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Member postings for Don Cox

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

Thread: Myford ML7 clutch
12/01/2020 08:54:23

My 1949 ML7 came without a clutch and was fitted with a 1/3 hp (I think) Hoover motor which I believe to be the original one fitted from new. The lathe was quite tatty when I collected it (cost was £450) but it had no insurmountable problems when I came to pull it apart. I rewired the motor switch set up, it now has an NVR wall mounted switch and a Dewhurst forward,/stop/ reverse switch mounted behind the front face of my home made copy of a Myford hexagonal stand.

I've had it for about 12 years now and have never noticed the motor to be over heated, I frequently use the belt tensioner as a clutch to limit the number of start ups and the Dewhurst switch stays permanently switched to forward.

I bought a Tri-Leva conversion to go on it a few years back, but I then chanced across an S7 (1963) on eBay, with a genuine hexagonal stand, a gearbox and close to home, for £950. So now the Tri-Leva bits remain unused in their box and the ML7 does a bit less than it used to. The S7 now has a VFD motor setup and, of course, it came with a clutch. I tend to use the lathes in turn to avoid having to change tool holders, chucks etc for different jobs, I don't find not having a clutch on the ML7 a major disadvantage.

Thread: Myford super 7 oiling
05/01/2020 09:06:16

We've walked this path before a few times. My solution has been to use "Valvespout" oilers, one for each type of oil (H32 and K68). They have a small nozzle fitted, similar in proportions to John Purdy's photos above, which will trip the balls in both the "grease nipple" type oil points and the flush to surface type ones on older Myford lathes, off of their seats to allow oil to enter with virtually no spillage. Have a look here:

Thread: ML7 Countershaft
25/11/2019 13:57:54

Mine's 0.75" measured on the open piece of shaft to the right of the pulley.


Thread: Just bought an ML7, what should i do first?
16/11/2019 08:59:11

If I remember correctly the handle acts as a locknut to the indicator dial, both of them being threaded. The best tactic might be to undo the two cap headed screws, grip the threaded section of the screw in the vice soft jaws and attack it that way.

You might be interested to know that ML8 wood lathes were often supplied with a metal lathe conversion, consisting of cross and topsides, which in my experience, have had very little use. I bought an ML8 and the seller gave me a brand new one, still coated in thick grease, as an after thought just as I was leaving. They occasionally appear on eBay from time to time.

Thread: Unusual GPO hammer?
30/09/2019 09:37:18


I think the point was that the units of issue were not always sensible and, if you were a rural linesman, out of reasonable reach of a store and at the end of a long day out in the rain, trying to guess what the unit of issue might be (bearing in mind the nearest rate book with its family bible proportions probably resided remotely in your bosses office) mistakes were likely. We were a comms company after all and I think a quick 'phone message from the store-man to check what was really wanted might have fixed it, I think most times they were just having a laugh.

By contrast a chair bound "engineer" with access to the book and a background of finding his way around it would seldom slip up I guess.

Worse, there was no apparent way back for over-ordered stores so I remember abundant amounts of wide insulation tape, washing up liquid, red coloured marker cards and many more items being offered around to all and sundry to try and lose them.

Don Cox

30/09/2019 08:41:28

My career progression with PO/BT reads exactly the same as Peter Shaw's, except my attendance span was 1963 to 96 when an indecently financial incentive tempted me to take the money and run at age 50. Indeed my level 2 manager during a significant part of my time there was a gentleman also named Peter Shaw.

I enjoyed repairing 'phones and call connect (switchboards etc) systems and also maintaining exchanges at various times. For ten years I looked after rural exchanges all on my own, the last selection included two TXE2s (processor controlled reed relay switched "electronic" exchanges) and a couple of UAX 13s (Unit automatic Strowger exchanges, I also had a UAX 14 at one time too), I look back on this period as the high point of my time there.

The rate book, or "Vocabulary of Engineering Stores" as it was also called, had one major failing in my experience. Items were listed with a "Unit of Issue" which did not always make sense. For instance, for wood screws it was 200, which resulted in one of my inexperienced colleagues receiving 30 boxes of 1" X 6 screws with an accompanying note from the store-man saying that this was all he had in his stock but that the remainder of the 200 boxes ordered would follow as soon as he got them, likewise jumper wire was "per metre" which resulted in a copy of the demand note arriving with a metre length of blue/yellow wire stapled to the top instead of the expected 200M drum. This situation was greatly exacerbated by the closure of local stores counters when the store-man could talk to you, and their replacement with centralised stores accessible only by Fax.

I enjoyed my time there (with the possible exception of my three years as a manager), the camaraderie was great, the training generally excellent, and it gave us, and still gives us, (my wife was also a GPO telephonist) a good living.

Don Cox

28/09/2019 21:12:45

God's Poor Orphans when i worked for them. I did pretty much all of the job types mentioned above, and quite a few more during the 33 years I was with them. Quite a few hammers were shortened to fit inside a tool wallet no. 3 which was the one carried by most linesmen (I was one of them too for a while).


Thread: Just bought an ML7, what should i do first?
14/09/2019 14:27:12


A couple of years back I was lucky enough to inherit a couple of Valvespout oilers. These have small, on/off controllable, nozzles which will fit into the original Myford "flush ball" type oilers ball apertures and those in he grease nipple types too. The balls are then pushed off of their seats to allow oil in, I have one with H32 and the other with k68 grade oil in, they both easily deliver controlled amounts into all of the oilers on my two Myford 7s and an ML8 . Have a look at one on:


08/09/2019 09:13:51

My 1949 ML7 came with a pair of Rotherams oilers, which are really just a pair of oil cups with rotating closable tops and which require topping up at each use. I later bought a pair of "cheap" oilers with sight glasses off of eBay, but could never seem to get them adjusted to deliver the right amount when in use and to stop oiling when they were off. Eventually I bit the bullet and bought a S/H pair of Adams oilers, as fitted by Myford on ML7s later than mine, and over a few days of occasional tweaking I can now say that oil is delivered when needed and stops completely in the off position. Adams are still out there, but at a price I guess: Good luck with your lathe, I still have mine, I couldn't let it go after the amount of TLC I lavished on it and it now resides in my workshop in a state of semi-retirement, alongside a 1963 S7 which now does most of the work.


Thread: strange power socket
15/08/2019 09:08:48

My father ran his own electrical contracting business following the second world war and was able to have the opportunity to buy a house on a small development, on the outskirts of Bath, where he was installing the electrics. As I understood it in later years (I was three when we moved in) ring mains were a new innovation then, everything previously had been spur wired and sockets were usually a maximum of 15A. As domestic electrical appliances became more common more sockets were needed (I have seen electric irons run off of lamp holders) which created cupboards full of switch fuses to control each socket, some of these were double pole fused which made for even more ironwork. He opted to use the Wylex plug and socket system and I remember our house being unusually well provide with socket outlets, all neatly terminated to a single consumer unit. Meanwhile the MK system was starting to appear and I think the British Standard was written around this. In the end he was forced to accept the change and MK pattern became the order of the day in his house. Some while back a 16A plug design was talked about but never adopted.

Thread: Meter Probe
13/08/2019 09:42:35

Over the 33 years I worked for PO/BT I had pretty much daily contact with their multi-meters, both as an exchange maintainer and as a linesman. Over that time the test gear was updated and the test leads too. One of the more annoying "improvements" was to the test leads which joined the probes, pictured above in the original posting, to the meter. Later ones of these had spring loaded insulating shrouds which covered the bare metal lead ends if they weren't plugged in. These had the very annoying effect of forcing the probes off of the end of the meter leads at the crucial moment. The need to get the probe onto a soldered tag deep inside a switch was difficult enough without the thing coming away in your hand just as you were going to look at the meter.

The latest standard test leads are next to useless in those type of circumstances, so the message must be look after any of this kit you still have, there ain't going to be anymore.


12/08/2019 19:21:14

I'm pretty sure those were the ones which came with most B.T. test gear when I last worked for them, now 23 years ago. In all that time I've never been able to track down a source of supply for replacements and I too have had to buy sub standard flimsy stuff. I'll be interested to see what else comes up.


Thread: Myford ML7 - Size of Mandrel Through Drilling?
12/08/2019 14:25:08

I have an ML 7 of (I think) 1949 vintage, no. K3475, it has a through bore of 0.58" although I reckon there may be some bits of swarf jammed in there which might have reduced it a bit.

I also have an S7 mk2 of (also, I think) 1963 vintage, no. SK62224 which has a through bore of 0.63"


Thread: "I'm calling about your accident" - how does this scam work?
30/07/2019 09:07:20

For quite a while now, BT has changed the policy on who controls the call. Originally it was always the incoming caller who could hold your line even after you, the called party, had "hung up" (it used to be for up to two metering periods when I worked for them). This was used to good effect by scammers who told you to call the security number on your bank card to verify what they had just told you about your account being raided was true.

Because of this, the system was changed to enable what is known in the trade as first party clearing, ie the called party can clear the call by hanging up and the line is freed. Since this facility has been available I have taken delight in explaining it to nuisance callers, with the parting shot of "I will now demonstrate this to you."

I don't know if other providers have this facility, it might be worth trying it out on the next incoming friendly call you have.

Thread: Pendulum enquiry
24/07/2019 08:01:47

I maintained a number of small/medium telephone exchanges until the digital revolution swept away all of the interesting stuff back in the '80s. Some had clocks 36, as mentioned in the link by Brian Oldford above, which provided timing to detect faults on the electro-mechanical equipment and a host of other functions. The stepper wheels at the top of the clock gave 1,6 and 30 second pulses (from memory) and the latter were used to drive slave clocks within the larger Post Office buildings and exchanges.

The basic principle used a Hipp contact to energise an electro magnet to restore the pendulum swing when it got below a pre-determined point, I seem to remember this happened every 6 swings. I inherited the task of changing the complete clock when I took over one of my rural exchanges, a bit like trying to nail a coffin to a wall, it took quite a while just to get the pendulum to hang directly over the pointer fitted at the bottom of the cabinet. After that I gave it a daily tweak to get the swing right, it took about 3 weeks to completely settle down. One of my ex colleagues has one working in his workshop.

Thread: Drip feed oiler plans
08/06/2019 19:36:47

This might be a good starting point:

Thread: Quicksilver
06/06/2019 09:31:46

My father used to tell the story that his father was given a mercury filled Fortin type barometer from a house he was working on. Having carried it, tucked horizontally under his arm, whilst walking from one side of Bath to the other, he was disappointed to find that the mercury had all run out! This was sometime pre second world war, imagine the hazard suited clean up campaign that would provoke today.

Dad ran his own electrical business and a couple of his customers were dentists, actually brothers, and he reckoned they were both mad as hatters (hatters, another part of the mercury story) The NHS still uses mercury amalgam for its bog standard fillings, my wife pays privately to have fillings in colour matched polymer which seems to have quite a long life. I did ask our dentist why they persisted in using what is generally regarded as a dangerous substance, his answer was that the biggest concern related to emissions from cremations, I told him that when it came to my turn I would try to keep my mouth shut.

Thread: Easy way of finding centre to drill a hole in round stock
09/05/2019 08:17:52

A statement of the obvious I suppose, but I use this method to set lathe tool height too.

Thread: Sump Plug
02/05/2019 09:41:12

I watched a salesman demonstrate a "sump sucker" whilst working in my retirement job as a workshop technician at a local FE college. He emptied the sump, via the dipstick hole, on one of our practice cars, a Maestro, the following day I removed the sump plug and drained a further half litre of very dirty oil. It all depends where the dipstick is in relation to the sump lowest point I suppose. Buy a recent Beemer and you won't even get a dipstick now.

Thread: Fillers & Paint ?
25/04/2019 23:19:35

Knifing Putty is not much more than thick paint suitable for filling stone chips and the like, its hardening time is dependant on the thickness applied and much more than a sixteenth of an inch can take days to go off. P38 Isopon hardens all through in about 20 minutes and sands well, if the imperfections are that small filler primer in multiple thin coats is probably the best option.

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