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Sep
30
answered How can I 'share' lights between multiple circuits?
Sep
21
comment Is this swing beam safe?
The deflection or strain is not what you should be worried about. Rather, you should be worried about catastrophic failure of your structure which can occur even without visible strain. In other words, deflection is not a good indication of impending structural failure at all.
Sep
21
comment Is this swing beam safe?
Those "standard load calculations" you are using are almost certainly for a static load and aren't applicable to the dynamic loading that a person on a swing would subject the beam to. Tables for dynamic load must exist somewhere for there are plenty of wooden bridges that support the dynamic load of cars crossing. The static load calculations you used, however, won't tell you much about failure under dynamic load.
Sep
3
comment Home security sensor for windows
Answer: You need magnetic contact switches mounted such that they detect whether the windows and/or louvres are open or closed. That way your alarm panel can enforce that they are closed. Judging from the picture you'll probably have the best luck with this surface-mount style contact.
Sep
3
awarded  Nice Answer
Aug
4
awarded  Yearling
Jun
10
comment Vibration dampening solution to stop extractor fan / dishwasher vibration?
Based on your description, I don't think there is a practical way to isolate your bed from the vibrations. It is notoriously difficult to isolate a room from low frequencies. This is why physics labs and recording studios are often built on massive concrete floors at or below grade; they rely on the overwhelming inertia of the floor to prevent vibrations from transmitting through it. Because the mass of all floors except the bottom has to be supported by the building's structure, they tend to be light enough that equipment can transmit small amplitude vibrations into them.
Jun
10
comment Vibration dampening solution to stop extractor fan / dishwasher vibration?
Is your bed in the middle of a large unsupported span of floor? Floor-joists in wood-framed buildings have vibration properties similar to guitar strings -- they have a resonant frequency, and the further you are from the support structure, the larger the amplitude of the vibration. The last building I lived in had a section of floor with a very noticeable 5 to 10 Hz resonant frequency. The washer would induce vibrations. The point is, if you move your bed adjacent the walls that support the floor, the amplitude should be smaller.
Jun
10
comment Vibration dampening solution to stop extractor fan / dishwasher vibration?
That's pretty low frequency to isolate using mass-on-a-spring isolation. The springs would be rather large and expensive. You'd also need damping if you went that route because you'd have a natural frequency in the single-digit Hz range that you'd excite just getting into bed.
Jun
8
comment Vibration dampening solution to stop extractor fan / dishwasher vibration?
You say it's not audible. How, exactly, does it disturb your sleep? Do you feel it? What does it feel like? Like being aboard a ship? Or more like riding a bus on an uneven road? To determine whether it's practical to do something about it, it's important to determine the frequency of the vibration.
May
29
comment What is difference between BTU and MBH for house furnaces?
mille or mil means thousand in at least French, Italian, Portuguese, and Spanish.
Dec
27
awarded  Necromancer
Dec
17
answered Multiple weak light bulbs vs one strong light bulb
Sep
8
comment How can I run Ethernet cabling through concrete walls?
"Concrete walls typically have conduits where all wiring passes." There is a lot of construction where electrical cables are cast into concrete without conduit. I think that statement is rather misleading.
Sep
8
comment How do I fix this leaking dishwasher drain pipe?
A picture of the problematic hose would really help narrow down the possible solutions.
Aug
4
awarded  Yearling
Jul
10
comment How can I consolidate different heating/cooling systems into a single system?
You could probably configure a unified controller using gear from Easy IO. I haven't used that brand myself (but have come close), but it has been recommended to me by an industrial HVAC engineer as "can control anything, easy to program, and reasonably priced."
Jun
19
reviewed No Action Needed Should I reorganize the main service panel when adding a subpanel?
Jun
19
reviewed No Action Needed How do I meet the 7 feet high ceiling requirement after finishing the basement?
Jun
19
awarded  Organizer