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

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: What does diamond turned mean?
02/03/2020 12:37:38

John H

the knobs in question were supplied as lengths pre knurled and then diamond turned

I was just surprised to learn such an expensive process on a lowly camera part


02/03/2020 08:48:34

So going back to a simple MPP camera knob why would you use a diamond tipped tool rather than a normal tool?

in the 60's to 80's

02/03/2020 08:31:00

I keep on seeing this term applied to mainly aluminium parts saying they have been "diamond turned"

what does this mean?

Mpp cameras have DT parts last made in 1988 so its not a new thing

Thread: WM18 - Broken it again :(
19/02/2020 07:10:37


I do have a motor and speed control board that I took off my wm18 that you can have for a good price

all working

i fitted a 3 phase and vfd to mine

Thread: VFD to lathe motor connector
12/02/2020 13:19:42

This one and all the others on the machine that these came off are all the same


12/02/2020 12:43:20

Well those are harting brand and as you can see the earth doesn’t disconnect later than any other of the pins

12/02/2020 09:03:25

What about these then Robert?

widely used on German printing machinery for 415v3p

ef642be2-91ee-4350-9440-85211821bdf2.jpegAre these illegal?

12/02/2020 08:20:43

Whilst I quite agree that the plug and socket pictured gives me the willys they are fitted as standard to high frequency spindles used in woodworking routers and Cnc machines carrying 240v 3 phase up to 400 hz

Thread: Tapping drill sizes?
11/02/2020 08:48:43

Pipe threads bear no relation to the size of the bore of the pipe that the fitting is for

Edited By Ian Parkin on 11/02/2020 08:49:50

Thread: Where to acquire a small amount of bromine
06/02/2020 17:13:10

I believe that i need bromine which will fume and sensitise the plates

fishers seem to have what i need thanks for that bill

just remains to see if they will sell it to me

06/02/2020 16:11:43

I’m sensitising a silver plate with iodine and then making it more sensitive with the bromine so i need the liquid element

06/02/2020 13:34:48

I need for a photography project a small amount of bromine

has anyone an idea where I can find such?

Thread: Kity W oodwork Machine Switch Again
01/02/2020 12:01:05

e7371268-b52f-47d3-a845-684df2b85cfc.jpegI have found a new diagram for a newer type of unistop switch though I don’t think it helps much

31/01/2020 20:31:27


i’m in sheffield ( south) so only an hour away

if you want to bring the motor to me i can measure everything and set you up with a suitable contactor and overload and wiring and start and stop switches and show you how to wire in more switches

i have large stocks of parts all will be FOC to you


31/01/2020 17:24:11

I think you will need a clamp type meter to read the current as its likely to be drawing perhaps 30 amps on start up for 1/2 a second

I was at a place of work yesterday and the owner was complaining that his saw bench was blowing fuses when cold

on checking my meter was showing readings of 50-60 amps for an instant before settling to 11 amps so not surprising it was blowing 13 amp fuses.. so i wired it to a 16amp plug and put a socket direct to fuse board with a 20 amp mcb

anyway back to your problem clive

The click i was wanting you to listen for was from the motor itself not the capacitor..

the click you heard with the original switch was probably the coil in the switch dropping out.

If you cant lay your hands on a ac ammeter i dont really know what to suggest.

you dont want to burn out any windings in your motor as its a very expensive motor that..

where are you Clive? Geographically?

31/01/2020 09:14:24


make sure that you have permanently mounted stop switches mounted if you do have a switch in a lead

you do need to reach stop quickly in a panic

31/01/2020 09:12:00


so all good so far

when you unplug the motor and its coasting to a stop do you hear a click from the motor?

This is the centrifugal switch which wires in the capacitor in or out of circuit ( if fitted)

On the other hand it may be a permanently capacitor run motor

I'm not sure what the spare brown wire is but it will hold the coil in the start switch in i think

Have you access to a meter to measure ac current? we now need to measure how much its dawing whilst running


Thread: Wiring nvr switch query
29/01/2020 14:51:54


NVR is No Volt Release

so a contactor is nvr

the modern little green and red start stop modules have a latch which is magnetically held in so when power is interrupted the switch latches off so when power is resumed a machine won’t start up

Thread: Kity W oodwork Machine Switch Again
28/01/2020 20:23:37


its a NVR switch

28/01/2020 19:20:54


the original switch (a unistop ) is a strange one (isnt everything french) and as standard it has a NVR function built in which is why Clive wants to change it so he can start and stop the motor and spinning blades remotely

Theres internal wiring in it to the a and b terminals and where the yellow loop wire is

Clive it will blow the fuse or trip mcb/rcd if theres a major fault

but just plug it in for a few seconds to see if it starts first

Edited By Ian Parkin on 28/01/2020 19:22:28

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
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