hello welcome to Enots engineering i'm Alan in today's video i'm looking at the
back gear on the Boxford lathe checking the belts for any signs of oil or wear
and checking the drive pulleys in the cabinet for signs of oil or wear
now a few weeks ago i turned a thread it was a one and a half inch by 18 teeth per inch unf and
that thread required the back gear to be engaged now when you engage the back gear on the Boxford
you need to oil the centre pulley in the headstock and to do this there's a small hole on the front
of the machine that lets you put oil through into the headstock now the problem with this is you
can't see how much oil you put it in if you put too much in it ends up everywhere in the headstock
today in the workshop i'm having a look at the belt drive i have a feeling it's slipping
and that's because the last job i did on this was cut a thread one and a half inch 18 unf
and that involved using the back gear which is this lever above just undo the pins
that disconnects the interlock so it'll turn the power off to the motor
and i can move it across into gear
now if i just turn the spindle to get the gears to engage there we go it's in back gear and once it's
in back gear if you use it a lot you're supposed to oil the center hole there which puts oil into
the center of the spindle and on the rear of the machine there's another hole where you oil
and that feeds oil along the shaft to the gears at each end of the shaft
now if you put too much oil in the oil will just spray all around on the inside of the case
and can get on the main belt so what i want to do today take the top cover off
which involves undoing four screws remove the plate and have a look at how much oil is inside
i may need to get a piece of cloth just to wipe some of the oil and soak it up
but we'll have a look first
just undo the four screws
plate comes up you can see here look it's already oil but that's telling me straight away
i have too much oil in the top you see i turn the lever to engage the back gear
it does two things the first thing it does it slides his shaft along and engages the gear
with the gear on the other end and at the same time it opens the the drive and disconnects
the two pins that go into the drive holes so it disconnects the drive from the belt
and it connects the gear on the other end of the shaft to the drive
so the power is transmitted from the belt through the gears to the other side of the belt
this is a lever to engage the back gear there you can see one of the gears on a shaft
and on the other end of a shaft is another gear here is the gear on the main shaft
and this is the drive belt going down to the motor so when you turn or move this lever
this moves this gear over inside and brings it in line with the gear on the back shaft
and also at the same time it disconnects this gear from the belt so if i do that
you see the gears moved out and it's disconnected from the belt
this one on this side has engaged with the gear
here and the gear that's moved across is engaged with the gear on the end here
this side is disconnected and you can see one of the two pins
here so the power comes up to the belt turns this part turns this gear drives this gear
drives that gear and then turns the gear back on the shaft that turns the chuck now this shaft
is not split it's a solid shaft and all that happens is the belt will move freely on the shaft
and because it can move freely on the shaft obviously it needs
some lubrication and that's why it has a lubricating hole in the middle if i turn
it back into gear turn it around you can see there's a lubricating hole there which normally
you can't get that from the top you have to feed it through the hole in the front so you can't see
how much oil you're putting in any excess oil finds its way out inside and splashes around
so what i'll do now is engage that i'll start it up and we'll see if there's any excess oil
i think you just want to wipe over with the paper towel to absorb any oil i just check that the
the belt has not got any oil on it
another problem you have with these Boxfords if you pump too much grease into the bearings
it just comes out on the inside and it gets thrown everywhere
now i check this about once a year so it's not something you have to do
every week or every month just be careful when you're oiling and greasing the bearings
and the spindle see what i mean about the grease
i've cleaned enough dirt and grease out of there for now
now just give it a spray with some break and clutch cleaner
which should remove most of the grease and oil and wipe it over and it's finished
now i'll replace the top cover and we'll have a look at the drive belts in the cabinet
on this shaft you have the end of the main drive belt here in the middle
and to the left you have five v-pulleys
with your belt for your speed
and at the bottom a matching set of five v pulleys and it goes across to another belt
which then goes down to the motor you can lift by pulling this lever you disconnect the belt
on the left so i can take this belt off the bottom pulley i can check the belt face for oil or grease
there's nothing on there and you can check the the v's in the pulleys for any wear that one's okay
put that back if you're leaving your lathe for some time without being used i would recommend
that you slacken the tension off with this lever just so the belt is not under tension
it all looks all right down there you can just see on the back of the cabinet the shiny film
of oil which obviously has come from the top so i'll get a bit more paper wipe that off
and i think that would be okay if you've lost track of where the belts go see if i can draw
one in there's a belt from the top this is a chuck it's the headstock and it comes down there
that goes just to a shaft with the pulleys on the end
the v pulleys for the different speeds then there's another belt that comes down
on this side depending on what pulley you've selected for the speed
that goes to another shaft and on that shaft
on this end there's another belt that goes down to the motor
and that's so the pulley system works and the belt system
on the Boxford with the motor in the cabinet underneath
okay that's it for today hope that was useful
hope you enjoyed it and we'll see you next time on Enots engineering