[TheForge] Little Giant / pulley / rpm / ???

[Bruce .]

Mike,

You sound disgruntled.   Don't be disgruntled.  Every time winter gets you
down, just close your eyes and repeat, "Snow is beautiful!" until the pain
goes away...

And you're dating yourself with the MacHinery reference.  I doubt anyone
under 40 has even heard that one.

I guess I can't blame you for being mildly annoyed by 4 feet of snow.  I
was pissed that we got 5" of snow in central NJ on the first day of spring,
and it didn't quit till dusk, so the plows didn't come through till after
dark which meant I had to wait till morning to shovel out completely
(subcompact cars can't handle 5" of snow, much less a plow-made snowbank),
making me late for my own workshop.

By the time I posted that note about springs, I was so tired from the
workshop (where we build five adjustable anvil stands) that I couldn't even
walk into the next ROOM to find the handbook.

Now that I'm awake in the middle of the night for no good reason, I have
made the trek --  and my memory was correct.  There on pp 450ff (of the
12th Ed., 1943 -- years before I was born!) are formulas for al sorts of
springs.  What I particularly remembered was that it gives the modulus of
elasticity for steel as if it were a constant:  30E6 (or 10E to 12E6
torsional). On p. 452 it gives 21 formulas useful for springs, including
two different calculations of F, which seems to be equivalent to the spring
constant. Not for a minute can I claim to understand these, but I could
probably put one or more of them to use in a pinch.

The MH is one of my most-used books.  Nobody interested in machinery or
mechanical stuff should be without one.  (And don't pay the $1500 that one
local antique dealer wanted to get for his copy!)

Anecdote from our workshop:

We were beveling the mounting notch on the cheap HF anvils we're using
(because they're cheap and we don't have to worry about destroying them)
http://www.harborfreight.com/55-lb-rugged-cast-iron-anvil-69161.html
The bevel is to allow the anvil to be rotated under the mounting bolts,
allowing quick set-up at the demonstration site.

Well, it never occurred to me that there could possibly be a problem doing
this until the guy doing the cutting said that there was a hole there!
Sure enough, there was a casting flaw in one anvil big enough to stick a
finger into up to the second joint!  Little metal BB's came pouring out of
the thing as he cut through.  He stopped work on that anvil immediately and
I took it back to HF for an exchange.  That's one thing about HF -- they
sell shit, but they stand behind it!  (What an image!)


Bruce
NJ

On Sat, Mar 21, 2015 at 11:40 PM, Mike Spencer <mspencer at tallships.ca>
wrote:

>
> Bruce wrote:
>
> > ...when measuring a spring constant isn't feasible, it turns out
> > that you can measure the spring dimensions ("wire" gauge, OD/ID, and
> > maybe pitch) and calculate the spring constant.
>
> Knee-jerk response: And the torsional whatchamacallit of the
> particular steel?
>
> > In principal, this also depends upon the steel, but in practice it
> > seems not so much.
>
> Oh. :-)
>
> I didn't know that.
>
> > Don't ask me how, but I think it's in the Machinery's Handbook.
>
> I just finished shovelling the path [1] to the shop today.  I'm not even
> going to *walk out there* for MacH's HB tonight.  But I'll look by 'n
> bye.
>
>
> > This info went out of my head a decade ago when I no longer needed
> > it ...
>
> Ah yes, so *much* has gone that way.
>
>
> - Mike
>
> [1] Don't get me started on "winter". A typical NS winter is mostly
>     open. Maybe a couple of big storms in Jan or Feb, usually melts or
>     rains off in a fortnight.  There's between 3 and 4 feet of snow on
>     the field right now, a foot of which fell this past week.  The
>     back yard is wedged between 10' plough banks.  I'm actually going
>     to have to plant my potatoes in *dirt* this year because I
>     couldn't get into the field to spread seaweed, even with a 4x4
>     F-250.  The plan was to put the new mods to the A&O hammer through
>     their paces this winter.  But the diesel is half buried and the
>     snow is up over the anvil.  Feh.
>
> --
> Michael Spencer                  Nova Scotia, Canada       .~.
>                                                            /V\
> mspencer at tallships.ca                                     /( )\
> http://home.tallships.ca/mspencer/                        ^^-^^
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