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Member postings for norm norton

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

Thread: A Welding Problem - Steel Type?
25/05/2021 09:08:30

Thank you Nigel, you have done something that only the very best posters of questions do - summarise what you have learnt from the various replies and what you might do next. We all learn from that and appreciate the discussion!

Thread: Who uses airbrushes?
23/05/2021 18:02:49

HVLP - agree fully.

I think a lot of the HVLP description is a marketing gimmick. Those guns I described still need 30-40psi and probably behave just like historical spray guns.

23/05/2021 15:14:14

Hello Peter

I understand what you are asking. My answer is that you need to select the spray gun tool depending on the nozzle size needed. Air brushes might use nozzles in the range 0.5 -1.0mm, small touch-up guns 0.6 - 1.0mm and bigger paint guns 1.2 - 1.6mm.

For a 5" boiler I would be looking at 0.8 - 1.0mm. For the frames or wheels 0.6mm will be ok.

A mini HVLP gun seems to shift more paint than the airbrush with for example a 0.6 nozzle. So the better air brushes, like a Paasche VL with #1 0.5mm to #5 1.0mm nozzles can almost do a boiler. But better would be a cheap HVLP Detail Spray Gun 0.8mm or something like a Finex mini-HVLP gravity gun with changeable 0.6 and 1.0 nozzles. With the bigger nozzle sizes you need 4cfm (100 litres/min) at least and a 50litre tank so your compressor needs uprating.

It is worth buying a decent airbrush with different nozzles, but a basic mini HVLP gun with a couple of nozzles. But your bigger cost will be a compressor, and some filtering in the air supply.

Norm

Edited By norm norton on 23/05/2021 15:18:58

Thread: A Welding Problem - Steel Type?
23/05/2021 14:51:16

Note, Nigel refers to plate material. Lead is added to low carbon (EN1) round bar steel to improve machinability.

Nigel, keep to MIG and CO2. Check you can hear the gas hissing when you pull the trigger, with the power still off frown. Just make lines of weld on top of some 1/8 or 1/4 thick plate and adjust the power to suit the thickness and the wire feed to get a steady 'singing' and no stop start or banging. It is all sensitive to steady wire feed. The feed rollers must grip just so, and the feed tube be clean and nice inside. Well used MIG welders benefit from new rollers and feed tube.

I haven't yet found steel that cannot be MIG welded, but yes leaded bar is not perfect and higher carbon steels might leave cracked welds. Yes, essential to remove any zinc treatment from steel. Easily done by putting it in dilute hydrochloric acid (or another acid) until bubbling stops.

Norm

Edited By norm norton on 23/05/2021 14:54:18

Thread: Harrison L5A tool post mod
06/05/2021 10:15:13

Thanks, that is interesting, and confirms my imprecise and random findings.

While the four-way works nicely on the bigger Harrison, there are several reasons (for me) why the QC seems to suit a small Myford.

Enough toolholders? I have a dozen and I am continually swapping tools in and out of them!

05/05/2021 20:34:31
A refreshing change to find a champion of the indexed four way toolpost as opposed to the pick-off QCTP!

At the end of GHT's description of his tool posts for the Myford he set out the results of a series of tests for repeatability showing a maximum deviation of about four tenths of a thou.

Thank you ! must tell my wife somebody finds me refreshing devil

Was GHT describing a four-tenths deviation for a QCTP or an indexed head?

I have one of the small QCTPs on my Myford S7. It is possible to get slightly better than one thou variation IN DIAMETER ON THE JOB changing tools, but only if the head and holder are scrupulously cleaned (especially if turning brass) and you adopt a repeatable style of dropping the holder in and tightening it. Typical tool swaps are a thou, i.e. half a thou in tool absolute position.

Norm

04/05/2021 10:08:25

Frank,

It is going to be expensive getting a large number of QC tool holders.

I have some twenty tools lined up on a shelf above my Harrison 140, each sitting on their own packing piece, specifically milled for height for that tool (sorry, I realise you don't have a mill). OK, took me a day to do them all but now that's it, and very low cost. That four sided head is a delight to use and quicker to swap between four tools than QC holders. The indexing balls under my tool post work very well and if I rotate from one tool back to my DRO set facing cutter it is typically within a thou of the correct diameter - about the same as QC tool swaps.

Norm

Thread: Bassett-Lowke
15/04/2021 14:02:11

Bemused is a sentiment I would agree with.

I wonder what Mr Bassett-Lowke would make of it?

Thread: Distorted ship's hull steel panels
15/04/2021 10:41:07

Thank you Bill for kindly addressing the points in my ramble.

I will stop my worrying and accept that it is welding distortion, inevitable in large panels tacked to widely spaced frames sad

And the Royal Navy does not waste taxpayers' money making the hull above the waterline look like a thing of beauty crying

13/04/2021 10:09:48

Thank you all for joining the chat. But I still cannot see why, when they build a big Naval ship, the plates (panels?) all appear indented at launch.

Bill kindly explains the welding might pull in the centres, but that seems odd - couldn't they design the ribs to match the planned curvature in all places?

A big ship like a liner with heavy plates has them all rolled to match the curvature; I don't think the same plate distortion is seen. So, are we thinking that the Naval ships are made with much thinner plates, to make a lighter and faster ship, and try as they might they cannot make them neatly curved all over, and have to resort to seven tonnes of epoxy filler?

So why can't thin steel panels be rolled to a correct curve, and welded to the curved bulkheads and ribs, so that it all looks neat? There is something we are not understanding, and that was the whole point of my first question.

My guess is that localised heating and cooling of the skin from the sun leads to expansion that either has to pop in or out, and standard practice says to make them all pop in. I wonder if this is why the same panel distortion is seen in welded locomotive tenders?

But, if the panels are flexing in and out with sun heating, how does the seven tonnes of epoxy stay in shape?

Edited By norm norton on 13/04/2021 10:11:12

Thread: (bicycle) thread identification?
10/04/2021 20:14:25

It is all very well being pedantic and saying that a 55 deg nut cannot/must not be mated to a 60deg bolt, but you are talking about a couple of thou fitting difference and load being on a line contact rather than a full face. Does any one have data on how much less load a thread angle miss match can carry?

But I agree, in principle, cut the right thread angle and do things properly. Does it matter for strength? we need to see some data.

Thread: Distorted ship's hull steel panels
10/04/2021 20:02:15

I always assumed that when you saw a Naval ship with panels on the hull side dented in, it was the arduous sea journeys that had indented the steel plates between their bulkheads and ribs.

But today I saw a film of the launching of HMS Sheffield (later lost in the Falklands) and it had the same indented hull side panels, perhaps 10 feet square, all down the length of the ship.

This got me thinking. If they were welded at the joins would not the cooling cause the panels to be pulled tight? Why are they all indented at the centres by an amount that is very visible in reflected light?

A similar effect can be seen on locomotive tenders that have been welded. Perhaps an effect that should be replicated on scale models?

Any experienced large scale welders able to comment?

Norm.

Thread: WELDING A BEARING
12/03/2021 09:33:53

So a TIG torch run around the bearing outer, with no applied rod, will be as effective as using a stick or MIG?

Thread: Parting 1 1/2 phosphor Bronze
06/02/2021 14:36:04

Well done Martin, glad you have confirmed it, REALLY sharp HSS tool.

Mike, slitting saw, same answer, the teeth will have to be freshly honed, or use a new saw blade.

06/02/2021 10:27:22

Obviously tool height must be right and a strong foundation for the tool, but it depends on what type of PB you have. PB102 flexes under cutting, hence can close in on the tool shank.

The corners of the tool must be absolutely sharp, best to hone an HSS one. I don't like the insert carbide cutters as they are not sharp enough.

Slow speed, with cutting oil dribbled on, it all gets very hot. Same issue with drills. Colphos and SAE660 don't suffer the same problem in my experience.

Thread: Butch - can it come back to life?
18/01/2021 09:38:50

The Butch is a good, sturdy design and several are giving good service in the UK. Ideally, you will strip it down to the last nut and bolt, then rebuild to the standard you want.

The big question is whether the boiler was made to a reasonable standard in the first place, and there is a good chance it was. Over time, there will have been minimal corrosive effect on the copper or silver solder used in its manufacture. Bronze bushes and fittings will be fine, but if any brass was used anywhere that might have become porous from dezincification.

When stripped and plugged with screw in plugs and o-rings, the boiler should be filled with water and hydraulically pumped up to one and a half times its normal working pressure of 90psi. If there are no leaks you are clear to go on to the next stage which is to see how to get it registered and tested with a Canadian authority. I will leave a transatlantic cousin to explain that as I have no idea.

Best wishes

Norm

Edited By norm norton on 18/01/2021 09:48:43

Thread: Coronavirus death stats
17/01/2021 11:43:12
Posted by Steve Pavey on 17/01/2021 11:13:07:

Freedom is the absence of constraint to do whatever you want, provided it does no harm to others.”

A good quotation Steve, and I have the same view that you describe. The problem with the very clear statement above is the definition of harm and quantifying it. For example, "I am harmed by hearing your views"; I might be harmed if you ride that motorcycle"; "Your creation of air pollution is harming me". How many of those do we agree with?

I thought that this forum thread might be a bit of a rant, but pleased to see there are thoughtful expressions from most everyone. Thinking about these things and discussing them is helpful, if done considerately.

As I get older I am more surprised by the extreme and totally illogical views that some poor souls manage to adopt as an obsession. This Q Anon movement is very odd.

 

Edited By norm norton on 17/01/2021 11:44:59

Thread: is there an easy identification test for Nickel and Chromium ?
27/11/2020 15:10:01

Michael

Nickel will readily come off with an electric current and a mild acid bath giving a green/blue solution (reverse of nickel plating). Just start the process to see if the surface suddenly brightens.Chrome will not come off in mild acid.

My experience from stripping chrome and nickel off old parts.

Norm

Edited By norm norton on 27/11/2020 15:10:41

Thread: Strange Word...
14/11/2020 19:28:07

Strangeness might be a personal interpretation of what we see wink

Crossslide is a compounded noun; originally cross slide, then cross-slide but then crossslide might be a compounding too far.

Thread: Help - Harrison 140 lathe
30/10/2020 10:13:13

Lead screw dial will tell you when the metric screw cutting can be re-engaged.

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