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21
The Design Shop / Re: DRO for Warco Major mill
« Last post by PekkaNF on January 19, 2019, 06:57:55 PM »
Now the interesting question. Which way should axis indication increase?

CNC easy, two views, same result...




[/quote]

BUT this is a manual machine

1: When I turn Y-axis wheel clockwise table will move away and numers on micrometer will increase.....it would be elegant if the numbers on DRO would increase as well.

2: Looks like it is rather popular to zero origo on fixed jaw of the vice. Obivious benefits.

Any takes?

Pekka
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The Design Shop / Re: DRO for Warco Major mill
« Last post by PekkaNF on January 19, 2019, 05:38:59 PM »
Today I had few extra hours and plan was max. results with minimal effort.

I could not locate thick enenough aluminium for support, I mostly used 30x30 mm 2 mm thick L-profile.

Mechanically it appears fine, but I haven't tested it yet electrically.

Magnetic tape is now 2 mm off the sensor. Plan is to file 3 mm bolt holes oval just enough to bring the tape near the sensor but avoid physical contact.

Still two separate items left: X-axis and configutation.
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New from Old / Re: Racal RA17 re-born : A trip down Memory Lane
« Last post by Pete. on January 19, 2019, 02:30:08 PM »
I shipped an unused vintage 1940's tilley floodlamp to Australia without it getting damaged. The buyer stated that he didn't care how much it cost him so long as it arrived un-damaged. We bought a double-thickness cardboard box and a whole roll of bubble wrap. Of course that thing only weighed about 8-10kg not 97, but the concept is the same. Sturdy box and loads of bubble wrap to insulate it then parcel-strap it to a mini-pallet so it'll always remain right side up.
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Metal Stuff / Re: Sinker EDM question
« Last post by Alphawolf45 on January 19, 2019, 02:04:40 PM »
 Ohh my I laugh so much, Tom you are a comedium.  :mmr: :mmr:
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Metal Stuff / Re: Sinker EDM question
« Last post by tom osselton on January 19, 2019, 01:56:36 PM »
Had to buy your own machines! WTF!
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New from Old / Re: Racal RA17 re-born : A trip down Memory Lane
« Last post by awemawson on January 19, 2019, 12:59:21 PM »
So the next thing to work out is how to transport this megalith (97 lbs not including the 'desk mount' case!) the entire length of the UK while retaining some confidence that it won't be smashed to smithereens  :bugeye:

Meanwhile have a fragment of the circuit showing a few of the pesky filters that need aligning :
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New from Old / Re: Racal RA17 re-born : A trip down Memory Lane
« Last post by hermetic on January 19, 2019, 12:56:12 PM »
I used to fiddle with communications recievers when I were a lad, that looks like a beauty! I lived at the village shop in Langtoft, East Yorks, and well remember our lovely paper delivery lady, ariving to sort the papers on the dining table, where I was tinkering with a bare chassis, I casually wander over and picked it up, having forgotten it was still on.....................How she laughed!! I must have looked like Michael Jackson dong the dance for "Thriller" It bloody hurt!
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New from Old / Racal RA17 re-born : A trip down Memory Lane
« Last post by awemawson on January 19, 2019, 12:08:28 PM »
Years back I had a great interest in Communication Receivers - in fact I had quite a collection of what other followers of electronics would disparagingly call 'boat anchors'.

Before re-housing the workshop and moving here (11 years ago) I reluctantly disposed of most of them, but I could not bare to get rid of my Racal RA17. This receiver, made in 1957, is iconic. At the time it was probably the most stable communications receiver and was priced accordingly. Used in huge numbers by the armed services and many 'listening posts' it played a large part in our cold war defence 'snooping' on the Eastern Block.

Why was it so stable. Well it used the 'Wadley Loop' designed by Trevor Wadley (a South African) at the invitation of Racal, and uniquely used a single crystal generating many harmonics, to control two local oscillators whose drift would self cancel. (a VERY simplified description)

I don't remember when or even where I got mine, but I have found traces on the Internet of me asking questions back in 2002, so it was before then !

Now it's been packed up for those 11 years. The capacitors and resistors in these sets are well known not to age well, and I do recall dimly from before I packed it up that it would benefit from some TLC - leaky capacitors and resistors changing value all contribute to reducing sensitivity and selectivity.

I've decided that at last I must get this unit back into commission, but sadly I no longer have the RF test gear that I did, and this set has some very complex filter networks (100 khz, 37.5 & 40 Mhz) that need sweep generators to set to the accuracy demanded.

So, biting the bullet, I'm planning  to 'out source' the work to one of the very few people able to do it. This will include replacing all electrolytic capacitors, all paper capacitors above 4.7 nF, replacing all carbon resistors, and re-aligning the filter units.

It's had a few 'modifications' where non original sockets have been substituted for more common ones, and those mods will probably be reversed if possible.

To whet your appetite have a few pictures taken today when I pulled it out of the eaves storage where it's been all these years:

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Metal Stuff / Re: Sinker EDM question
« Last post by Alphawolf45 on January 19, 2019, 06:52:57 AM »
 I am not too bright as I apparently cant spell.

    Thanks guys You have answered my question good'nuff. I will presume that .001 per minute at 10 amps is within the range that is considered normal...And terrible slow :palm:

  As for the job I applied for and didn't get. I didn't want anything except the chance to play with a newer cnc mill Than I have.. Consider that we have to buy our own machines and repair them and continually feed them new endmills and drills and inserts.. It would be nice for a while to run somebody elses machine and not be responsible for the costs of running it.
 
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Project Logs / Re: PCB UV exposure box
« Last post by AdeV on January 19, 2019, 04:55:42 AM »
Well I stood there pushing the bell for hours hoping for a brew, but gave up and found a cafe  :doh:

I was probably out  :lol: making really slow progress on a doorbell...  :poke:
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