Member postings for Russell Eberhardt

Hydrogen isn't an energy source unless it is being used in a fusion reactor which isn't yet practical. Hydrogen is used for energy storage. As far as renewables are concerned try reading "Sustainable Energy - without the hot air" for a scientific approach by Prof. David MacKay FRS.

Russell

Interesting discussion on the merits of local backups vs. cloud with regard to Onshape:

**LINK**

https://forum.onshape.com/discussion/1115/how-can-i-archive-a-local-copy-of-a-model

Russell

The Cloud = Someone Else's Computers with a strong backup regime. Probably more secure than your computer. However I do both.

How to make local backups from Fusion 360:

**LINK**

https://knowledge.autodesk.com/support/fusion-360/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-make-a-local-archive-back-up-file-in-Fusion-360.html

Russell

That is, of course, just a personal preference to which you are entitled.

Some here are profesional engineers working for money, some are cheque book engineers, and some are hobbyists. Each to his own.

Russell

Why not just build one of the many designs for a four facet drill grinding jig? Four facet works nearly as well as split point, is much easier to get right, and doesn't need a sharp corner on the wheel.

Russell

If you want to test domestic appliances the general test required by the safety standards is a flash test of 2000 V for equipment with an earth connection and 4000 V between mains and any exposed metal parts for equipment without an earth connection.

Russell

Brass was traditionally used for frames and wheels for the simple reason that the friction between brass and steel is low. Modern precision clocks often use unlubricated minature stainless steel or ceramic ball bearings for the pivots so you could take that approach and use aluminium or stainless for the frames. The wheels however usually run against steel pinions so it's probably best to stick to brass there as, although the action is mainly rolling there will inevitably be some sliding at the teeth.

Russell.

Clockmakers and jewelers have been cutting such thin brass parts by hand for centuries. The tool to use is a piercing saw. Explanation here.

http://dave-cushman.net/bee/piercingsaw.html

Russell

Those tools are not likely to be cobalt but a grade of HSS that contains cobalt such as M42. A somewhat superior grade of HSS. It has better high temperature performance than the other grades and can work well when red hot.  Not likely to be important in the home workshop!

Russell

Edited By Russell Eberhardt on 14/12/2018 14:48:54

Just for a bit of balance; I had a Chester 920 lathe for a couple of years as a second lathe and found it to be accurate and easy to use. It certainly had none of the faults you highlight. It was, however second hand and possibly fettled by the previous owner.

I eventually sold it needing the space for a cnc minimill, keeping my old British made Acorn/Atlas. I kept that as I found the simple screwcutting gearbox rather limited in the range of threads it would cut compared with the change wheel selection on the Atlas added to which I had made a greater range of dedicated accessories for the Atlas.

Russell

Half centre enables you to get the tool closer to the centre of the work. I don't often use my live centre. Keep the centre well lubricated to prevent wear.

Russell

Try Clockmaking brass

Ian supplies the correct grade of brass cut to your requirement in rectangles and circles.

Russell

It's always too easy to blame someone else.

Russell

Who will independently judge the validity of the proof?

Russell

Neil, I think Ian's post was tongue in cheek. He has been around on this and other forums for many years.

Russell

Had experience of poor NHS treatment for back pain and having to pay for good private treatment. Now, living in France, when my back plays up I just go to my GP and he gives me a prescription for Kinestherapy (physiotherapy) and I go to a local man who does massage for pain control and manipulation combined with exercise to treat the cause twice a week for 15 sessions repeatable if necessary. All free of charge

Russell

Beware of drugs that mask the pain. The pain is there as a warning. If you ignore it you may do further damage. Don't ask me how I know.

Better to try physiotherapy, osteopathy, or chiropractic whichever suits you.

Russell

Be very careful doing that Jason. In particular don't twist while lifting. I did something similar in my 30s and damaged my back. Now, in my 70s I'm having to have physio twice a week for back problems.

Russell.

I wouldn't use EN3B for a thread. Try some good free cutting mild steel with a really sharp HSS tool.

Russell

Lead fishing weights up to 28 g are already banned in the UK; https://www.legislation.gov.uk/uksi/1986/1992/made

Russell