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Member postings for RRMBK

Here is a list of all the postings RRMBK has made in our forums. Click on a thread name to jump to the thread.

Thread: What are these wheels /tyres?
21/06/2019 21:36:33

Michelin make alternative filled tubes, known as Bib Mousse ( after their mascot Bibendum ) for off road endurance motorcycles.and they are exceptionally good although a bitch to fit ! Having developed the concept it wold seem logical for them to make them for ATV's, possibly worth a look.

Thread: combustion chamber testing
21/06/2019 19:13:39

Duncan and John, thanks .

I am also using old inner tube, but I tend to leave the tube lengths slightly different to help feeding them in the SB tubeplate later on. I have cut them to the same length but not successful. Unfortunately you cant reach the inner ends of the tubes because of the cross tubes in the combustion chamber. I've been through all my back eim copies without success, so I presume it must be in one I loaned out and didn't get back. sods law !! Just cant remember what he actually used, so if you can find it I would be most grateful.

Cheers Brian.

21/06/2019 12:16:50

Forgot to load photos DOH !!

Look under album Test rig.

21/06/2019 12:07:24

Good morning All.

I am building a locomotive boiler ( LBSC / Josslin Uranus ) and have tested the silver soldering of the cross tubes in the combustion chamber to 200 psi all good. Now the combustion chamber has been soldered to the tube nest I am trying to test the combustion chamber to front plate and the tube nest joint, inside out so to speak; as once its soldered in to the boiler you cant get at it at all.

I cant seem to get a good enough seal on the tubes at the smokebox end to get pressure up sufficiently high and don't want to tighten up the test rig any more in case a tube buckles.

I seem to recall an article in EIM regarding a similar test and how he sealed the tube ends, can anyone point me in the direction of that article or have any ideas how a better seal might be achieved ? I had considered making ali or wooden plugs and fitting with silicone, but I am concerned about them swelling the ends of the tubes and the difficulties of getting them all the same length.

Over to the knowledgeable ones from this old dunce !

Thread: Conundrum for the collective!
20/03/2019 19:42:55

Hi Paul.

Age may be a relevant factor. Some marine engine builders will have machined the couplings in their own build yards, and bored them to suit the shafts. the hole spacing is then determined by the shaft diameter, being positioned midway between the bore and the OD. That's certainly how we did it when re - engineing some work boats of similar horsepower. Particularly awkward to use a Din or BS standard on a shaft built before they were introduced !

Thread: Yet more confusion!
12/01/2019 19:34:55

We have never enjoyed a stable climate.

We have never enjoyed a stable political system.

We have never enjoyed a stable economic system.

What have we ever enjoyed that could be classed as stable?

Horses ? wink

Thread: Getting priorities right
07/12/2018 18:05:41

Our beloved representatives ( MP's) of all colours, agree that the national minimum wage is around 8 quid an hour, the average working week under the Working time directive is around 40 hours . In my primary school maths, the government are saying that a person can live on £ 320 per week. give or take a few quid.

On that basis,how come anyone can be offered benefits that amount to more than that sum ? Equally important for many of us on this forum how come a young fit able person deserves £320 per week but a pensioner only deserves around £120. ????

Obviously maths is not the Government,s strong suit

Thread: Thread Wires.
04/12/2018 19:01:27

in the US Chips are our crisps and Fries are our chips. and ive never seen anything yet in my swarf tray / chip pan that looked even remotely edible!!

Thread: Quick release hook
17/11/2018 17:54:46

Google pelican hook. no need to re invent the wheel , we used these on the anchor chains for rigs with 40 ton anchors hanging on the end and they were tripped remotely with a long pendant , so you can get them any size you want. only work with chain though, not with wire.

Thread: Solution found to the World's biggest problem . . .
09/11/2018 12:28:52

I am still regularly riding my 750 BMW that I bought new 42 years ago. Over its lifetime it has taken me to work regularly and on long distance europe trips. I have carried out various repairs but it still starts first time and I can still get spares for it ( although at rather exorbitant prices!)

I recently visited the Triumph factory at Hinkley, great day out and very interesting . Very tempted by a new bike but will it still be going in 40 years time i'm not sure? will I be able to get spares , I suspect not, can I service and repair it myself absolutely not !!

Exactly the same applies to my 26 year old Peugot based motorhome in comparison with a new one,

Companies profits and shareholders dividends are based on selling us a new item just as often as they possibly can and marketing is based on convincing us that things we might only actually want are things we desperately need.

Like NDIY all my machines are over 40 years old and still perfectly fine.

Thread: Holbrook 10B lathe
16/10/2018 14:39:59

A very good point Brian ( the other one ! ) but when I swapped my South Bend for the Holbrook I kept most of my chucks, backplates etc and all of them fit perfectly.

I think that boxford cloned the S.B and that the 10B was then subsequently designed to use S.B / Boxford accessories to avoid having to develop new stuff. I suspect the other alternative at the time being the Myford parts, they were considered not beefy enough.

15/10/2018 21:20:35

Hi Anthony.

I put the original listing up as mine is no 18 and came to me virtually from its original buyer.

Your chuck backplate should be no problem as it is the same thread and register as a Boxford or South bend so one from either of these can be used. From memory I think it is 1 1/2 " x 8 tpi.

Whereabouts in the UK are you? and are you visiting the Midlands Exhibition? I will be there Fri Sat & sun .

I also have a manual you can photocopy although it isnt really up to much !

Kind regards


Thread: Graham Meek - Mods to (copies of) Picador Drill Grinding Jigs
08/09/2018 14:41:12

Hi all. Did we ever get to answer the OP original question - where are the drawings to be found.? I would also like to modify my non picador jig and would like to access the drawings. I have looked through the eim index and my back copies of eim but cant find anything.

So if anyone does know or can post the info please share the location!

Thread: Thermic Syphon
16/08/2018 12:13:11

Can I go back a few posts and pick up the point made by Brian G . I find it difficult to understand the inspectors comments viz :- " consider redesigning the boiler in order to abandon the combustion chamber completely as it cannot be tested before it becomes completely inaccessible "

Firstly if you are re-designing the boiler it is surely no longer a published design benefiting from " grandfather rights" You would need to get the altered design proven by calculation and as Duncan rightly points out who will sign it off? Not the boiler inspector I suspect!

Secondly having built a combustion tube boiler with cross stays for LBSC Uranus which is very similar size to a Brittania boiler in 3 1/2 G, one can either test the combustion chamber alone by blanking off both ends and pressurise from the combustion space outwards.

In my case I also fitted the end tube plate and the embryo firebox and throatplate, and it can then be tested up to full pressure by blanking off the firebox base, and the tubeplate ends and pressurising "inside out and upside down" so to speak. In my case I used an aluminium plate with a rubber gasket around the grate opening with a connection for the boiler test pump and a vent. I did it this way because all these joints were brazed with 750 deg silver solder and the remainder of the boiler is with 580 / 600 to avoid disturbing these joints at the later build stages. This will confirm the cross tube and the throatplate joints.

I agree that boiler inspectors take on a huge responsibility voluntarily on our behalf, and a proper set of standards for design and construction along the lines of the Australian code would at least give them all a standard to work to and avoid individual interpretation.

God forbid we should have an accident somewhere, then everything will be put on hold until we do get a code and a set of standards approved, which wont be a quick process; and the ensuing limbo will mean no one, not even the commercial builders will be in a position to build a boiler without knowing what the future standards will be. So perhaps the way forward is to be proactive and get it before the event.

Thread: Pickle
21/07/2018 20:11:54

Citric acid is really good, safe and cheap. you can get 1 kg bags on flea bay for a few quid and I use about one large tablespoon in a mop bucket. cleans up copper easily and quickly and if you have a spill there are no nasty consequences particularly for pets For steel I use brick cleaner. again cheap, easy to buy and as I rarely silver solder large steel items I keep it in a large screw top jar and just drop the item in hot and put the lid back on loose to contain any fumes.

Thread: 3" Burrell build
17/07/2018 20:40:26

Hi John.

I have the same engine and share your frustration with the very poor standard of the drawings ! My steam manifold ( steam head ) is fitted with two bolts into the manifold which then pass through the spectacle plate and through a square plate with 4 holes in the corners, fitted on the other( front) side of the spectacle plate. This small square plate is then anchored to the spectacle plate with the two bolts above that you can see in the pic. I'm not good with photos and computers but if this doesn,t explain it come back to me. The square plate is shown at the bottom LH corner of drwg 109, but the drawing of the steam head shows all 4 holes as being located in the manifold which is clearly impossible because the plate would then block the entry of the manifold inlet fitting from the boiler.. So basically the two lower holes in the plate match the upper holes in the manifold and the two upper holes in the plate, bolt through the spectacle plate above the manifold.

Kind regards bk.

Thread: OT: Stuart Turner Single Cylinder Marine Engines
06/07/2018 21:52:56

Had a couple of these in sailing boats over the years. In what way is it "unhappy" Like most little 2 strokes the right mixture, a good spark and clean ports are all they generally need .

Thread: testing injectors.
10/06/2018 15:49:12

Good day all

Does anyone know or have experience of whether it is feasible to test an injector off line against a pressure head by using compressed air? Obviously there is not the same amount of expansive energy available, but will the inlet flow being gas rather than wet steam stop it from working altogether?

Thread: Shortening screws
16/03/2018 16:26:57

+1 for a simple lantern chuck.

I just got an M10 bolt with plain shank of about 12mm left once the head was cut off . Get a number of M 10 nuts and solder or silver solder them onto a piece of scrap brass sheet to cover over the front of the nuts. Then screw nut on , mount in chuck, trim the brass plate to diameter , drill and tap whatever size you want and there is your lantern chuck. Unscrew the nut to fit your screw of whatever thread you choose. Helps to mark the nuts with whatever thread they have been tapped - dont ask how I know !

I actually drilled down into the M 10 bolt end and fitted a little copper pad to cover the top of the M 10 thread with a spigot on the back to locate it in the hole, this prevents damage to the screwhead.. Also to help with longer screws, I fit a loose piece of copper of brass bar into the same hole , the right length to accommodate the length of the screw I want remaining inside the chuck. When doing this I find it best to also tighten up a nut on the inside of the lantern chuck facing / securing nut.

For shortening studs I use a "stud box " A short length of Hex bar say 8mm drilled and tapped through with the thread e.g 6 BA. leave thread tight , I use second taps only. On one end fit a 6 BA bolt and nut. In the other end place your embryo stud. Adjust the bolt and nut to give the exact length of stud you want and lock the nut. Hex bar in lathe and form the end of your stud. Reverse the stud in the stud box and form the other end. " Ditto repeato" This morning I did 20 6 BA x 1/4 long studs in far less time that its taken to type this !!

Happy workshop time All.

Thread: excellent service
06/02/2018 22:21:28

After a trawl on the net the best price for a pretty mixed order of B A bits and pieces was with EKP supplies. I placed the order at 15.00 hrs on Monday and the parcel arrived at 10 15 Tuesday . Personally, I think that is excellent service and deserves a mention.

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