The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)

The Craftmans Shop > New from Old

<< < (175/260) > >>

philf:

--- Quote from: awemawson on December 16, 2019, 11:35:53 AM ---........ take the tin opener to it - 'open the box' as Hughie Green used to say......

--- End quote ---

I must be in a pedantic mood tonight Andrew but I'm sure that was from Take Your Pick which was hosted by Michael Miles!

RodW:
With oxidised connectors, a friend of mine with an electronics background say to grab some Inox lubricant which is electrically safe, spray the contacts and insert a few times to remove oxidisation before reassembly. This fixed a 30+ year old electric forklift for me that the factory technician had absolutely no clue how to fix.... and a few other things. so I am a fan now too!

awemawson:
Yes switch cleaner is also good as an anti-oxidant

As for Hughie Green or Michael Mile Phil, I don't remember - just what my grandparents told me :lol:

awemawson:
Well the Vogel lubrication pump tripped me up again (look back up thread three posts for the previous problem)

I've not used the lathe for quite a while (been busy with Induction Furnaces!), but about ten days ago I thought that I should fire it up to show it that it's still loved. Trouble is, I couldn't get it to complete the initialisation routine (traverse over X & Z reference sensors, initialise the turret controller and tell it which tool station is currently selected,)

Now to be honest I've been putting off looking at it - didn't fancy a long diagnostic process again! But today was too hot to do anything else so I got stuck in.

Tried several times, usually I could jog both axis, and drive them to reference positions, then the controller would lock up. Nothing seemed to make sense until, poking through my decoding of the PLC code and correlating values with what I could read in internal registers I realised that I had a lubrication fault - there was the bit set in a register winking at me.

The system is very simple. At power on, the Vogel pumps for a few seconds, then goes into idle for a predetermined time, before again it pumps oil. There is a pressure switch monitored by the Vogel electronics that if it hasn't come up to pressure fast enough after pumping closes a signal contact registering the fault with the main Siemens CNC control.

In normal use the controller flags the error in text on the screen, but at start up this is blanked out by the words 'Initialise Turret' - yes OK I'm tying to!

No lube, no movement allowed says the Siemens CNC control and there you are locked up :bang:

Now a few presses of the manual operation button on the Vogel and again the fault has gone away - last time it took 8 months to come back but it looks like I need to pull it all apart again and at least check the pressure switch (internal, and inside the oil reservoir!)

(Pictures from last episode!)

RodW:
I don't know anything about oil pumps but it sounds to me like due to sitting so long, its either lost its prime and it needs those manual pumps to prime it or that the pump has gummed up from sitting and those few pumps clear it out.

Good you worked it out.

Navigation

 Message Index

Go to full version