Hello welcome to Enots engineering I'm Alan today we'll be looking at the boxford
lathe I've had some problems which the chuck slipping on the on the belt
so what we'll do is have a look at the v-belt that's in there see what
conditions it's in and have a look at how we replace it okay on the Boxford
lathe you've got this plate I've undone the screws take the cover off and inside
theres the gears and the top of the pulley for the belt this is the lever that engages
the back gear you can see here a small ball bearing that is actually that the
ball bearing that pushes down when you oil the top the oil can has to push that
ball bearing down make a seal around the aperture and pump oil inside there.
Now you have to do that through the hole on the front of the machine So if your oil can
doesn't seal you're actually pumping oil onto the top that pulley here and this
next to it is your drive belt so eventually your drive belt. so eventually
the drive belt gets saturated in oil The oils thrown all over the inside here and this makes the drive
belt slip. So the first job I want to do today is giving it a good clean-out and get
rid of as much oil as I can from the area I've use this cleaner and some
rag to clean out all the oil from the belt area
I split the links on the belt as you can see on this the belt each link is held
together with a type of rivet you can see from touching it the dirt from
the oil on this it's saturated in oil and it started to de laminate.
The other thing as well is that when the belts in the pulley the top of the belt is level
with the pulley so it may be that the bottom of the belt is bottoming on the
pulley rather than the sides of the pulley that belt is 45 years old at
least it was the original Belt this is the shaft with the back gear on there
The gear on this one which is connected to your head and Chuck and in this gear
are some holes this is the pulley you can see any better it's the pulley
here where the belt goes and what we do when we change back gear it just slides
this gear along so that this one engages with that and it disconnects
this gear from the drive. you might be able to see. see it moving backwards and
backwards or forwards this gear here is moving as well and in this gear let me move the camera
a bit better position in this gear there's some holes and on this
shaft there are some pins and when the gear is in position the pins the pin
there will go into the hole in the gear
Thats back gear engaged and that's without the back gear direct drive you can see the
conditions of the pulley get the light in this is the the V for the belt
and it looks as if the pulley has been just touching the bottom of the V so it
would mean even if I took some links out to tighten it up further once its touching the
bottom it loses traction on the side of the V let's check the bottom pulley
now you can see the bottom pulley which I've cleaned and the pulleys on the left
but to select the speed if you follow that down in the bottom here
you've got the right hand pulley is the drive for the motor and the left and pulley
gives you different speeds This is the new belt it's a different design its got t-connectors
on rather than a round rivet head so you just turn the Tee connector
and it'll go through the hole easier it's also not leather some sort of
plastic material reinforced so I'm hoping that the quieter and you can see
the old one to the new one the new one looks a little bit wider even though it's
supposed to be the same size that just shows how much the old one has been
reducing size now let's see how it fits The new belt the links go into the
Belt like that
you bend the belt push the link through once its in twist it round and its
locked so it seems easier to undo and easier
hopefully easy to fit now I've taken the back cover off
give me an easier access to the hole you can see the hole at the bottom there in
the lathe tray it's got the surround round to stop any suds getting down so
the belt has to go through that slot Up through the head hear over the pulley
down under into the cabinet and around the bottom pulley
As soon as you poke the belt down it's curving around there's a small hole here
by the bed of a lathe and there's another hole you have to get the belt
through you its in the base of the tray you have to poke the belt through two
holes to get down to the pulley at the bottom so what I've done is thread through
this piece of metal which I use for threading wires and things so now I'll
tape the belt onto the end of that with some masking tape and pull it through
Right after spending some time and messing about trying to feed it through I've actually got it fitted
I know it's loose but I just want
to run it to get it to bed its self in You can tell its loose because I can hold the chuck still
with the motor still running
I will. leave it for 5 minuets
Let that settle in then I will take a link out
if you compare this belt with the other one you can see that this new belt
stands a lot higher in the pulley and please note the direction of the belt
links the narrow end is facing the direction of travel
I've taken another link out, running it I just wanted to bed in really I can't
stop that chuck now on the same speed when before I could so just
amateur of leaving it for ten minutes too bed in and slowly move the belts on to
the higher speed because with the old belt in cold weather like today the temperature in here is
8 degrees and I couldn't put this machine in full speed you can hear
the motor grumbling the belt slipping we have to get the bearings warm.
at the moment it's halfway along the belt so it's running out 540 so its quieter
than the last one the last belt I haven't got all the bits flapping around
so I will put all the guards back on and see how it goes
This is three links I took out seems to have settled in ok Its been running for half an hour
This is the old belt you see this it's soaked in oil
Its started to delaminate But it has lasted 46 years
oh thanks for watching I hope you've enjoyed and we'll see you next time on
Enots engineer