in a previous video I demonstrated how to use one of these which is a guide
that I've used from a bolt by drilling a hole down the center I will put a link
in the description to that video and also the video on how to make one of
these guides this video have got a bolt which is shared in this hole
and what I'm going to do is I'm going to shear off a tap in there and then we're
going to try to remove the sheared tap I'm now going to put the guide in which
I've made then I'm gonna tighten up the nut at the back there
so I'm just going to drill that out with the correct tapping size drill
I'm just going to swap over there to a cobalt drill bit
so I've now drilled a hole I'm now going to break the tap off into the bolt
obviously that's broke and it really bad place it's not where I wanted it to
brick so I'm just going to give it a helping hand you can see that has broken
off and that is much better we've now actually got that deep in the hole
not only have we got a broken bolt in there we've now got a broken tap in
there as well taps are made out of a similar steel to
a screw extractor just a word of warning about screw extractors / taps etc
they are made from a very tough steel but it is very brittle it's absolutely
critical that you were safety glasses if you're attempting to deal with something
like the may break the shards that actually come off that when it breaks
are actually like splinters of glass and they will quite easily embed
themselves into your skin or your eyes so it's absolutely critical to wear
safety glasses so at the bottom that you can see there's a tiny piece of the tap
and that is going to stop me from getting the guide in properly so I'm
going to try to break that off and that I've actually cracked off normally in
situations like this you ever get a broken screw extractor or a broken tap
both of these are very hard steels and they are incredibly tough to drill out
you can't actually drill these with a normal drill bit you have absolutely no
chance you could possibly use a carbide drill bit like that but these are very
very brittle you have to be very careful with carbide they will drill tough
steels but if you break one of those it is very difficult to get it out probably
one of the only ways to get that out is to have it spark eroded afterwards
you could use these to drill it out these are made by ARTU and these are
multi-purpose drill bits these will drill virtually anything but as you can
see a few of these are seriously battered
especially the size which I'm going to need which is about five or six mil you
can see that that is absolutely no use whatsoever now so I can't actually use them
so that's one of the drill bits that we're going to be using which is a
JCB Diamond-tech hole saw they have impregnated with diamonds on
the end that is one that I've used previously to drill 60 holes in a Granite
tile and I also used that to drill a tap a few days of weights to put
that in the vise that is it grew up in tap and actually managed to drill
through that using this hole saw this kind of Steel is incredibly tough it is
very very difficult to drill it you can't actually drill out using a normal drill
bit or a cobalt drill bit you have absolutely no chance so I'm going to
take the drill guide that I've made and I've actually made a short version of
that so I'm now going to tighten the drill guide in there to drill out the
broken tap I'm going to use that one, which is a 6.5MM diamond
hole saw that as a perfect fit in there and eventually we should be able to
drill out that broken tap so I'm now going to dip this in some water I will
keep dipping that in the water every five seconds so this is going to be a
very long process but it is one of the few ways we can actually drill out a tap
and I've just actually removed the bolt so we can actually see and you can see
that in there it is actually cutting the tap away I have to point out this is a very
slow process and if you can do it's much easier getting its spark eroded
but for a lot of people that is not an option
obviously this job is very time-consuming and I've been drilling that
for about 30 minutes now and we're approximately halfway through so I can't
stress how important it is when you're doing something like this to go and take
a break you do not want to let a job like this get on top of you it's
important to go out have a cup of tea going up something to eat etc never let
a job like it's wind you up or you'll just end up getting mad with it
and rush it and end up breaking something to apply this can't be rushed
you really do have to take your time with them on that note I'm going to go
a cup of tea
we've got far enough in that we no longer need the guide bolt so I'm just
going to remove that and I'm going to continue to drill
I'm actually just going to change the drill bit over now that one has definitely
had a lot of wear on the end there but I'm sure that will still go through
a porcelain tile or a granite tile however I'm going to swap over to a
brand new hole saw and we're going to see if that will continue cutting
and we've actually just got the tap stuck in the end of there now so we've actually
cuts the core straight down the center of the tap I do have to say that now
did take a while and it was probably drilling that for a good hour or so but
we've now got the broken piece of the tap and we've got a hole down the remainder
of the tap which is approximately so long so now we have a chance of getting
the broken tap out and the bolt that is still stuck in there so that's the
piece which is approximately one inch long and if you now look in the hole you
can actually see that we've successfully drilled out the broken tap we now just
need to drill out the remainder of the bolt so drilling that out will be very
easy I was going to use this screwdriver I'm just going to use that to get the
depth of the hole and then I want to transfer that onto a drill bit because
we don't want to drill too deep so I'm now going to take some cutting paste and
then I'm just going to drill out the remainder of the bolt that's in that
hole
now we've done that I'm just going to clean the hole out. you can then take an M12 tap then
apply some cutting paste onto that and I will proceed to re-tap the hole
I'll then just give the tap a clean I'll just clean out the hole and then we'll
just proceed to tap the hole again
It's important that you don't try and rush any of this the last thing you want to do now is
break off the tap. you have to be aware that there is some steel left in the
threads in there and we're actually trying to break out those bits of steel
and re-tap the aluminium so you do have to do this very carefully and very
slowly
if you take a look on there you can actually see some of the bits of the
broken bolt so that's why it's important to keep stopping to clean out the hole
obviously if you've got a compressed air supply it's a really good idea just to
give that a blow out and get any of the debris from within the hole
well that hole is now clear I can now take an m12 bolt I can screw that in
there absolutely no problem at all, it's actually gone a bit tight just wind
it in the rest of the way using the spanner
you can see that will hold absolutely no problem at all
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