By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for john fletcher 1

Here is a list of all the postings john fletcher 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Issue 249 Arduino Controller Indexer
23/05/2022 09:55:34

Many thanks chaps for all the guidance. Don't go away, as I think my friend rotary table has a ratio of 60 and the data Sketch) is for 90 so I could be back. John

22/05/2022 11:12:33

Several years ago as I'm sure other readers did, I followed the article on page 64 of issue 249 of MEW and made myself a controller. Recently a friend has asked me to buy the component parts for him as he hasn't a computer and he would also like to make a controller. I can find NEMA 23 steppers motors OK, but when I scroll down and read its specifications I see they have an input voltage of between 24/48. Following the article on page 66 I bought a 12 volt 5 amp power supply and it all works very well and has done for 5 years. I'm confused will 24/48 volt stepper be OK. Will a reader explain to me. John

Thread: Spindle depth stop
05/05/2022 18:28:11

Strangely enough, I am reading in MEW number 50 May/July 1998 page 27 about a back stop which I intend to make. Look out for a PM from me this evening. John

Thread: help wiring a 3 ph coolant motor
05/05/2022 11:46:19

As Peter above says ALWAYS change the power leads. I've seen so many faults when folk change over at the motor terminal box then can't sort then out, most time it will work , but always will at the supply. I used a 4micro farad at 400 volt capacitor between two of the motor leads. John

Thread: Electric bike fault
01/05/2022 17:31:42

Putting a multimeter across the terminals might show 48 volts or close to 48 on no load, doesn't show you much except the meter is working. All batteries eventually build up high internal resistance such that it is unable to deliver the required current, car and torch type are much the same. What you need to do, is the same test on load and for that I suggest you use 4 X 12 volt X 36 watt car head light bulbs connected in series, any type of fitting will do, so long as they are in working order, I got mine from car boot sales. I use RS contact cleaner, certainly systematically go around all possible connections/terminals. Is it possible for testing purposes only, to connect 4 X 12 volt ex alarm batteries in series, by doing so, eliminating the battery failure ?

Our neighbour had to buy a replacement battery for his bike, £600+, the DEALER told him the old one was worn out ???. Incidentally, the very same battery was very much cheaper in Germany but had to be collected. Please keep us posted, as others might have the same problem in the future. John

Thread: Rexon Bench planer
29/04/2022 20:02:49

Have a look on US Grizzly site, Grizzly has some excellent picture on many Rexon type machines, maybe its known under a different name in US. I had a bench type mill given and couldn't find any instruction here in UK, but found it easily on Grizzly. John

Thread: Another Mains Electrical Earthing Situation.
27/04/2022 14:41:41

I suggest you enrol and join Vintage Radio FOC, where there are some real experts on such matters. better to be safe than sorry John

Thread: Hoover Motor wiring
23/04/2022 12:36:35

Well on my Hoover circuit diagram it says you should have a terminal box with terminals marked AZ, C, and B. The run winding which will be the lowest resistance of the two windings (4/7 ohms area) should be connected to AZ & B and the wires should be WHITE and BLACK.. The start winding much thinner wire and much higher resistance should coloured GREEN & RED and they should be connected to C and B. The book says reverse change over BLACK & WHITE Leads. However, there is a second diagram which uses the same colours for the windings but it uses a terminal block with marking of 1,2, 3 and 4. Start winding is connected to 1 & 3 and run to ! & 4 with a link between 1 & 2, in this case exchange White to 4 and Black to 1.The capacitor is connected to 3 & 4 terminals, on older motors they very are susceptible. I hope you have access to an Ohm meter or even a bell set. As others have already said ensure the motor case is definitely earthed before doing any live testing. John

Thread: Leblond Regal 10" drive motor replacement
10/04/2022 16:11:36

You shouldn't have any trouble obtaining a good second hand replacement motor, as so many people are fitting three phase motors and inverters. But before spent your money, how about finding out what went wrong with the existing motor. There are quite a lot member on here will help you out or have done so in the past. With the motor disconnect from the electrical supply could you send a pictures of the motor with the terminal box open so that the wires and markings can clearly be seen. Have you got a multimeter or have you a friend who has one and will give you some help using it. Did the fuse blow or circuit breaker trip out. Has the motor got a capacitor attached to it, some times a lump on the side or top, these are a weak point and are known to fall. I look forward to your reply. John

Thread: Central Heating Control
10/04/2022 15:55:44

My brother in law lives in Canada and in their house each room has a ceiling fan built in, which keep the house cool in summer, the blade can be twisted, such that in the winter the hot air in the ceilings of the rooms is force downwards. I tried a similar idea several years ago using a slow six inch fan and a clear plastic tube, it was very effective but didn't look very good, so out it went. John

Thread: Outdoor Silver Soldering
06/04/2022 09:37:01

I was given a big old battery charger which had a burnt out transformer. I removed all the internals, bought some insulating blocks (can't remember the correct name) from the local builder merchants and cut them to a snug fit inside of the sheet steel cabinet. The box sits on my work bench and I silver solder outside when its not windy. I notice how things get rusty after silver soldering inside the workshop, so outside only. John

Thread: Myford Super 7 QC gearbox Mk1 problem
03/04/2022 10:55:14

Hello Brian can't remember any problems when I changed a broken gear 30 odd years ago. Myford didn't have the gear available any more, I got one from HPC gears at Chesterfield it had all the correct details except the bore, which was to big. I had to sleeve it. John

Thread: Warco BH600G - Motor hums but won't start
27/03/2022 12:14:39

As you say the motor hums, so its not the machine wiring, its the motor. As others have said try the string idea but be very very careful. By using the string idea you are eliminating the motor start winding, the capacitor and centrifugal switch and if the motor runs then one of those three are faulty. I haven't seen one your type lathes, but the motor is available then a capacitor change might be the easiest to do. For test purposes ONLY and with slack vee belt, two old 5 foot fluorescent light capacitor connected in parallel will be OK in place of the original one, after all that its a strip down. If you send me a PM with an email address I 'll send you more details. John

Thread: kerry super 8 problem
27/03/2022 11:50:23

You say the motor starts and runs, so can discount the centrifugal switch and capacitors. Dave has listed other things and I would go with him. Never seen a drill with a capacitor as fitted by the manufactures, they NORMALLY start on No load so don't need a cap. John

Thread: Is this 3 phase motor suitable for delta/VFD?
26/03/2022 17:34:59

In the past 3 or 4 years some one on this forum published am excellent article, with good clear pictures on how he located the Star point and brought out 3 extra wires into his motor terminal box. I have done the conversion for my friends, all on older motors, and as yet to hear of a failure, they bought their inverters via ebay and again not heard of a failure, could be they are just lucky ! I have an insulation tester up 1000volts which I used to give the motors a test before use. Have a go, you have not much to lose, you need to look out for a lump in the windings area which needs to be carefully opened up, and three wires attached. I used three different coloured wires for identification purposes, fibre glass insulation tube and heat shrink and a small amount of resin is readily available via ebay. Best of luck and let us know how you get on. John

Thread: Spark erosion Machine
21/03/2022 17:44:51

I'm making a basic spark erosion machine, following an article in EIM several years ago and which was demonstrated at Harrogate Model Engineering Exhibition. Can a reader tell me the distance between the end discs of the coil former upon which the 1500 turns of wire are wound. Any other info on improvement in light of experience will be much appreciated. John

Thread: Newton Tesla Motor units
17/03/2022 17:05:42

There was an article in MEW several years ago about the speed read out display on a lathe, using a ABS brake counter unit, which was easily attached to my Super 7. Basically it used a VW unit, a simple 12 volt power supply and a display unit. It counts the teeth on the 60 tooth Bull wheel. A friend has a magnet attached to the side of the Bull wheel on his lathe and a counter unit all from Ebay for less than a tenner. Mine cost a bit more at the time. John

Thread: Welding on an old Startrite Motor
14/03/2022 17:34:27

I have done a similar stick weld. On my motor the windings were clear of the outer shell, it go warm, I didn't linger, did a short run, left it for while to cool then a little bit more. I was fixing the mount for small 3 phase motor on my Fobco drill and I was also going to use VFD. John

Thread: Myford Lubrication Oil
12/03/2022 13:43:30

The hydraulic fluid as used on earth moving equipment, farm equipment and many other similar similar things has the same quoted by former Myford. Locally we can take a clean 1 litre milk carton to the ships chandlers and he fills it out of the 40 gallon barrel for £2.50, might be a bit more just now. John

Thread: Myford ML7 feedscrew misalignment
11/03/2022 10:19:21

Out of interest, Scarborough Mates (Shed) has several brand new "Beeston Myford" cross and top slide screws for sale. Should any one be interested please feel free to contact me via a PM. and I'll contact the SHED next week. John

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
Rapid RC
Eccentric July 5 2018
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest