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Member postings for ian weeks

Here is a list of all the postings ian weeks has made in our forums. Click on a thread name to jump to the thread.

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Thread: benchtop power supply
16/09/2011 19:26:10
Dear All - following on from 5 minutes ago ??just use 24v for both circuits and adjust values of components before lm317 ?? I would probably get calcs wrong!-Ian
16/09/2011 19:12:37
Dear All ,
Thank you all for your advice and help . Cruised past Maplins today and just had to stop. Between them and bits in the shed and attic nearly enough to make a start . the trouble is the reading and thinking bit is fun!! I have had a look at the 'stennings' circuit diagram and the LT circuit looks a goer for the required 2v[by adjusting the resistor values across the lm317]. Having taken on board your comments about the ht circuit and having 230v twin 24v output and 230v twin 18v output transformers in the spares [come in handy one day box] is the idea of using one of these as a 'step' up from the 15v seecondary winding a starter as per your earlier suggestion rather than the straigh't voltage quadruple' circuit shown? A. bearing in mind I'm a tyro and B. I would love to understand the voltage quadrupler circuit but don't [ Am on amazon for a more modern primer tonight].also just thought If used 24v transformer totally seperately wouldn't that get me pretty damn near required 138v using quadrupler circuit-- then drop it -feel free to shoot me down in flames.
Thanks again Ian
Oh And another project has arisen -Have had a chester e30 mill for 2 years lovely little machine little use as I mainly use my Theil but noticed an irritating jerk on the x axis when milling My friend came round tonight and helped me remove table- no wear on screw or nut or tangential gibs -all pristine BUT would you believe the machined feed screw nut has no positive location just 2 capscrews wich allow lateral movement no locating peg or key -nut thread pristine - looks like a big job to provide a positive location for the nut and or a longer acme thread cutting and milling new purpose built nut. The words ship and ha'pence o' tar come to mind !!-- Ian

15/09/2011 08:31:38
Thanks Steve , just read the posting and I am getting Quite fired up at the thought of having a go . will be a few weeks yet before I have enough spare time but the preparation and reading will be fun.Slowly but slowly the nuts and bolts are coming back. The only problem is explaining to my wife why I'm not concentrating on getting the steam engine prepared for the church christmas fair Santa Specials!! If [when] I run into questions I know I can count on everyone for extremely knowledgable advice---Ian
14/09/2011 15:21:14
Thanks everyone , I I think I follow steve and les' postings. Un fortunately I boobed in my first posting and referred to a 'bush' that is actually the old bush ac11 which is at my bedside having got in going about 10 years ago - even wife allows it as it's cabinet is lovely wood! The battery job is an eko b53 !!--sorry ! [b53 135v/2v bush 90 or so /1.25 ]Had intended to do a bit on the gear box I'm slowly making for the myford tonight when I get home but think I'll spend the time looking at the links mentioned and probable re -reading my old electronic primer- I think I know whereabouts it is in the attic!!!!!!!!! Thanks chaps -the avenues which one ends up going down are what makes this hobby so interestin regards Ian
13/09/2011 22:43:48
Thanks les for the information and sorry about the delay in replying. had a good look at the old radio tonight and some stuff I had got together a few years ago in preparation for having a go at it . I did find a schematic for a power supply on the uk vintage radio repair and restoration website but it was for a 90v ht and 1.35v lt supply .it used a 'voltage quadruple circuit' which I didn't undersatand so put it to one side for a long winters project
The radio I have is 135v ht and 2v lt
I will need to spend time relearning stuff I must have Known 40 odd years ago! ,or perhaps you know of a website that would have a ready made circuit diagram?
Kind regards Ian
11/09/2011 21:57:26
Thanks everyone for the information and entertainment .Steve is right I do have another little project in mind . Years ago a friend gave me an old bush battery valve radio which he was about to throw out . I just couldn't let that happen. It's been at the back of the workshop staring at me for some time Before I can even look at it I would need Batteries [not made anymore] or a power supply . When read the MEW article I thought If I can cobble The bench power supply together, Will have new supply for mill table feed /useful 5v if ever needed and its not a world away from HT/LT supply to play with old radio and stop it staring at me.
Also I think I know that lathe in the photo -is it outside the foundry at the Ironbridge equivalent of Beamish by any chance??
Regards Ian
10/09/2011 10:01:44
Dear Steve ,
Thanks very much for your advice and prompt reply.Its nice to get a bit of confirmation that not all the grey cells have gone. Also did wonder about the heat dissipation and bought heat sinks as you suggested. Thanks again Ian
09/09/2011 23:31:52
Dear All,
whist building the gear banjo in MEW issue82 I once again read the article in the same issue by peter rawlinson on electronics in the workshop. It took me back to the 'radio and electronics club at school many decades ago.
I resolved to build the project at the end of the article as a 'nostalgia trip'.
However I have a problem -the circuit shows 4 of the capacitors as 10 microfarad 35vw but the pictures show one of these as a physically much bigger beast of an electrolytic[ viz the one across the output of the bridge rectifier]. My problem is that a little bell is ringing in my head and saying that this capacitor should br bigger but my knowledge is so rusty I cant be sure and I can see no corrections to the circuit inn subsequent issues.
Any advice would be appreciated
Regards Ian
Thread: sine vice
19/07/2011 21:14:29
Dear Nobby,
Sorry for the delay in replying. The vice is a fantastic inspiration. When I return from holiday I shall certainly set about trying to replicate your work. As self taught i 'm not sure I can equal your workmanship but I intend to give it a go!
As an aside ,have you thought of writing up your efforts for a mag I certainly find efforts like this inspirational - regards again Ian
16/07/2011 00:12:27
Dear John ,
Thank you very much for posting the link . It looks most interesting and as I'm off on holiday in afew days on a cruise I will have lots of time to work through in my head the metamorphosis of the old vice to something resembling the Rohm products- looks like a fun winters evenings project Thanks again Ian
13/07/2011 22:24:51
Dear All,
I have been lurking on the site for some time but have never posted before ,please excuse me if this question has been dealt with before. At the Midlands exhibition in 2010 I saw a sine vice which I believe had been made from a fairly cheap ubiquitous Tilting vice similar to the vice which formed the basis for an article on upgrading it in one of the very earliest Model Engineer's workshop issues. I have had one of these vices at the back of a workshop cupboard since I first started in the hobby , and have always meant to rectify its deficiencies.Having re read the MEW article I got it out finally at the weekend to start the job [ Oh Boy its no better than a set of castings!!], and remembered the sine vice at the exhibition. I had phoiographed it on my phone but the detail is not great . Does anyone know if it was a one off or made to a plan or published article. I really would like to have a go at the conversion as part of playing with the 'set of castings' Thanks for any info
Ian
Thread: lazer pointers for mill alignment
28/08/2009 08:04:38
Thanks for the information -this all came about when I was tidting the work shop and found a laser pointer I had started to modify and neverr finished -always the case- will now try and finish the job-ian
26/08/2009 09:00:09
dear All, I seem to remember reading an article on using Lazer pointers to align milling machine heads I have found the one in mew no79 but this is not the one I remember as it uses a lazer from maplin whilst I seem to remember one using a cheap hand held pointer and modifying the hole -is my memory playing tricks thanks Ian
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