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Member postings for Bill Davies 2

Here is a list of all the postings Bill Davies 2 has made in our forums. Click on a thread name to jump to the thread.

Thread: Running needle rollers between cast iron plates
17/01/2022 18:53:05

I have read that some (all?) surface and cylindrical grinding machines have steel tape to take the surface load. I can't think of an engineering application that has hardened steel rollers in contact with hardened rollers, but I would suggest a larger diameter might reduce the effects that Michael has highlighted.

Bill

Thread: Tea cup scale
30/12/2021 21:38:41

And if you use CIF it will adequately clean the tea stain, but produce fine scratches on the cup and spoon that then increase the rate of brown stain depositied. Contains limstone dust as a 'mild' abrasive.

Bill

Thread: To harden or not to harden that is the Question
26/12/2021 15:42:32

Personally, Dell, I would keep them soft. If they have to deform slightly, say, due to a speck of swarf caught between the tee nut and slot, better that than a stress concentration that may break the top of the slot.

Bill

Thread: Can you identify these hand tools?
22/12/2021 23:51:22

It seems a common brand, James, I have one, too.

Thread: Laminated Info
01/12/2021 19:53:25

The polypockets with a fine 'bobbly' surface work with laser printed/photocopied sheets. The smooth ones, in my experience, are the problem.

Bill

Thread: Boxford ?
15/10/2021 13:14:37

Hi, John.

Many years since I used one, however, engage the middle 'three position' lever in either of the outer positions? Then carefull tighten the star-shaped knob to engage the friction clutch. You should then get movement.

You can only operate one axis at a time.

Bill

Thread: Plastic Chuck
13/10/2021 22:44:29

And I've been somewhat dubious about those diecast zinc chucks (google zinc lathe chuck). But they are cheap - is that their only virtue?

Bill

Thread: Accuracy of Hand Drilled holes
06/10/2021 12:21:05

I make no claim for my ability to achieve such accuracy, but my instructor taught us to mark out perpendicular lines, pick up intersections and lightly mark with a sharp prick punch (60° centre punch), then using an eyeglass, 'nudging' the position until properly located, then apply a heavier tap. We used a small centre drill and opened up and reamed in the usual way. He claimed, with care, 0.005".

I think Chapman's first volume of Workshop Technology also claims five thou. I've put my copies somewhere safe, and can't find them. There is a set of all three on Ebay for £27.99.

Machine Tool Operation ( [US textbooks] Burghardt, etc., 1953, vol 1) claims it is possible to set external calipers 'easily' to within 0.002-3" against an engineer's rules. In those days, they were accurately ruled and deeply etched.

By my time, vernier height gauges were universally used, and we had mills and jig boring machines for accurate work.

Bill

Thread: Small Hydraulic Press Tools
03/10/2021 11:09:13

Michael, I have also been thinking about a press; I bought a 2 ton jack just before lockdown.

The option you linked has surprisingly small 1/4 inch screws, in shear and in plywood, but clearly it works for the example shown. I wonder what force was necessary for the bends shown.

I have seen examples that use large diameter studding in tension, which avoids welding, and I will probably use that method. I want to try pressing small sheet metal parts - not planning on coining, which requires much higher pressures!

Bill

Thread: Garador door closer
14/09/2021 14:30:54

This guy has an M2 (same type or compatible brand?) and code 4 indicates overload, sugessting some lube required/corrosion or whatever, ditto pgk's comments.

Garage door controller

Compatible brands

Bill

Thread: UK fires up old coal power plant as gas prices soar
06/09/2021 23:11:10

Fail to plan, plan to fail ...

Thread: Anyone know what this is
31/07/2021 23:03:16

Is it a core drill? More rigid than a two fluted drill, used instead on removing material from a cast hole. But I haven't seen one with cutting edges to the centre. But no, the size is far too small.

Bill

 

Edited By Bill Davies 2 on 31/07/2021 23:04:43

Thread: Leveling machines
26/07/2021 14:10:52

Hopefully not a nice thick pound coin, Michael!

Bill

Thread: Myford Gear Spacers
26/07/2021 14:09:17

And having worked in a school in recent years, the Physics is not taught completely using SI units, centimetre units are used for calculations until A-level, when sizes are converted into metres. Other units of measurement comply.

Bill

26/07/2021 14:05:54

I left school in 1968, to start an apprenticeship. Whilst everything in the factory was Imperial units, the apprentice instructor taught us about unified, which he expected to replace Whitworth in a short while. At college, perhaps from the first year, but certainly soon after, we were initally taught Imperial and Metric units, and then later Metric only.

My "Science for Mechanical Technicians Book 1" (M G Page), revised in 1970, uses Metric units throughout, ditto the Maths book by the same author. Metrication was announced by the Government in 1966.

But back to the OP, thanks for the spacer idea, it will be useful for my old lathe.

Bill

Thread: Wall Chart
25/07/2021 12:47:34

Gary, I had 'access denied' when trying to download your chart. Should I request access, or can you make it public?

Thanks,

Bill

Thread: Best soldering iron for electronics
19/07/2021 12:06:08

Another long-term Antex user. As a school technician I replaced the awful cheap irons with Antex, with silicon leads. These are more flexible in colder weather, and resistant to being burned by pupils.

I agree that you need different powers for different job, I expect a temp controlled iron allows for different jobs, but I've never used one.

Bill

Thread: 6 inch bench grinder
17/07/2021 20:55:45

It seems that it comes in two colours:

Black and green silicon carbide

The Wikipedia article mentions multiple colours, sometimes due to impurities. My recollection from long ago was that the wheels I used in industry were always green. This was for brazed carbide cutting tools, before inserts were common or perhaps available.

Bill

Thread: Getting my Britannia No.13 into use
16/07/2021 22:18:07

Hi, Tony, and welcome. I have what I think is a Britannia No. 14. There is a large ball bearing (a ball, not a ball race) which takes the axial load. I don't know whether it is an original feature. It's under a load of 'stuff' (a future project...) but I can check the details if it helps. Mine would have been a treadle lathe but someone (short?) cut the bottoms of the legs off, so it sits on wooden blocks to bring it up to a suitable height - I'm 5'10''.

Bill

Thread: Template for Cutter Teeth Indexing Table : Patent
16/07/2021 12:45:13

Especially as there were, at that time, much better ways of measuring pitch and concentricity errors in gears.

Bill

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