Recent content by sophiecentaur

Not straightforward because you seem to assume that the impact is instantaneous. Most practical situations involve a finite time of contact during which there may be motion of object and target or distortion of one or both. Very often a suitable method would be based on Energy, rather than...

You have the necessary info about the lens and the laser. What you need is practical advice for the 'under-tooled'. If you had some modest machine tools then you'd do this easily. But, as I have already pointed out, you haven't shown us the actual problem. I wonder why.

I'd bet that ChatGPT uses PF as a source for 'good ideas'. It has to get them somewhere as it has nothing of its own to give.

There's another very annoying fact. To do a full restart on a rad valve you have to start from scratch and re-progrmme its daily schedule. That Hive App could very easily store a schedule and load it back into a re-started rad valve. I could continue ranting on but, as there seems to be no one...

A totally personal choice, of course. For anyone to help you get to your goal you need to describe the problem exactly. The easiest solution would almost certainly to have been to buy a cheapo laserlevel. Now you have spent $40 on your posh lens, you are pretty well forced to use it. Also, a...

I did go through this loop a bit and found that Pairing of Rad to Hub is reluctant. Whether that 'pairing' refers to Bluetooth or Zigbee, I don't know The hub is connected to the router with ethernet so I don't think WiFi can be to blame. Also, on occasions, if I make a change in the app, a rad...

What are you worried about here? If alignment is that critical then you need a very stable connection not glue, though. You have shown that holding the parts in your hand is difficult so coaxial mounting is strongly indicated. You haven't yet posted a picture of your laser so I am totally...

I would say that the laser and lens should be fixed together and the laser should be supported by a single fixture to the tripod. If you can support the laser in a plastic tube and then use a smaller tube to hold the lens. There are various mounting brackets for camera tripods - you'd need to...

Dat's mah boy. Brilliance and arrogance often go together - but where would we have been without him?

I guess this post is mainly aimed at UK members because I think my particular query is about a particular product range. I have a Hive Heating control system with 'smart' TRVs and a single radiator which is controlled by a wall thermostat. The system is controlled by a Hub with connection to my...

Literal blindness is unlikely here but patches and streaks of damage on the retina are more possible.. Things can 'disappear' for your visual experience. OTOH, gazing at the Sun can really Rodger your sight. Didya know that ancient navigators used to go blind in one eye after a short career...

Wow, that looks expensive. Going down that route could be the thin end of the wedge. I would suggest buying a 9mm drill and use it to make a hole in a piece of wood and mount it there. A sleeve of card )or something equivalent) would avoid spoiling the (nice) Powell lens with glue

Very relevant in practical transport situations. mpg is very much affected by Tare Weight. Most of the energy for a passenger train is used just to get the loco and coaches from A to B.

You need to consider the whole system if you want to discuss efficiency. The appliances in your home are specified to work at a certain Voltage and to use a certain amount of Power. That requires a certain value of Resistance. (R = Vsquared)/P).The supply cables always have some resistance and...

The ratios are only approximate, though. Sneaky.