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Member postings for DMR

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

Thread: Dorris article
26/12/2019 12:36:20

Jon,

Not familiar with Doris but the article is in the Q&A section and covers the apparent lack of lagging/cleading for the boiler. There is apparently limited space and the question covers the use of a Martin Evans "Euston" boiler design instead with some associated redesign work. Martin Evans answers with various boiler possibilities.

I have PM'd you if you still want a copy of the page.

Dennis

Thread: Faulty LED
17/07/2019 22:22:53

More info would help and I fail to see why a circuit board is involved unless you just mean the tracks in the light cluster. You appear to have purchased replacement LED lights for a car, or at least a vehicle that is not a motorbike as you seem to need more than one of each. A tail light is no different to a brake light so far as putting 12V across it. The brake light takes more amps/power and is brighter.

Does the suspect LED work in the other tail light socket? Is the other tail light illuminating in both sockets. With limited info it is only possible to say the following. A conventional filament bulb takes a lot more power than your LED. If the other LED works in both tail lights and the suspect LED works in neither then you have some form of duff LED. If the one socket refuses to light the LED then that socket has a fault in the form of a bad wiring connection.

A bad wiring connection may well be overcome by the demand from a filament bulb. It may well arc across the connection and seem OK for some time, even if it gets hot/warm locally.

Do some swapping about of bulbs in sockets where possible and you should solve it.

Dennis

Thread: Help making Radius Turner
27/06/2019 02:09:27

Yes, it's Cycle Thread. The reason for using the finer thread is that it is less likely to come undone/work loose. Therefor a 1/2" x 20 UNF would be better than 1/2" x 16 BSF and should be fine for personal use. You still need an 11.5mm or a bit bigger drill for the UNF tapping size. Better still would be 1/2" x 32.

At a real push and with good confidence, you could machine to a fit (no thread at all) and superglue at least the lower parts together.

Just go for it but make your parts concentric. No hand threadcutting in space.

Dennis

Thread: Belt cover construction
01/04/2019 14:33:30

Hi Plasma,

I have serial number 66152 which looks identical. You are in fact two pieces short as the cover needs a back support as well on that model. It is sheet steel but I wouldn't have to try and bend it up at the original thickness! It even has turned in edges! Sent you a PM.

Dennis

Thread: Micrometer woes
30/01/2019 23:59:52
Posted by Michael Gilligan on 30/01/2019 23:38:51

Sorry Dennis, but I must beg to differ

Philip's question was:

Need to source some hard foam to make some new nesting packs, suggestions anyone?

and .. my two consecutive posts on page_1 were quite explicit.

MichaelG.

The very reason I don't respond to much on this site. You gave him a possible suppliers name, about which he may have to buy a lorry load to obtain what he needs. I don't know, but my solution may get him an offcut for nothing which is all he needs. I am gone.

Dennis

30/01/2019 23:27:00

All fine commiserating responses but not really answering Phil's question. I too have suffered the powdered foam and replaced it with some women's materials. My wife tells me it is called Synthetic Wadding available in sheets of different thicknesses and mine is white. I just layered up what was donated to me. It cuts well enough, but would not replace felt lining as it is very open in texture and quite hardish.

Just done an Amazon for that name and it brings up some that may be far too soft. Suggest going into furniture restorers or women's materials shops. I cannot be more specific.

I have the stuff in a few places with some oil applied for good measure and it shows no signs of breaking down so far. About 5 years for some of it I would say. I also have applied some felt in places but also oiled that as well.

Dennis

Thread: Myford Super 7 Backgear eccentric screw
31/12/2018 22:48:37

Well now, what size drill did you use? BSF tapping is 5.3mm for a good fit. If you have drilled out much bigger than that you are going to have to form a new thread area at some bigger size and make a special screw to fit or do as you suggest yourself with a plug. If you have gone off-centre with your drilling (which is likely) then a plug would be better with a pre-drilled and tapped central hole. Since your new screw is tight there is a chance you can form a fresh 1/4" BSF thread in what is left, but it sounds as if you have drilled out too big to do that. Note that the hole/thread must be fairly square to the original hole for the eccentric shaft to lie in the right place. Whatever you do, you need a right size set of second and plug tap.

As a second thought your new screw from new Myford may have a 6mm metric thread.

 

 

Edited By DMR on 31/12/2018 22:51:47

31/12/2018 21:33:34

1/4" BSF. Only the outer 0.350" or so is threaded. The rest measures 0.193" dia or 4.9mm (just a BSF clearance) and is about 0.750" long with a bit of a lead-in taper at the inner end. Overall length is about 1.080". I have a used spare in my hand but new Myford will sell you one. Part A1987 Backgear eccentric screw. Same on Mk1 as the later ones up to metrication.

Good luck, Dennis

Thread: Mk1 Super 7 - What colours ?
05/12/2018 21:52:40

Dave,

I am entering this conversation without reading it all so just three points:-

1) The yellow down the middle of the bed depicted an unhardened bed. A hardened bed was painted red.

2) A wide gauge saddle will not work on your early bed. The leadscrew claspnut will not line-up.

3) The Brass tube on the drip-feed is a push fit, straight sided arrangement. You need a good BSF bolt (1/4 BSF I think) that will screw in the length of the thread so as to have a fair chance of not stripping it. Set up a lever arrangement to the back side of the oil well and pull straight up; it gives way very suddenly - frightening!

As to your cracked white back piece. Once you have it out, assuming it has not been bodge-glued in before, apply some Araldite or similar to the cleaned-up outside of the crack and that will do the job. I just run a bit of oil via the tap at start of session and that works fine. The sightglass was never meant to be filled, so no need for an oil-tight fit.

Dennis

Thread: Myford Super 7 Help please
20/05/2018 14:35:19

Paul, The machine number starts SK?????. I can just make it out on the front of the bed in your pictures and it helps to quote it. The gearbox has a number too QC?????, stamped on the r/h end. You don't show any other chucks, particularly a 4 jaw (not drill chucks) Various aspects put it at early 60s and it has raising blocks, Myford stand, drip tray and of course gearbox. The motor on the floor seems extra - a spare in addition. There are no other extras like vertical slides, steadies, etc which would increase the value. Don't run it without checking oil levels and do you have the service manual? A buyer should want to see it run.

I don't think its been repainted: the finish is too good. Just never been used as in no paint chips and only basic additional equipment. Hence the superficial rust on unpainted surfaces. The state of the bed matters a lot and whether the carriage will slide all along it without any looseness. Include a picture of the l/h end of the bed for any damage as that means a lot too.

It would help you to say where your are in your profile, if only approximately, and a buyer may emerge locally. The world is as Tony and Dave say. If it is the unused/unworn machine it appears to me to be then 2K is not impossible.

Dennis

Thread: Myford super 7
19/05/2018 14:44:44

Michael, I have sent you a PM with my e-mail address.

Dennis

19/05/2018 00:54:06

Michael,

The last S7 to have the "early" expanding clutch was SK 8127 made in June 1958 so your 1964 (It is) bed has been married to an early clutch at some time in the past.

I no longer have an early clutch but the shaft end float you describe should not exist. Do you have the red fibre thrust washers (2 off towards each shaft end) shown as item 4 in Robbo's part diagram? They were about 1mm thick each and would account for the float. As to the drag, the clutch ring should be free inside the pulley in its relaxed state while you have it apart, and it sounds like you were trying to remove the adjusting screw with the clutch engaged which is wrong. The adjusting screw should be domed where it meets the taper slot in the Actuating Bar. I have the early manual pages for setting the clutch which I can e-mail if you want them.

Dennis

Robbo beat me with some of this

Edited By DMR on 19/05/2018 01:20:13

Edited By DMR on 19/05/2018 01:22:31

Thread: Repairing a Verdict Dial Test Indicator
02/05/2018 22:50:47

So it is a Verdict.

Your "hair spring' in your top picture is bent such that it appears to be trying to move the main lever upwards but the lever has not moved upwards. Couple that with the external ball-end knob in your bottom picture being apparently centre biased then the spring should be quite straight and unseen under the main lever, unless things have changed between pictures.

Edited By DMR on 02/05/2018 22:52:48

02/05/2018 22:07:43

Martin,

To me, your verdict is not just elderly, it's very elderly/old and nothing like the pictures posted. Does it say Verdict on the dial or are you just referring to it as a Verdict type? Go back to my first post and consider that the dial pointer only travels just over one full turn. Move the lever under the dial to each extreme and you should find that the dial pointer reverses its action by one turn. The probe then works the dial in the other direction. It is not a centre-zero device. Rotate the dial's bezel to reset to read zero if required. If you do have a fault the spring wire (your "hair spring" description I think) on the inside end of the external lever looks bent in your top picture.

Mick,

I have no idea how old my Verdicts are; they came to me with a Myford years ago. I would assume that a plastic lever would represent a more recent 'improvement' as they say. I have three of them, all in their blue boxes with fittings but I only ever use one of them and there are multiple variations of the included fittings The two unused ones have one inch diam dials and 0.01mm and 0.001" ranges. The inches one sports an extended probe (by me) to the original, 20mm long instead of the original 10mm that I made when I needed longer reach, not considering the loss of sensitivity as a result. Just a means to a tricky end. Incidentally I have two spanners to fit the flats on the probes included in the boxes so some gauges probably came with multiple probes with different lengths and/or tips.

The DTI I do use has a 1.5" dial and 0.0005" scale which totally beats the other two, I normally use a dial gauge through choice and never measure with any of them.

Dennis

01/05/2018 14:01:53

Just for Martin's sake (and if we have diagnosed his problem correctly) I have put some pictures in an album of what the lever under the dial should look like. The washer is chamfered on the outside and creates friction with the lever to hold the lever in place. Have a go Martin. Don't sling it.

Dennis

01/05/2018 00:45:01

You seem to be misunderstanding the action that is supposed to happen. Non Verdict DTI's sit (sort of) in mid range and will work either way, not necessarily returning to a zero on the dial unless you rotate the bezel to read zero. Some of mine go a bit over a full turn each way but one does one and a half turns each way.


Your Verdict should have a little external knob under the dial which biases the action one way or the other. It is not meant to go plus-minus of some reading and the full needle rotation is only just over one turn. That is to say that the needle is biased to one end, or the other, of its one turn by the external lever under the dial. On some the little lever was plastic and broke off but you can replace it with a bit of sheet springy steel correctly bent. I seem to recall I repaired one once. If you have a missing lever and nothing to go on to make a suitable replacement (another Verdict) then you will struggle. It has a washer and a pin externally too. The shaft for the lever should exist with its cross hole for the pin.
Hope that makes sense. Could try and take some pictures for you, but it's all tiny. PM me if you wish.


Dennis

Thread: Early myford super Seven parts identify plz
03/12/2017 22:46:16

Hi Piero,

Well you have a later Myford Metric Conversion Set there. The label clearly states part number 1481/1 but also mysteriously states "For QC2495 and onwards". "QC" stands for Quick Change. I have always understood that gearboxes from QC2501 were the later pattern.

Anyway, you have the later gears set which is not ideal for your gearbox. I think you may have counted teeth wrongly, for instance the one cog in the layer with the change gear quadrant (or banjo) I believe is 30t. and you list 2x28t and no 30t at all. There is only one 28t in the set and unlikely to be use for 2. However, my set only consists of 12 gears and your set has 14 but, as I said before, some gears may have been added and there is evidence of different paint colours!

To cut metric threads with some accuracy you replace the fixed gear set inside the changewheel cover with the quadrant in the box. The circular hole in the quadrant fits over the gearbox input shaft. The two shafts in the layer with the quadrant need fitting first (remove the nut, sleeve and washer first) as they go into the back of it. All is clear if you have the pictorial of the quadrant that I stated in my previous post of 28 Nov.

Do you actually have the 12 gears that I listed in that post? If so, how many teeth do the other two gears have? Another complication to answering your problems is that my Metric Set is on three layers in its (original) box, but the layer with the quadrant is the same as yours. Do all 4 layers fit inside the original Myford box or do only 3 layers fit? We could talk about this better if you PM me your e-mail and I can supply tables of cog set-ups which will work for your gearbox. But you do need a few extra gears to be able to cut all threads.

Lastly, your opening question and pictures included a washer with a keyway cutout. There should be two of those included in the set, 50thou thick. The shaft in those pictures may be the same as the 2 shafts in the layer with the quadrant piece, and if so is a spare. The 30t in the pictures is not Myford if it is, as you stated 1/2" thick. Do not be tempted to try and use it with the metric set.

Dennis

02/12/2017 16:49:11

Hi Piero,

1) No new photo's on this site. Have you put them in Photobucket or something else?

2) Your stated list of gears is not a Myford one I recognise. You have listed 45t twice separately, is that an error? Your list does not fit the non-gearbox selection either.

3) A picture of the banjo may reveal what the set belongs to. Is there a label one the box? Is there a number on the box?

4) You stated at the start that the 30t was 1/2" wide. Are they all 1/2" wide? Myfords are 3/8" wide.. Do they have a keyway cut? Are there any holes in the gears near the middle besides the centre hole?

5) Have you obtained a replacement leadscrew and fitted it?

6) Have you rebuilt the gearbox and had it working?

Is there anyone near this chap in St Albans willing to help him out?

Regards

Dennis

28/11/2017 23:55:23

Hi Piero,

The early "Metric Conversion Set" for the gearbox you have consisted of 10 gears as follows: 20T, 30T, 35T, 40T, 44T, 45T, 52T, 55T & 2x60T. If you have these in your box then you have the early set. The pictorial supplied by Simon and which you have on your changewheel door is the correct one for your lathe, but the conversion set that you have may be a later set for the newer gearbox. As further clarification the only difference between the two sets is in the gear selections, all the other parts stayed the same.

The later set consists of 12 gears: 28T, 30T, 35T, 40T, 2x45T, 2x50T, 55T, 2x60T, 63T. With my set of later gears in its box, I have supplemented the set with additional cogs and any previous owner may have done the same or similar with the set you now have. My choice of my extra 6 cogs gives me all the options for any thread using the early gearbox.

The use of the metric quadrant is fully explained in the gearbox manual, most likely page 6, along with a pictorial of all the parts you should have in the box. The parts list also shows the Conversion set pictorial and if that fails the Myford site has it for free under gearbox. The washer and shaft in your pictures should be in the box and probably the two cogs as well if there are spaces in the cardboard cutouts for them to fit. There is nowhere in the box for the tumbler sleeve gear. Note that as already explained, the ratios in the later gearbox manual do not work on your gearbox.

As an additional note, The early "Metric Set" on the early gearbox did not give as accurate threads as the later combinations.

Hope that helps

Dennis

27/11/2017 21:26:00

Oops,

Quite right Simon, Old age strikes again. I only formulated my own "metric roughs' tables for my newer machine. I must get round to doing the same table for my older one. Divide by 2 with quirks. I prefer my threads to be right, so I've never actually used the option.

Dennis

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