hello welcome to enots engineering i'm Alan in today's video we'll be revisiting the indexing
ring i made from a car brake disc i've had a few comments and people asking questions on how how
i did things so i thought it's easier to make a short video and show you also i'd much like to
say thank you for the people that sent me comments when i wasn't feeling too well um thank you very
much i do read all the comments even though i don't reply to them all there'd be far too many to
to reply to so let's go into the workshop and see how we do it so to fit my dividing ring on there
first of all i have to put the chuck on that holds the ring and take this three jaw
off
you can see underneath there's two bolts
two bolts these hold hold
the dividing
ring pin
on most Boxford lathes these holes are already drilled and tapped by Boxford
and they're there to hold a lever if you have the collet set there's a lever that
comes off here so you can open the collet and close the collet so onto these two holes
i made the plunger
and the locator
and all it is piece of plate aluminium drill the two holes so much there
two at the top so that can bolt onto there
the two at the top get this cross piece bolts on so i can slide the plunger across
to whichever row of holes i need and then once that's bolted on you turn the end of the plunger
and it'll feed it in to go into the hole on the disc now if you remember from the first video
this was a car brake disc so there are a lot of holes in here which i don't need
so the four big holes where the actual studs held the wheel to the car and
then for some reason there are three smaller holes which you didn't need they're already in
just put that hand tight so later i can move it into the correct position
back this out of the way
so on the back of the
chuck plate i drilled two holes and tapped them
and then
that goes that way and we put two countersink screws in
there
i think these were to hold the disc to the hub
these bolts hold the chuck back plate to the chuck
that's on there
there's the other side of the bolts so i've got four bolts
that hold the chuck back plate to the chuck and two countersunk screws that hold the dividing ring
to the chuck back plate and then the chuck back plate to the spindle i'll just put that on
so once that's fitted and the chuck's fitted you have a dividing ring there on the back
and all you need to do is line this up and now tighten the two bolts that hold
the indexing arm to the head so the first thing we do is put the plunger in the hole
line it up that lines the arm up and we can tighten the arm
so we've bolted the arm to the headstock which is fixed the plungers in so the chuck won't move
then all we need to do is decide
how many divisions we need to rotate the chuck and to do that we just pull this
pin out
once the plunger is in line with the chuck we can tighten the bracket stop it moving in and out
and we can tighten the pin up
and that locks the chucking position
so you can mill the part that you want to mill or drill a hole through using your tool post spindle
which could hold a milling cutter or a drill release the locking pin remove the pin
the chuck will turn around and you can select whichever angle you need
replace the pin i forget how many holes i've drilled in here 32 i think
so you just count the holes around put the pin back in
and then you can drill or mill whatever you have in the chuck
so the first question i had was how do you fix the arm to the headstock well there
should already be some holes drilled and tapped there will be imperial 5/16 i think
and this second question was how did i fit the ring onto the headstock well i didn't i fitted
the ring to the back of the truck mounting plate and the mounting plate to the spindle
uh make sure it's running true that's about five thou out so i'll just skim the face
and then someone's gonna ask how do you put the holes in well i did this on the on the dividing
head on the milling machine centered up on the centre of the ring and just drilled the first hole
and then move to the second hole just go around also on this i can move this plunger back another
half inch so i can put another row of holes in here if i need an angle that i haven't already got
then when you're finished just take the chuck off
you see i have enough space at the side for another row of holes
and that's the back plate for the chuck with the bolts holding the
it's chuck all I've drilled are two extra holes
that hold the dividing ring to the back of the chuck
so
i always leave the bolts in there so i can find them next time i need them
now just a tip for you when you're using the dividing ring and you've got the locking pin
in remember not to turn your lathe on so to prevent that what i do is open the door where
the belt changes and the interlock switch will switch the power off to the motor so if i turn
the light on by accident the motor won't work so i'm not going to break the pin in the ring
you see i have enough space at the side for another row of holes
and that's the back plate for the chuck with the bolts holding the chuckle
it's all drilled are two extra holes
that hold the dividing ring to the back of the chuck oh well that's it for today
hope you enjoyed it hope that was useful and we'll see you next time