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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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10th Sep 2018, 11:56 am | #1 |
Tetrode
Join Date: Feb 2009
Location: West London, UK.
Posts: 65
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Creed Model 75 RP
Hello Friends, Colleagues, Fellow Engineers and Gifted Persons!
I wonder if you could help. I have recently acquired an example of the above machine. It looks in really good condition both inside and out however, most of the mechanism is so gummed up it appears to have been idle for many decades! Most of the moving parts are seized and I have tried to free it up with WD40 but that doesn't seem to do much although, thankfully, I don't believe it has suffered water damage as there is no rust.. I am wondering if any of you have had this problem on this or any other equipment and may be able to advise which solvent will dissolve the gum! I had thought of immersing the whole machine in a suitable liquid for a couple of weeks but I don't know what to use! I hope you can point me in the right direction! Thanks and regards Chris G4RBR |
10th Sep 2018, 12:04 pm | #2 |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 719
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Re: Creed Model 75 RP
WD40 is a really good Water Dispersant which is what it was designed for. It is not a lubrication nor penetrating oil.
One of the best penetrants is a 50/50 mix of acetone and ATF. After that, neat diesel is worth a try as well as PlusGas if you want commercial products. That having been said, I would be reluctant to use anything until I had some expert advice about the mechanisms. |
10th Sep 2018, 12:08 pm | #3 |
Tetrode
Join Date: Feb 2009
Location: West London, UK.
Posts: 65
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Re: Creed Model 75 RP
Hi Scimitar
Thanks for your reply. I will have a look at your suggestions but I am wary of melting the plastic bits! I'll do a test I think! Regards Chris |
10th Sep 2018, 1:55 pm | #4 |
Guest
Posts: n/a
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Re: Creed Model 75 RP
Take off the electrical bits, motor and 'relay' is all I can think of, then soak in paraffin for a week, a gallon will cover it easily. I have yet to find a plastic that dissolves in paraffin.
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10th Sep 2018, 2:03 pm | #5 |
Octode
Join Date: May 2010
Location: Grantham, Lincolnshire, UK.
Posts: 1,174
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Re: Creed Model 75 RP
They come to pieces quite nicely, like the 7's, but don't under any circumstances touch or undo any screw or fixing painted red.
On my 7's I just use WD40, works fine for me, apparently it is mostly white spirit which is pretty good at ungumming paint brushes. CPC sell Clear Mechanical Oil which I use to re-lubricate my TTY's. |
10th Sep 2018, 4:13 pm | #6 |
Tetrode
Join Date: Feb 2009
Location: West London, UK.
Posts: 65
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Re: Creed Model 75 RP
Thanks Merlin Maxwell and Woodchips.
I just bought a large can of Screwfix penetrating oil and it is slowly working its way in. I marvel at the superb and precision contruction of the machines and I think we lost something wonderful and artistic in this digital age! Will try the paraffin and diesel route first and see what happens! Chris |
10th Sep 2018, 4:52 pm | #7 | |
Guest
Posts: n/a
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Re: Creed Model 75 RP
Quote:
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10th Sep 2018, 5:02 pm | #8 |
Tetrode
Join Date: Feb 2009
Location: West London, UK.
Posts: 65
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Re: Creed Model 75 RP
Haha! Of course you are correct!
I should have said electronic digital! Chris |
10th Sep 2018, 5:06 pm | #9 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
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Re: Creed Model 75 RP
There is some information, including the full manual for the Creed 75 on Sam Hallas's page here :
http://www.samhallas.co.uk/repository/telegraphy.htm The 'Agregate Levers Assembly', the decoder from 6 bits (5 bit code + letters/figures) to the rotation and lift of the type cylinder based on levers with one end twice the length of the other looks to be a fascinating mechanism. |
16th Sep 2018, 2:45 pm | #10 |
Tetrode
Join Date: Feb 2009
Location: West London, UK.
Posts: 65
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Re: Creed Model 75 RP
Update!
I have cleaned up the machine and got the motor working (the brushes were stuck) and I have managed to get it to print a line of characters by wiggling the magnet lever. The motor timeout works fine and it re-awakens if I wiggle the lever. The next problem is getting the keyboard to work. This has been removed and cleaned but I don't understand how the key strokes connect to the rest of the machine. I have noticed that the Answer Back unit is missing! Is this part essential and does it connect the keyboard to the rest of the works? Chris |
16th Sep 2018, 4:33 pm | #11 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
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Re: Creed Model 75 RP
According to the manual (I have never seen one of these machines) the keyboard couples to the 'Translator Unit'. I think you must have that for the receive side to work at all.
Section one of the manual gives a good overview of how the units interact. |
16th Sep 2018, 7:47 pm | #12 |
Dekatron
Join Date: Feb 2005
Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW
Posts: 3,517
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Re: Creed Model 75 RP
I think you will need to knock up a power unit to supply loop current, and wire the machine for a loopback test in order that the keyboard transmits, and the teleprinter receives?
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Engineers make things work and have spare bits when finished |
17th Sep 2018, 5:02 am | #13 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
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Re: Creed Model 75 RP
(Unfortunately) you don't. The Creed 75 has the keyboard mechanically coupled to the selector mechanism. I say 'unfortunately' becuase it is impossible to use the machine for true full-duplex work, you can't avoid having a local printout of what you type.
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16th Oct 2018, 6:30 pm | #14 | |
Retired Dormant Member
Join Date: Apr 2008
Location: Banffshire, Scotland, UK.
Posts: 191
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Re: Creed Model 75 RP
Quote:
Wee trip down memory lane |
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17th Oct 2018, 8:20 am | #15 |
Hexode
Join Date: Apr 2006
Location: Medway towns, Kent, UK.
Posts: 271
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Re: Creed Model 75 RP
During my apprenticeship I worked in the Telex department for three weeks, one week was spent being taught, the next week was cleaning and the third week was in maintenance (In theory ...normally the engineer just said go home.) we used to dismantle and wash all parts in a paraffin bath to get rid of any mess and scrub off with a stiff brush. Then we used a warm air blower to dry things off.
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"Oh yes I love television, all those wiggly lines"! |
17th Oct 2018, 11:49 am | #16 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: Creed Model 75 RP
Quick Brown Fox anyone...
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17th Oct 2018, 2:31 pm | #17 |
Hexode
Join Date: May 2009
Location: Newcastle, Australia
Posts: 319
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Re: Creed Model 75 RP
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