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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.

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Thread: Eyesight problems
24/02/2012 08:43:48

Regarding contact lenses and arc welding that was discounted years ago, we had posters made at work all about the claim then had to have them removed.Keep the helmet on,any flash is bad for the eyes.Ted

Thread: seaside miniature railways
21/01/2012 10:52:53
I live very near Scarborough North Bay railway and have friends who work there.I have a copy of Scarborough North Bay Miniature Railway Golden Jubilee 1931-1981 which was 50p. and which I can copy for you.Send me a PM with your name and address.
Thread: Fitting Power Feed to Chester Super Lux Mill
10/12/2011 09:08:47
I made a power cross feed using an up/down car window motor which are designed to go forward and reverse, not all wiper motors are.I used gears from an old photo copier, I made a sliding dog clutch and made the simple speed controller from a circuit in MEW years ago.One thing I should point out most of these simple circuits say use a 5K linear pot,I've found that a multi turn pot is much better for fine speed control rather than a cheap 270 degree type.
Thread: Bridgeport leadscrew adjustment.
20/11/2011 08:51:31
I have circuit diagram and other details of the Bridport electronic controller for the power cross feed, if that is any help, would you like copies ?. Can one send personal message on this site? if so, send me one with your phone number and address.
Thread: Interference Filter for Variable Frequency Drive
10/10/2011 13:28:09
Have you thought of trying a filter from a washing machine, they all have one fitted. and are pretty good and cheap.Ted
Thread: Brooks Delta Configuration/Inverter Information
10/10/2011 10:52:11
I have 3 pre ownd inverters all different makes and the control circuits are all low voltage so it is easy to make your own remote control box as the earlier diagram shows. One needs a 10K pot for speed control and the other two 5K. A useful thing about inverters you can flick the forward and reversing when screw cutting up to shoulder, the motor slows down and ramps up in the opposite direction.Oh, that's another useful attribute of inverter control ramping up no sudden on.I have noticed that some internal controls are not changable on some ebay advertised inverters. When I bought two of mine from an auto jumble sale I got the manufactures phone number from their web site and gave them a call, they were extremely helpful.Regarding ventilation, I mounted a piece of sheet alumnium with a slightly bent front about 50mm obove my inverters this deflexts any swarf or dust. All 3 were intended to be cabinet/panel mounted,fortunately I had a selection of boxes in which to mount them in (one each) I cut a hole in top and bottom fixed some fine mesh over the holes, then as I said fixed the dust/swarf deflector plate, that was 3or 4 years ago.i hope that gives you some ideas,Ted
Thread: Electronic Speed Controller
24/08/2011 19:59:13
I have made quite a few speed controllers for various similar motors using PWM and MosFets, a small pcb from RS together with a 555 timer. Please send me a PM together your phone number I will tell how to make one, not expensive.Ted
Thread: Sheared Drawbar
11/02/2011 08:36:59
I once drilled a motor bike side car spring using a masonary drill, slow speed,lots of pressure and allowed the hose pipe to give cooling and flush away the swarf. Large size 5mm tunsten carbide printed circuit drills are very useful, enabling one to drill very hard steel.These drills used to be sold at Amatuer Radio events.Ted
Thread: 3 phase Bridgeport
13/08/2010 13:38:07
Didv you buy the bridport and do you still need the information ?.
Thread: Bridgeprt on an inverter
22/07/2010 14:02:50
Regarding the Bridport table feed, it is fed via single phase  transformer 240 v in 110 out and the motor is 110 volt shunt wound DC, with a circuit board made by Erskine Systems of Scarborough.The Coolant motor can be made to run from 240 single phase by altering the motor windings from 415 volt Star to 240 Delta and wire a capacitor between one leg of the single phase and the vacant terminal.The capacitor value needs to be in the 2 mF to 4 mF range a bit of trial and error is needed, if the motor get hot decrease the cap value. I have table motor control details and circuit diagram.Ted
Thread: Engineering Course at Eastleigh College, Hampshire
30/05/2010 13:10:04
Hello Brian, how about  going South down the coast to Yorkshire Coast College, where we will be up and running once again late Sept early Oct. Your neighbour Nick has already book a place, so could share transport. I think we have a vacancy, not exactly sure .Ted
Thread: How do I demagnetise tools and parts of machines
08/05/2010 08:51:25
De-magetising. 
I have a home made growler, which I use for simple testing of armatures,and for de-magnetising, growlers  were  found in most auto electrical shops in the days of dynamos. To make the growler I used  a mains transformer 240/55 about 10amp rating with the secondary (55volts) coil removed,the core is best described as square 8 shape. I bound up the remaining  coil to ensure no steel particles could get in whilst I milled away a vee in the top portion of the 8 shape, deep enough to lay an armature in. To de-magentise a piece of metal all I do is switch on and pass the tool,metal or what ever through or across the vee. My growler doesn't over heat and it can be used to remagnetise small DC motors, like those found in childrens train set. Observing polarity place the complete motor in the vee connect the coil to a source of DC, switch on for a moment and the motor is like new. Alternativelydischarge a large capacitor across the coil and that has the same effect.Ted
Thread: MEW 162 - Phoenix Battery Drills
18/03/2010 16:42:53
I have made a power supply and run 2 of my 18 volt drills from it, the PSU also dubs as variable volt power supply using a 5 amp  voltage regulator chip.I remove the duff battery, drill a hole in the side of the battery box, put a substancial piece of flex through the hole, solder the flex to the original battery connection and partially fill the box with sand and cement to ensure it stands upright. Regarding over voltage, I have never as yet  had a motor or its electronics fail due to over voltage.Folk get to involved with imagining problems which just might exist. I have other drils which work well after giving the cells some extremely rough treatment. The problem appears to be that owners never fully discharge the Ni-cads, but keep topping them up.I have Ni-cads more than 15years old and still keep working well, not as they did when new but useful never the less.
<< First < Prev 40 41 42 43 44 45
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