hello welcome to Enots engineering i'm Alan in today's video i'm looking at centres
over the years you use your centres they get worn grooves to get worn into them and i thought
it's about time i refurbished the ones i had so they could have a another life
i'm setting the lathe up to grind the centers using a mounted grinding wheel in a rotozip
and set the compound slide to 30 degrees so let's go to the workshop and see how we do it
i've just been checking my centers you can see these need re-grinding
so today's video will be re-grinding the centers in the lathe
first of all i need to remove the lathe tool and fit this which is a rotor zip i use
fit that in the tool post all i've made is a block with a split in it
that bolt tightens up on the rotor zip it's mounted to the two pieces of aluminium angle
and that will hold
in the tool post so i'll need the rotor zip to come in this way from the back
i need to rotate the tool post around 90 degree
the rotor zip is where the cutting tool would normally be
set this square to the compound slide
that's the grinding wheel i'm going to use
i'll mount that in the rotor zip
now before i take the chuck off and put the center in
i'll dress the wheel so i know that this wheel is running true
this is a single point diamond
right on the end there's just one diamond in the
steel holder and that's what i'm going to use to dress the wheel and i'll hold it in the chuck
just go through between the two jaws
so that it protrudes over the edge of the truck
and then i can just move it up and down to get the height right go across the side of the wheel
okay i've covered the lathe in some material stop the
grit and cut the grip down from getting onto the slide ways i have a vacuum pipe here to catch as
much grit as i can when i dress the wheel so what i'll do is turn the vacuum on
turn the rotor zip on put my safety glasses on and then dress the wheel
now that's true the wheel up now you can remove the diamond from the chuck
and we'll remove the chuck
clean the bore
cover the slides
and don't forget to set the wheel center line to the headstock center line
by adjusting the tool post up or down
set the compound slide to 30
just mark the
center with some red felt tip so i can see where it's ground and most important eye protection
let the grinding wheel finish grinding there's no rush take your time so that the wheel
grinds the surface
let's mark that up again
increase the speed of the end snare doing about 540 rpm
there's the first one done
i've placed the next centre into the headstock ready to be
more red on it more marker pen
there's the next one done
okay so now
i'll put the sleeve in the headstock
that's reduced it from a number three morse taper to a number two
and then add this centre which is the number two morse taper
i'll just clean this centre up
that's okay that's that one done
you see here most of the grinding dust that's been caught on here
so it should be fairly easy to clean the machine down but that's how i do my centres
and there's the four that i ground and this one is one that i didn't grind
if you need a finer finish then you need to select a wheel
that has a finer grit i've not ground them to a sharp point because you don't use a very
sharp point they only get damaged well that's it for today four centres re-ground ready for using
hope that was useful hope you enjoyed it we'll see you next time on Enots engineering