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Post by goldstar31 on Oct 6, 2011 8:56:53 GMT
I agree with Tel but so far, there has been no mention of 'angling off' D Bits or anything whatsoever to extend seating. One might as well stick with the traditional 118 degrees of a twist drill and avoid the 'Please Sir, how does one make a D Bit and how does one angle it?' I looked back and there was even correspondence to ask 'What is a D Bit?' With my ususual acrid comments, I didn't want to wander off further and get to the daft 'Please Sir, how do you temper?'
Someone, and I don't care if it is me. has to get people back on the right track-- and do what every half baked apprentice has been doing since Tudor times when the toy was a cup and ball.
So apologies but this was the Ouzle Woozle bird- and we all know where it got. Up its own FooFoo valve!
Retires to a tin hat-- and my old gas mask which has a valve!!!!!!!!!!!!!!
Norm
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Post by Tel on Oct 6, 2011 9:21:16 GMT
Ah well, just for everyone's edification and enlightenment, I will re-post my (not to scale) schematic for a seat cutting 'D' bit ![](http://img.photobucket.com/albums/v332/laneranger/dbit.jpg)
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Post by Jim on Oct 6, 2011 9:26:41 GMT
Like Tel, I've made all my clacks and pumps using using ball valves with dimensions derived from data supplied by Everet Clem (see link below). They are not high tech and work without any trouble. www.livesteam.org/CheckValves/index.htmlJim
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russell
Statesman
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Chain driven
Posts: 762
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Post by russell on Oct 6, 2011 9:52:06 GMT
The only time I've had a problem with Clacks sticking I discovered that a well known supplier had sent me "stainless steel" balls, half of which were not stainless and rusted!
Russell.
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Post by chris vine on Oct 6, 2011 11:01:51 GMT
Back to the original question:
Hi Phil, I just wonder how perfect you are trying to make them??
If you are trying to suck against the valve and stick it to your tongue and hope it doesn't fall off, then maybe you are being to critical.
I find that the suck/tongue test is almost impossible to achieve. it maybe that what you have made is perfectly good for its purpose.
Helpfully (or not) Chris.
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Post by goldstar31 on Oct 6, 2011 11:06:14 GMT
Of course, there is the wonderful special tool of the tiniest light bulb solderd to a piece of wiring flex and a battery.
It's an interesting tool. Then there is the bit of carbon paper. And there is the classic burette with oil in it. I've used them all but the best was the domestic vacuum cleaner in the sub aqua demand valve factory. They painted it so that the peasants thought that this was a special bit of kit. Then there is the gas flowing of-- but I digress
Norm
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Post by chris vine on Oct 6, 2011 13:13:14 GMT
Norman,
where have you digressed to? You have completely lost me.........
C
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Post by goldstar31 on Oct 6, 2011 15:42:35 GMT
Ah! Chris? These are/were some of my rather odd tools. The one with the light is one which can be inserted to check were a fitting -does not fit. Actually, I made it up to check clarinet and saxophone pads which do not seat but I found a lot of other uses. The carbon paper one is one stolen from my wife and daughter to check on 'bites' but like all good simple ideas, I borrowed. The oil in the burette is one which is beloved by those who work with- would you credit it- valves on car and motor cycle engines . It came from a Mini Cooper book by Clive Trickey.
The vacuum cleaner( in a pleasing shade of cream paint) was from Submarine Products of Hexham. As the name suggests, they didn't muck about with 80psi by stepped down from 3200psi to air at atmospheric pressure-- and demand valves were nothing more than refined valves from butane bottle regulators( or valves, if you must) The humble vacuum checked the flows
Ironically, diving does demand(?) that one is blacked out and completely lost by filling a diving mask up, flinging you into the deep end and seeing what your reactions are.
Did the poster merely try to 'wind us all up?'. Remember, an old, ill educated generation of people had the answer(s)
Sorry for the long winded reply but it begged a lot of questions.
My regards
Norm
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