| Sysop: | Amessyroom |
|---|---|
| Location: | Fayetteville, NC |
| Users: | 43 |
| Nodes: | 6 (0 / 6) |
| Uptime: | 96:16:41 |
| Calls: | 290 |
| Files: | 904 |
| Messages: | 76,426 |
...
Did the US gold mine elevator accident have any effect on your mining
museum activities? I was careful to limit what I suggested. ...
"Richard Smith" wrote in message news:m1froyjvq9.fsf@void.com...
Yes - I crossed the Tamar from Devon. Very loaded issue.
----------------------------
One Tamar bridge has a unique design: https://www.networkrailmediacentre.co.uk/news/brunels-royal-albert-bridge-unveiled-in-all-its-splendour
The upper arch expands under load, the lower one contracts and cancels
the upper's end thrust, thus the supporting piers can be quite narrow
and the abutments curved to match the track right-of-way.
"Richard Smith" wrote in message news:m18quqowx8.fsf@void.com...
The value to society of seeing where our forebearers scraped a living is
so very very high.
So the risks while known are accepted. Someone somewhere will be in the wrong place at the wrong time - but to lose contact with forebearers and continuity is a "no way" for our societies. ----------------------------------
I live in a somewhat sparsely populated hilly to mountainous state next
to a flat highly urban one whose residents flock here for vacations.
Over the weekend the TV ran a warning that hiking in the mountains
requires more cold weather preparation than many arrive with, being used
to always having warm indoor shelter nearby. Specifically, don't climb
in October wearing sneakers or even shorts and sandals. Crosses mark
where hikers froze to death in July. Several times I've seen mountain
hikers very poorly prepared for the arctic wind and cold and deep snow
at altitude while it's sunny and warm where they parked, a few miles
away. While descending late in the day in January, equipped as for Mt Everest, we met and escorted back a group of teens struggling uphill
through the snow in light jackets and sneakers. Another hiker and I made winter gear and were testing my goose down parka and his snowshoe
climbing grips.
NH mountains aren't particularly high but their weather can be similar
to northern Labrador. We don't benefit from Gulf Stream warmth as you
do, we get Norwegian cold (-20C) at Italian latitude (42N). Our
urbanites have become used to thinking that the world is safe and not
staying alert or taking precautions.
"Richard Smith" wrote in message news:m18quqowx8.fsf@void.com...
The value to society of seeing where our forebearers scraped a living is
so very very high.
So the risks while known are accepted. Someone somewhere will be in the wrong place at the wrong time - but to lose contact with forebearers and continuity is a "no way" for our societies. ----------------------------------
I live in a somewhat sparsely populated hilly to mountainous state
next to a flat highly urban one whose residents flock here for
vacations. Over the weekend the TV ran a warning that hiking in the
mountains requires more cold weather preparation than many arrive
with, being used to always having warm indoor shelter
nearby. Specifically, don't climb in October wearing sneakers or even
shorts and sandals. Crosses mark where hikers froze to death in
July. Several times I've seen mountain hikers very poorly prepared for
the arctic wind and cold and deep snow at altitude while it's sunny
and warm where they parked, a few miles away. While descending late in
the day in January, equipped as for Mt Everest, we met and escorted
back a group of teens struggling uphill through the snow in light
jackets and sneakers. Another hiker and I made winter gear and were
testing my goose down parka and his snowshoe climbing grips.
NH mountains aren't particularly high but their weather can be similar
to northern Labrador. We don't benefit from Gulf Stream warmth as you
do, we get Norwegian cold (-20C) at Italian latitude (42N). Our
urbanites have become used to thinking that the world is safe and not
staying alert or taking precautions.
"Jim Wilkins" <muratlanne@gmail.com> writes:
"Richard Smith" wrote in message news:m1froyjvq9.fsf@void.com...
Yes - I crossed the Tamar from Devon. Very loaded issue.
----------------------------
One Tamar bridge has a unique design:
https://www.networkrailmediacentre.co.uk/news/brunels-royal-albert-bridge-unveiled-in-all-its-splendour
The upper arch expands under load, the lower one contracts and cancels
the upper's end thrust, thus the supporting piers can be quite narrow
and the abutments curved to match the track right-of-way.
I pass that, the Saltash Bridge, travelling back to Devon of I go the South-of-Dartmoor route through Plymouth.
From the road suspension bridge the 1850's Brunel railway Saltash bridge
is alongside.
It is a spectacular sight.
Many Brunel solutions are very special - there is a clean rationality to
the design, as best I can put it.
Regards,
Rich S
"Richard Smith" wrote in message news:m1a5d7bsh1.fsf@void.com...
I have contributed - this has started to happen. I used "the bubble" (spirit-level) on some fabrications, and found that what it cost in time
to set things off parallel at the first stage was more than made-up for
by the "ideal" time it took to fit-up and weld the rest.
Show the approach and the corrections, the owner and designer where on
the press-brake with dial-gauges, etc., and made adjustments.
ie. there is something positive going on. ...
-------------------------
Could you expand on that?
I found out the hard way how much welds can distort a precise
alignment, especially a weld across an inside corner. I had to jack
the sawmill ladder frame parallel (enough) and mill the shrunken gap
in a bending brake hinge assembled from surface-ground plates. The
surface welds along the sides of the plate stack didn't destroy the
0.005" fork/tongue clearance, but welding inside the fork did.
Do diagonal or fish mouth/tail ends (vs square) improve stress
distribution and/or reduce distortion in butt joint splice plate
welds? One end of the splice plate would be bolted, the other welded
after aligning the beams.
When I was building custom machinery the press brake operator and
welder compensated for distortion, the all-welded machine frames were
square to 1/32". They were mostly multiple 19" relay racks that we had
to fit the equipment panels into, so we would see any error. I knew
they marked the prints with allowances for bending and welding but
they didn't share, and the front surface welds had been ground and
filled as invisible as auto body repairs.
tia, jsw
"Richard Smith" wrote in message news:m1jzc6u3ox.fsf@void.com...
"Jim Wilkins" <muratlanne@gmail.com> writes:
Bending / welding allowances
You are well ahead of me. i doubt i can help.
Press-brake - they have a press-brake, yes - good.
Not new when bought. Is small "fabco.".
Seeing if corrections / calibrations needed to go in to the settings,
I think.
--------------------
Bending allowance can be determined by bending a small test coupon and measuring the resulting lengths. I've seen welders hammer the cooling
beads but my night school training didn't cover that aspect, it seemed
to be done by experience and judgment instead of pre-planning.
A practical example is welding a repair in a curved fender. A patch
dished to copy the existing fender shape will flatten from weld
shrinkage. If there's space behind, like on my pickup truck bed, I can restore the curve with a hammer and dolly, but the integral steel
inner wheel well on the car blocks access for a dolly so if it had
antique value I'd need to preform the patch 'somewhat' deeper to
compensate, or build it up with filler.
jsw
"Jim Wilkins" wrote in message news:vjhbbh$3e2nh$1@dont-email.me...
The valuable equipment is a lathe for power transmission components and a vertical mill for the static structure, plus a horizontal bandsaw to cut stock.
...
"Jim Wilkins" <muratlanne@gmail.com> writes:
"Jim Wilkins" wrote in message news:vjhbbh$3e2nh$1@dont-email.me...
The valuable equipment is a lathe for power transmission components and a
vertical mill for the static structure, plus a horizontal bandsaw to cut
stock.
...
I'd like to have a lathe again for sure.
When I was a youth I had no connection to anyone familiar or who could
mentor me.
Now I have been involved in a lot of commercial manufacturing operations
and done a fair amount of machining.
With landing-down here, might soon come time to look at this - getting
some machine tools.
I liked the freedom at small companies that allowed me to expand into functions they didn't have. Usually I ended up responsible for all
aspects of custom product creation, electrical, mechanical and
software, after I had proven able to handle them. Symbolic of those
companies was a note for the last one out to please lock the door, the
job was interesting enough to work late.
The downside was their high failure rate, at times from lawsuits by
less successful competitors. I was un- or underemployed during
economic downturns when startups folded and R&D investment dried up. I learned to live very cheaply, cutting firewood for heat, maintaining
the house and car and using free antenna rather than expensive cable
TV. That's why my Internet access is somewhat limited, right now to
10GB of tethered cellular per month. In those times I was free to
scout auctions etc for good deals on orphaned lab test equipment and
metal shop machinery.
"Jim Wilkins" <muratlanne@gmail.com> writes:
I liked the freedom at small companies that allowed me to expand into
functions they didn't have. Usually I ended up responsible for all
aspects of custom product creation, electrical, mechanical and
software, after I had proven able to handle them. Symbolic of those
companies was a note for the last one out to please lock the door, the
job was interesting enough to work late.
The downside was their high failure rate, at times from lawsuits by
less successful competitors. I was un- or underemployed during
economic downturns when startups folded and R&D investment dried up. I
learned to live very cheaply, cutting firewood for heat, maintaining
the house and car and using free antenna rather than expensive cable
TV. That's why my Internet access is somewhat limited, right now to
10GB of tethered cellular per month. In those times I was free to
scout auctions etc for good deals on orphaned lab test equipment and
metal shop machinery.
I am feeling happy at this place.
It is hard to predict what the future will hold. I can only hope that
if things turn difficult in ways which seem possible (I am in Britain),
local manufacture will be favoured.
"Richard Smith" wrote in message
news:m1v7vd4guz.fsf@void.com... There was a phone call received from
an installer at site which was
essentially "What's going on? Everything fits!".
That was when what I made had gone by the galvanisers and began arriving
at site.
--------------------------------
Were you let go for embarrassing other designers?
