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Member postings for john swift 1

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

Thread: Straightening coiled small steam pipe.
09/12/2018 22:18:28

Have a look at how coil feed Escomatic lathes straighten the stock

see page 3

https://www.escomatic.ch/media/gallery/machines/d2-d5-flexspeed-e.pdf

John

Thread: DOL starter switch
17/09/2018 20:00:57

Hi Clogs

is this what your looking for

https://www.electricalonline4u.com/2018/01/forward-reverse-motor-control-diagram-three-phase.html

forward reverse motor control diagram.jpg

John

Thread: WM18 Earth Fault - Looks like Controller blew
13/08/2018 21:24:11

as the fault was swarf shorting the semiconductors metal tab to the heatsink

it looks like the speed control is a copy of KB electronics KBLC-240D (or some thing similar )

KB electronics use devices that have isolated TAB's on the 3 diodes & 2 thyristors ( forming a controlled bridge rectifier ) & does not require the insulator

the copies use cheaper devices that don't have isolated TAB's and there for requires the insulator

john

 

 

 

Edited By john swift 1 on 13/08/2018 21:32:13

Thread: Dangerous Ultrasonic Cleaner Electrical Failure
27/07/2018 12:02:42

 

I suspect your the second person to look inside !

Some one else has had it  apart and not reassembled it correctly

 

John

Edited By john swift 1 on 27/07/2018 12:03:18

Thread: DC motors
19/07/2018 11:36:02

It may be possible

but it depends on the motors being identical and the mechanical load on the motors being the same

 

my instinct is to use a 24V supply and a separate speed control for each motor

 

what are you wanting to do with the motors ?

If its some kind of electric vehicle is it possible to have the motors driving the same drive shaft ?

 

John

 

Edited By john swift 1 on 19/07/2018 11:36:58

Thread: MEW 270, Ajax Mill
15/07/2018 18:13:51

its missing from the contents page but is on page 60

John

Thread: Clarke CL 500 switch
22/06/2018 17:10:53

the nearest I have found is this :-

http://cdn1.grizzly.com/manuals/g4015z_m.pdf

figure 17 on page 21 shows a low resolution diagram

do  two of the wires have short wires crimped on to make the diagonal connections to the switch ???

if you test the continuity between the 4 wires from the motor

I would expect you will find two wires   (V1 V2 )  have continuity and they need to be wired across the middle 2 switch terminals

 

the other  two wires (U1 U2)  motor wires will go to the start winding that's in series with a capacitor

and will connect directly to the mains supply from the NV release switch

John

 

grizzly g4015z  reversing switch.jpg

 

 

 

Edited By john swift 1 on 22/06/2018 17:37:53

Thread: Speed Controller
20/06/2018 17:47:22

looking at the video link from blowlamp

https://m.youtube.com/watch?v=X6CCxv3i4No

at 19:59 you can see what looks like the light from a red LED

I assume the speed control is controlled by the amount of reflected light from the movable flag / reflector

the mod with the graded reflector giving a better range of control

as MichaelG says looking up the device part data sheet will make things easier

may be its like this Sharp GP2S700HCP

https://cdn.sharpsde.com/fileadmin/products/Optoelectronics/Isolation%20Devices/Specs_Photointerrupter/GP2S700HCP_03Oct05_DS_D3-A02201FEN.pdf

John

Edited By john swift 1 on 20/06/2018 17:47:59

Thread: Wiring an NVR switch
16/06/2018 19:35:55

I have found a view of the mechanical latch on another D.O.L. starter

when the over load has been reset it holds a normally open switch closed

the dial (or on some units a lever ) adjusts the value of current the latch is released

when one or more of the bi-metallic stripes are heated by the motor current 

exceeds the maximum current you have set as the trip current

the adjustment of the green knob moves  a hinged  insulated bar that the  bi-metallic strips push on to release the latch

dol starter over load mechanism.jpg

 

   John

 

 

Edited By john swift 1 on 16/06/2018 19:55:12

16/06/2018 19:05:41

that's the adjuster to set the trip current for the motor you are using

15/06/2018 23:27:03

single & 3 phase wiring

dol starter wiring single phase.jpg

dol starter 3 phase wiring.jpg

john

Thread: KATSU MINI LATHE
02/06/2018 13:39:07

PS

your machine could be like this Warco wm180 -

http://andysmachines.weebly.com/variable-speed-controls.html

John

02/06/2018 11:52:37

assuming your lathe has a brushed motor

the speed control board could be either like the FC2550 board with 2 FETs controlling the motor current

fc250j.jpg

or the XMT 1135 with 2 thyristors controlling the motor current

xmt1135.jpg

once the control board has been identified it will be possible to give you more detailed help for your machine

John

Edited By john swift 1 on 02/06/2018 12:03:23

Thread: LED strip lighting
22/04/2018 23:01:34

since the LED's require a lower current

either the capacitance of the switch cable

or the snubber capacitor that bridges the triac in a solid state relay as sometimes used in LED security lights with a built in passive IR detector  , (although I believe most have gone back to using relays) can provide enough current to cause the LED's to give a dim light when switched off or more annoying flash on and off

John

PS

old switches that arc a bit before they close can cause the fuse in LED lamps to fail because

 of the use of a capacitor as a wattless dropper in the cheaper LED lamps

at 50 or 60 Hz main frequency the impedance of the capacitor  will limit the LED current to a safe value

but with the high frequency currents produced when the switch arcs

the impedance of the capacitor will be lower and more current will pass through the fuse and LED's

blowing the fuse

 

 

 

Edited By john swift 1 on 22/04/2018 23:16:24

Thread: TDA2030A Audio Amp
15/02/2018 20:58:31

Hi Neil

the TDA2030 was good enough to be used in broadcast audio distribution amplifiers like this

 

audio distribution amplifier with two tda2030 driving balanced outputs.jpg

Edited By john swift 1 on 15/02/2018 21:00:38

15/02/2018 20:18:36

 

Hi Joseph

the nuvistor was used in the video amplifiers for the 4 video heads in the Ampex 2-inch quadruplex vt

https://www.revolvy.com/topic/Quadruplex%20videotape

 

the Nutube double triode valve looks like a gimmick using the technology and assembly techniques from the vacuum fluorescent display

john

 

 

 

 

 

Edited By john swift 1 on 15/02/2018 20:20:04

15/02/2018 14:05:01

Hi Peter


the Nutube looks like an updated version of the Nuvistor valves
used in the head amplifiers in the Ampex 2-inch quadruplex vt machines (~1960?)

Hi Mike

In the past I used to have various band managers trying to tell me how to mix during rehearsals
on transmission I ignored them
and only took notice of the IBA and BT (BT didn't like their microwave links being over driven)

John

12/02/2018 21:09:26

no the TFT displays don't X-ray your delicate bits

if you don't adjust the 143V HT rail correctly to obtain the 24Kv final anode supply to the CRT

a few more HT volts and the EHT goes over 24Kv and emits harder X-rays !!

John

PS

you also get a few hundred solder joint to practice on

12/02/2018 20:52:46

the TDA2030 IC was the audio amplifier used in the Forgestone Colour Developments F500 colour TV kit that I built during the 1981 Christmas holiday

forgestone colour developments 500 series ctv.jpg

Forgestone was one of the component suppliers for the Televisiom magazines DIY colour TV project that started April 1971

television  magazine april 71.jpg

John

Thread: Clarke CL500M (YES I KNOW)
12/01/2018 21:50:59

after looking at Simon's wiring diagram

simon daniels diagram.jpg

 

 

 

I have revised the diagram after correcting the FWD/REV switch -

( in the photo it looks like a 2 pole toggle switch)

revised cl550m switch wiring.jpg

                                 John

Edited By john swift 1 on 12/01/2018 21:56:27

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