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Member postings for John Allan Watson Brown

Here is a list of all the postings John Allan Watson Brown has made in our forums. Click on a thread name to jump to the thread.

Thread: new to myford lathes
02/06/2016 11:43:01

Glad someone else has a ML4. Can you join or pop along to your local Model Engineer society? They would have machines to get your pulleys true again. You might even have a fellow member with our type of lathe and chat about the best way to fix this over a cup of tea?

Thread: Clear "plastic" rod
02/06/2016 11:37:43

Perhaps a flat plate type gauge would suit? It gets you away from the small bore tube difficulties. A lot more work involved mostly in the clamping bolts / screws to hold the press plates together over the clear lenses. Lots of images if you search "boiler gauge glass flat plate".

Thread: Lathe and societies.
02/01/2015 01:08:29

Ralph. In my mind the benefits to joining a local club are always going to be positive. Access to people with some or more experience and the odd loan of a tool your budget might not afford, is the main point of model engineering. Even if its a odd piece of advice because " I made one of those 20 odd year ago and ..." will stop you losing a work piece and could finish your project quicker. Like all social activities an individual might fail where a collective can win.

Thread: Engineering as a Profession
23/12/2014 14:39:12

Ady1. Totally agree. My ship now has a 'china' clone bridgeport mill and a nice big lathe. When I got there not only had the mill never been used from new (in five years). It had no tooling as nobody knew how to use it. I rescued the milling vice a big 8" vertex clone from the floor of the welding area. The full universal dividing head was stuck in a cupboard with the gears. I have taken some cutting tools on board and made some things to show the Fitter / Welders how do make stuff. M24 stainless steel castle nuts last trip. 8 lobe plastic drive coupling spiders trip before that. First job I had to made a drawbar, 7/16" UNF for the R8 tooling on the mill at my house and take it to the ship. I started in Leith shipyard and a marine fitter apprenticeship. I despair at what will happen at sea when the old guys retire?

Thread: Electronics Engineering Project
21/10/2014 00:35:12

The idea is already out there, sorry. They are AUV and I was on ships that launched them. See this site for an example.

http://www.km.kongsberg.com/ks/web/nokbg0240.nsf/AllWeb/D5682F98CBFBC05AC1257497002976E4?OpenDocument

Try a project in a field, which you have a actual interest in. If you like music then a autonomous band playing actual instruments, if you like politics a vast autonomous fan that blows hot air ever where to no effect. you get the picture. Good luck my Thesis was about ECA, Embodied Conversational Agents.

Thread: New or Old?
08/02/2014 10:51:40

This is a great question. Remember in work holding the quality of the vice tends to give you a certainty it will not move or distort the piece you are machining. I mistakenly bought a "cheap" machine vice, when I started and even with a bit or work on it, found it not good quality. It has sat on my pillar drill since. If you are like me and machine as a hobby but require precision, our work holding machine has to be the best quality we can afford.

Thread: Good workshop lathe
06/07/2013 09:27:31

Welcome Joe.

You have started a ball rolling here. Your own interests will be the key I think. If your intentions are for small models and clocks you are not going to require a large diameter swing or longer bed. After this your man cave or workspace will physically limit your Boxford choices. I assume that your CL500 is to be replaced by your new Boxford? I had a smaller space and started with the CL250 and have graduated into a new workshop adding a Myford ML4 which is big enough for clocks and small models. I'm not building a railway here. I added a separate mill machine, as my CL250 had the add-on mill stand. You may have had one on the CL500? I recommend this action. Enjoy the search for your perfect machine anyway and good hunting.

John

Thread: Something a little different from the day to day ME
11/02/2013 21:10:41

I spend the first 11 years of my life watching these engines jump up and down. Started as a 6th Engineer Officer. Olly is right the engine reversed after stopping, using air starting valves. 380cst heavy oil fuel was the usual fuel until we arrived at port, where marine diesel was mixed and took over for manouvering. Getting via the panama and suez canal was tedious control work. We used to carry out our own maintenance, so we seen the fine machining work shown in the picture galley first hand. Side piston top end bearings were the worse to open for inspection. In ports around the world, we started at 8AM and removed both pistons from the cylinder, cleaned and check the wear down readings inside the 760mm or 670mm bore and returned it to running condition before 4PM. Ready for shore leave. Now I start these "little" medium speed diesels using a mouse, watching a monitor. We shared the same space with these engines as the controls were beside the engines. We still get to go inside the engineroom to look at the engines but its not the same as staring at the 6 top pistons of a Doxford beating up and down a full speed. Thanks for this link Bazyle. I better get back to work we are close to Aberdeen.

Thread: Parallel turning on a Myford ml4
09/01/2013 09:10:49

Hello ML4 club members. My machine is D2017, which I recently bought from a club member. I have only just finished setting up my workshop and your post has prompted me to reply. I carried out the rollie's dad method of lathe alignment and after some adjustments I am happy with the accuracy. I checked against any potential twist using a fancy new electronic level device when I fitted the lathe to its bench top. I am lucky to have the adjustable type tailstock. Which I found, after checking had been offset to parallel?

My method to overcome the register diameter issue was a internal bush fitted inside a new purchase ML7 backplate. This allowed me to use the three jaw chuck that fitted the register and a four jaw chuck was fitted to the new backplate with its internal register now at 1.125". I will most likely do the same for any other backplates I get in the future.

Somebody once said there is life in the old dog yet. For our venerable lathes this seems to be the case.

Thread: Longcase movement
07/04/2012 07:03:42

I purchased wheel and pinion cutting in horology, J M Wild FBHI. ISBN 978-1-86126-245-5. That shows a wheel cutting engine from 1670. I recommend the book for the insight into cutting your own wheels and pinion. I am building Mr Parslow's 15 day skeleton clock at the moment. As an absolute beginner, engines or a exact method to cut the teeth are the major issue. With brass the price it is getting it wrong on £5 worth of blank brass gets me all wound up.

Thread: Bore and stroke ratio in steam engine.
23/10/2011 14:31:49
Your question had me get out my old books. From my Sotherns verbal notes for Marine Engineers (7th Edition, 1911) steam expands in a cylinder of a reciprocating engine approximately hyperbolic or Isothermal. Turbines it is Adiabatic. Your expamples are single cylinder but as others have mentioned compound or triples (or Quadruples) which drop the temperature in stages for efficiency. I have examples in the text book of this calculation. Steam is delivered saturated or dry, which will give different indicated horse power (I.H.P.) than wet steam or superheated steam. Superheated steam gives a rise in temperature and you get increased pressure for a constant volume. So your question of work done from each example is dependant on several factors not just the physical volume of the stroke. These other factors as shown in above posts inlude cut off, heat drop and clearance volume. Power is work done in a given time so I.H.P. is equal to 33000 lb raised 12" in 60 seconds. Heat drop is usually allowed at 1 B.T.U. for each 778 Foot-Poundsof work done, where B.T.U is British Thermal Unit. Shaft horse power (S.H.P.) is the useful measure of delivered power not I.H.P. Rough ratio is S.H.P. = I.H.P * 0.9. Sorry about giving 'old school' measures but I couldn't find my metric text books yet. So what steam pressure and its condition prior to entry of the cylinders is of more importance to calculate the power output, so get a better boiler than a bigger bore. Sorry if I have bored anybody.
Thread: LMS Whistles
08/09/2011 15:52:55
I found this whistle site.
http://www.fonema.se/whistle/hotwhiz.html
What I liked about this site was the practical and the science behind the design. Hope you find a way to correct the pitch for your own tube.
Thread: Harrison L5
03/09/2011 21:50:14
If you can unscrew these nipples then just take them off. Clear the holes and the nipples manually with a fine pointed scriber until you can get oil through. Replace and tighten up the nipples again and only use oil after this.
Thread: Small Steel Boilers
24/08/2011 20:59:46
Has anybody seen the article in engineering in miniature, July 2011 issue page 20 by David Beale? Steel boiler made from certified fittings. It is a rather large scale boiler, of an approved design from the Steam Boat Association (SBA). I have used the steel butt weld fittings on ships pipe work but for a boiler, as the threads have stated a qualified welder is required to comply with the inspector.
Thread: which mill and lathe ... advice please if poss
25/05/2011 11:16:02
One excellent source on making small boilers and engines I can recommend is Building simple model steam engines by Tubal Cain a.k.a Tom Walshaw. You will find it easily either Amazon or Tee Publisher. This is a little treasure trove of small boiler making tips and instructions. 4 projects are included and I am working my way through these just now. Look up the internet on "make lathe gears easily" for one way to cut gears. The best lathe is one that can fit in your shed and still have room to work There is plenty of good threads on lathe purchase pros and cons. Hope you enjoy this new hobby I am.
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