Hello welcome to Enots engineering I'm Alan in today's video I'll be replacing
the bearings on the bottom and the top pulley spindles for the lathe drive
system this is one of the bearings I'll show you how to replace them in this
video. So this is the bottom of the boxford of the lathe. Where motor is and I've got a
problem with something rattling I can't find out what it is.
The first thing obviously is turn the power off disconnect this tensioning
mechanism.
A nut and bolt on the side and a nut and bolt on that side and the motor units at
the bottom should come out
a lock nut on this side slacken off the bolt.
On this the bolts or underneath the shaft so I can't get the socket on it.
just the motor on its own. Get this cleaned down
now can get at it.
connector box release the sponge from behind it. I can see how they've identified it.
All the wires are white and pink so basically we've got a white and a pink and
a white and pink on the side. On the side they've just stuck some red tape on to
denote that these two go together. Undo it from the cable side
That should pull the wires through and this I've clean the motor down. I just sprayed
it with some degreaser and wiped it over this is a electric motor it's a
Compton Parkinson motor AC motor 220 volts to 240 single-phase 0.75
horsepower and I think it does 1425 revs per minute looking at it I can't say
anything wrong with it works ok so I'm going to do on this is clean it up a bit
take the cover off and check the bearings I've got grease in but as you can see
from that it's revolving freely there's nothing
catching there's no noise so I'll just checked that its got grease in. And also
I'll check that this pulleys tight on that that's tight.
that's tight doesn't need to be tightened and I can't feel
any play in it I'm quite happy with that. motor. Just turn it round and take the back
cover off here and see what the what we have.
The grease look all right as well.
Just take that out and repack it.
Re packed the grease put the cover back on. So that ends OK.
rotating freely so don't think there anything wrong with the motor. So I'll put the motor back on the
floor and I'll get the carriage that it fits on.
The electric motor drives the belt which turns this side and this is a
five different speeds you can they have on this side so it's another belt that
goes on here it goes up to a spindle that goes across the top.
The only thing I've noticed is that this pulley on this end
it's got play in this pulley on this end. Let me take the shaft off the base plate
now I've notice there is grease that's gone hard on the face here clear the grease off
here clean this off and bolt that back to the motor.
I've taken off the pulley
on the motor side taken the woodruff key out of the shaft. Which goes in there
I've cleaned all this down spin the bearing it sounds as if there's no grease in the bearing.
I think what's happened is the grease has escaped somehow that sounds
like new bearings need on that. You can hear its a bit rought.
I've drilled the grub screw out on this end because trying to undo it it has bending the allen key for some
reason it was jammed in. Okay lets bring you up to date with what's happened.
I've started to reassemble the motor and the holders I've bolted the frame to the top of
the motor
cleaned it down the bearings have arrived I'vel clean the original holders these are KSM
bearings I thought they'd be some sort of cheap replacement that actually made
in Japan so the quality should be okay
Lets check that they are the same. The first job is just tap them into the housings
okay I'll press the first bearing into the housing the way I did that was.
You put the bearing into the housing square
Put it into the Vice with jaw protectors and push it in till it's come
to the front and using a big socket which is just smaller than the OD of the bearing
use that to hold it between the vise and push it in all the way home.
Just file the flat on this end a bit further along the grub screw was going on to the edge of the flat
rather than on the flat itself. you can see now I've just taking the flat back about a quarter
of an inch that's where that hole was that's where the pulley is going to
clamp on so I can use a hole for the grub screw to locating and I know that
pulleys in exactly the same position as it was before. Now found piece a tube it
just fits over the bearing
the next I,ve done is put the Woodruff key and I did that just by
putting some voice to your protectors on and just using the voice to squash it
back into the slot. So all that remains now is to put pulley on I'm just tapping
the pulley on I've got a block of wood on the end of a pulley holding the shaft
in the voice with some jaw protectors and just tap we've pushed the
pulley on until it lines up see in the bottom of the hole where the drill went
through just spotted the flat
I've cleaned out the area wood down the oil and
grease off the sides clean the floor so it's ready to go back in
Now while I've got this empty I've decided to replace the bearings in the
top shaft all I need to do here is undo the four bolts for the bearing holders
slide the belts off and I can take the bearing holders off the end of the shaft
replace the bearings in the same way as the did on the main shaft.
The bearings have arrived for the top shaf t.
Part number R 1 2 Z Z KSM Japanese bearings again.
I've just got to press these into the holders place them onto
the shaft and bolt the shaft back onto the machine I've also got a new drive belt
because I thought the other belt was a bit stiff should be enough adjustment on
the length to take up an inch or two on the diameter but that was the nearest
size I could get to the existing one that I had. I've use d the socket again
which goes on the outside of the bearing to press it home now I've turned it around
in the vice. I've got some lead jaw protectors on the vice to stop it
damaging the shaft.
so both bearings are up against the face
that's ready now to go back into the lathe. When putting the shaft back in
The first job is to put the main drive belt from the headstock on to the center
pulley and put the speed change belt on to the pulley before you bolt the
spindle down. if you slide the spindle in under the bracket that just puts a
little bit of tension on the center belt so I'll need to do now is put the four
nuts and bolts back in and then align the belt by pushing it backwards or
forwards to get it back in similar position to it was before. I put the
bolts in loosely you can't move it left or right so that lines up with the
brackets but you can push it backwards and forwards and all I'm doing is
bringing it forward on each bearing housing so I know that it's square and
also checked that the belt, your head stock belt is clear where it goes through
the lathe base and there's a slot so you want to make sure that the belts not
running up against the the lathe cabinet that's clear so now all I've gotta do is
tighten the four bolts up and put the pulley on the drive so once you've put
put your assembly back together just recheck the belts are still in line now
all override these safety switch and see how it runs
let's change it up
full speed this belts not worn in yet drop it down to the Midway so you've
hardly got any tension on there at all.
Well hope you found that interesting and if you did why not give me the thumbs up
or subscribe and we'll see you next time on a Enots engineering