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Member postings for Calum Galleitch

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

Thread: Left hand thread on a Chester drill spindle
24/08/2021 17:15:36

Well, having removed the nut, the pulley was absolutely not coming off the cone, so clearly the solution is just to have the nut tight enough! I put it back on and tightened it down with a bit of welly and we'll see how it runs!

23/08/2021 21:14:42

Thanks all - I think Brian and old mart are bang on the money, but to answer your questions: here's the parts from the manual

screenshot from 2021-08-23 20-56-43.jpg

Your can see the relevant parts are 75, 76, and 77. I've had the drill since March, brand new from Chester. It's seen very little use in that time.

To begin with, I had a real problem getting the belts tight enough to not slip under the lightest of loads - I was drilling 3-4mm holes in a bit of cherry and the drill was binding. The belt tensioning arm was quite short, so slipping a lever over it and tightening it up seemed to sort it. Then a few weeks ago it slipped again, which was the first time I discovered the nut had unwound itself. I agree it would make sense if there is any play in the cone then that will be causing bad things; I'll have a look tomorrow and see exactly how it all fits together.

22/08/2021 21:26:04

My Chester D20 pillar drill has a slightly odd construction, and I'm not sure if I'm missing something or the drill is!

Viewed from above, the drill spindle obviously rotates clockwise. The pulley wheel sits on a tapered cone that in turn sits on a keyed shaft that drives the whole spindle. The pulley wheel is held down by a thin nut (like an old-fashioned jam nut) that screws onto a thread, pushing the pulley down onto the taper. So far, so reasonable.

However, the thread is a left-hand thread (it screws on counter-clockwise from above), so the natural action of the pulley is to push up off the taper and then to unscrew this nut. The first time it happened, I didn't really think it through, I just assumed it hadn't been tightened properly to begin with. It happened again today and I don't think there's been five minutes of operation time since I last retightened it.

Am I doing something wrong here? Is there something missing? I don't understand why you'd specify a left-hand thread without good reason, so what's the good reason?! Should I just find another nut and lock it down?

Thread: equation editor
09/08/2021 00:09:18

It's a good example of making the simple things hard, but the hard things possible. The LyX frontend, by the way, is somewhere between WYSIWYG and screenfuls of code. The equation editor in particular is now very easy to use.

Thread: The shed may not be dead!
06/08/2021 13:13:12

Just out of interest, Neil, has it been reflected in subscriber numbers?

Thread: Pythagorean Triples … in Babylon !
05/08/2021 15:19:43
Posted by Kiwi Bloke on 05/08/2021 11:26:15:
Personal realization was trying to get to grips with musical notation, as an adult. It's a disaster!

Hmm, well. It's very easy to invent a notation system for music that is easier to understand; it's far harder to invent a notation system that accommodates extension as Western notation does. Many of the advantages of music notation as used in the West are only apparent to relatively expert musicians. And it is far simpler to learn to read than written English.

Thread: equation editor
04/08/2021 14:52:34

The program I always turn to for mathematics typesetting is LyX. It's a front-end for LaTeX, and it can do more or less anything LaTeX can do, sometimes more easily, sometimes less. I haven't used it to generate individual images for insertion into Word, but I would think it's possible. At worst screenshotting would work.

Also, w3c maintain a list of MathML editors here:

I don't know how well any of them work!

Thread: Install & commission of a Chester Cub 630 (Warco GH750)
03/08/2021 15:04:25

Surprisingly difficult to find an 11mm chuck key, but I did find a 7/16" key which needed just a hair ground off to fit. And, with a good bit of force, and an extremely alarming bang the camlocks came loose. I got the chuck off, and like everything else, it looks suspiciously like the original factory grease.

I mounted the four jaw up just to see that it fitted, after all that, and it does - just. The jaws will hold quite a large workpiece without protruding beyond the chuck anyway but without doubt one could accidentally do a great deal of damage if they tried!

Thread: Paypal payment delay
01/08/2021 14:44:10

I think it is also to do with whether or not the transaction has cleared. When you buy something with Paypal, it takes several days for the transaction to clear, and if it's stopped in this time it's unwound, like it never happened. Once it has cleared, it has to be unwound with reverse transactions - which would also explain Robin's experience!

Thread: New idea of engine and security window idea
28/07/2021 21:45:16

Hello Daniel and welcome.

The first thing I would recommend you do is research and understand the law around "intellectual property". There are several different types: copyright, patent, trademark, and so forth. It's important when you're working with a potentially valuable idea that you understand what the legal protections you have and can get are. In particular, you can't copyright an idea: copyright is complicated, but it only applies to something that actually exists.

I don't know much about steam engines (or window tinting, for that matter), but one think I can tell you is that in general, ideas aren't the tricky bit - the tricky bit is (a) turning it into a working design that can be manufactured, and (b) selling it.

A good starting point might be to create a computerised design, using a package like Fusion 360 or OnShape, so that you can work out what will be involved in making your device.

Thread: Metallurgical coal
24/07/2021 14:31:31

The argument the miners are making is that both steel and the coal to produce it are a fungible commodity, which is probably more or less true, and therefore we may as well reap the economic benefit of making it here. An argument I'm not unsympathetic to - mining and foundrying produce stable, well paid employment - but on the other hand we have to decide if we're serious about steering towards a zero-carbon economy or not.

Ultimately I don't think this is a technical decision - it's one to be made by politicians, who we elect to make these kinds of calls (albeit with the best technical advice they can get). Personally I do think there's something to be said for having one eye on the global geopolitical weather; a shooting war between two G8 countries is hardly unthinkable, and in such a situation you don't want to be buying raw material for your tanks and destroyers from the other side of the world.

Thread: Keeping the workshop cool
22/07/2021 14:07:31

You might consider those ice-cooler machines from on Amazon - if you search for air conditioning and look at the ones that are far to cheap to believe, most of them work by cooling air in melting ice, and you can usually acquire sacks of ice from a supermarket for a pound or two. Probably the cheapest solution for a few days a year; if you're overheated all summer then a proper AC unit would be the way to go. I wonder if you could get one from a scrapped vehicle? Those are designed to cool smallish spaces, but with much more heat input, so might be quite efficient.

Thread: Hydrogen
22/07/2021 14:01:55
Posted by Nicholas Wheeler 1 on 22/07/2021 10:07:38:

Just like any other 'new' system, how are you going to develop the infrastructure and who is going to pay for it?

One presumes in the same way we did for horsefeed, for petrol, for electric vehicles, as we did and do for any new technology deployed at scale.

There seems to be an awful lot of "wellwhataboutism" on this forum - the purpose of engineering is to solve problems, not find reasons it can't be done! It's one thing to say "I don't understand how this can work", it's another to say "and therefore it won't work"!

Thread: Gear Train Calculator
19/07/2021 13:52:58

Thanks Pete, that's very nicely laid out. I might have to steal some of your ideas! Like you, although in theory I know HTML and JavaScript, it's rarely used, so I'm learning as I go and it's a useful project for working these things out.

19/07/2021 13:08:02

Many of you will have seen this in the Lathe gear calculation thread, but as I've now started to adapt it for my own and perhaps other's use I thought it might be useful to give it its own thread.

My aim is to produce a simple, one page webpage that can be used to calculate arbitrary gear trains for a lathe with two compound stages. Features I have added are

  • Ability to set an input ratio (where the incoming drive from the spindle has already been ratioed down, and/or fixed wheels provide an initial gearing - my lathe does both!)
  • Ability to specify the first driving wheel for those with a fixed first wheel, so the user does not have to scan through rows of useless output

To use the webpage, go to **LINK** and you can simply fill in the details and run it on the webpage, or you can also save a copy on your local machine - it requires no other files nor an internet connection, it runs entirely locally.

The next two features I intend to add are the ability to input any available quick change ratios, and the ability to distinguish between trains with acceptable error and trains with no (theoretical) error.

I'm more than happy to add features, etc, if anyone would find it useful. I would be interested to know if there are other common layouts that it would be useful to accommodate.

Thread: Install & commission of a Chester Cub 630 (Warco GH750)
18/07/2021 23:56:54

Thanks John, that does make sense. I don't have any particular reason to suspect rust ingress - the likely explanation is simply that the chuck has probably never been removed since it was mounted ~20 years ago. That's interesting what you say about the connection getting tighter over time. Certainly sounds a better plan than having it shake itself loose!

I'll give it the WD40 and see if I can apply a bit more welly to it. I'm a bit wary about going full hulk on things like this because I can put a bit more weight into it than the designers may have had in mind!

Thread: English members who have moved to France.
18/07/2021 12:16:25

br, what about Ireland? Not cheap in the way parts of France can be cheap but depending where you're coming from, it can be very affordable - especially if you're willing to take on something needing some work - and a lot less culture shock. And though it rains regularly, the south and west climate is very mild.

Thread: Lower back issues
18/07/2021 12:03:19

As Rik rightly says, all backs are different, but one of the main causes of injury is that the muscles that support the spine do not get the work-out they need from modern lifestyles. A basic course of weightlifting - squats and deadlifts in particular - does a huge amount to help prevent injury, especially as we pass into the last third of our lives. Interestingly for many people weightlifting is also found to rehabilitate injuries, which might seem counter-intuitive.

Belts help by reinforcing what the stabiliser muscles do - which is why serious weightlifters use them - and for a one-off lift they make good sense. Wearing one all the time will in theory contribute to atrophy.

Thread: Vehicle reversing sensors
18/07/2021 11:52:24
Posted by roy entwistle on 18/07/2021 11:07:19:

I don't know about reversing sensors but about Christmas I parked in a supermarket car park, locked my Corsa using the remote and the Fiesta at the side unlocked.

Many years ago, my father, who was by trade a marine engineer, took a job in a motor garage after the collapse of the Clyde shipyards. On his first day, he was given the keys to a car - I forget the make but it was notorious for having only six different keyings - and drop it off, then walk half a mile and pick up another car of the same make at such and such an address. In a fit of absent-mindedness, he dropped the first car off, put the key in his pocket, walked to the new address, saw a car of the right make, put the key in it, and drove it back to the garage, promptly followed by the Old Bill, wanting to know why the garage had branched out into nicking cars.

Thread: Install & commission of a Chester Cub 630 (Warco GH750)
17/07/2021 23:01:06

I have the two V indicators similar to this pic (not my lathe):

screenshot from 2021-07-17 22-25-04.jpg

I don't have the I indicator at the top, but the socket itself is pointing between the Vs so I am fairly sure I should be turning anti-clockwise to vertical:

screenshot from 2021-07-17 22-25-27.jpg

I've got WD40 on hand, though I've seen suggestions that more powerful alternatives might be better - but I've no idea what they might be!

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