Member postings for ChrisLH

Has anybody mentioned the runout between the bore and OD of the individual collets - there's bound to be some? I've never attempted to measure it on my ER 25 set because if I have a job where concentricity is crucial I either turn between centres or do my utmost to arrange for the relevant diameters to be turned at the same setting.

Comes up for me too and my connection is rather slow over GPO lines.

Bizzarely ISO metric pipe threads are actually BSP sizes and are specified as such. So the thread in question is probably 1/2 inch BSP exactly (0.825 inch dia.[20.95 mm dia ] x 14 tpi [1.814 mm] pitch).

And you had to more or less destroy the skeps to get at the honey.

This all reminds me of a curiosity of our previous house. The practical men who built its roof knew very well what purlins and rafters were and made sure the former was adequate; 8x4. It's usual for the purlin to be supported by end walls or other structures and for it to support the rafters at mid span. Not so in our case. One end of one of our purlins was supported by a brick wall but the other end only by fresh air. Effectively the usual situation reversed, rafters supporting purlin. The latter could have apparently been omitted with no detriment. Fortunately nothing fell down during our occupancy thanks to a degree of redundancy in the structure.

It's worth checking that the tumbler stud gear (the one concentric with the tumbler train output gear) has 24 teeth.

If all else fails find a friend with a lathe, you'll be able to have the exact sizes you need then.

Nevertheless an ingenious piece of mechanism, see "Japan USA Precision Tools" website for cut away drawings and parts list. It took me about half an hour to work out what was going on inside. Production of new units and spare parts was due to re-start last month at JUPT in California. Due to lack of need, cash and a suitable host machine I won't be buying one this year ($3000 a shot !).

I've had NHS hearing aids for at least 10 years. NHS in my area take the initiative and invite you in for a check-up every 2 years. At my last check-up I got a new pair of aids (Oticon, Danish) which are excellent. They are free as are the batteries.

Mike Cox wrote an illuminating article on the subject in MEW 241, page 24 et sequ. A read may help.

As an aside, in the film they mention that hydrogen has an effect on the exhaust note if I interpreted the transatlantic accent correctly (increasing the frequency ?) Is this related in any way to the squeaky effect on the human voice of inhaling helium (just for fun) ?

Years ago I was paid to look into hydrogen powered aircraft (at a very basic level). What came out was that to achieve equivalent long range to existing aircraft the fuselage needed to be doubled in diameter to contain the liquified hydrogen. No room fo passengers and no account taken of the additional weight for the extra fat fuselage and its ncessarily robust construction.

The point I'm making is that, if we just look at earthbound vehicles, hydrogen, even if pressurised to the point of liquifaction, requires significantly more space and structure than current fuels to contain it.

I was in a similar position as treasurer of a gardeing club banking at Barclays. I tried to comply with the money laundering requirements 4 or 5 years ago but had to give up in the end as whatever I did we could not meet their demands. Relief came in the form of advice from a nameless employee to just leave it and put up with being investigated if the bank found it necessary. We have nothing to hide so that's OK. Meanwhile Barclays have closed their local branch so half a day's effort to use their nearest branch. I use the Post Office (another bunch of crooks who put a lot of employees in prison for crimes they did not commit) for transactions now so why do we bank at Barclays ? I'd change it if I could be bothered.

Failed SOD's safety test, you can put it on back to front and get it 90 degrees out of position !

Alternative to the attractive spark eroded hole.

Drill the boss 14.4 diameter thru from the back then end mil 25 diameter from the front but not right thru, say 15 deep (assuming boss is about 25 thick). Make a plug 25 dia x 15 thick with keyway 12 wide. Braze in place. Minor changes to the spindle could make incorrect assembly impossible as long as the spindles have not already been made. Bush would be robust I believe.

If a rectangular hole 12 x 13.2 was acceptable then rotary broaching in, say, a 13.5 diameter drilled hole could work. Theoretically the hole would have to be offset slightly to be on centre but hardly likely to matter for so small amount in a manual lever.

Sets of letter and number stamps.

Since we are talikng valve gear, has any one identified the valve gear on the Brussels tram engine which appeared in this week's episode of the TV show which attempts to reach the Scottish border by steam power ? The gear appears to be a bit like Walschaerts (has a combination lever) but the details at the expansion link end are not really visible and may therefore have a cunning twist.

I also have DW mill but don't recognise the flat faced knob you describe. Maybe a mod. done by the original builder. A photo could help.

Linre the inside of the enclosure with egg boxes ? Probably not practical but may spark off other ideas.

A front mounted parting tool "digs in" when an increased downward load causes a flexural rotation of its supporting structure towards the work

A rear mounted tool sees an upward load and "digs out" in similar circumstances thus avoiding a jam.