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Member postings for Ian Parkin

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

Thread: Kity W oodwork Machine Switch Again
28/01/2020 17:44:45

Clive are you happy to try things ? I realise that some dont like high voltage messing about.

But if you can try this and report back

remove the switch completely

connect the earth from the plug to the motor

connect the live (brown) to red(b) and the brown going to the capacitor (dont lift by this)

connect the neutral (blue) to blue (d) black (f) and brown (c)

connect the blue from the capacitor to yellow (a)

insulate the brown (e) not sure what this does as yet

then try plugging in the motor should run

report back if it does or doesnt

Ian

28/01/2020 14:53:22

Clive

is the original switch simply on/off or is it 3 position forward/off/reverse?

Thread: Desoldering how to?
26/01/2020 18:17:16

GB

Yes i did manage it eventually

I’ve been messing about with electronics since the early 70’s full subscriber to practical electronics for all the 70’s then on to a degree in electrical and electronic eng

i’ve got irons from 10watts to 200 watts

but suddenly i find modern boards so difficult with smc and double sided boards...I never thought I’d get to the stage where i cant read a resistor colour code now i can hardly see them (smc that is)

anyway the switches were slightly strange in construction (flipped from side to side) the tracks were extremely fine <0.5mm and where the pad was connected to a large mass on one side it was very difficult getting heat in to both sides at once

I’d destroyed the switches but carefully metering the contacts enabled me to trace the wiring sense of them and soldered in flying leads along to panel mounted switches

after all this the circuit still works (surprise)

Its a stepper motor driver controller for a camera slide rail I’ve made up fro video use...but the way those switches are mounted and used made it impossible to mount in a case.

24/01/2020 12:57:28

It’s double sided with very small tracks and it’s a dpco switch

24/01/2020 12:25:49

This is the board in question as you can see the switches are hard to the board

7acd6ae7-7331-426d-99c5-f31b28b6277f.jpeg

b19baaa3-f3f6-4859-b787-09c07afe1889.jpeg

24/01/2020 12:20:25

How do people desolder components?

i have a circuit board with a couple of small switches that i want to remove and place remotely...so not wanting to use the removed switches..

the board is double sided

the switches have 6 wires all told on a 8mm square grid

how best to go about it?

I’ve got a solder sucker and desoldering tape but never had much luck with using either

Thread: Colchester Student Mk1 Won't Start
23/01/2020 10:21:53

Richard

I would say that my student is very much like yours with regard to spinning the chuck in neutral

Mine has a 3hp motor driven by VFD also with a matrix clutch

if yours has only a 1.5hp driven by a converter i'm not suprised you cant get top speed and long run ups to even half speed ( 600rpm)

You are welcome to come over and have a look at what a student with vfd can do ( sheffield)

Ian

Thread: Dunlop Taper Bushes
20/01/2020 11:56:53

My supplier calls them weld on hubs

Thread: Anyone near me willing to help with bits & bobs?
19/01/2020 11:19:17

I’m in sheffield if you get stuck

Thread: Drilling holes using pillar drill - work wobbling
16/01/2020 11:57:26

Try bolting the vice to the table and make sure that the table is locked to the pillar

Thread: Electric welder at Lidl
12/01/2020 19:19:11

Sorry stand corrected but cheapest in the Uk seems to be £700 from china £350 so hardly Lidl price territory

12/01/2020 19:16:31

Can you show a link to a plasma/welder?

12/01/2020 18:47:01

Nigel b

plasma cutters and welders are very different in operation and currents I’m not aware of any dual purpose machines at all

plasma’s are generally in these small hobby machines only 40 amp

mig welders you want 80+

It will be interesting as to what turns up in store as the description is all mig wireless welder and the pics all plasma cutter

Edited By Ian Parkin on 12/01/2020 18:47:41

Thread: VFD Question
12/01/2020 11:57:06
Posted by Steviegtr on 10/01/2020 01:42:45:

. A 3 phase motor with 240v windings which it must have to work on single phase will not have the same torque as a 3 phase motor connected to a 3phase supplied inverter.

Why is this Steviegtr?

Thread: Electric welder at Lidl
10/01/2020 17:40:40

Well those photos are of a plasma cutter

Thread: VFD Question
10/01/2020 10:13:09

Steviegtr

so just to be clear

a 750watt motor running delta connected to a single phase VFD outputting 240v

and a 750 watt motor running star to a VFD outputting 415v but fed from 415 3 phase

which one has more starting torque? And why?

And Like NDIY i have run many 415v star connected motors of a single phase VFD outputting 240v with no apparent detriment

Thread: Kity Woodwork Machine Switch
05/01/2020 22:25:31

Your thermal overload may only be thermostat in the windings it’s hard to see from your photo how many wires dive into the motor itself

your current is marked as 6.9 so you need an overload say about 7.5 or so

Thread: Strange washers..are they justified?
05/01/2020 13:40:06

I wouldn’t bother with any washers on that job if you have bought cap head screws (alum) allen heads?

i would use a touch of locktite on the threads

Thread: Kity Woodwork Machine Switch
05/01/2020 09:20:05

Clive

the round cylinder mounted on the side is a capacitor which kicks the motor to start in the right direction.

that motor you have is a French one ..they always seem to be able to do things electrically differently than anyone else.

the switch is a contactor with a rotary start switch and it only relies on the plug fuse for overload protection

a modern starter has a thermal adjustable trip to protect the motor better.

its best to look after that motor as it will be difficult to replace.. as its double ended ?

04/01/2020 13:38:37

Clive

you can wire in as many stop switches as you desire in series with the stop switch in the diagram.

its always best to put an overload in as well with a motor (although one wasn’t there with original switch)

I didn’t mean a pendant coming down from the ceiling (though nothing wrong with that) just a small box with start and stop buttons on a trailing wire and a magnetic base so it can be stuck somewhere convenient whilst you use the part of the combination machine you need

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