turnbuckle clips in order to secure the lid to the actual trunking itself the lid comes with the
trunking trunking is a standard three meter length and it has already the manufacturers fastenings
on the lid however for my students i'll require them to cut those off and insert our own fixings
for the lid i've chosen turnbuckle clips we're going to look at these in this presentation so
we're going to use a little turnbuckle clip in order to secure our lid onto our trunking first
of all we're always going to work with the lower piece above the consumer unit even if it's at
level one or level two the same piece of lid will be worked with first first of all you're required
to make sure it's the correct length no point going about putting the turnbuckle clips in and
then discovering it's a little bit too short we're going to have to start again so confirm with me
that the lid is the correct length deburr at both ends before we move on to put the turnbuckle clips
in to secure it and we're going to look at that in the next part of the presentation so brought
the trunking lid over to the bench and i'm going to want to come in about 50 mil from each end and
mark the centre of the trunking lid before we go about drilling it we can make those marks using
the scriber drawback using scribers obviously we damage the zinc galvanise in the lid and it can
be prone to corrosion especially put a mark in the wrong place and for the ease of the presentation
i'm just going to use a permanent pen so i'm going to come in approximately 50 mil from each end
first of all approximately there turn around and again 50 ml from the other end
so i've come in 50 mil approximately but now i've actually got to find the centre this is
more of a crucial mark perhaps in the 50 mm we've got to find exactly the centre of that line there
just set my combination square up and position it on the side and hopefully find exactly the centre
and same on the other end
so i've got a little cross now so hopefully i've found exactly the centre of these we use a dot
punch next before we go in and drill what will effectively be three holes to make it bigger and
then bigger and then bigger again in order that we can insert our turnbuckle clip so let's do the
dot punch in the next part of the presentation so position the block of wood into the vice in order
to make it a little bit easier for me to do the dot punching rather than doing it on the bench
we can see we've got our two marks we're very careful to get it in the centre of the cross
lay onto the block of the wood i take my dot punch i find exactly the centre
and this is the bit you need to just take your time with and it's just one
dink in order to make a mark of which will be the position for the first hole to be drilled
then likewise turn around take your time to find the centre of the cross
and again just one dink in order to mark it we're not trying to make a hole with the dot punch we're
trying to give us a mark to start a hole so i've got my two positions here and i'm now ready to
start drilling which effectively will be probably a three mil followed by six followed by a 10
in order to fit these turnbuckle clips into the front of the lid let's see that in the next part
of the presentation so ready now to drill the first hole was probably a three mm high speed
steel drill bit that we're going to put through we've got the dot punches in place i've taken
the block of wood back out the vice i'm not going to just put the lid in the vice itself
we can bend it this is quite flimsy trunking lid so to increase the jaws of the vice and give us
something to drill into so i'm not bothered if i drill goes through obviously the metal front
lid and into the wood at the back and position the block of wood behind like so making sure the area
that i'm drilling which will be about here goes through and into the wood itself so position it in
like so and now we're ready to drill through from the dot punch through the front lid into the wood
at the back in the next stage of the presentation as i'm now about to drill my first hole i'm going
to put on my safety goggles and i'm going to drill that first hole using my three mil so with a three
mil high speed steel drill bit inside my Dewalt drill i've also got it set up with a six and a
ten ready for the next part of the presentation as well so let's go through with the three first
so i've gone through my dot and i've gone into the block of wood i can now move it to
my six mil high speed steel drill bit
next and again through and into the block of wood
and then the final one is a 10 mil high speed steel drill bit
got to do the same on the other side and then i've obviously i deburr it before we
put the turnbuckle clips in so let's flip it over and do the same on the other side
block of wood round position it so it's the dot and the block of wood around the back
into our vice firm but not overly tight because you don't want to dent the lid itself
three mil first which that one isn't three mil first which that one is
three
six and the one that's more tricky tends to grip a
little bit with this one just be careful on the 10 so on the 10.
and both ends are now done we've gone three six ten on both ends we now need to deburr it and i'll
show you how to put the turnbuckle clips in after that so i've deburred my lid around the two 10mm
holes i've separated out my turnbuckle clip into its three parts so i've separated the front which
is rotated with a flathead screwdriver the washer and the bar at the back which will secure the lid
and the trunking together so i've separated those out and it's a case of on the front side
the washer followed by the part which is rotated and you have to press reasonably firm now in order
that you can put the bar through the back so if i rotate that into the correct position push it
firmly forward and then we push the bar in which can be really tricky to push it into its position
there we go so i've pushed it down into its position and we can see now when it's rotated
it will fasten to the trunking and hold the lid into position so we do that on both ends
see what i mean about removing them they can be really quite tight in order to pull them apart
the washer is in place position the washer on the outside followed by the head push firmly in so
i'm pushing nice and firmly in push my centre bar now into position until it feels like a mini click
and then we're like so so our turnbuckle clips are in place we can now take it over to the
exercise to see if it fits correctly so the final stage is just to fit the lid
we must use a really large flat headed screwdriver these are only quite soft plastic if you use just
the electrician screwdriver or medium flat tip whichever you want to call it you can damage
the plastic around these ends so large flat tip screwdriver the largest we've got in our workshop
lid's held into position like so push firmly against it and rotate firmly against it and
rotate and you can see now how the lid is secured against the trunking at the back no gaps either
end and that's the lid fitted with the turnbuckle clips i hope this video has been some help