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Member postings for Phil Whitley

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

Thread: Oh bugger, I told you I was ill
05/06/2019 19:24:39

What an Ebay hero!, I have met the surgeons knife many times, but it gets no less nerve wracking1 It is done now, take it easy and allow yourself time to recover. Good luck young man!

Thread: Rage Evolution sliding saws
01/06/2019 16:16:14

For the price of these saws of dubious Quality you could pobably get a single phase Manchester Rapidor, which is vastly superior, provided you have the floor space, and will cut anything you can put in its vice, and the blades last for ever!

Thread: Should I have 3 phase supplied to my house?
30/05/2019 20:52:00
Posted by Andrew Johnston on 30/05/2019 11:59:00:

I stand by what I wrote in the thread quoted above. The installation was expensive, but partly justified by updating an inadequate single phase supply.

I have recently had to change the single phase consumer unit that was installed as part of the 3-phase installation. The old one was plastic (as recommended by the regulations of the time) and replaced a metal one. The new one is metal again (as now recommended), as the plastic ones were found to have a tendency to catch fire in the event of a fault. So much for the ex-spurts.

Andrew

The reason we have gone back to all metal clad CU's is that the ex-spurts did not realise that when an rcd or mcb fails, as all mechanical devices eventually do, they do not fail safe, and catch fire! A fuse always fails safe, but they are the EX-spurts, so they must know best. Pity the poor people who have just paid out a fortune to have their old wylex removed, and replaced by a brand new plastic CU. Good business for the fire brigades I suppose. Never known in 50 odd years experience for a consumer unit to catch fire with fuses in it, even when some idiot connects a 10kW shower to an old wylex, all they do is smoulder and give off a really offensive odout which leaves one in no doubt that something is wrong!

Thread: Getting rid of the garage door...........
25/05/2019 18:46:36

one of my doors was an up and over, swapped it for a s/h roller shutter, cheap, and more secure, and plenty for sale!

Thread: Oh Dear, I've blown the chop saw...
25/05/2019 18:42:45

Check between the comm bars and the armature spindle for leakage, preferably with a megger, armatures usually fail to earth when they overheat and the varnish melts. also check continuity through the field coils, and to the metal laminations of the field coils.

Thread: Interesting??
24/05/2019 18:16:34

I would recomend everybody to do some research, especially on Edison, a brilliant self publicist with a very active worldwide network of offices that fed information back to him and his team about what was in development throughout the world, so he could get first US patent. A very smooth operator with a very musky odour!

23/05/2019 21:29:21

BTW, not intended as a "Tirade" just observations really. I don't get what quantum physics has to do with GPS, we were positioning accurately to a matter of a few feet shortly after ww2 using ground stations, in 2 dimensions, the ability to launch sattelites increased this to three dimensions, and meant that terrain did not get in the way. Turing was a genius mathmatician, but could not have built the computers he needed, but he was able to get his ideas over to a clever GPO telephone engineer, who built the first computer since Babbages attempt at the mechanical one.

23/05/2019 21:06:20

Basically, Wot Neil said!! But some observations. Edison invented nothing apart from his telegraph device, that was not already working somewhere in the world, he merely obtained the first American patent on that thing by getting his team to come up with a quick working prototype and rushing to the patent office! Maxwell was a mathmatician, Steinmetz was a mathmatician and experimental engineer. The lone inventor is all but extinct because of the patent system. It has become possible to patent ideas without any proof of concept, and so teams of company scientists are involved in this process daily, (IBM are one of the biggest) with the result that no company will fund research into any area that already has patents owned by another, and if anyone does come up with something that works, they can use their legal and financial clout to make your invention come under their patent. I have a friend deeply involved in traffic management systems, and he and collegues worked on an idea for several years, which they patented, for a bus navigation system, which they showed to a major european bus manufacturer. They changed a chip in it, stole the device, and said, ok so sue us! The possesion of a patent means nothing unless you can afford to defend it succesfully in two or three cases, and as Mr Dyson has found out, that costs millions. There is no such thing as Artifical intelligence, that is the hype that makes people believe it is clever. It is merely a machine functioning as it has been programmed, and you can program a machine to write its own program, but it is not capable of thought, it is just crunching zeros and ones very fast. The self driving car, like nuclear fusion, is only twenty years away, and always will be! It requires consciousness to drive a car, not just inttelligence. I have been looking for some proof of this for some time, and found it in some recent discoveries in Neuroscience. If you take a subject with a damaged visual cortex, who has no vision whatever, but has perfectly working eyes, and sit them in front of a screen, you would imagine that you could play anything on the screen and it would have no effect on them, and you can, except that if you show them an attacking predator, they immediately recoil from it, but when asked, say they saw nothing, and do not know why they recoiled. You need this sense to drive a car, how are they going to build that into a computer? By the way, whilst there are theories about magnetism and electricity (and gravity) no one has come up with an explanation of what they are and why they occur, they have merely been quantified Tesla, Heavyside, Steinmetz and Maxwell all denied the existence of the electron, and their calculations are no less correct for it.

Thread: Oh Dear, I've blown the chop saw...
23/05/2019 20:24:56

actually looking at the pics again, is that a bit of blackened field coil I can see through the lower gap? Field could have failed and caused the arcing at the armature. Armature failure is more common though.

23/05/2019 20:21:20

I see that the gaps between the commutator bars are wider in the middle, looks like the insulation has failed in the armature windings, test between the comm bars and the shaft of the armature, with an AVO, or a megger if you have one, any continuity, or a resistance of less than 1 Mohm and the armature is toast. Check the manual and get in touch with the spares supplier, then at least you can weigh the cost of a new armature against the cost of a new chopsaw.

Thread: Interesting??
23/05/2019 09:13:00
Posted by SillyOldDuffer on 20/05/2019 21:07:05:
Posted by Phil Whitley on 20/05/2019 20:07:54:

The steam engine was invented , built and used in many forms without any knowledge of thermodynamics, in fact the science of thermodynamics was based on the study of working steam engines. The electric motor was invented by Michael Faraday, who was a well trained book binder who was employed by Sir Humphry Davy to write up and bind his notes. Science and scientists have a very poor record of invention of anything in common use today. It is the people who constantly test the laws of physics and experiment that make the breakthroughs, those who stick within the orthodxy of science discover nothing.

A very unfair criticism of science because the goal of science is understanding, not inventing! It's other people, like engineers, who exploit scientific understanding by inventing new things or improving old ones.

Dave

I don't see it as unfair, pointedly accurate perhaps, science is often understanding for the personal satisfaction of the curiosity of an elite, who never put that understanding into practical use. It can also be the development of very efficient new poisons to kill pests and weeds without any consideration of the future effects. Our entire electrical system was brought to the point it is in today by a small group of brilliant engineers, Tesla, Heavyside, Maxwell and Steinmetz are the main ones, and their work has been advanced very little in the years since their passing, and also no one ever heard of them, except perhaps Tesla. Einstien on the other hand is universally known, and much of his work is theoretical and obscure (and possibly wrong, they are only theories!), he got his Nobel prize for a paper on the Photoelectric effect, which he neither discovered or put to use, he merely "quantified" it. Tesla called Einstein a "Fuzzy haired crackpot" Science, as in the "understanding of the universe" is important, but going to the moon "because we can" turned out to be a pointless waste of resources.

Thread: What do YOU call it?
23/05/2019 08:48:38

I call it work!

Thread: Oh Dear, I've blown the chop saw...
23/05/2019 08:46:14

When I buy any tools from Aldi/Lidl, first thing I do is staple the reciept inside the instruction manual that comes with the tool. You do after all get a 3 year warranty!. first off, is it a soft start motor, ie does it ramp up the speed after you have pulled the trigger? if it is, suspect the thyristor control failure, which is quite common. second, check the interference suppression capacitor bridge, they blow up very loudly and frequently, and the tool will work without it anyway. Parts are usually available from Kompernass, which is the german company that imports these tools, check in the manual. Strip it down, and find where the smoke came from, it will be fairly obvious. If the commutator slots are not parralell, and burnt, armature failure may make the repair not worthwhile, but check on the price anyway, I have many Aldi/Lidl tools, and have abused some of them to the point where I was not really suprised they broke, but by and large, they do the job, and if they quit within three years, you get a new one or a free repair provided you have the reciept!

Thread: Interesting??
20/05/2019 20:07:54

The steam engine was invented , built and used in many forms without any knowledge of thermodynamics, in fact the science of thermodynamics was based on the study of working steam engines. The electric motor was invented by Michael Faraday, who was a well trained book binder who was employed by Sir Humphry Davy to write up and bind his notes. Science and scientists have a very poor record of invention of anything in common use today. It is the people who constantly test the laws of physics and experiment that make the breakthroughs, those who stick within the orthodxy of science discover nothing.

Thread: A dynamo question: rotation direction?
11/05/2019 18:48:52

Tim, long time since I did a dynamo, so don't have the circuit in my head, but to reverse a universal or DC brush motor, you swap the wires connected to the brushes over. You have proved it as a motor, if you polarise it by sparking a battery lead onto the field terminal, then spin it in the right direction and see if it charges, or you get some output. I assume the car is positive earth, so flash the battery negative to the field to polarise it in the right direction and it should be fine. We used to swap over from + eart to - earth to install a stereo, which were mainly -earth, just swap the battery and coil terminals, repolarise the dynamo, and off we go! can you post up a circuit for the dynamo internal connections?

hope this helps

Phil

Thread: Bandsaw blade jig
11/05/2019 13:59:22

Brilliant, the use of the hinges is a bit of superb lateral thinking!

Thread: Sump Plug
08/05/2019 21:16:59

Had this problem on occasion, as a last resort, drill a snug fitting hole in the end of a piece of stout flat bar, place over the square, and mig weld it onto the plug. The heat from the welding will expand the whole shebang, and out it will come, fit a new sump plug, preferably something with a hex head!

Thread: CovMac Lathes
08/05/2019 21:01:05

Bored the five sheave pulley from 1.25" to1.5", or 38mm if yer metrically inclined! will need to drill and tap for a grub screw after I have recut the keyway, as in the previous fitment this pulley had a tanged key in it, and the new motor is an internal key. That's tomorrows job!

Edited By Phil Whitley on 08/05/2019 21:01:46

Thread: 3 phase to single phase wiring
08/05/2019 18:29:18

Provided the cables are labelled, this is not a problem. I assume you want to connect the motor in Delta, if the cables are marked you will have A1 B1 and C1, and A2 B2 and C2 will be connected together on the N terminal? if this is the case, you will need to use seperate connectors, and connect A1 to B2, B1 to C2 and C1 to A2. the motor is now connected in delta for 240v three phase running. put one phase from the vfd to each connection. If the cables are not marked, start by assuming that the A B and C are the "ones" and the three connected together are the "twos" test from A1 with a multimeter till you get continuity, that is A2, and so forth.

Hope this helps.

Phil

Thread: CovMac Lathes
07/05/2019 20:33:05

Glad to report some progress on the Covmac!! Yes I know it has been a long time, but I have been busy restoring other things in the workshop, and thanks to my mate Richard coming over to play for the day, the Covmac motor is fitted! Tomorrow I will bore the pulley from 1 1/4" to 38mm (or is it 1 1/2" and fit it. Pic is on its back! tried to turn it round, which I have already done on my computer, failed, gave up!

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