|Martin King 2||19/09/2020 17:57:24|
|717 forum posts|
I heartily endorse Brian Woods comments above!
I really enjoy your threads and expertise as a complete newbie at all this stuff
Also many thanks for you know what!
|Oily Rag||19/09/2020 18:30:23|
161 forum posts
I join in the praise given above for your depth of knowledge and experience. Your posts are always a delight to read being well written and concise. I shall be sorry not to read your valuable inputs in future. Get back when you feel the need after earning some wonga!
Stay safe and drop by every now and then.
|noel shelley||19/09/2020 19:01:26|
|116 forum posts|
Andrew, as one of those who has been helped by your advice, firstly thankyou. As one who has to earn a living I drift in when time allows, then may not be seen for months. I hope you will be back, when you have time. Best wishes. Noel.
|Andrew Johnston||21/09/2020 11:55:37|
5657 forum posts
Thanks for the encouraging replies. I've also had some PMs and a couple of 'phone calls, in one of which I was smacked round the head and told to stop being an idiot.
The plan is now to take a break and concentrate on the paid for work that is finally coming in. After that, like it or lump it, I'll be back. I will still be reading, and responding to, PMs. The timing may be slow though, as for reasons never explained I no longer get an email to say I have a PM waiting.
I'm not entirely abandoning the traction engines and other engineering. There are three main tasks upcoming:
1. Collect the set of wheels from the rubber tyre company and get the second engine on it's wheels.
2. Re-design the safety valves to be pop types.
3. Understand the maths and see if I can create a 3D CAD model of a spiral bevel gear. If I can model it then I will be able to 3D print and/or machine it.
328 forum posts
That sounds like a better plan Andrew.
|96 forum posts|
good on you andrew, i have been following your traction engine build for a while now
|352 forum posts|
|Andrew Johnston||22/10/2020 23:48:29|
5657 forum posts
The astute reader may have noticed that I've been posting again today. Like it or lump it I intend to continue.
Regarding the tasks mentioned above I now have the wheels for my traction engine complete with rubber tyres:
I'm very pleased with the rubber tyres, less so with the rust from the vulcanisation process. I've got rid of a lot of it with wire wheels and a drill. But I've also bought a cheap blast gun and some garnet grit to get rid of the rest.
The safety valve design is on hold.
I now understand the basics of spiral bevel gears and also the difference between involute and octoid tooth forms. So it's now a case of modelling something I can 3D print and then machine.
A further distraction has occurred. Following discussions on the MEM forum I have found some old notes on the internet on the design of skew bevel gears. Of course I am aware of the work by Kozo. But I think his designs are based on hypoid gearing and the tooth profiles are significantly asymmetric. If one looks are drawings, and photographs, of the logging locomotives that used skew bevel gears the tooth forms are symmetric and look like straight tooth bevel gears. The design notes I have found use symmetric tooth profiles as per the full size engines. So I plan to model same in CAD and 3D print them to see if they work.
Talking of work I am now working for the first time in ten months and have been dragged into the 21st century with Zoom meetings for the first time this week. Work has to take priority as the savings are depleted. And we have a reputation with the client for delivering late so we absolutely have to deliver what we say, when we say this time. I am now delving into electrochemical gas sensors, potentiostats and transimpedance amplfiers, although given the large effective series capacitance in the sensor the output amplifier is more like a differentiator, complete with all its noise problems.
3859 forum posts
1487 forum posts
I spent many years installing instruments in the Electro chemical industry. ICI . Lindsey oil & some chemical plant in Ince, Chester. No idea what they were, i just installed them.
Good to see you are still around. Chin up & get grafting.
|96 forum posts|
good to see you back, gary
|1275 forum posts|
Andrew, I'm glad you are back and I am looking forward to reading your posts again.
|Brian H||23/10/2020 08:47:09|
1794 forum posts
Glad that you're back Andrew.
|Bob Lamb||23/10/2020 09:28:57|
127 forum posts
Andrew, I enjoy reading your posts and have learnt a lot from them. Present times are pretty crazy and may well get worse before Christmas - I think we may all be getting a bit fed up with things. I hope you will reconsider your decision - slow down a bit on the posts but don't leave us all without the benefit of your knowledge. Hope the work goes well and look forward to seeing some more posts at sometime in the future. All the best - Bob
|Chris Evans 6||23/10/2020 09:32:36|
1744 forum posts
A very warm and sincere welcome back Andrew. I always valued your knowledge and enjoyed reading your posts. Chris.
|879 forum posts|
Welcome back Andrew!
|Nicholas Farr||23/10/2020 12:02:24|
2438 forum posts
Hi Andrew, your rubber tyres look really good and the wheels are good also.
|John Alexander Stewart||23/10/2020 18:30:47|
|776 forum posts|
I seem to remember reading that the Climax gears were hand-made wood patterns, then cast. i.e. not machined.
Although having seen about 1/2 dozen of them, I can't say that I looked that closely! The other 2 (Shay, Heisler) are more interesting, IMHO.
Kozo gives us a way to machine gears good enough for his model Climax, machining on small machines in the average workshop, so I give him top marks.
Yes, it is good to see you back posting; hope the flying stuff is also going well. Cheers from Canada!
|Andrew Johnston||23/10/2020 21:47:51|
5657 forum posts
Thanks for the welcoming comments. Looks like I've made the right decision to return. As before I'll have a few informal rules about posting. Some electronics threads in the past got a bit heated, so I intend to generally stay clear of electronics. It's my profession, not my hobby, so I have an approach to design and debug which probably isn't appropriate here.
Inevitably in the current panic there have been a lot of posts recently about import machinery, the pros and cons and what are best buys. I've never used any import machines and know nothing about them, so I will be steering clear of such threads. That's not to say I won't comment on machining issues involving said machines; the cutting process is not machine dependent.
1487 forum posts
I am pretty much the same as you there Andrew. See lots of questions about eastern machines & never having owned or even used one, better just read the posts.
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