Denford Software & Machines

After a very successfull morning producing aluminium parts from 22mm dia bar, disaster stuck in the afternoon. At the part off stage, a loud bang, machine stopped due to alarm and parted of bit found broken in the suds tray.

It may well have been due to a part off tip failure.

Anyway, sorted the mess, run machine and it was found that the turret is now about 2mm too high on the axis, almost like the foul up has raised the centre line of the turret tool position.

How does the turret readjust to get it back on the centre line of the chuck?
Barrifaldi 80 turret.
Thanks
Bob

Something could have twisted - the headstock or the turret body, although I think that both would be pinned.

Anyway, I'd start with a test bar and check the run out/taper first.

btw, which control is it ?

Cyclone B, Fanuc OT control. Barrifaldi 6 station turret.

I think my first post confused the issue. I mean't to say the tool carousel mounted to the turret, is where the problem is.

I think what had happened, is the turret had moved on its mounting to the Barrifaldi. To clarify this, a centre drill was "on centre" with the chuck centre line. After the foul up, it was effectively 2mm high of the chuck centre line, (Clocked) giving the impression that the turret carousel has been knocked and made it rotate a degree or so.

How does the tool carousel fix to the Barrifaldi? If its only on a taper, it could of moved. If its splined or pinned, then I have to look deeper.

I'll try the old fashioned way of repair, based on how it moved in the first place, Thump it the opposite direction !!!!
Bob

The tool holder is screwed onto the turret disc with 6 bolts and pinned twice, so it seems unlikely to have been knocked round.
Is the drill off centre in X and 'Y' ?
If its only shifted up in the X axis, it could be that the X drive belt slipped so the machine is homing out in a different position ?

Yes
It is the X axis alignment. If you imagine a line along the axis of X to be 2mm higher than an imaginary line of chuck centre line along x axis.

I cant see how it could have jumped. I get the impression the Bariffuldi carousel locates on a multi toothed ring gear arrangement when its locked in position after indexing. Having said that though, it does give the impression that is exactly what has happened, it locks down after indexing one tooth up.
Bob

I would think that if the turret was locking up out of position, then your drills would be out in the X and Y (imaginary) axes...you would be able to see this by not being able to drill on centre at any X position

If its only out in X, then I would suspect the home position has altered, or the whole turret has shifted (unlikely?) ...if the X drive belt was not that tight, it could have slipped one or two belt-teeth maybe ?

Hi

I also have this problem with my cyclone. it is out in the y axis so it will need re-alignment. How is this possible. Is there a guide on how to do this or will it require a service Engineer to fix?

How is this possible.

It depends on the type of turret...
It will be quite easy for certain types to lock up slightly out of mesh meaning the boring holder centre is not in-line with the centre of the chuck.
Problems could be caused by a turret switch failing or coming loose. It could also be down to mechanical wear or damage

You need to find out more about the type of turret and how it works, then we can make educated guesses as to why it's out of position.

Its a Baruffaldi TOE 80 model.

I've uploaded a maintenance manual for it here:
viewtopic.php?f=4&t=3136

I've taken a look at the manual thanks. Is there an easy way of mechanically adjusting the turret via a setting bar and a clock and turning a few screws. I was hoping it would be this easy but looking through the manual it seems that I will need to adjust proximity switches.

Sorry I can't help you any further, but I've passed it onto Martin who will have more experience of setting these up - anyone else with the knowledge has already left for the weekend.

The 2 dowels Admin mentioned are the key. They are used to align the faceplate then removed.

It may be the pins are still fitted but pulled back. There should be 2 holes next to the 6 cap head screws holding the faceplate. The pins were about 6mm diameter & domed at one end & tapped at the other.
You need to slacken the 6 faceplate screws & tap the dowels in which will realign the turret. Then tighten the screws & pull the dowels out. The dowels are removed to allow a bit of movement without damaging the mechanics.

Hi Martin, thanks for getting back to me.
There are no dowels in the faceplate. Also when I slacken the screws I am unable to twist it even close to being aligned. I belive who ever used this machine before may have had an almighty bang on it to knock it this far out. Is there another way of re-aligning this.

Can you attach a photo of it ?

See pictures

Hi Bob
It may be that you will need to make a couple of dowels.

I can't tell from picture 3 exactly what you mean.
The other way to reset would be to clamp a bar in the spindle the same diameter as the pot. Then slacken the faceplate & the six bolts holding the toolpost down & carfully move the pot over the bar then reclamp. You would then need to clock the faceplate to make sure it is square with the spindle & carfully adjust.

I have tried this method already but the turret is twisted so much it is unable to move round enough. Looking at the first picture with the faceplate removed, is there any method of adjustment there?

Does the toolpost index correctly (& lock ) in all 8 positions without the faceplate on?

yes