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"clearly" or the offerer doesn't know the rule ;-)

Bolts are only partially threaded, machine screws are fully threaded for metal working, end of.

My very serious concern about this (I used to run a business building lasers) is one of safety. If you doubt my concerns the go to Morrisons, buy a fish with eyes intact and try lasering an eye. You then need to decide to build this machine to class 4 or class 1. Review if the space you are...

Hertz have a pick up full and return full policy. I think that put me off their brand for EV when I was renting last

Do you really live your life based on "what if"? When the science is clear you really like to think, well what if gravity stops working for the week I want to go mountain climbing. Hard to fathom.

In the USA the Ford company bought them up and closed them down, in the UK the oil industry used finance to close them. This is not a level playing field, the planet haters have more money.

Not only is there consensus in the scientific community but there is consensus in the UN. Even the Koch brothers (deniers) hired some denying scientists to review the data and had to be informed, "it's real". The only people who don't believe either lack scientific ability or prefer to think...

The daughter of a friend is a Professor of Energy and Motorised systems (did her PhD on this subject) and says that the damage to battery ilfe issue is falling away as we get better at building them. Still if it were a problem in cars, how can they sell house batteries????

There is a logic that any office or business that employes staff using cars to get to work have to provide parking spaces and charging points. There are some pretty good papers on using office worker's cars as giant batteries (and at home) to help bridge variations in power generation. Rather...

Charging on streets is pretty normal around Europe with connections into lamp standards pretty common in Amsterdam, last time I was there. The technology for charging, connection etc is all developed. But in the UK it will be too difficult, as normal. I've been helping a local councillor...

Ok, let's knock some facts back Vehicle Duty should be around £650 a year if it were paying for UK roads. The difference is made up from Fossil Fuel taxes and VAT. Yes we need more electricity to support electrical cars, yes we are building more power generation units and a bunch of other...

Tall buildings are not that difficult Norway is home to the world’s second tallest timber building 18 storeys a few years back and this is only the second tallest building now. The question ought to be why are fire escapes made of steel. Wood would be better....

If you don't want to spend much money you might like to look at this unit which an Italian friend of mine just bought. It has two critical elements 1) a self leveling bed and 2) the movement at 32bits allows for precision movement. Other than that it is just as likely as others to breakdown...

as part of a Maker Space we use our 3D printers all the time. The Prusa model is very reliable and we have just ordered their very large machine 360x360x360 to compliment it. Everything from knurled knobs, to bandsaw inserts and T pieces for mitre gauges to table saw inserts. Use mainly PETG...

I don't think pre-tension is really there to solve whirl, I think it is to solve Euler collapse or at least Euler bending when the compressed part of the longest part of the screw moves out of line. Tension stops that screw getting into Euler bending and, of course, as a secondary result, stops...

One of our Maker Space members made one of those and the bits are still in the cellar. He likes the technology, but....

Those ideas certainly chime with my thoughts. A drawing would be wonderful, thank you.

Thanks, overthinking is what a Professional Engineer does. Yes, I've looked at different machines in the same "class" and noting any issues to do with the quality of the cut etc. I too think the H15 slideway will be good enough. In the past I've used 50mm and 30mm ball screws on aluminium and...

I use Danish oil on all my outdoor builds, it works well

it is a bit more complicated than that, it is a negotiation between cost, critical ballscrew rotational speed, top acceleration required, X and Z mass being driven, axis motor characteristics, quality of ballscrew set up. This is born out when you read home-builder's blogs as they keep running...