Belt and Bearing change?

[murphy86]

Hello all.

This is my first post and it’s a technical one!

I’m using a Harrison Graduate and the head stock is heating up considerably.

The lathe had been stood for around 20 years before I started using it I don’t think the bearing is corroded but the grease may have set solid and is causing the friction.

If anyone has any kind of detailed instruction on how to get the spindle, bearings and all the other gubbins out of the lathe it would be much appreciated.

Thanks
Richard.

 

[Turn It In]

Hi Richard,
The process is as follows:-
Release drive belts by lifting the motor.
With the top lid on the column open you will see two grease cups or possibly nipples, one on each bearing housing and next to these you will see a hole which you may need to clean out.
You will need imperial allen keys. I cant say what size you require but you are going to slack off a grub screw at each side.
These hold spacers which run against the bearings.
Now look at the pulley and you will locate another grub screw slack off and remove. Sometimes there are two grub screws in these locations the first to lock the one below in place and stop it coming loose, so check to see.
The shaft comes out over the bed so it has a large flange that runs against the centre of the bearing, then on the inboard side of the bearing is the spacer. Next the pulley block should be loose on the shaft now and moving to the outboard side of the head there will be a spacer the bearing and a loose flange on the outside of the bearing.

You will need to free all these section to get the spindle moving and remove each piece and lay them out on the bench in order to aid reassembly.
The two bearings can then be pressed out of the head using threaded draw bars plates etc what ever you have available.
They are standard of the shelf items from most bearing suppliers and at the same time you can buy new drive belts usually from the bearing company. Buy two and hang a spare over one of the bearing housings so that next time a belt needs changing you only have to cut the old one off and fit the new one.

Now as in all good car manuals refitting is the reverse procedure.
The bearing will probably be open ones so fill them with plenty of LM grease and don't forget to clean all part thoroughly before reassembly.

I hope this will help you as it not to difficult once you get started, being industrial machines they are meant to be serviced easily.

Regards,
Ian

 

[flh801978]

Basically give the bearings a good clean before you start and you should see some imperial grub screws holding a collar on at the outboard end remove these ( sometimes 2 screws...one on top of the other).

Then remove grub screws in headstock casting holding bearing sleeves in ...one in each end. but only remove inboard side for now

remove screw holding pulley on..
then with a mallet knock the spindle from the outboard end towards the inboard end and the spindle should slide out...carefull of the pulley as you go.

then knock out outboard bearing after removing screw.

Wash the bearings in white spirit they WILL feel rough... regrease and then see what they feel like.. new bearings are only £40-50 at a bearing supplier.

reasembly is as reverse remember belt !!!

Ian

 

[flh801978]

turn it in beat me to it by seconds...

 

[murphy86]

Cheers guys.

Thanks for all the help. Its worked a treat and the lathe is in pieces ready to be cleaned and regreased.

I also emailed Lee Cooper from LRE Machinery and equipment Co.

http://www.woodturninglathes.co.uk/

He also sent me full instructions and pdf. diagrams. Just a heads up if anyone has similar problems Graduate related.