident, and even failure are essential to the realization of many projects, and innovation. And much learning about the world.
I ought to be from Missouri, though Vermont is considered a fairly independent minded state, too. I like to do things and find out what happens for myself, or if I can overcome conventionally perceived limitations. Anyway, sorry about the exasperation level expressed, but it's not personally directed -- it's the internet "knowlege base". Taken as an approximation of reality it's helpful, otherwise, I find it frustrating at times. :beer:
mattinker:
--- Quote from: vtsteam on April 02, 2015, 11:33:44 AM ---Apologies to Matt for tone earlier. :bow: It does bring up a topic I have often had to deal with. But no need for criticism.
I do think that theory online, in general often overwhelms what actually happens when tried in real life, and it's one of the reasons I do so much experimenting in my projects, despite what is published. I think there are online justifications for both sides of practically every techncal argument, and they're all true, to some degree.
One of the main reasons that is possible is that the devil is in the details, and online theories often generalize (or get generalized by repetition or expansion) to the point that they are meaningless to many specific cases. Generalizations are common. Specifics, and expressed theoretical limitations, rare. And that stifles experimetation and discovery. Specifics, accident, and even failure are essential to the realization of many projects, and innovation. And much learning about the world.
I ought to be from Missouri, though Vermont is considered a fairly independent minded state, too. I like to do things and find out what happens for myself, or if I can overcome conventionally perceived limitations. Anyway, sorry about the exasperation level expressed, but it's not personally directed -- it's the internet "knowlege base". Taken as an approximation of reality it's helpful, otherwise, I find it frustrating at times. :beer:
--- End quote ---
Apology accepted! I am well aware of how you function, we've both been contributors to this group for some time now. My feeling is that I have a certain amount of knowledge that I can share. Take it or leave it, but know that intentions are good!
Regards, Matthew
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