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Member postings for Joseph Ramon

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

Thread: taps&dies
01/05/2012 10:15:14

It depends. If you are servicing things, then you need the taps and dies that match what you are working on.

If you are using bought in fasteners, the chooses taps and dies that you can get fasteners to match at an economic price.

If you are making parts yourself, then it dosesn't really matter what you use, as long as it suits the materials.

Most folks would have BA for small sizes, metric for large and things like workshop equipment (in the past they would have had BSW or BSF for this) and a few sizes of 'ME taps and dies, which are whitworth form but in 32 and 40 tpi (i.e. quite fine) and ideal for threading pipes and small fittings where a larger thread (e.g. metric) won't fit or is grossly out of scale.

Joey

Thread: Aircraft General Discussion
30/04/2012 16:49:19

The protoype Vulcan was notoriously rolled. Some were rolled at airshows but had to have structural checks afterwards.

Joey

Thread: Opinions on four jaw chuck alternative by Harold Hall?
30/04/2012 11:02:20

Hi Harold,

"Having a much greater mass, small errors in the balance of the workpiece and its clamps becomes less significant resulting in less frequent need to balance an assembly."

With respect, I imagine that the reduced speed you use when turning such a large mass makes the difference. An imbalance of 100 grammes will exert the same force, regardless of overall mass.

However, having such chunky holders will mean that relatively small movements can correct an imbalance, making adjustment easier.

Joey

Thread: Piston Valves
20/04/2012 16:36:07

My first attempt was a crude piston valve engine. I later built a more sophisticated one.

While it is possible to do this succesfully with little experience you will find that a slide valve is much easier as the mating faces are flat so it is easy to get a good seal. Getting piston valves right requires machining to a higher standard to get the same level of performance.

Oil grooves or o-rings will work, but o-rings can be cut to pieces by the sharp port edges that give good crisp vave events.

But you won't go far wrong with teh link that Bog's has suggested.

Joey

Thread: A useful Stirling engine.
20/04/2012 11:01:17

"Last weekend I was at an event in canberra called The Mont. This is a 24hour endurance mountainbike race,"

I look forward to seeing someone compete on a Stirling Cycle.

The Sirus-based generator package was designed by Ian Bradley of 'Duplex' fame.

Dick - I deal with a lot of H&S in my job, in an industry that sometimes, but thankfully very rarely, kills people. There is an industry itself in propagating the elfinsafety myths, but most of them are myths. The HSE is much more proprtionate in its approach than people think - we had a RIDDOR a couple of months ago. It was clear (afterwards) that we need to take some remedial action to prevnt a repeat. All we got from HSE was an acknowledgement of our report. If it happened again, we would be in trouble, but we can document that we have acted to eliminate the hazard and in all honesty none of the cations required were very expensive or time consuming. What was costly was paying for a staff member to sit watching digital TV for eight weeks.

Joey

Thread: 55 degrees or 60 degrees
20/04/2012 10:52:15

I understand that many modern cars use whitworth threads for the cylinder head bolts as they are less likely to strip in an alloy block.

Joey

Thread: filing cat iron
26/03/2012 15:54:29

I hope you wore a face mask, or are you blowing black gunge out of your nose now?

Joey

Thread: Spammers
23/03/2012 10:07:41

Hi David,

The powers that be might want to use Mollom as a cost effective way of controllijng website spammers.

http://mollom.com/

Joey

Thread: MEW188 Editors bench letter
12/03/2012 13:09:40

It's no coincidence that the Stuart 10V used to be the standard entry point for model engineering, It comes with all the fixings, so no extras needed. It's straightforward to build and there's a good instruction book. It's small enough that you can build it on a 2 1/2" centre lathe and no milling machine. Even for a novice it's only amonth or two's spare evenings of work. Finally, as long as it isn't stiff even if you haven't made the best job in the world you can run it off low pressure steam, an air compressor or even a tyre pump.

I think the problem we face is that too many designs out there are overly complex and expensive, but mostly that they require extras to be bought and lack simple, step by step instructions (the killer for most peopel is how to safely hold the unusually shaped parts - a picture and a few words can solve this at a stroke).

Joey

Thread: Flat battery
12/03/2012 13:02:55

You can sometimes rejuvenate a Nicad pack simply by puttibng as much charge as it will take in, then shorting it with a thick wire for a few seconds. As mentioned above you are trying to burn out the 'dendrites' in the shorted cells.

A failed pack is almost always just one duff cell, easy to replace but be aware that another cell will fail in turn.

Hard to run such a drill off a transformer, as they can take 20 amps peak which might be about 300 watts.

Joey

Thread: Northern Modelling Exhibition
06/03/2012 09:32:44
Posted by David Clark 1 on 06/03/2012 09:22:16:

Hi There

Sandown is just outside London, the capital city and central to the UK.

All the main railway companies have terminuses in London.

Who in their right mind would have a Model Engineering Exhibition in Birmingham?

regards David


David,

If that's a joke, please add a smiley.

If serious...

Joey

Thread: Over engineered?
06/03/2012 09:17:56

Back in the 1980s even Dixcel was recycled - made from used computer listing paper. Most posh loo roll is recycled, they just don't market it as such.

Joey

Thread: 3 - Jaw chuck on Clarke 300 lathe / cutting speeds for brass / steel.
15/02/2012 14:13:53
As you can vary the speed continuously you can change it if the tool is struggling or you get chatter. You will learn more and get better results by experimenting this way than by using calculated speeds. The right speed for a job depends on tool shape and sharpness as well as work diameter and material. You will be surprised how being able to change the speed helps you learn and how little you change it once you get used to the lathe.
 
Joey
Thread: Windo winder
15/02/2012 14:05:51
Your best bet might be breakeryard.com you should be able to get one for a fiver.
 
You can always tell the S.O. you made it on the lathe...
 
Joey.
Thread: Forum niggles
13/02/2012 14:01:05
More tea, Gordon?
 
I rarely get the chance to vist here Apolgies if some of my postings are left hanging.
 
Joey
Thread: 3 1/2" Gauge Hooks and couplings
13/02/2012 13:58:30
How did you make/buy the chain?
 
Joey
Thread: Metal thefts
16/01/2012 12:41:45
I saw a sandwich board by the side of the road the other day, professionally done, for a nearby scrappy: prices for lead, copper, brass and cable.
 
'Incitement' - although I wish I could buy brass at their prices!
 
Joey
 
 
Thread: NEW MAGAZINE FOR MODEL ENGINEERS
09/01/2012 17:16:13
2012 will see the launch of a new magazine to be distributed via subscription
only and selected outlets; being intended to fill a need in the market and to
compliment the current offerings in the arena and so seeking to work
alongside them, whilst at the same time offering subscribers’ value for money
as one of its core values.
 
It's good to see the highest standards of editing will be used and that the new magazine will be heaping praise on its erstwhile competitors...
 
Joey.

Edited By Joseph Ramon on 09/01/2012 17:26:02

Thread: Northumbrian - Steam Chest Dimensions
21/11/2011 09:10:30
The slide valve should not need the insides of the valve chest to keep it in alignment.
 
Making the steam chest aperture as big as possible will be beneficial, as it reduces the 'wiredrawing' effecty when most of teh steam for teh cylinder has to come out of the pipes.
 
Joey
Thread: What would the "perfect" IMLEC competitor model be like?
14/11/2011 13:39:50
I suspect that a much more efficient system could be set up with some clever non-standard trickery, especially if the whole thing was under microprocessor control. This could allow the boiler to work on a much wider pressure range - run the fire hard and build up a lot of pressure, then damp it down and run on stored heat for a while. Monitor the smokebox temperature to detect if and when heat is being wasted up the chimney.
 
Use electrically operated poppet valves for steam admission and exhaust , so you dynamically adjust the timing and cut-off to give smooth efficient running despite varying pressure. Cut off the steam supply completely when 'coasting', or just allow through a small amount to keep the cylinders warm and the fire in.
 
I reckon a 50% increase in efficiency could be achieved this way with models, much less at full size.
 
Joey
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