Reconditioning a Relmac lathe

[ptjw7uk]

My idea was even simpler , just reduce the end that goes through the tail stock to fit an electric drill.
If I was doing it I would also only do one bearing at a time and use the other to hold a bearing block to hold the shaft doing the boring.
Only real problem would be getting the bar straight and long enough but at least you could push the tail stock near to the head.

peter

[irving2008]

Peter,

Yes I understood your thining, but I would prefer to do them at the same time (not bore them simultaneously, but in one session without tearing the fixture down). Since I want to pour both bearings at the same time. Your approach would require two bearing blocks, to fit the unbored bearing as well as the bored one. Unlike kingpins they will be significantly different sizes - the unbored one approx 1" dia, bored it will be 1.25" +0.002/-0.000.

I am planning to use 20mm dia round rail as rhis is cheap to get and guaranted straight. Although it is hardened so I will need to gring some surface off bore milling some flats on it and drilling 3/4 way through for a 6mm cutter and the remainder of the hole 3mm tapped M3 for a pusher screw. There will also be a 3mm locking screw at right angles. The end thread will be used to push the cutter out and so accurately set the boring size (1 turn of screw = 0.5mm)

[ptjw7uk]

Just seen this on the web http://bbs.homeshopmachinist.net/sho...t=39441&page=2
Doing just what you want todo
Peter

[irving2008]

Thats exactly it, except i dont have the luxury of moving the headstock, but the idea is the same...

I have three tailstocks, so i was thinking of removing the centres from two of them and fitting then with oilite inserts to act as bearings for the boring bar... this wil allow the bar to turn as well as be fed

I solved the problem of moving the motor by using a snake drive off my electric drill which has a low speed control

Now... how to regrind the vertical bearing face of the bed....

[BillTodd]

Chris: Sorry missed your post (email notification not working here) and Sorry but I can't find a picture ATM (I know I have one somewhere)

Onecut: My one is missing a couple of bits and is in need of a service, so I may be quizzing you about them later :)

[onecut]

bill.dont know if l will be of any help to you but you never know obviously buma,s is no longer there the old man died a true engineer passing on to his son without being rude he knew absolutely zero about engineering quickly sold place first chance he got to a large well known supermarket chain and a large superstore is now there so spare parts will be difficult to get but at least you have an edge, me l know the then works manager was allowed to take the blueprints of buma borer and he does or did supply spares and l have his phone number at worste he might give you a drawing of the part you are after-onecut