in a previous video i clip twin and CPC cables to a wooden board and show you how to get it flat
with equal clipping distances and i said i'd go on and do the bend of a twin and CPC cable
so we're gonna put a nice smooth 90 degree bend in it so in order to do that we're going to use
some of the skills we did before so we've taken a piece of cable from college might come off a drum
it might be second hand and we can do what we did in the other video to start with and that's get it
flat four fingers underneath thumb on the top and we're going to drag it against the surface and we
do this many times as shown in the previous video in order that we can get it flat to the surface
so as i pull it down there if i was to hold it in those two positions it's already really flat
so we're going to do that several times throughout the length of the cable i'm not going to do such a
long clipping distance this time so i'm dragging it down as we go my thumb gets warm remember at
your college you might be wearing gloves and then i'm going to start to put the bend in it right so
we're going to put the bend in it this time it's eight fingers on the outside and two thumbs on
the inside so i'm gonna take my fingers and i'm just gonna pull a slight bend trying to keep it
flat and then i move my fingers along a little bit take my thumbs and i pull again and i'll go
a little bit further along pull again and you can already see that we've started to make that
bend a nice smooth bend as well so we'll go again once we've got it where we think we've worked it
we're just going to start pulling that bend around to 90 degrees so we started working
it and we can see how the inner radius there is nice and smooth and that's starting to look
like a 90 degree bend we then have to go back to the technique we saw before hold on to the
cable across the bend and drag it down come this way hold on to your bend and you drag it down
and we're all about just getting a nice smooth bend to start with okay i don't
want it too tight okay the bend is just about feel at this stage so we feel for that bend
so when we're happy with our 90 degree bend we can look at putting into our
job in this case we've got a light switch box that we're going to put it into
i'll take my side cutters i'm going to shorten this cable down a little bit
from the previous time we used it again i've cut it just going to drag it again
drag again i can pop it into the box making sure i don't scuff my cable we go into the box and we
go about a length of the box longer than it was so the box length plus another box length there
so if we look now we've got our cable pretty much into position it's pretty flat and we're
going to use the same technique we did before about working out where our clips go well from
a previous video when we measured it we measured from our straight edge to the center of the cable
to be 19 and a half centimeters or 195 millimeters so we'll do the same again
we've got our position we're going to put our top clip in first using our one to 1.5
millimeter clips again we saw that in our previous video they're slightly big for one mil and this
is a one millimeter squared cable but we'll get away with them we're 19 and a half to the center
which is approximately there and now we've got to make a decision of where we're going to pin
our cable now i like to pin it so our nails will run down the inside of the bend so i'm going to
put the clip this way around and i want to go pretty much on the first straight part after the
bend so we've got a bend there and on the first straight part we said 19 and a half which we're
just about there the center of the cable and we're just after the bend and i'm just going to pin it
so i've not put that now all the way in
and we can carry on with our technique now hold on to our bend four fingers and a thumb drag it down
and into our box so we should find that that's not too bad
now we're going to work out where the other one off the bend is if we made the center of the bend
here with a pencil mark i want to be equidistance for the next clip so the clip is going to go
it's going to approximately there let's just have a little look yeah i'm happy with that
just pin it again in case i want to change my mind knock that one into position hold on to it
drag away it's lifted slightly that because the clips themselves aren't fully down so
it has lifted slightly that is a little bit of a concern but we'll see what happens to it when the
clips are driven in into position so we come now down we know where our last clip is going to go
which is about 15 mil from our box so again 19 and a half to the center of that cable and 15 mil up
making sure the nail stays on the same side so we're on the right hand side for the nail so if
we look now we've got our nails matching the same side and i've said in a previous video that i like
my clipping distance to be a maximum of 300 and i'll leave an eye above my head i'll leave a link
to a video where i talk about clipping distances so i'm going to measure this gap and that gap is
3 um 390 mm or 39 cm so i'm going to need to half that so we know half of 40 is 20 and then
obviously we've got to come back another half so we want this to be 19 and a half put pencil
markers just so you can see it so 19 and a half from clip to clip let's check it this way clip to
clip 19 and a half okay so that's in the correct position and what we're going to do is come off
our hard edge here and it should be 19 and a half and it is so we should be clipping just there now
make sure we get it around the right way so the nail needs to come my side and pop into there
and then just pin it again so why we pin it is is when we look down so when we come around and look
down this cable we're hopefully trying to see that it's straight if it isn't
we can wiggle out the clips and move it so it is straight we're going to need one more clip just
to hold this out of the way so i'm just going to pop one just in there and then cut off my cable
just so when i put my board away at the end of the lesson it doesn't get in anyone's way
so let's have a one more look down the run of it so i'm looking down the run it looks dead
straight and dead flat so that's dead flat to the surface and we can now knock these in
remember to hold your hammer down at this end not at this end
and we're looking just to hit the top of the nail
and not miss and hit the cable
the one to be careful of is always the one down here near our box just take a little bit of time
and there we have it we've got a equidistance clipping distances it's flat to the surface our
bend is flat as we can get it as we come around with a nice smooth radius just there on the cable
now if you want to see how i work out bending radiuses of cables check out the video just there