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Member postings for Dave Halford

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

Thread: Advice for surface finishing
19/01/2021 20:48:22

Looks like EN3 - use an aluminium insert

Thread: Fast charging anyone?
19/01/2021 11:38:51

Might be the answer for lorries with a high voltage charger

Thread: Chuck fitment to dividing head
19/01/2021 11:30:06

Are we sure this isn't the problem ?

Thread: Benchtop lathe with power cross feed, looking to buy
19/01/2021 11:20:45
Posted by Gazz on 18/01/2021 20:46:46:

Thankyou for the very useful information,

But i am wondering about lathes that use the leadscrew to power the cross slide, the amadeal AMA250 and chester DB10vs use a second rod to power the cross slide... i believe they power the carriage feed too that way? and the lead screw is used just when screw cutting?

If someone was selling a chester craftsman second hand, i'd go for that for sure, but i am thinking if i have to go for new, it'll likely be a slightly smaller lathe,

Lathes powered by the lead screw use a slot cut the length of the screw, they do not use the thread for power transmission.

Thread: Wobbly Lathe - some Advice please
18/01/2021 19:24:00
Posted by Andy_G on 18/01/2021 18:38:12:
Posted by Dave Halford on 18/01/2021 18:10:46:

It looks like you have over tightened the front clamp too much

That also could be the reason for the carriage springing off the bed. (It's not just cranking, as the movement can be seen at the end of the video where the carriage is stationary - 13 seconds on).

Agreed, he's got the rear of the carriage waving about in fresh air, it's bound to spring.

Thread: Model boiler safety calculations
18/01/2021 19:14:24

That sounds rather like an 'I don't want to do the job'. He knows very well you won't be able to provide the calc's.

Thread: Chuck fitment to dividing head
18/01/2021 19:09:46
Posted by Matt Stevens 1 on 18/01/2021 17:58:08:

So i have a Southbend 9" lathe which has a spindle thread of 1.5" x 8 TPI. I have 3 and 4 jaw chucks for it.

Recently i got a dividing head which also has theoretically the same thread. The problem is that the chucks do not screw onto the dividing head?! They go tight within a quarter turn or so....

Any ideas? It would be a pain to have to machine new backing plates and keep switching them between chucks etc.

I've heard that one too. My Rockwell Delta 10" takes Boxford thread backplates, but not my BS0 dividing head backplate

Thread: Wobbly Lathe - some Advice please
18/01/2021 18:10:46

Was the lathe OK before you moved?

The carriage should stay flat on the bed only if the the weight of the rear part is greater than that of the front apron.

The fact that the front bobs up when you wind it on the rack is hopefully you changing the pressure on the hand wheel as you wind it.

It looks like you have over tightened the front clamp too much as well. Loosen it off till the rear carriage bearing surface can return to the bed. If you then lean hard on the centre of the carriage with your left hand where the cutting tool goes you should be able wind the carriage with your right hand back and forth without it rattling about.

I think the plate fell off in the van when you moved.

Thread: Choice of Flux for Soldering Fine Mesh
17/01/2021 18:54:28

Any solder intended for electrical work, normally resin cored.

Stay away from anything aimed at the plumbing market, the modern stuff for non lead solder claims to be non corrosive, but the fumes cause rust.

If you tin both pieces, mesh and steel first then you can avoid using flux to join them

Thread: Silver Soldering Materials
16/01/2021 17:30:59

There's one way you can find out, if you can get the job hot enough to get the solder to flow properly, then it's big enough. Otherwise it's not and you either need either a turbo / swirl burner or a bigger torch and remote bottle.

Personally I've always found steel much harder to silver solder than copper

Thread: Disposable Gas Bottles
16/01/2021 17:15:40
Posted by Speedy Builder5 on 16/01/2021 15:54:35:

Renting bottles is expensive, I use about 2 bottles of 2.2l per year at £35 per bottle disposable £70 per year.

Renting a 10 litre bottle is about £90/ year plus £65 for the gas - so gas for 2 years is about £245.

Something has recently changed making MIG quite expensive !!

Bottles are available from Poland - cheap, can't re-fill in France, UK, Lux,Germany etc !! also use non European gauges !! Have a look on e-bay for cheaper gas !

Bob

I don't pay rent Same as you don't pay rent for Calor

Edited By Dave Halford on 16/01/2021 17:17:39

16/01/2021 15:12:06
Posted by noel shelley on 16/01/2021 14:17:41:

IF the original contents of the bottle were non inflammable then make ABSOLUTLEY sure the bottle is empty before you drill a small hole and then cut in half. For flamable content, empty completely, remove the valve gear if possible before filling with water and cut off the top. For larger gas bottles, as before but a good plan is to pour a quantity of hot water in to drive off any oily heavy fractions that may remain, then cut off the top whilst still brim full of water.

Larger gas bottles still belong to Calor or Bottogas etc our dump stores them for return to the owners

16/01/2021 15:09:56

Speedy,

Have you no car paint supply warehouse near you that stocks refillables? Similar to Calor you rent the cylinder, then just pay for refills of Co2 or argon mix. Unlike BOC with their yearly expensive commercial only charge.

There's one in Birmingham does this, I tend to use a 10lb bottle every 3 or 4 years and they don't care.

Sounds like you have already spent enough to buy at least 3 cylinders.

Thread: Myford ML10 main screw skating
15/01/2021 17:30:06

Bob may need to buy 2 of the 121 upper shaft parts and remove the gear from one them and ream to produce a running fit for the lower shaft.

Thinking about making a gear, the DP would be whatever fitted into an 8tpi thread, but as the thread is used as a rack would you use a rack cutter or 19 is it? to match the tooth count.

It can't be involute can it?

Edited By Dave Halford on 15/01/2021 17:35:18

Edited By Dave Halford on 15/01/2021 17:36:20

Thread: Standards of Electrical Wiring
14/01/2021 19:22:49

I quite like this one, and I have seen worse from the 90's. When his eyes light up it's the right circuit.

iragi.jpg

The last one just scares me.

atalayar_sistema el?ctrico en irak 2.jpg

Edited By Dave Halford on 14/01/2021 19:23:44

Edited By Dave Halford on 14/01/2021 19:28:00

Edited By Dave Halford on 14/01/2021 19:30:30

Thread: Coronavirus death stats
14/01/2021 14:08:00
Posted by Howard Lewis on 14/01/2021 13:18:21:

I am sceptical about some of the figures being bandied about.

My Physics master taught us to look at figures or statements and to analyse them

Some seemed to be based on the prognostications where previous forecasts have proved to be anything but accurate.

There seems to be a lack of clear or logical thought about the numbers. Possibly, as already said, those looking bat them do not understand them, and do not know how to process them.

Very few times are the figures translated into percentages.

"79,000 deaths" Sad news for very very many, but less than 0.15% of a population of 67,000,000.

Infection rates of "382 per 1000,000" Simple arithmetic says that represents 0.382%, a much less frightening figure.

"15,000" positive tests to day" Out of how many tests? 15,000, or 300,000? 100% or 5% infections?

And no one knows how many of those positives were false, from people showing no symptoms. Or if they IF do, we are not being told.

Are we being told what "they" want us know? Why? Not to frighten the horses, or knowledge is power, or even some other hidden agenda?

We are dealing with politicians. Remember Harold Wilson devaluing the pound "Won't affect the pound in your pocket" Until you take it out and spend it.

Gordon Brown advocating "prudence" while borrowing like it was becoming extinct

John Selwyn Gummer "When I say safe, I don't necessarily mean safe"

Not being political, but don't take everything coming from Westmister on face value.

Howard

Edited By Howard Lewis on 14/01/2021 13:19:30

What ever makes you feel better.

Making the 100,000 figure a million doesn't help

Thread: Myford ML7 mainshaft
13/01/2021 10:08:21
Posted by Brian Wood on 06/07/2018 18:01:55:
Posted by Hopper on 06/07/2018 10:14:41:
...I think heat damage to the CPU is taking place, not my usual performance

Brian

Increase the flow of amber cooling fluid. It's what we do here in the tropics.

Would that be the ubiquitous Amber Nectar that can be tolerated in pretty much any quantity by the suspension on pick-up trucks? It is the bottle of sherry that is so damaging and it is not a cooling drink under these conditions

Brian

Brian,

I'm betting thats one advert that didn't air Down Under.

Thread: Recommended suppliers
12/01/2021 20:56:40

Xmas card post marked Dec4th received Dec 24th

Thread: Myford ml7 about to buy
12/01/2021 16:43:04
Posted by Simon Kimsey on 12/01/2021 15:45:54:

Thanks for all your replys very helpful,I'm still trying to suss pic upload !)),Dave halford that's spooky have you seen the lathe that's a pretty accurate description!

It was an optimistic assumption smiley

Thread: Boring bar size ?
12/01/2021 15:50:18
Posted by Jeff Austin 1 on 12/01/2021 06:18:43:

Hi,

I am not sure what metal the carbs are made from but they are pretty sophisticated carbs and I think they are aluminium,

Thanks in anticipation, Jeff

Might be mostly Zinc, as in Mazak or Mazac used in every car carb in the 60's and 70's

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