How to drill A Bolt
How to drill through the centre of a bolt | drill bolt guide
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in a previous video I used some cap head
or socket head bolts like that with a hole
drilled down the center to remove some
broken bolts obviously if you've got access
to a lathe with a three jaw Chuck
drilling something like that is
incredibly easy I can simply put it in
the lathe and drill straight through it
with minimal setup however most people
do not have access to a lathe so in this
video we're going to drill directly down
the center of a bolt like that using a
pillar drill. To set up the pillar
drill you will need either a piece of
threaded bar or a bolt the same diameter as
the bolt that you want to drill through. Here I am cutting the head off this M12 bolt
before we drill this in the pillar drill I'll just show you the easy
way on the lathe simply put the bolt in
the chuck ensuring that you grip it
with the head insert an m6 drill bit
into the chuck normally would use the
coolant feed but in this example I'm
going to use metal
working spray
if you're not familiar with drilling on
the lathe you need to peck at the bolt so
you go forwards then back it off then go
forwards again and repeat this until you
are through the other side
if you try and go through in one movement there is a
chance that the hole will not be dead
central as the drill bit can wonder, or so
I have been told
this is the bolt with the hole drilled
dead down the center now it's time for
the pillar drill. start off by putting a
piece of threaded bar in the chuck with
the nut screwed on to the end adjust
the table so that the nut can be
gripped in the drill vise
now lower the drill so that the nut
sits in the jaws of the Vice
position the nut so that the vice will not
move the nut when the jaws are fully
tightened
you need to get the vice in a position
where you can bolt it down to the
table of the pillar drill you can now
carefully rotate the vice until the bolt
holes line up in the table and bolt it
down ensure the bolt or bolts are
really tight
you don't want the vice to move
now undo the chuck and unscrew the
threaded bar
get the bolt that you want to drill
through in this case a M12
socket or cap head bolt and the thread
a nut onto it. then thread the bolt
into the nut in the vice screw the bolt
all the way down then tighten the top
nut using a spanner. this will ensure that
the bolt is held tightly
you can now get the drill bit in this
case a six millimeter diameter one and
fit that into the chuck by doing it this
way you can be certain that the drill is
in the dead center of the bolt you can
now proceed to drill the hole
ensure a cutting compound or coolant is used
to prevent the drill bit from over heating
in less than two minutes you should be
through the bolt and now have a useful
drill guide for broken bolts
I hope you found this video useful if
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