Colchester Triumph 7 1/2″ automatic feed problems

[Pieter VanheuleParticipant @pietervanheule76247]

Hello guys,
I bought myselve a lathe last month.
It is a colchester triumph 7 1/2" lathe

I am having problems with the automatic feed of the carriage.
I opened the gearbox from the automatic gears and found out that the axle where the idler sprocket who chooses the gears is tensioning into the tube where in witch the bearing is mounted.
This caused the main small driving gear to fail.

this is why I want to disassemble the whole axle shaft bearing thing with the idler sprocket.
I am having problems to figure out how the red idler sprocket assembly (red box) is bonded onto the tube in witch the axle runs ( green box)
Does anyone have any experience in disassembling this part of the lathe ?

Thanks
Greetings

[Pieter VanheuleParticipant @pietervanheule76247]

[Howard LewisParticipant @howardlewis46836]

Don't know the lathe,

But would probably start by driving out the pin that retains the small gear to the shaft (It may be a taper pin, so check both sides!) Then remove the shaft and the gear. This may uncover how the gear carrier is fixed to the selector shaft.

Annoyingly, every time that I look at the enlarged picture, what has been typed disappears!

So, if inspiration strikes, may have to post again

Howard

[mechman48Participant @mechman48]

I would guess it's a taper pin holding it on; as per Howard's comment.

George.

[Howard LewisParticipant @howardlewis46836]

Looking again, I may well have got things the wrong way round!

Having driven out the pin holding the gear, and removed it and it's shaft, the Selector shaft may be a tube that slides over the long pinion with which the "just removed" gear meshes. It looks as if there is an Allen capscrew clamping the handle to the selector sleeve. This implies that the long pinion will need to be removed, from inside the sleeve. Which probably brings us back to square one!

Will look again in the hope of spotting something.

Howard.

[not done it yetParticipant @notdoneityet]

Howard,

Highlight your text, copy it and then change page. If/when you lose it you can paste back your previous keying, on returning to the reply.

[Howard LewisParticipant @howardlewis46836]

Looking at the picture, a few thoughts on how the entire mechanism may take the drive from the Input to the Leadscrew and the Power Feed shaft.

The two levers in the Left section of the box provide high or low ratio drives into the long pinion in the Norton box proper.

The upper lever on the Right side of the box, appears to engage the Leadscrew by moving to the Left, to engage the dog clutch with the gear which is in permanent mesh with the gear cluster on the central shaft. Moving to the Right seems to engage that gear with the gear on the end of the central shaft, to drive the Power Feed shaft.

But what drives this gear ? Or have I got things completely the wrong way round, and moving this gear to the Right engages it with the gear cluster, and by what might be an internal dog clutch,to the Leadscrew? Can't see the fitting at the Right hand side, around the Leadscrew, clearly enough, to be sure.

Drive from the lower Left hand shaft, passes to the long pinion, (which may be integral with it) The gear on the Selector sleeve is merely an Idler between the long pinion and the gear cluster. This gives the various ratios between Input and either the Leadscrew, for different pitches, or the Power Feed shaft for different feed rates.

The central shaft in the Left had section of the box will not be connected to the Central shaft in the Right hand section of the box, carrying the gear cluster.

Hope that all these thoughts are not stating the painfully obvious, but may provide some ideas on how to take things apart to the damaged components.

Howard

[Howard LewisParticipant @howardlewis46836]

NDY

Thanks! Never thought of that have been running two tabs, one for the words and the other so that the pictures can be seen

Howard

[Howard LewisParticipant @howardlewis46836]

Pieter,

Did you fix it?

If so, How?

Two months later, we are all waiting to hear what has happened.

Howard

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