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91
Project Logs / Re: Building a New Lathe
« Last post by Fergus OMore on July 15, 2018, 07:59:58 AM »
:beer: ;-)

I thought that I'd written about this - before my world was thrown topsy turvy.

Ah well, it's an absorbing post- thanks

Norm
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Project Logs / Re: Building a New Lathe
« Last post by Neubert1975 on July 15, 2018, 07:24:57 AM »
 :beer: ;-)
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Project Logs / Re: DIY tablet computer, maybe.
« Last post by awemawson on July 15, 2018, 06:01:55 AM »


I think it's generally seen as... uncouth or something to talk about price and money. But if someone says somethings cheap or expensive it's really a relative thing and it's hard to tell how they personally value things. For me 193 is definitely in the 'yowza!' territory.

Actual prices are probably important so people can see how much it's worth the idea of making your own mains power only tablet computer with a high chance of failure against just buying one. Plus calling it a tablet seems like a stretch if it's mains only. It's closer to an all-in-one PC really.

Simon, price or cost is often highly relevant in these matters. If you're giving someone a present and discuss it's price, or bragging about your costly new car, then yes that's uncouth, but letting people know what is a realistic price in an engineering discussion I believe is absolutely fine
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on July 15, 2018, 05:50:35 AM »
 :clap: :clap: Well guess what I've found  :clap: :clap:

The only places left were the hydraulic cabinets for the tailstock and chuck - and on their control cards we have - CR10 and CR20 - hoo blooming ray  :ddb:

The odd thing is that they both have tell tail green LEDs which are glowing away merrily when the power in on, but at least now I have a further avenue of investigation to follow  :thumbup:

. . have to stop now as entertaining for lunch and need to be presentable  :scratch:
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Project Logs / Re: DIY tablet computer, maybe.
« Last post by PekkaNF on July 15, 2018, 05:35:41 AM »
I am a huge fan of 3M VHB tape. They make a clear version for glass. I believe it is the the same acrylic adhesive most manufacturers use for bonding windows and windshields for everything from aircraft to cars. It is also extensively used in the construction of the Burj Al Arab hotel in Dubai. Once you stick it on, you can never get it off again.

It is also easier to apply than liquid adhesives.

I bought a roll of Tesa 4965

https://www.tesa.com/en/industry/tesa-4965.html

pretty good, instant results

1. Store it on ziplock, or edges will atract fuss (my daughter stored it with some clothe and it sitill is fine for most uses, but not between two glass/plastic panels.

2. Getting backing off takes a little practice. I leave a little excess outside, surplus backing underside, apply tape, remove the backing on surplus side and cut off the "tail" before joining two panels together.

3. Sticks to everyting and only thing it did not work was sticking a shower handle holder on the tile on the bathroom, it had tilting load and it eventually crept. I have used it on the fixtures to hold material that is drilled, sawed, cut, routed, sanded and it has been nearly perfect. Only on latest ocassion I thinkt that I did remove all of it and it interacted with sprayable alcyd paint (some roughness).

Higbly recommeded instead of glueing.

Pekka
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on July 15, 2018, 05:26:13 AM »
After more 'going round the houses' with a meter and wire sniffer (*) I've eventually deduced that those two small relays are nothing to do with monitoring the 24 volt power supply  :bang:

The one on the left is monitoring the overload trip circuits for various motors, and the one on the right is NC-READY ! - relays suitably labelled. But the controller is still reporting a 24 volt psu problem and I have no idea how it is monitoring it  :scratch: The relays shown on the diagram as CR10 and CR20 are nowhere to be found and I did eventually find the correct bit of the diagram showing the Overload and NC Ready relays.

Oh well maybe they will turn up somewhere else but I thought that I'd been everywhere by now in the mammoth structure of a lathe  !

(* Tempo 200EP Inductive wire tracer intended for telecomms use)
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Project Logs / Re: Building a New Lathe
« Last post by seadog on July 15, 2018, 05:09:00 AM »
That would be Mazak, Fergus.
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Project Logs / Re: Building a New Lathe
« Last post by Fergus OMore on July 15, 2018, 04:11:46 AM »
Simon

'Chinese metal' appears regularly in such things as vehicle carburetors and in model engineering, the feed nuts on Myfords are a zinc alloy.

One fault is that it does corrode until after a certain point it will be nothing more than white fluff! Chemically, it is somewhat worse than cheap brass.

However, it is easy to cast and I have rather a nice Unimat clone lathe made from -- lots of it.

Probably 'metal' for typesetting is something similar.

I hope that I haven't stolen the original post-- but Simon did ask

Norman
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Project Logs / Re: Building a New Lathe
« Last post by S. Heslop on July 14, 2018, 10:42:38 PM »
That's interesting to read. I've heard of it before in the context of bearings and also in a few older lathes switching over to zamak parts, implied as a cost cutting measure. So I was thinking of it in my head as the classic mystery pot metal and not really a useful structural material compared to aluminium. It's low melting point definitely makes it worth keeping note of.
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by vtsteam on July 14, 2018, 10:09:15 PM »
Finally!

Amazing how much reverse engineering you have to do, even with manuals for these things. You wonder, is it a faulty component, or is the manual accurate, or are both the problem? Then if you do something and get the green light it's like Christmas! Except, on to the next.... anyway:  :clap: :thumbup: :beer:
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