The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
I managed to grab a few more minutes and cleaned up the ball screw - it's not perfect but perfectly serviceable. Before actual powered use I'll have another go at it.
Meanwhile Angie the MyHermes courier turned up with the transformer that Pete Rimmer has kindly found for me - goes in a treat. I need to make a mounting plate and then it can be wired up, possibly this afternoon :scratch:
Many thanks Pete
awemawson:
As it happens where I first plonked the transformer is a very handy place. Those bars are tapped M6. So I made an adaptor plate, fixed the transformer and wired it all up.
No mechanical problems but oh boy what a pain wiring it up. This transformer is taking 415 volts single phase from two of the three phases driving the cooling fan for the spindle motor. It's DIN rail terminals are right at the bottom of the cabinet and not big enough to safely take the third 'bootlace ferrule' - three as there is the motor, a suppressor network, and this extra terminal where I'm pinching 415 volts . I ended up removing the boot lace ferrules and soldering the wires before putting them in the DIN terminals - took ages to sort out as immediately behind this bit of the cabinet is the Fanuc Wire Eroder so space is very limited.
All works so a big thank you to Pete for the transformer
awemawson:
One thing leads to another . . . .
Yesterday while rolling on the floor having difficulty getting those wires into DIN terminals, I'd managed to kick the screw lid of my bottle of Hellermann Hellerine Sleeving Oil that you use to slip Hellermann sleeves onto wires. I heard it go, it went skidding across the floor, but no way could I find it :(
So this morning, first task after pig mucking out, find that cap. Well opening the roller shutter door to get more light on the scene there it was, hiding under the spindle motor drive belt guard :thumbup:
. . . . but, putting my head down there i noticed a horribly blocked and apparently inaccessible air input filter on the intake for the spindle motor cooling fan 'snail'. Well no not inaccessible, there's yet another unbolt-able panel allowing me to remove and replace the filter. I'd thought that the airflow was a bit sluggish !
The filter comprises polyester fibre formed into an open felt, trapped between a pair of weld-mesh sheets and it just so happened that I had most of a roll of this stuff left over from when I rebuilt the Fanuc Tapecut Model M Wire EDM Machine (*)
Went in a treat and airflow is improved but frankly not fantastic
(* https://madmodder.net/index.php/topic,10085.0.html )
awemawson:
The Postman (well actually woman - Steve is on holiday!) brought the electronic components for me to be able to continue the repair of the 24 volt Kayser power supply.
Turned out to be two 2N3055's that were leaky Collector > Emitter - would be a nice simple fix, if it were not that of the two I pulled from the batch of ten that I had bought, one was dead short Collector > Emitter :bang: and it would have been EVEN simpler if I'd tested them BEFORE I soldered them in. No big deal but a bit confusing at the time.
Of course that meant that I had to go through the rest of the batch and test them before putting them in the 'stores' drawers.
I was rather surprised that Kayser only used a Mica insulator and no thermal paste between the 2N3055's and the case / heat sink. Being a linear PSU it does develop quite a bit of heat.
I'll leave it on soak test for the rest of the morning, but I will still go ahead and replace the pair of them with a switched mode one that is on order as it will run cooler (hopefully!)
awemawson:
--- Quote from: nrml on July 02, 2018, 04:42:21 PM ---I am surprised that you don't have an industrial grade bore-scope in your box of toys. It would make inspection of these tight spaces much easier and i-phone dangling unnecessary.
To be honest, I don't understand a lot of what you are doing but that doesn't diminish my interest in the slightest. This is truly a worthy sequel to the Traub epic.
--- End quote ---
NRML,
I did at one time try to find a good one, but they all seemed very low resolution, but that was some years ago - I'm open to recommendations if anyone knows of a 'workable' one of reasonable resolution and price
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version