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

The Craftmans Shop > New from Old

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Pete W.:
Hi there, Andrew,

Have you got room to fit one of those rotating glass disk gizmos (I think it's called a 'Kent Screen') on the inside of your door?

awemawson:
Pete, I've actually got one in a box somewhere, I must dig it out and see if there is room :thumbup:

PekkaNF:
Good work.

--- Quote from: awemawson on January 28, 2019, 06:58:23 AM ---...
I decided to use my Tesa electronic DTI, as it has the advantage of being able to be set to increasing sensitivity as the process proceeds, and also to have a long enough cable to be positioned at the operators console from where I'm moving the X slide.
.....

--- End quote ---

That is very usefull looking indicator, small to install and display is a separate unit. I have been eyballing lazilily some LVDTs and diplays, but the (mitutoyo) price has been a deterrent.

Tried to google canditates, but I'm failing with proper search words.

awemawson:
Yes Pekka it's a real boon having it. Picked it up on eBay many years ago. It uses a non standard battery, so I made up a paxolin block with holes to take AAA Duracells which solved the problem

I have a mains operated version that's a bit big and clunky but takes the same pin out sensors, and also takes two of them for high and low limits in a production set up, lighting red and green lights for 'go' and 'no go' !

. . .I've only got pictures of it's internals when I got it and mended it ! It uses PROPER electronics not this modern stuff :lol:

awemawson:
So Pete-W I dug out the spinning VisiPort, but unfortunately it's not going to be an easy fit. Like all these CNC machine sliding doors, there is a wiper seal stopping blood and guts getting driven down it's side, and were the VisiPort to be glued to the door, the seal would wipe it off again - sad but true.

Still on a brighter note I've bottomed out why the machine just stopped and refused to do anything the other day. Absolutely NOTHING to do with the relays that I'd suspected. It was the key switch on the Operators Panel :clap:

It turns out that the slightest touch on it, and it operates. Now this key is intended to stop people fiddling, so inhibits many functions. Measuring the contacts, even when 'closed' I'm getting 600 milliohms which for a gold plated contact is far too high. I think some of the Lithium corrosive gasses got into it from the original problem.

EBay has sourced me a very nice looking replacement, allegedly Swiss made so hopefully reasonable quality, brand new for £3.20 :thumbup:

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