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Member postings for Frances IoM

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

Thread: Ebay site changes for the worst
17/09/2019 19:27:15
setting up a clique to obtain items cheaper is actually illegal - no different than several other forms of white collar crime eg insider trading, currency manipulation.
Thread: ME 4621 availability
17/09/2019 18:19:01
it had managed to get across the Irish sea for sale by Friday lunch time at W H Smith in Douglas.
Thread: Chester Micro-Mill motor
16/09/2019 19:14:26
are you sure it is the motor - usual failures are the controller boards especially if it is a somewhat older model as those electronics were more prone to fail than more recent models - replace the motor with an old 100W lamp and see if the controller will alter the brilliance.
Thread: Need help with meddling pillar drill.
15/09/2019 18:32:46
assuming that one side of the charger output was already connected to ground and the other side made contact with the usually grounded metal work of the the drill then the damage assuming a high current charger is likely to be a damaged earth lead that found itself completing a low voltage high current loop and any connectors it goes thru (there was a case some time ago when someone welding on a lathe burnt out the earth wire which burning damaged nearby wires - it is possible this has happened in your case.

Edited By Frances IoM on 15/09/2019 18:33:05

Edited By Frances IoM on 15/09/2019 18:33:50

Thread: Motor wiring
14/09/2019 17:47:50
it may be useful to look at the wiring to/from the capacitor as both ends of the start winding might be brought out there tho with a motor designed for a saw there is no need to allow choice in motor direction

Edited By Frances IoM on 14/09/2019 17:49:27

Thread: Are there any left?
13/09/2019 19:07:28
Richard - look back in thread to 5th + subsequent posts
Thread: Anyone know where I can get hold of 'Gauge Rods'
07/09/2019 19:07:14
He doesn't have to earn that much making the thing - more money from the video, placement fees + tutoring aspects
05/09/2019 15:49:05

I have a specialised set of gauge blocks - the thickness run from 0.5 to 0.9mm in 0.05 steps the 0.91 to 1.0 mm in 0.01mm steps Not sure for what purpose they were acquired by a now defunct microelectronics company - dated 1971 made by Cary Le Locle Switzerland but marked on box "Calibration uncertified"

mmgblks.jpg

(difficult to photo as very reflective)

They are really clean room only use - they need cleaning (iso-propyl)  but my own usage is more admiration than use as I have a more useful standard imperial set which allows checking of mics etc

Edited By Frances IoM on 05/09/2019 16:00:27

Thread: Fitzroy storm glass
04/09/2019 18:23:22
the Norwegians used to sell 'water distillation' kits that just happened to allow fermented plum juice (+ possibly other juices) to produce a potable drink (remarkable what one can drink when legit alcohol is extremely expensive) - I bought at auction 5 litre of surgical spirit as used in beauty salons - I use it as a cheap way of cleaning certain oily residues but it contains some oil of its own + a perfume.
Thread: Mains power supply for 12v dc motor
31/08/2019 18:35:10
SOD - yes the cost of a 120+VA transformer is way more than the cost of a single IC and a few components using a switched mode technique - these usually auto sense a 6V or 12V battery + depth of discharge - I suspect the 24V are similar. Gone are the days of a heavy transformer and the selenium rectifiers that indicated failure by odour.


Re ATX PSU's most do have a 5v minimum load requirement - the 80A server type are adjustable between 12.1 and typ 12.5V to allow for cable loss enroute to the compter board - on which is generally a smaller switch mode supply for the 3.3V - tho the one I illustrated will supply an 8A 3.3V standby supply for keeping some circuitry alive - it would be useful if two could be placed in serial to provide 24V but on all I've seen the bonding back to the case + earth makes this tricky (doable but needs a very awkward chassis isolation of one PSU)
31/08/2019 13:54:06
a charger for a 12V lead acid battery will deliver near 14V if old fashioned type - modern chargers will sense output + current and may not like a motor connected as no voltage on initial startup looks like a shorted battery
30/08/2019 23:44:24

psu1.jpgmy own supply was the local auction house - I paid ?50 for 10 HP new 85A server PSus still in packaging - last week I bought another hp type DPS 800GB A for about ?4 - all in a box 250mm x 85 x 50mm - the two small fans are noisy (but you can slow them if you only want a miserable 10-20A - the other slight problem is buying the edge connector - but you can solder directly to the edge connector - you may need to search for the connections however as these don't come with instructions.

But just search for hp switching power supply for servers

Edited By Frances IoM on 31/08/2019 00:03:23

30/08/2019 22:34:01
duplicate - BT keeps dropping my connection

Edited By Frances IoM on 30/08/2019 22:35:06

30/08/2019 22:33:26
server computer power supplies costing ?10 or so from usual sources can supply 80A at 12.2V - I have a couple that will supply 150A at 12.5V
Thread: Machine alignment using low cost electronics
24/08/2019 16:36:03
if the light source is a monochromatic laser isn't he effectively using a monochrome system - admittedly non-laser light = noise and no doubt he would get better sensitivity and resolution as well as avoiding problems with the colour separation mechanism of the camera sensor
Thread: M4 x 0.75mm pitch CSk machine screws
22/08/2019 20:45:56
It was used - I have a tap (French made or labelled I think) + possibly a die among the pile of 'it may be needed sometime' items.
3 BA is fairly unusual - the odd BA sizes tended to be used by electrical industries that did not want consumers to fix or access the innards or organisations that wanted to discourage employees 'borrowing' a few fixtures for home use.
Thread: Thread sizes on flexispeed meteor lathe
22/08/2019 16:09:03
I suspect you will find these to be BA as in this period use of such threads was common in UK - they are still available tho in a restricted set of sizes - it might will be useful to find your local ME club and beg a few examples of 0, 2, 4 and 6 BA machine screws + nuts as these are the most likely to be found and use these as test pieces - if you are going to 'do up' old British equipment then any metric purity needs to be lost and some relevant taps,dies etc obtained (ME societies again are a good source from their rummage/jumble sales) Quick guide is that 0BA had a 1mm thread and each BA step size reduced this to 90% of the previous size thus 2BA would be 0.9 x 0.9 mm or .81mm 4B = 0.81 x 0.81 or abt .65mm thread

Edited By Frances IoM on 22/08/2019 16:16:33

Thread: Are there any left?
21/08/2019 11:33:32
2 years ago walking up the hill to Lincoln Cathedral came across such a shop that took me back to the late 50s and early 60s with its collection of radio 'surplus' inc some that dated back then! I subsequently noted their adverts in one of the electronics mags but can't recall seeing them recently so maybe it has ceased
Thread: LED Dimming
20/08/2019 16:27:40
rather than ordering from epay where there is little control over quality I'd suggest find your nearest trade dealer eg City Electrical, TLC (they have a useful paper catalogue), Rexel etc and buy matching lamps + dimmers - they will usually give trade discount if asked + have advantage stuff can be returned if faulty To back up John's point - most dimmers intended for heavy loads have a minimum load that far exceeds a puny LED lamp.

Edited By Frances IoM on 20/08/2019 16:29:31

Edited By Frances IoM on 20/08/2019 16:30:04

Thread: Need a lot of help from you good people
19/08/2019 23:52:18
I suspect the control system is well pre-electronic and worked in the same way as the old SR electric stock using control of the field current possibly by switching voltage or by resistors hence the two controls using a multiway rotary switch (rather like those I built as a workshop exercise 50+ years ago!
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