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Member postings for Douglas Johnston

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

Thread: Myford Gear Spacers
25/07/2021 15:59:10

I have experienced the same problem with my Myford Speed 10 and, like you, have just put up with it. I must get round to doing something similar for my peace of mind. I must say your handiwork looks very impressive, I am not sure mine will look quite so neat !

Doug

Thread: Adding thrust bearings to Myford Super 7 top and cross slides
10/07/2021 11:46:41
Posted by Martin Kyte on 05/07/2021 14:03:12:

I bet you don't Doug, they only sell the thrust kit for the ML7.

regards Martin

Ah, the one I got was for a Speed 10 which has the same fitting as the ML7, I did not realise the Super 7 was different.

Doug

05/07/2021 13:47:51

Arc Euro have a kit for this ( I bought mine ages ago so I hope they still have them ).

Doug

Thread: Bureaucracy with a tinge of Madness
25/06/2021 18:49:04

I tried to get my personal tax account access a year ago when I got the same letter about a refund. I also got blocked at the proof of identity stage and gave up in disgust, waited a number of weeks, then received a cheque in the post. A little later in the year I got another letter from them saying I had underpaid tax and they were going to reclaim it by adjusting the next tax code. I do wish they could do their sums properly and stop annoying us.

Doug

Thread: New here, just bought myself a Myford ML10 :)!
18/06/2021 18:08:53

Another very happy owner here (in my case a Speed 10 variant ). They are well made lathes and 20 odd years down the line my one is still as good as new. They are not perfect, but no lathe ever is, and this robust small machine will do a lot of things if one is realistic about size of work.

Doug

Thread: DC power supply question
15/06/2021 16:37:00

The transformer can be glued in place to avoid using the central hole but probably not a good idea to put the capacitor in there. I was forgetting that the outer case of the capacitor is aluminium and would probably get eddy currents in it. It was just a thought to save space but not one of my better thoughts.

Doug

Just noticed the above response about there being no magnetic field in the middle - you live and learn.

 

Edited By Douglas Johnston on 15/06/2021 16:40:14

15/06/2021 14:40:48

I am building a dc power supply for a project and am using a toroidal transformer along with an electrolytic smoothing capacitor and bridge rectifier. Now I want to make the whole thing as compact as possible and noticed that the capacitor fits very neatly inside the hole in the centre of the toroid but I worry that this might not be a good idea due to the magnetic field in that space. I know that there are people with electronic brains the size of planets on this forum so is this a good idea or a definite no-no ?

Doug

Thread: Radio controlled clocks
14/06/2021 11:45:58
Posted by John Haine on 13/06/2021 13:25:10:
Posted by Douglas Johnston on 13/06/2021 11:55:11:

I have one of those radio controlled clocks that refuses to lock on to the signal and slowly gains a few seconds a month. When the clocks change in October and April I have to take my clock to a high point in the back porch and leave it there for a day or two and it finally does the conversion. When it was new it worked fine for a number of years, then decided to annoy me for some reason.

Doug

If it's an MSF clock it may have stopped working when they moved the transmitter from Rugby (nearly in the centre of the UK) to Anthorn in Cumbria, so your signal level may have dropped.

That is interesting but since I live on the east coast of Scotland I am nearer the new transmitter, although there may be geographical considerations at work. I nearly threw the radio out when it first started to misbehave but tried placing it in a number of locations until I found one that worked.

Doug

13/06/2021 11:55:11

I have one of those radio controlled clocks that refuses to lock on to the signal and slowly gains a few seconds a month. When the clocks change in October and April I have to take my clock to a high point in the back porch and leave it there for a day or two and it finally does the conversion. When it was new it worked fine for a number of years, then decided to annoy me for some reason.

Doug

Thread: Mancave insulation
11/06/2021 13:18:56

I insulated a similar sized wooden shed about twenty years ago with the foil bubble wrap stuff and it does seem to work pretty well. One of the biggest benefits is keeping the inside temperature down in the summer. Before fitting the insulation the shed was unbearably hot in the summer but became much more pleasant after the insulation was fitted.

Doug

Thread: Lathe bed way cover
06/06/2021 20:45:48

I have used oven liner material to provide a swarf guard, it seems to stand up to hot chips very well and is very flexible.

Doug

Thread: R8 Help me please!
26/05/2021 18:57:26

Also check the diameter of the plain section at the top of the R8 (0.9495" in drawing above ) . I have bought a few R8 collets that would not go in my mill because that part was just a tad oversize for my machine (although still within the R8 spec ). Removing about 0.0005" from the diameter cured the problem.

Doug

Thread: New use for a slide rule
23/05/2021 11:00:48

When I did my engineering degree in the sixties a slide rule was one of the first things I had to buy. I too still have it although it has not been out of the box for a very long time. It was amazing what one could do with it but I would hate to go back to using it.

Doug

Thread: What is the weight of a Myford ML10?
23/05/2021 10:54:31

I have a Speed 10 with the long bed and if you are worried about lifting the lathe that should not be a problem. I easily lifted my one with the motor and tailstock removed (mind you that was rather a long time ago ! )

Doug

Thread: MIlling cutter pulling out of collet
04/05/2021 11:12:08
Posted by Bill Phinn on 04/05/2021 11:00:06:

Another thing to look at if other suggestions haven't identified the source of your problem: my first ever R8 collet, bought from a reputable supplier, was fine out of the box on its first use. On its second use I couldn't get it to close quite firmly enough onto the cutter.

A careful look along the full length of the collet's slots revealed an inch-long curly strand of metal hiding away in one of the slots that was still attached to the collet at its upper end. It had clearly not been machined away as it should have been by the manufacturer during the cutting of the slots. On its second use it must have moved position to interfere with the proper closing of the collet. Once removed, everything worked as it should have done.

Edited By Bill Phinn on 04/05/2021 11:03:41

I bought a set of dirt cheap er collets on ebay a while ago and almost every one had a load of these slithers of metal still in the slots. As they say, buy cheap, buy twice !

Doug

03/05/2021 22:46:37

I have a 12mm carbide cutter that tends to do the same thing when held in an R8 collet. The shank is very smooth and as mentioned above this may be the problem. I must try slightly roughing the surface and see if that helps. It is downright annoying when it happens and I now use one of Arc's indexable carbide shell mills on an R8 arbor when there is any danger of creep from an endmill. As an aside these shell mills are superb and give a very good surface finish.

Doug

Thread: Issues 303 stepper driven rotary table with hobbing capability
30/04/2021 18:24:05

This is often the problem with articles which only demonstrate a device. Such articles are not meant to be used to make the device but merely show what is possible. They can be very interesting and inspiring but can also be frustrating if you want to build the item in question. I too read the hobbing article and would love to build something similar but would need a lot more information to make that feasible.

Doug

Thread: oil blackening
30/04/2021 11:31:31

I think it is unwise to use engine oil that has been in an engine. I'm sure I read somewhere that there is a cancer risk with that approach. I use cheap supermarket rape seed oil and that works well for me.

Doug

Thread: Four facet drill grinding.
27/04/2021 22:46:29
Posted by Journeyman on 27/04/2021 16:38:08:
Posted by Douglas Johnston on 27/04/2021 16:06:24:

That is an interesting 4 facet grinder. Does anybody happen to have a copy of the article from HSM as I would love to have a look at it.

Doug

I got a copy from John Moran (AKA Gadget Builder) try his Email: John at GadgetBuilder.com if you get no joy PM me and I will rummage in the archive and see if I can find it. He sent it to me as a web page.

John

P.S. Don't forget to change the ' at ' for a @

Edited By Journeyman on 27/04/2021 16:39:10

Thanks for providing that email address John. I contacted John Moran and he has sent me the relevant files. This will keep me in reading matter for a while, then I will decide whether to make one.

Doug

27/04/2021 16:06:24
Posted by Journeyman on 26/04/2021 17:18:45:

There is an article by Gadget Builder in HSM (Home Shop Machinist) try this link to his pages there is a whole load of info on drill grinding , jigs and some of the theory. Also a powered 4-facet grinder/jig ** Drill Sharpening **

John

That is an interesting 4 facet grinder. Does anybody happen to have a copy of the article from HSM as I would love to have a look at it.

Doug

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