A milestone was reached yesterday – the last of the LCP cabin canvas awning frames was stripped of paint. The original LCP paintwork was in such poor condition everything is being taken back to bare metal.
There are now only a few small items left to restore, paint strip and prepare for priming, and all the LCP cabin fittings will be ready for re assembling.
Repairing one of the damaged sections to the frame of the LCP cabin has commenced, there are two, and we are pleased with the results. See accompanying photo.
Back at the workshop more work on the PeriBus simulator has been carried out, using an Arduino to set the logic levels for addressing and data on the PeriBus. A set of CHARGE cards has been brought back from the LCP for testing the failed monitor in the workshop. A case of confirming if the flyback transformer is responsible for the failure, hope not.
Next week we shall be re-assembling and painting.
The 84 brackets for the LCP’s roof canvas support frames have been refurbished and primed ready for a top coat. Work continues an refurbishing the canvas support frames which starts with removing all the old paint, a very time consuming task.
Work started on repairing a damaged (very bent) section of the LCP’s cabin frame. A certain amount of straightening has been carried out but a short section of the ‘U’ channel frame has been folded in on itself. These sections, there are two of them, are being cut out so a repair can be fabricated.
The simulator was run up but a failure occurred with one of the four large Mitsubishi video monitors, accompanied by a smell of burning. The monitor has been removed for fault finding and hopefully repair. This is the third monitor failure in the past nine months, the two previous unserviceable monitors were successfully repaired.
Pete M spent some time making videos of jamming scenarios on the simulator. Making videos creates a permanent record of the Bloodhound simulator running and also provides for clips to be put in the public domain. Follow us to make sure you do not miss these videos being added to our YouTube channel.
No photos with the report this week.
Neil and Pete H. carried out an assessment of the most damaged (bent) part on the LCP’s cabin frame. While the simply bent ‘U’ channelling of the frame can be pulled straight there are two sections where the ‘U’ channel has been folded in on itself. After some consideration Neil and I came to the conclusion that the folded over sections of the frame will need replacing. So, by next week we will source aluminium strip and angle to fabricate these two sections of damaged frame. A start on repairing the ‘U’ channelling will be made next Saturday.
The simulator was run up and it remains fully serviceable. We also tested two suspect WEETABIX cards and the PeriBus Termination card, the latter being serviceable but the WEETABIX cards were unserviceable. The cards were removed from the Argus 700 I/O system some time ago as being in an unknown or ‘U/S’ condition so this was a double check. The WEETBIX cards will now be checked out in Pete’s workshop (AKA spare bedroom) and hopefully repaired. One WEETABIX has one of the two channels U/S and the second appears to have a permanent BUSY set on the PeriBus.
The day was mainly taken up by priming the numerous brackets for the rails for the canvas awning (must be 100 of them) and stripping paint from the rails themselves. Not a favourite occupation but it has to be done.
Neil and Pete H. focused their activities around two main tasks yesterday – completing the priming of cable duct covers and their fittings and more importantly a start was made on repairing some damage to the frame of the LCP cabin.
Damage was caused to the cabin frame when the cabin was being lifted without a spreader bar. The damage occurred several years ago but as restoration of the cabin will be completed over the next few months the time had come to carry out the frame repairs. The photo shows the section of the cabin’s frame most severely damaged being straightened before the skin is repaired.
Here are the LCP cabin awning support frames and below the cable duct covers after priming or part primed, they’ll be as good as new!
The simulator was run up and ran for 2.5 hours without any problems. One reason for running the simulator was to test a Serial to Parallel PeriBus card, three of these cards are used in the I/O rack for the Argus 700. The card being tested had been repaired using the developed PeriBus simulator which sends the correct logic and timing to a Serial to Parallel PeriBus card (and other I/O cards) for bench testing. The repairs carried out to the card were the replacement of two TTL devices and re soldering of a dry joint. The repaired card ran in the simulator with no problems so has been declared ‘Serviceable’.
The main task was to complete the restoration of several budget locks for the LCP cabin’s cable duct covers. Some of the original budget locks were very badly corroded and are being replaced with second hand locks which in turn are corroded but not as bad as the originals! Accompanying photos show the ‘new’ budget locks de rusted, cleaned and primed, note the pitting and wastage cause by corrosion.
Budget lock fitted to a dust cover:
Tasks are also being carried out on the T86 cabin, the latest being the restoring of the lenses for the main lights on the cabin. Copious amounts of paint stripper were used to remove paint to get them to the condition shown in the accompanying photo.
Off-site work continues with development of test equipment for the Argus computer peripherals. We have schematic and component placement diagrams but no test specifications.
The main effort at this time is development of a PeriBus simulator, the aim being to create a test set to fault find on the Argus 700’s I/O system. Accompanying photos show the current status of the PeriBus Simulator, built from TTL on prototyping boards and an Analogue I/O chassis under test. The Analogue I/O chassis has just the Serial to Parallel PeriBus Converter card (on an Extender Card) and a Termination card fitted to allow testing of the Serial to Parallel PeriBus Converter which is known to be U/S. Currently the PeriBus Simulator is working in that it provides the correct bus timing and logic, it is now a case of creating a test routine. Logic levels created by the PeriBus Simulator are being ‘scoped’ on the Serial to Parallel PeriBus Converter card. Obviously this is still work in progress.
Yet more pop rivets, nuts and bolts have been acquired in preparation for reassembling the fittings to the LCP cabin.
The LCP cabin was heated for the day but the simulator was not run.
Yesterday was definitely a ‘keep the hangar doors closed’ on a wet and miserable day with snow and sleet showers. It felt quite snug in the hangar, at least compared to outside.
The refurbishment of the LCP cabin ‘attachments’ continues. Such tasks always take longer than you think but we are getting there. The objective is to get everything in A1 condition before refitting along with a complete set of ‘bits’, rivets, nuts and bolts washers etc. so refitting will be a straight forward task on the day. This week’s photos shows a few of the tasks carried out on Saturday:
Duct Cover Securing Plate – An example of a metal fitment used within a duct cover. In this case both bolts were so badly corroded they sheared when trying to remove them, the remains being hacksawed off. Attempts to drill out the old bots got nowhere so the plates, there are two of them, will be remade in aluminium.
Half a Duct Cover – A salvaged cover that is replacing a missing cover. To complete the refurbishing of this item the missing hinges have to be replaced along with the badly corroded and missing rivets.
Polished LCP Canvas Support – Neil continued with his mission that he should be able to see his face in all metal items before they get repainted!
Away from the hangar the purchase of ‘bits’ continues including new pop rivets, nuts and bolts, etc. One change being made is that all the original nuts and bolts securing the canvas frames that had castellated nuts secured with split pins will be replaced with nylon lock nuts and washes will also be nylon instead of metal. A decision partly due to our lack of engineering facilities to drill bolts to take split pins.
Also away from Cosford: The development of a PeriBus simulator continues apace and nears completion. The purpose of the simulator is to create a test rig for the testing of the I/O cards for the Argus 700 where addressing and data can be set to exercise functionality in I/O cards. The current status of this project is that the PeriBus simulator is about to be connected to a spare Analogue box to see if it can provide an input that can be seen by the Serial to Parallel Converter card in the Analogue box. Watch this space!
The simulator was not run on Saturday but a fan heater was run in the LCP to warm it through.
A good day with a team of four in action, Pete M, Ian, Neil and Pete H on the continuing task of restoring the LCP cabin and its fittings. Ian and Pete M spent the morning finishing filling and smoothing the cabin skin, finally apply primer to repaired areas.
The rest of the time being spent on the cable duct covers and fittings for the LCP cabin. The ravages of many years in the open have taken their toll of the various components attached to the LCP cabin.
The cable duct covers have already been partly restored but many of the fittings they contain are missing, damaged or badly corroded. Yesterday saw the final audit of component parts to check if we have enough salvaged spares (from a derelict LCP) to get all fittings in these covers back to an A1 condition. All bolts, nuts, washers etc. are being replaced with new and the audit confirmed we have enough parts.
This photos shows an original cable duct cover with its deteriorated seals, a missing lock and corrosion on the non-alloy parts.
A second photo shows the collection of salvaged parts to make good the original covers.
The simulator was run up and remains serviceable.