Member postings for andrew lyner

Time to consult the oracles again.

I guess I am doing something wrong here but collets like the ER25 should be extra good at holding (I would have thought) as both inner and outer bits squeeze down on the tool. I have problems with the tool working its way up inside the collet.

I make sure that the holder, collet and nut are all pretty clean and I sock it up pretty tight Do I need to be extra scrupulous a bout the cleaning? I have eyeballed the inside of the nut and the holder and there doesn't seem to be anything amiss. is there a step that I'm missing. Is lubrication a good thing or a bad thing here?

Possibly but the worst that can happen is the rubber going soggy or disintegrating. Three s/s bolts undone will allow replacement. I think cast iron beats dog ball rubber.

I’ll risk it - unless you’re volunteering to make me two 2” lignum vitae balls. 😁 lol

These guys are much more reasonable than I expected. A quick email to them gave the response

"We have 50mm diameter nitrile rubber balls (density 1.2g/cc) 70 Shore A @ £7.20 each
Otherwise 50mm diameter Natural Rubber (1.6g/cc) 65A @ £3.00 each" (Plus VAT and p/p, of course)

I was all fired up to go for that Then I tried the dog's ball idea and found just the thing. If they are no good then someone's dog will have a lucky day!

pub.co.uk could be useful later as they are not silly expensive.

Cheers

Andrew

No, not a Ram Pump; there's no water flow to drive it. It lifts water up from a tank, underground.

@Nigel G; "1) "Pressurised." A lift pump is not "pressurised" . A lift pump works by suction alone"

That's the clever bit. The lift section lifts water into a first chamber then the inlet valve closes and the piston moves down and forces water into the second chamber. This chamber is inverted with air at the top which gets pressurised with additional strokes. You can put a tap on the delivery pipe which can use the stored water (as long as the second ball valve doesn't leak

It's a principle that you can see in a number of designs. It avoids the splosh splosh that you and to get with ordinary hand pumps (like my grandparents had as their supply in the 50s)

"2) I assume the gaskets are between flanges holding the pump casing parts together. If so the pressure acts only on their edges exposed to the waters as the bolts take the forces trying to push the pump apart."

It's all very low pressure so the gasket needn't be very strong. As you say, if the faces are reasonably flat, the gasket only needs only to be thick enough to fill the valleys. I will have to go to a bit of trouble with that but the machine is pretty easy on the joints

I'm grateful for all the opinions about replacement balls. I think they may end up as billiard balls. Wood would need to fairly dense so that they balls fall into the cups fast. The old balls are pale 'wood' (?) with no obvious grain but they are just flaking to pieces.

My neighbour has an ancient lift pump to get rainwater water from an underground tank. It's in a bit of a state but most of it's brass with a cast iron bottom section so I have high hopes of renovating it for another sixty years. It's a 'pressurised' model with a pressurised reservoir of a few litres (clever idea) and the two valves use 2 inch check balls. The originals look like hardwood (it's probably at least 60 years old) and are flaking and chewed up.

I did the usual google trip and there are several sources of 2" check valves with the right sized balls but no one seems to have actual replacement balls. If I grind the seatings to remove any sharp bits then hard plastic snooker balls would probably stand it but something softer would be better, I think.

I can't turn 2" nylon myself (Mini Lathe) so I need a source of ready made balls. Any ideas, apart from ebay snooker balls at £3 each? Perhaps I could coat them with something?

Interestingly, corrosion is not too bad - it all came apart with plus gas. But the lift rod end had just rotted away to a point at the piston end. I will do that bit with s/s, I think.

The gaskets are all hardened and cracking. I need something thickish to replace them but stronger and less buggy than neoprene as the force from the whole lifting mechanism acts on those gaskets. I suppose a good flat seating is the way forwards. Some 'fibre' perhaps?

He's been on the forum since 97 (24 year+) and his posts are good quality and useful for Maths students and others. Can he help it if what he writes is liked? PF has a very large following of students as well as experienced Physicists and (real) Engineers. There is a broad range of topics and some real quality information. Does the presence of likes affect all that quality in any way? How would you know that a similar, healthy number of likes would go to the heads of our ME experts (or even some of the contributors to this thread) and give them ideas above their stations?

Oh boy - I just had a notification of yet another post. Is this all so frightening chaps?

An impressive bit of sleuthing there. What was your aim? I notice it was a private message. Did you read the posts that were referred to?

Edited By andrew lyner on 19/02/2021 23:15:37

How could you come to that conclusion`? The post that got all the likes had a good video. Gaussian 97 made just one post which was liked and commented on six times. Didi it really look like he was an "aspiring influencer"? Do you have evidence from elsewhere to support your claim? That thread proves nothing negative at all about Likes. They all seemed pretty appropriate to me.

It seems to me that you just don't like the like idea and will fight it all the way. I could say that you, yourself are an "aspiring influencer" in that you want to influence the future of the like. Is that bad? Forums are posted on for the purpose of influencing although they are often used as a source of information.

Personally, I am trying to 'influence' what happens with this forum software. It is sadly lacking in many facilities which some members don't seem to be aware of.

I could imagine there were similar rejections on the forum of CNC and DRO in the not too distant past, on the grounds that neither was worth while and actually harmed the purity of the techniques of the time.

Edited By andrew lyner on 19/02/2021 23:07:06

The point of my invite to look at that forum was not the subject matter - it was the way it works. The Likes are no more than a murmur of "hear hear" during a debate. I can't imagine what experiences some members must have had on other forums to feel so strongly against this. Obviously there are more of them around like the Falmouth Packet forum.

I used to live in Plymouth as a young lad so Lyner and Lynher were frequently confused.

.

Is the following a good example of what you might call a "ruined forum" ?:

"I suggest you all spend a few minutes on physicsforums.com That will possibly be quite enough for non-Scientists."

I remember an old Guinness advert "I don't like it 'cos I've never tried it"

I suggest you all spend a few minutes on physicsforums.com That will possibly be quite enough for non-Scientists.

Just pick a topic with a reasonable number of posts and see how Likes can be used to effect. People are largely very polite and helpful and compliment each other when a good point has been made.

No punchups in my nearly ten years of membership!

Not too surprising - even though it's disappointing. But my earlier comment about comparing like with like (seriously, I wrote that without intending any pun) is relevant here. The Falmouth Packet will be a social / semi local historical forum, populated with people who love Falmouth but who have no other common interests.. Many of them will not be able to justify their comments etc. etc. Can you really compare it with ME?

As an Old Truronian, I am sad to read your story.

Thanks for that- you are making my point here as I have no idea which post those thumbs actually refer to? With this inadequate system, I have to assume they were meant for me. Could you do the same for a a post that's ten positions up in the list? Or - if you quoted the whole of that post, how could I conveniently read it in the context of adjacent posts?

Andrew

Could you quote an example of exactly what you mean? How could it come about on ME No one is suggesting a string of emoji could possibly convey the sort of information that ME deals with.

How many threads per inch?

It just doesn't work.

I would love to read a serious objection to Likes that is based on actual experience of it being problematical on a specific (quoted) forum that is tech based. Evidence is always useful in an argument - not just prejudice. I am assuming that no one would quote a "Technician's" type thread. Plumbers and heating 'engineers' are far too free with rude comments to be counted as evidence, related to the hallowed halls of ME. Sport fora would also not count - and political fora.

Andrew

Edited By andrew lyner on 19/02/2021 20:11:57

The total posts for a thread are visible but not the #number of the post within the thread. This would allow reference to a particular post without yet another massive quote.

The fact is that the forum system has been developed significantly over the past few years. Many issues have been dealt with and I don't think there's much doubt that there are many actual improvements. I am a bit baffled why Engineers (thread members) are so reluctant to appreciate advances in such technology.

Andrew

The emogee is not the same as a like because it has to be in a reply, which may be miles away from the post it refers to - so you would also have to quote it. This clutters up the thread with perhaps many repeats of the text.

I have to ask whether you have used 'like' elsewhere.

The standard way to display a like is "Xyz, Abc and 23 others like this" and it is visible at the end of the post.

Andrew

Yes, why not? But I have to assume members use other fora (?) so they clearly know what they like already.

I have just got to the end of a thread on a different and very technical forum, about adding a DC supply to a battery powered unit. I asked the question and I had several replies from several members. Was I supposed to reply to each post, formally, complete with quotes from those posts? Putting Like after appropriate posts and answering others worked very well and everyone was treated 'politely'. Not a hint of hoi polloi using likes like confetti.

And, whilst on the topic of possible improvements, posts don't appear to have a 'post count' number so I can't see just how many posts the subject seems to have generated. It does look like a hot topic though.

LIKE

That was an effort for me.