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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.

Thread: Neville Evans
23/10/2010 23:13:13
Hi, it's never nice to hear of peoples illness weather you know them personally  or not. My grandfarther had about 4 or 5 heart attacks in his last few years of his life way back in 1965. I would also like best wishes for Mr Evans to be passed on.
 
Regards Nick.
Thread: Are steam engines better now in preservation than they were in ordinary service
23/10/2010 13:01:54
Hi, refering to Neil's thread, this is why goods loco's have smaller wheels because you put more power into a shorter distance. I can remember when I was just a mini me we lived on top of our railway very close to the station and the kiddies playground is dead opposite the station, on occastions when a passenger train started off you would see the wheels slip. Despite theses loco's being bigger and heavyer than the goods loco's, I can't ever remember a very long goods train doing this, in them days we had as many if not more goods trains as passenger trains, and they were always slower.
 
Steve, I believe the 9F's have coparatively smaller wheels than most of the passenger loco's of the same size, and were used for goods traffic for most of thier service.
 
Regards Nick.
Thread: Vice/rotary table question
21/10/2010 11:06:35
Hi, I to have a 6" Vertex rotary table, which I bought secound hand from an acquaintance who needed a bit of cash, it was almost new and little used. However cheaper gear does not mean "cheap", you have to wiegh up the cost aganst usage. I believe that likes of Warco, Chester, Arc Euro Trade, Axminster ect. ect. all have good quality goods without the brand name price tags. When you do buy a rotary table, however, I would suggest getting one that you can use the optional dividing plates on, even if you can't afford them at the same time. They are a very usefull addition.
 
Regards Nick.
Thread: Midlands Model Engineering Show at Warwick
21/10/2010 10:43:46
Hi Bogs, I agree with you that Donnington was a far better venue, but I still went again this year. I never have a rucksack BTW, do usually have a small camera bag with my SLR in it which I don't like being bashed about. I hate carrying to much clobber around with me.
 
Regards Nick.
Thread: Are steam engines better now in preservation than they were in ordinary service
20/10/2010 11:28:24
Hi, I always understood that most of the goods loco's had smaller wheels for thier pulling power, whereas pasenger loco's had large wheels for thier speed, and the mixed traffic loco's had wheels of a size somwhere in between.
 
Regards Nick.
Thread: Simpler the Better -what do you use?
20/10/2010 11:00:53
Hi Sam, I've got one called Key Cad Complete by the Softkey people, don't know if it's the same lot. This version is copyright 1999 The Learning Company, and part of CompuServe Inc. It's pretty straght forward and was designed for Windows 3.1/95/98. Works OK on XP and Vista, but used to freeze up after a while on Windows 2000 so you had to save almost every step. It doesn't compare with the likes of Autocad of course but it is fairly simple, I think it cost about a Tenner which wasn't a bad price. I use this one to plot out my family tree on, my latest print out for that is 36" X 45"
 
Regards Nick.
Thread: Continuing Articles
18/10/2010 08:29:15
Hi Jim, just Googled M. C. Escher, wasn't familiar with the name but, yes I've seen some of the illustrations.
Regards Nick.
17/10/2010 23:47:16
Hi Andrew, I know this is off topic a bit, but I believe you are correct. I was given a drawing similar to the picture below, some 40 years ago. I was asked if I could build one, I still havn't figered out how it can be achieved.



This is my own humorous interpretation of the original drawing, it was supposed to be some sort of gate made from wodden planks

Regards Nick

Edited By Nicholas Farr on 17/10/2010 23:48:07

Thread: Chronos silver steel, water or oil quench?
13/10/2010 00:15:00
Hi, posted by Sam Stones, For the technically inquisitive, I recall that there’s something about the carbon atoms shifting between body-centred and face-centred, but I can’t remember which way round.
 
  Sam, I believe you are describing the allotropy of Iron.
 
I had to dig out my college notes from 1977 for this one.
 
Iron can exist in two forms, Ferrite and Austenite. On cooling, it is in its Austenite form at temperatures above the upper transformation line (695 to 920 degrees C)
As cooling continues through the transformation zone (between upper and lower lines) the Austenite changes to Ferrite. During this change Carbon is precipitated from the Austenite, because Carbon is insoluble in (Iron) Ferrite. The precipitated Carbon is in the form of Cementite which goes to form Pearlite, or in the case of steels with over 0.83% Carbon the excess cementite remains on the grain boundries.
Time is needed for these changes to take place. A slow cool will enable the changes to take place and will result in a large grain structure. A faster cool will result in a smaller grain structure.
However, if the cooling rate through the transition range is increased sufficently (i.e. quench) time will not be allowed for the changes from Austenite to Ferrite to take place. In this case there is insufficient time for the Carbon to be precipitated out of solution and this result in the Carbon atoms being forcibly locked in the Ferrite structure. This may be described as a super saturated solid solution of Carbon in Ferrite Iron.
Due to the distortion caused by the Carbon, the grains are acicular (needle like) and are very hard and brittle. The name of this structure is Martensite.
 
Regards Nick.

Edited By Nicholas Farr on 13/10/2010 00:16:09

Thread: Change gears for my lathe
12/10/2010 19:13:31
Hi Peter, thanks fo clearing it up, makes a bit of sense now. I was never very good at jugling equastions about. Have written it in my manual as you have shown. maybe all the number crunch's will stop saying we need 63 and 64 together, or a 127 wheel.
Regards Nick.
12/10/2010 12:12:44
Hi,
      Gordon I though it was just me that was a bit thicko about module threads.
 
      Keith I'm always waiting to be shot down in flames, good way of learning though.
 
Regards Nick.
12/10/2010 11:34:35
Hi Chris, as I've stated previously, the 61, 63 and 64 on this lathe are never used in the same train, let alone on the same shaft. So unless the combination is embedded in the other wheels somehow, in the train saying the 63 or 64 is the driver in all aspects, doesn't seem to follow.
Viz. selection chart.
 
Peter, in my photostat copy, the inch calculations are expressed thus;
 
      7 x 25.4/28.0035 multiplyed by z1/z2 x z3/z4 x z5/z6
 
this dosen't seem to tally with the chart. However.if it is expressed like so it does;
 
      7 x 25.4/28.0035 devided by z1/z2 x z2/z3 x z4/z5
 
maybe there was a printing error

Regards Nick

Edited By Nicholas Farr on 12/10/2010 11:39:35

Edited By Nicholas Farr on 12/10/2010 11:54:41

Edited By Nicholas Farr on 12/10/2010 12:07:26

Thread: Good Supplier of Sheet Metal Shear and Bending
11/10/2010 08:03:53
Hi Ant, I've only ever used hydraulic guilotines but as far as bending is cocerned even hand folders made by the likes of Edwards industrial machines only have a capacity of 1.5mm for that sort of length. As Bogs says bending 1metre for example of 1mm isn't exactly a push over, and these are usually heavy duty machines. Can't say I've heard of any treadle guilotines much over 1.5mm/16swg. Above this sort of thickness you are really getting into what is termed as plate and not sheet metal.
Regards Nick.

Edited By Nicholas Farr on 11/10/2010 08:06:30

Thread: Change gears for my lathe
10/10/2010 21:31:06
Hi Peter, I bought this lathe secound hand so it could just have been lost by previous owner/s.
Bogs, I agree with Peter, 61 is always used for module, 63 is always used for imperial and 64 is always used for metric. No combination shows any of these three in the same train.
Regards Nick.
10/10/2010 17:42:00
Hi Peter, I also have a Warco 220, today I've looked and merasured my change wheels. I have all that you have except the 61 teeth. They are all marked Zxxm1.5 and they all mearsure to be 1.5 module. I have an original C210T manual and a photostat copy of the 220, dosen't appear to be any mention in either about the markings on the wheels. The 61 teeth wheel only seems to be needed for cutting module threads, I probaly won't ever have to cut mudule threads anyway. Hope this is of help or interest.
Regards Nick.
Thread: Belts - Maintainence & when to change?
09/10/2010 02:07:48
Hi, a couple other things to look for are; see that the V shape hasn't gone a bit rounded at the bottom part of the belt and/or see that the flat bit on the inside of the belt isn't touching the bottom of the pulley's, both pulley's will be shiney in the bottom if this is the case. If however one pulley is shiney in the bottom, then it's more likely to be the pulley that is worn, especially if it's the smaller pulley. Belts and pulleys that are in good condition and properly adjusted should never need any dressing with sprays or the like. The belt should never be drum tight, general tightness is about 16mm deflection at mid position, per metre of of pulley centres, but should be a bit higher on short centered drives. If your pulley centres are say 300mm or less, then set them with about 25mm to 30mm deflection per metre, e.g. 25 x 0.3 = 7.5. The deflection pressure should be about (I'm genralising here) 0.6 kg on small size section belts to something like 2 to 2.5 kg on say an A section belt. Idealy the machine manufacturer will give the correct tension in the user manual.
Regards Nick.
Thread: Lathe Price Help
08/10/2010 22:51:49
Hi Darren, its really only worth what you are prepared to pay. The best way is to compair what you have in mind to those that are on offer, and see what people are paying. This is by no means definative advice, but what you are describing I personabley wouldn't pay much over £200.00 espceally if there are not many change wheels. Hope this is of some help.
Regards Nick.
Thread: Using an Imperial Ainjest Threading Unit for Metric Threads
07/10/2010 00:28:28
Hi John S, Andrews picture may have been Kilroy to some at somtime, somwhere, but when Andrew said it was Chad, I remembered that's who I remember my farther refering him to during WW2.
Regards Nick.
Thread: Metric vs Imperial - Practical or Traditional?
06/10/2010 12:50:46
Hi Mike, is not measuring as we percieve it, in itself man-made whatever unit you use? Nature has a habit of producing things in random sizes and shapes of its basic form of things, does it not?
Regards Nick.

Edited By Nicholas Farr on 06/10/2010 12:51:54

Edited By Nicholas Farr on 06/10/2010 12:53:52

06/10/2010 12:17:01
Hi David, maybe so, but fractions were around long before metrication and before the digit 0 I believe. Without the 0 metrication would be dfficult, would it not?.
Regards Nick.
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