Member postings for Bill Davies 2

I've looked for manuals, but not found anything. It looks as thought the handle in photos 2 and 4 should allow a plunger to engage with the holes or slots in the indexing ring. The screw on top of the boss presumably locks it in either the 'in' or 'out' position, if required. It looks as though you can set dead stops for some other angle. However, I've never seen one in the flesh.

Bill

Colin, it looks similar to this:

Indexing head

Bill

William, can you attach a thicker plate, perhaps in addition to the existing one? Some mastic between the two plates would help to dampen any vibration.

Bill

I'm sure many will find Keith Hale's brazing article interesting. I recently (last week) purchased his book from the CuP Alloy website, which I recommend.

CuP Alloys home page

The table on page 35 contains a typo; the burner 7291 (supplied with one of the Sievert blowtorch sets, i.e., the professional torch kit) outputs 7.7kW at 2 bar, and 14 kW at 4 bar - it is shown in the next columnm attached to the front of the 600 grams per hour at 2 bar.

Some of the gas usage data for other burners slightly differs from his book (p.53), a typo or perhaps revised downwards with more recent burners, but not by a significant amount. This is not to criticise the article in any way.

As ever, no association with CuP, just a happy customer.

Bill

Looks like the (expensive brass) work support of a model arbour press.

Bill

Drill diameter gauge?

It does; grinding and cut-off discs. As I understand it abrasive wheels for angle grinders are made using the same technologies as those on other grinding machines. Since we use a variety of types in our workshops, I thought useful to draw attention to the fact that only certain types suffer from a relatively short lifespace, used or unused.

Bill

It is the resinoid wheels being discussed:

https://www.nortonabrasives.com/en-us/resources/expertise/shelf-life-grinding-wheels

The vitrified bonds seem to have an indefinite life. In my first engineering work, formed wheels Al. oxide wheels were kept for the next time a job came in, which might be years. They certainly don't mind coolant pouring over themselves.

I used to give mounting of grinding wheel training earlier in my life. When I moved on to a new employer, this was not accepted and I had to receive training. Later, working in a college, I was told I needed training (just to remount exisiting wheels on a cylndrical grinder and a surface grinder), but there was no money for this, so the machines became unused. There seemed to be no concern for replacing wheels on the offhand grinders, though. H&S is important, but those overseeing it seem to often have extremely firm views.

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.

Bill

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,

Bill

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

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.

Bill

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.

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

Bill

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

Unfortunately, Celso Ari, the video is private.

Bill

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

https://www.youtube.com/watch?v=CLHWeIOeYfk

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.

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

Bill

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.

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).

Bill