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Member postings for Nicholas Farr

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

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Thread: Rulers - my pet peeve
07/01/2011 20:06:52
Hi Neil, I hope you are going to maintain them all at their specified accuracy temperatures during your experiment..
 
I was checking a couple of 2"-3" mics last night and just handling the 2" and 3" standards made a difference of 0.0005". I had to get them all up to my handling temp before I got consistant readings.
 
Regards Nick.

Edited By Nicholas Farr on 07/01/2011 20:08:22

Thread: Using Butane
07/01/2011 19:40:49
Hi, some usefull info may be found at;
 
www.calor.co.uk/customer-services/faqs/the-different.../butane/
 
Butane boils at 0.5 degrees C  and has a natural pressure of about 2 bar and like propane depends upon thermal energy passing through the cylinder wall for the liquid to boil. In cold ambient surroundings there is likely to be a sortfall in this energy to substain continuos use.
 
It is worth looking at the safe use of Butane heaters. there is a PDF on the above website.
 
Regards Nick.
 
P.S. the above website doesn't seem to work directly. but if you click the google box, its under the heading Butane cylinders- Calor Gas
 
Edited By Nicholas Farr on 07/01/2011 19:41:38

Edited By Nicholas Farr on 07/01/2011 19:49:34

Thread: A 'Monkey' triple expansion engine
04/01/2011 21:21:03
Hi Ramon, I don't know anything about these types of engines, but just a thought, if it has a wider flywheel than you might expect, could it be possible that it is hollow to keep the weight.down.
 
Regards Nick.
Thread: Building a Stuart 10V engine
04/01/2011 13:19:48
Hi, yes I'd say they are still a bit warm for copying, but I should imagine they are still available from MyHobby Store.
 
Regards Nick.

Edited By Nicholas Farr on 04/01/2011 13:37:02

Thread: Which Cutter Grinder?
03/01/2011 15:28:39
Hi Tony, I do agree, however it was a sugestion on ones finance more than anything.
 
Regards Nick.
03/01/2011 14:55:33
Hi Ray, you can always build one of the simpler ones to get your lathe tools sharp and gain a bit more practice in the process and then build the Quorn or Stent and then finally sell the first one you make on the ole fleebay.
 
Regards Nick.
Thread: New Year's Resolutions
03/01/2011 14:13:26
Hi, I tend to agree wil kwil, jigs and fixtures are usually dedicated to a specific job. Often they are kinda of rough-n-ready, as making them is time consuming, and in industry time is money.
 
Maybe a few examples could be shown for some simple jobs to show the techniques, but they are really something that you make up as you go along, and to your own way of working.
 
Regards Nick.
Thread: Polishing cast iron
03/01/2011 12:26:17
Hi Duncan, fine grade wet-n-dry will bring cast to a shine, and then finish with a metal polish.
 
Regards Nick.

Edited By Nicholas Farr on 03/01/2011 12:26:54

Thread: Machining Between Centres
03/01/2011 12:18:50
Hi Nornan, Should be easy enough, my Hobbymat only has a bore of no more than 11mm, but that has a 2MT in the headstock..
 
Regards Nick.

Edited By Nicholas Farr on 03/01/2011 12:19:12

03/01/2011 12:08:38
Hi Keith, is it not possible to make a simple drive plate out of, say a disc of 6mm plate and fix it where your face plate goes with a hole big enough for the centre and a hole at suitable distance for the drive dog pin. After all it doesn't have to run true like the faceplate.  Like Ady says you can always turn the centre, to accomadate any fixing screws.
 
Regards Nick.

Edited By Nicholas Farr on 03/01/2011 12:20:25

Edited By Nicholas Farr on 03/01/2011 12:20:56

Thread: Anything About Acetylene
01/01/2011 11:42:22
Hi,
   CoalBurner, you've mention no contact with brass, is this a typo, as the regulators, flashback arresters, pipe fittings, and tourch bodies are brass.
 
   Ian, full or cylinders with equal amounts in, on a manifold sounds logical, as I believe the cylinders have to be refilled at a controlled rate to allow time for the acetylene to desolve into the acetone.
 
   Jeff, your mileage sounds close to mine, I started in 1968.
 
Regards Nick.
Thread: Using Butane
01/01/2011 00:51:26
Hi Peter,  I had one many years ago where I once lived that didn't have central heating, and yes condensation was the next thing I noticed after the heating of the room. Don't know if mondern ones have improved, but I prefer using an oil filled elecric radiator myself. Disadvantage of course, no instant heat, but the ones I've seen are thermastatically controlled, so can be left on low heat to keep the chill off. They can of course be put on a timer to come on shortly before you go into your workshop, if you have some regular times when you know you are going to be in there.
 
Regards Nick.
Thread: Anything About Acetylene
31/12/2010 20:46:45
Hi Ian, I kinda like your spirit.
 
No! I never got one end of a pipe hot and then filled it with acetylene the other end, too dangerous and noisy.
 
regards Nick.
Thread: gas filler valves
31/12/2010 20:08:50
Hi all, instead of hijacking this thread any further I have created a new thread on the subject of acetylene.
 
Regards Nick.   and A happy new year to all.
Thread: Anything About Acetylene
31/12/2010 20:00:57
Hi,
       I have been following the threads about gas filler valves, it transgressed somewhat into postings about propane cylinders and then on to acetylene and I feel a thread on the subject of acetylene or propane, its usage storage, and safety may be of interest, as many people seem to have them in thier workshop.
 
I have been using oxy-acetylene all my working life, I have reconised qualifications in the use of this equipment.
 
    I have also had BOC training in the inspection and maintainace of "portable" oxy-fuel gas equipment. This does not cover manifold systems, although I do know the basics of them.
 
   In the above mentioned thread Richard Parsons mentioned a copper manifold on acetylene. All the training I've ever had has stated that copper and acetylene together is a no-no. The copper nozzles are not an issue, as it is a mixture of oxygen and acetylene by then and the hazadous reactions don't occur.
 
My question is if anyone else knows about copper manifolds with acetylene, because as far as I've ever been aware copper and and acetylene in contact is potentially hazadous with possible fatal out comes.
 
Anything about the subject of gas equipment primerally for use in the workshop is welcome.
 
Regards Nick.

Edited By Nicholas Farr on 31/12/2010 20:03:28

Thread: New Year's Resolutions
31/12/2010 19:26:30
Hi David,
                 I personally feel that MEW should be primerally about its title, and that model articles should not be included. I do however, feel that although very popular, Myford are not the only manufacturer of lathes and maybe attachments/improvements for other makes could be wrote about more often. I myself don't consider myself as being much of a designer of such things though.
 
Regards Nick.
Thread: gas filler valves
31/12/2010 12:28:12
Hi Richard, copper manifolds with acetylene? I've only ever had training with portable equipment so I can't question this, but copper tube in a split or cut hose was very much frouned apon, and was regarded as being very un-elfin safety. This was at BOC seminars. Steel was regarded as an temporey OK in acetylene, but not in oxygen, where copper could be used.
 
    Andrew, yes the regs I was refering to were for "portable" classed equipment.
 
Regards Nick.
Thread: Warco Lathe Motor Issue
31/12/2010 11:27:00
Hi Gordon,
Posted by Gordon W on 31/12/2010 10:55:07:
Multi V belts, in industrial usage, are always fitted as matched sets, ie. the set is specially selected to be the same lengths.
 
 
 
 
 Where I worked a few years ago, they had that policy. However because of a very high number of machines involved, there were many of them that used the same size belts, but some only 3 belts some 4,5 and even 6. The stores stock level was keep to the highest amount needed for any one drive size. Consequencely if you had to use 4 out of a 6 set you would have 2 left from a matched set of 6 combined with 4 new stock ones. With a stock level of around 1000 belts booking out a set of 6 to use only 4 or 3 was a no-no, so a mixture often happened.
 
Regards Nick.

Edited By Nicholas Farr on 31/12/2010 11:27:53

Thread: M.E. Magazine Delivey Issue 4394
31/12/2010 09:19:46
Hi, postie just handed me my copy of ME in this little corner of NW Norfolk.
 
Regards Nick.
Thread: gas filler valves
30/12/2010 19:59:36
Hi, I know this is getting away from the OP, but I will just add a little more.
 
   Andrew,
                   I'm not sure if kapok is still used, but you are spot on. Without going into it with to much detail, the kapok holds the acetone and the acetone holds the acetylene.
The chemical formula; C2 H2 makes it the hottest and most efficient fuel gas and I beleive the most explosive with the flammability limits between 2% and 82% in air. Yes nice stuff but doesn't like silver, mercury or copper. It will form acetylides with them, which are impact explosives, i.e. just the slightest knock can make them explode.
 
   Ian,
          yes it does become very unstable above 15psi, but the acetone will be drawn off if used when laying down or if not allowed to stand upright for the specified period after being layed down. Drawing off acetone will reduce the efficiency of the flame, but more over will reduce the ability to hold the acetylene in a stable state inside the cylinder.
 
   Neil,
            the stinky yellow goo, is probaly residue from the smell they put in to it at the refinery, as LPG is naturally oderless.
 
Regards Nick.

Edited By Nicholas Farr on 30/12/2010 20:02:03

Edited By Nicholas Farr on 30/12/2010 20:09:20

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