spits meds can be a common problem and
can occur in most metals but mainly
aluminium are aluminum in this video our
we're going to look at three ways to
repair damaged threads if you have a
damaged ice to it to the bolt like this
you will need to replace it in some
circumstances when you get a stripped
hole you can actually drill the hole out
larger and tap it to the next tapping
sighs OH so on this component we've got
three good screw holes and one of them
is stripped completely which is that one
and this is only set up as an example so
what you can do in some instances ease
you can actually drill that out and you
could tap that two eight millimeter and
use an 8 millimeter bolt a big problem
on side weave steel floor players etc is
that the holes gets to it and we often
remove the m10 bolts and drill and tap
the holes to m12 if the m12 gets to it
sometimes we drill and tap the holes to
m16 etc that is providing you our enough
room to do that and there is enough
material for you to do that safely
without the risk of breaking the
component so if you can this is
obviously the cheapest and the easiest
way if you do get edge to it thread sort
of starts off with and want to get the
correct sized drill bit
these are m6 taps hold some we're going
to go to m8 for that one
well sweet snooze make sure that we
follow the existing hole and drill up
straight down and of course if you can
it is a lot easier doing this on a
pillow drill
[Music]
after all that's haul out to six point
eight millimeters which is the correct
size for our m8 tab you will notice that
we've got three of these so that is the
first tap that we use that is the tip
tap we then use that one which is the
second tap that are slightly less of a
taper on it and then finally we use that
tap which is the plug tub and they are
the tub that you need for a blind hole
now in some cases you will only get one
tap for example this is out of a kit and
that is an m12 tap so we're just going
to put the tip it up into the tap wrench
I'm going to apply some cutting paste to
the end of that and it is a bit flaws on
that I think like saw and I'm going to
proceed to cut the hole when you do this
you need to keep it straight and what
we're going to do is we're going to turn
it in a clockwise direction and we're
going to give it two or three turns and
then we're going to go back to break off
the chip so a couple of turns and then
turn it back that's now about site so
we're at the bottom of the hole these
are of course only shallow holes we then
take the second tap you can use oil when
you're doing this or you can use a
cutting I tapping fluid I prefer to use
the paste because it doesn't go
everywhere once you've got a start if we
give it a couple of turns forwards and
then one back
and then we come on why not for if you
can't afford them you are better off
with a decent make of tap some cheap
taps are not much good at all and then
finally we're going to take the
bottoming tap again we'll go a couple of
rotations forwards one back to break off
the chip we can then blow any swipe out
of there we can then take the m8 bolt
and we can screw that straight in there
so that is always an easy option
providing you've got enough sound
material around it to be able to do that
obviously in a lot of circumstances you
will not be able to do this and then
you're gonna have to use a helical type
kit or a Time suits which are we'll be
covering next
this seal assembly is using industrial
process and dissolve at 50 years old on
top of this sits a steel cap which is
sealed to prevent water ingress this is
fixed to the assembly using six
quarter-inch UNF cockade balls but you
can see one of the holes is stripped
completely and will need repairing
[Applause]
helicoil tab kits are popular and are
less expensive than time suit which will
be shown where to this particular kit is
a recoil kit and comprises of the drill
bit the tap the insertion tool some
inserts and the punch tool to break off
the tank to start off I'm spraying some
cutting fluid into the hole and
proceeding to drill it out using the
supplied drill bits this steel is very
hard to drill as it has a chemical
coating that looks like lost but is much
of topic
once the hole is drilled I can pop it up
into the tap range and proceed to tap
the hole
it's important to keep the eat up as
straight as possible apply a downward
pressure whilst turning the tap in a
clockwise direction then turn the tap
the other way to break off the chip
once you have gone in all the way you
can reverse the top now I'm blowing out
a nice wife or tapping fluid using
conquest at air this is one of the
inserts as you can see it looks like a
small screen this fits onto the
insertion tool and this screw into the
threaded hole until it is flush I just
slightly below the surface
[Applause]
if you look at the insert and as a tank
on the end which now needs you're moving
to bear this off use the punch and press
down on the tang very quickly and firmly
and the tang should snap off this then
leave you with the Ripper which means
that you can continue using this
component forming over it 50 years
helicoil tag kits are inexpensive and
will do the job for the majority of
people you can of course get different
quality kits ranging from cheap kits to
expensive bought much better quality
kits
sometimes the helicoil type inserts get
damaged and end up looking like this
time certs can also be used but for most
people these are too expensive but if
you're doing a lot of dippers a kit like
this can be invaluable
this iconic component has three god
holes and on top of the balls another
component and this hole at the end there
is actually two it
to prefer this I'm going to starts off
by putting the drill bits into the top
range and it would obviously be easier
using an electric drill for this but for
the purpose of this demonstration
because it's only soft aluminium I'm
just going to use it in the top range
like soar so I'm going to put that in
there
we're just going to keep that straight
and we're just going to drill out the
hole
and obviously this is very easy
so we've now reached the bottom of the
hall and now reverse that out we now
need to swap the drill bits or before
the seat cutter
and obviously we're gonna have to press
down on this as we rotate it
and of course it's nice turning in a
clockwise direction
and we just need to continue with that
until the depth stop which is the
material
can then remove that we do have a bit of
swipe in there so I'm just going to blow
that out now we need to tear the tap and
proceeded to tap the hole
obviously if you're doing this in steel
it would be a good idea to use some
lubricant we can then unscrew that
we can now blow out the hole again
obviously it is important when you're
doing a job like this to were safety
glasses we can then take the inserting
tool and we need to apply a drop of oil
to that we can then take the bushing and
we can screw that on to the insertion
tool
can I take an screw that into the
threaded hole
once we get in there we then need to
continue turning that until it gets
tight so it will get noticeably tighter
and then once it gets tight we can
unscrew the insertion tool
once you've done that you are then left
with a perfectly repaired hole so that's
three ways that you can repair damage to
it I'd like to thank you for watching
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