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?|
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
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
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 :(|
I do have a motor and speed control board that I took off my wm18 that you can have for a good price
i fitted a 3 phase and vfd to mine
|Thread: VFD to lathe motor connector|
This one and all the others on the machine that these came off are all the same
Well those are harting brand and as you can see the earth doesn’t disconnect later than any other of the pins
What about these then Robert?
widely used on German printing machinery for 415v3p
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?|
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|
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
I’m sensitising a silver plate with iodine and then making it more sensitive with the bromine so i need the liquid element
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|
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
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?
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
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|
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|
its a NVR switch
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
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