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Member postings for Les Jones 1

Here is a list of all the postings Les Jones 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Gear wheels
04/12/2009 20:33:58
Hi Bill,
              I recently saw a picture on the web of some home made slip rolls that used a crank to link the rollers. (Like between the wheels of  a steam locomotive. ) At first I thought it was a good idea but then thought that when the cranks and connecting links were in line it would not work well. Later I thought that if the other ends of the rolls were linked in the same way but with these cranks set 90 degrees from the first set it would solve the problem. I can not remember where on the web I saw the picture.
Something to think about.
Les.
Thread: failing spark plugs
19/11/2009 20:34:32
Hi Steve,
                 If the problem is caused by the plug and not the previous suggestions then I think oil is getting past the rings into the cylinder or the mixture is very rich. Is the plug black with a carbon build up? If it has a layer of carbon on the insulator this will short out the spark. If the mixture is correct the plug should be brown in colour. Black indicates a rich mixture, grey indicates a weak mixture. Try sandblasting one of the failing plugs to remove any carbon build up and see if it then works.
Les.
Thread: Cutting male threads
13/11/2009 09:51:01
Hi ???,
               You are correct that a 10 mm thread will be cut on a 10 mm bar.
Here is a link to BA thread dimensions.
I Googled "ba thread dimensions" to get this.
Les.
 
Thread: Boiler making hearth
08/11/2009 09:31:03
Hi Tony,
                 Here is another possibility 
They have insulating fire bricks and high temperature insulating blanket. The problem buying this sort of thing mail order is the cost of postage. I plan to use them for materials to make a small furnace for melting brass and aluminium. I will be able to collect from them as they are only about 15 miles away from me. (They are in Liverpool)
Les.
Thread: ELECTRONICS
05/10/2009 18:37:31
Hi Wychwar,
                        I have put a design for a four digit tachometer that uses one pulse per revolution on the "Yahoo X_Series _Mills forum" in the file section.
It works by measuring the time  of one or more revolutions and calculating the speed from that. At slow very slow speeds it only times one revolution. (So the display is updated at a reasonable rate.) At higher speeds it times a number of revolutions to average out the speed over about a one second period.
I hope this will meet your reqirements.
Les.
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