hello welcome to enots engineering i'm Alan in today's video we continue with fitting the ref
counter to the Boxford lathe by making a bracket to fit onto the spindle end
in the gearbox so let's go to the workshop and see how we do it
so that's what we need to do is fit this here and to do that we need to make a bracket
and fit a magnet somewhere there
and then every time the spindle turns you get a true reading of the speed of the spindle
this is the nut that puts load onto the bearings and we took it off in the last video and modified
it by putting in a hole in it to hold the magnet this is the finished ring
that's the hole i've made for the magnet
now i need to make a bracket for the sensor and fit it on here
i'll mark the position of the first hole ready for drilling
i've removed the three cap heads that hold the grease seal in position
and on the inside of the ring there are two grooves machined that stops the grease coming out
and that seems to work very well because there's no grease coming
out of the back it's all captured in the grooves
what i want to do first of all spot drill the hole
i changed that for the drill for a m4 thread
i've just fitted my spring-loaded centre into the chuck
and i'm using it to guide the tap square into the hole
this is a four millimeter by 0.7 tap
and now i'm using a bottoming tap to tap the thread right to the bottom of the hole
and now i need to drill the second hole in the bracket for the second screw to fit
i've drilled and tapped two holes in the plate so this can go back on the lathe
and it's secured with three capheads
this is the ring where we fitted the magnet
and the magnet just holds itself into the hole
so this can go on
you can see now there's a line on the collar and there's a line on the headstock
so i can align the two lines and that'll set the bearing pressure back to the same as when i took it off
don't forget before i took the bearing nut off i did locate a bar in the chuck
i've just fitted this piece of steel in and that will touch on the saddle
so i have a reference point
when i'm unscrewing the nut the other end this will stop the spindle turning
here's the magnet the magnets held in by a good fit in the hole and its own magnetism
i've made the brackets this is my proximity switch or hall sensor this should fit on here
i'm using two 4mm countersunk head screws
it's just missed the oil filler there
i've still got some adjustment on that
i can come closer but i think it will work at that distance from the ring
so you could pass something to the middle is no problem
now before i put some tape around
don't forget to put the brass inserts and the grub screws back on the collar
to lock the collar in position
what i'm doing now is just put some tape around
the spindle end of the spindle where the magnet is
its not to hold anything on but so it'll be easier
to get rid of any swarf off the magnet just by removing the tape to keep the magnet clean
the magnets there under the tape
just finished fitting the sensor and the wire just misses this oil filler hole
i've come down here and temporary i've gone out at the top of the hinge as a gap
and just be enough for the wire to go through so i can still shut the door
what i'll do eventually is make a cable tie that goes under this bolt so i can hold the cable there
and probably drill a hole through about here with the grommet to send the wire through which will
go into the back of the headstock where there's a cable to conduit to send it back to the front
so this is all finished on this end except for the cable
eventually this will be wired through the back of the lathe under the
the bed to the power supply at the front so this is just a temporary battery box i'll switch it on
turn the lathe one
it gives a display of the revs
you may be thinking what's the point of setting that there because it's
a fixed speed with the pulleys but i'm intending to change the motor for a variable speed motor
so this will come in useful to know what speed the chuck's turning at
this is the new motor i have for the lathe it's a three-quarter horsepower motor
it's 230 to 400 volt
i'll be using this on an inverter to give me a variable speed
that's my next project is to change the electrics from the old
type of electrics of the 1950s to something a bit more up-to-date oh well that's it for today
thanks for watching hope that was useful and we'll see you next time on enots engineering