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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: Yet another 'which mill shall I buy'
08/11/2019 19:58:59

Iain, I have a Warco Geared Head Universal, which weighs 300kg or so. It is supported on a wooden stand made of pine approx 40 x 90 mm, with same sized timbers into recesses or dados in the legs, held together with M10 coach bolts. It wobbles slightly but supports the mill very well.

I ordered a metal stand at the time which was out of stock, so it arrived later. In the meantime, I built the wooden stand, which I prefer. It is taller and takes up less room. What to do with the metal stand?

Note that this stand is not a bench so no flexing of horizontal beams. But take comfort, Iain, from the scary-sounding 300 kg, as it is the same as 3 reasonably built chaps standing on a bench or table.


Thread: How does someone gauge the power of a DC or AC motor?
07/11/2019 23:16:04

I think John has the right idea. But I've crunched some numbers, so I've overthought it already.

I note that 110mm diamond tile saws use 450-500W motors. The disc speeds are approaching 15,000RPM (probably busting speed, rather than cutting speed). Allowing significant losses, I assume the power at the disc is 300W. Converting to Imperial units, which I assume are more familair to most people here, we have 0.4HP available.

Unless I've cocked up (it's late) I get about 0.14 ft-lbf torque, or 1.28 lbf at the periphery of the grinding disc. A 50mm disc would have about twice that force at the periphery. I don't know Chris' application, but cutting ceramic tiles must absorb quite a lot of power. I'm not sure why Chris chooses 400 RPM.

I hope this offers some useful info,


Edited By Bill Davies 2 on 07/11/2019 23:16:31

07/11/2019 21:43:07

I suggest you look at similar commericial products, with similar dimensions and speeds. The free running speed is not the same that for as maximum power, which is 50% of that speed. 400 RPM suggests some kind of gearing, it is very low for AC and DC motors unless a powerful motor is used at much lower than its rated speed.


Thread: ‘Go- No Go’ or something more?
06/11/2019 14:30:50

It is referred to as a 'snap' gauge. Still used, just google. In my experience, generally used on the shop floor, for cylindrical features, actual measurements made by various other types of gauging in the inspection department. It looks like a pretty old example, given the narrowness of the gauging pins, unless they have been cut down to fit into a gap or slot.

Thread: Buying a Propane Torch
28/10/2019 23:12:29

And another happy purchase from Hamilton, the 7.7kw burner set with regulator for UK standard propane cylinder, as mentioned by Bill and 34046.


Thread: What is this thread called these days? 3/4"-16 SAE
22/10/2019 18:35:54

I was taught that UNC and UNF were replacing (or had replaced) BSW and BSF in the British motor industry, and would be adopted by the rest of the mechanical engineering industries. That was in 1968.

It was a common standard agreed between USA, UK and Canada after the Second World War. Wikipedia says that the system was adopted in 1948.

Wikipedia - Unified threads adopted

Thread: angle plate
18/10/2019 20:09:33

Unfortunately, Celso Ari, the video is private.


Thread: Axminster SU1 Horizontal Mill
15/10/2019 16:52:30

Running what seems a bit fast, but cutting and not stalling:

Thread: Question from a customer
06/10/2019 23:59:49

The submarine has increasing external pressure due to depth, but the internal pressure won't increase very much, as it depends on the internal volume, which will reduce slightly. The original poster's question regarded a reduction in internal pressure, caused by drawing in water and the condensing of steam - the principle of atmospheric engines, such as Newcomen's.

Thread: What are members thoughts on Gap Bed lathes ?
03/10/2019 23:25:53

That seems an abuse of a nice machine, Neil.

Mike, some people have made raising blocks for the headtock and toolpost, which would be easier on a flatbed lathe than one with vees.

Here's an example on a small lathe:

Example of raising blocks


Thread: What is it
03/10/2019 16:20:54

Well, neglecting the small boring head, the second one looks like it could be a cutter grinder attachment. The hex brass piece and the rod through it may be part of the spring-loaded blade for indexing off the cutter, rather than using fixed division plates. For example, if the flutes were not evenly distributed, as in some anti-chatter reamers. When I sharpened cutters, this was the method used, both on new ones being ground for the first time, and for subsequent re-sharpening.

Thread: What are members thoughts on Gap Bed lathes ?
03/10/2019 16:05:53

And if a gap bed lathe is chosen, ensure it has a low enough speed. A geared head might be better due to the torque amplification, but I have no experience of variable speed drives (apart from my c300 minilathe).


Thread: Whitesmiths Shop
30/09/2019 15:05:00

'Whitesmith' also referred (confusingly) to craftsmen who finishes (e.g. polished) ferrous metals.

It's a bit like the confusion caused by the recent naming of silver solder, which seems to be the term for lead free soft solders (containing silver, not just the tin and copper variety), as against our familiar hard silver solder.

Thread: M&W rules now better...
26/09/2019 18:37:16

I always liked the design that Sperry shows. I think it was an NPL (National Physical Laboratory) design. Much easier on the eyes. I had a boxwood rule with that design, but it has disappeared somewhere over the years.

Thread: Alternative metal sources?
23/09/2019 21:39:35


You may be able to anneal HSS, but can you re-harden and temper it? I think I would struggle to do that in the home workshop. - Oop, apologies, misread your comment.


Edited By Bill Davies 2 on 23/09/2019 21:53:04

Thread: Internal Fire Museum of Power
22/09/2019 21:59:34

My wife and I visited the Internal Fire museum today, which we also recommend for a visit. The weather forecast was rain, but it was pretty dry and we had some sun throughout the afternoon and evening. I have been several times before, each separated by several years, and each time they have more engines on display. Many of the large oil/diesel engines were running.

The museum now has a building for steam engines (perhaps they should now change the name of the museum), which was running on steam today. Worth checking what will be running if you plan a visit. I have previosly found the volunteers very keen to start an engine when not much is running.

Other items of interest include a shed with working telephone exchanges (Strowger, I think; uniselector switches), plus marine and amateur radio equipment.

Now, what to do in West Wales with the dire weather forecast for the rest of the week?


Thread: Stuck oil filter
22/09/2019 16:09:53

I don't know about home mechanics, my son, an apprentice-trained mechanic for a main dealership, got sick to death with working on electrics in tiny spaces, and the manufacturing shaving a fraction of a penny off the price of a washer. He's now a tree feller, working out in the open air, perhaps less financially rewarded but far happier.

Thread: TPH machine tools Essex
22/09/2019 15:52:28


If it's the same firm, the Companies House website show it as wound up:

One of the directors has an address in Wickford, although (potentially) different from the one above:


Thread: Fiducial lines on a Zeiss Microscope Eyepiece
20/09/2019 17:50:40

Thanks, Michael, you're right. I understood that but expressed myself poorly. And I think Ian is right (and Neil's earlier comment) about IR. That and solarisation was popular at the time.


20/09/2019 11:20:04

I had a camera bought in the 70s with an index line for UV. Outdoor UV photography was popular around that time, for the interesting effects it gave, so perhaps for that purpose. However, I don't recall the two index lines being very far apart, but that would depend on the fineness of the eyepiece's thread. In any case, this adjustment isn't for focussing purposes (that's the rack and pinion's job), so I've nothing to the discussion.

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