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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: Warco Lathe Motor Issue
30/12/2010 14:42:54
Hi Anthony,
                     local bearing/power transmission supplers would be one place to try, eg. Eriks, Hayleys, ect. if you have them in your area.
 
Regards Nick.
Thread: gas filler valves
30/12/2010 14:21:42
Hi,
      Ian,
             the rate of gas boiling of the liquid inside the cylinder is somewhat determined by the anbient tenperature, and is the result of themal energy transfering through the cylinder wall. In high demand or low temp situations, cylinders can be manifolded together to overcome high rates of gas demand.
 
      Andrew,
                     your glider could be a grey area. Unless you check it out, you may find that an RTA, should you ever be unfortunate, will give you the answer.
 
Regards Nick.
Thread: Warco Lathe Motor Issue
30/12/2010 13:58:19
Hi Anthony,

      Posted by Anthony Salisbury on 30/12/2010 13:40:43:

I checked the pulley alignments and they seem ok at least no worse than before. I was still concerned about the belts so I got them to what I felt was right and marked across the belts to see if they where slipping. As I guessed they where slipping so I further tightened these.
 
You will allmost always get some creep between belts on a multi pulley drive, espcially after removing and remounting them.
 
Some gear oils do look and feel a bit "watery" as you say. It is best to use the grade which is recommeded by the manufacturer of your machine.
 
Regards Nick.

Edited By Nicholas Farr on 30/12/2010 14:00:23

Thread: gas filler valves
30/12/2010 13:24:39
Hi Kwil, if propane cylinders containing liquid propane are allowed to be laying down, the liquid can affect the operation of the relief valve, with potentially hazardous results.
 
Acetylene cylinders may be transported laying down, but not recommended, however if acetylene cylinders have been lying down, then they must be standing upright for the same period of time, up to 12 hours before the valve is opened; i.e. if you've had them lying down in your truck/van to take to a job and it's taken you 1 hour to load travel and unload, then they must stand upright for at least 1 hour before attempting to use them. They must never be used laying below an angle of about 30 degrees from upright.
 
BTW it is illegal to transport portable cylinders on the british highway with the equipment being attached, some exceptions are any vehicle powered using gas cylinders or vehicles using gas equipment for road maintenece etc. life dependent equipment eg. oxygen breathing equipment.
 
Regards Nick.
 
30/12/2010 11:25:09
Hi, we are all aware that compressed propane turns to liguid inside the cylinder, its boiling point in the natural atmosphere is --42.1 degrees. While you have liquid proane in the cylinder, its equilibreum pressure inside the cylinder at normal temperatures is always approximately 7 bar (100psi approx)
 
   1 volume of propane liquid will produce approximately 250 volumes of gas when vapourised. Propane gas is typically one and a half times heavier than air, and will settle in low points, gullies, drains, cellers and the like. It is a difficult gas to be despersed and should not be stored or used below ground, e.g. cellers. It must be remembered  that as well as being highly flammable, with flammability limits in air of 2% to10% approx, it is also an asphyxiante.
 
Propane cylinders must always be used, moved and transported in the upright position. Exceptions are those special types used on fork lift trucks ect. which, by thier design are effectively in thier upright position lying down.
 
Regards Nick.

Edited By Nicholas Farr on 30/12/2010 11:29:59

Edited By Nicholas Farr on 30/12/2010 11:51:32

Thread: Free gauge 1 plans in December Issue
30/12/2010 00:23:07
Hi Jeff, thankyou for making your point clear, but I did metion this in my first post here. I still maintain that this will have to be formed at the very least before the half circle is cut out. I'm not dissagreeing with what you say, but I felt it may have been hard for beginners to understand and felt your sketch was not totally clear with the original notched area drawn dashed.
 
For the benefit of beginners just saying something is wrong without explination is confusing.
 
Regards Nick.
Thread: gas filler valves
29/12/2010 21:17:41
Hi Ian, I had that happen with a box of Swan Vesta matches before the advent of the first type of refilable cheap gas lighters. Very startling I can tell you. Have heard of it happening to people with the desposables in thier boiler suit side pockets, while welding. Nasty flash burns are one result I understand.
 
Regards Nick.
Thread: Need to Anneal ?
29/12/2010 18:56:31
Hi Steve, unless you are able raise the temperature uniformally, and keeping it supported over the whole area of the sheet from cold, you will get warping and distortion. You would probaly be better of using it as is.
 
Regards Nick.
Thread: Rulers - my pet peeve
29/12/2010 10:31:05
Hi, I'll not rule it out myself Andrew.
 
As far as the definition goes between rule and ruler, in my dictionary, rule has 10 definitions. The first being devided into a & b; a, being, govening power and b, the period that such authority lasts. Rule as a measuring device comes in at eighth place.
 
The definition for ruler has only 2. The first being, one that rules. The second pertaining to a measuring device.
 
Therefore in your schooldays John you may have been closer by calling it a ruler and your rap on the knuckles unjustified.
 
Regards Nick.
 

Edited By Nicholas Farr on 29/12/2010 10:49:27

Thread: Free gauge 1 plans in December Issue
28/12/2010 15:03:59
Hi Jeff, forgive me, but I still don't quite see your point. The full drawing does not give any preference to first or thrid projection, the hieght of the feathered edge above the centre line is shown as approximate, the fact that the dotted line showing hidden detal, not being exactly lined up with the cut out, IMO is of no consequence. If you think the projection is wrong handed to be professonally correct, I still think it is plain to see how the two relate to each other.
 
Regards Nick.
Thread: Rulers - my pet peeve
28/12/2010 13:38:31
Hi John, I couldn't agree with you more. Very frustrating is'nt it. I luckly have two 300mm ones that are the same top from right hand edge and bottom from the left hand edge and on the reverse side are the same top and bottom but with the addition of the half mm devisions. These are a bit long for use in the lathe, but for marking out on flat metel are ideal when you have left and right mesurements to mark out. There seems to be a wholesale lack of this type of rule. As you say you get imperial rules with all the fractions that you mention, but in my experience, 9 out of 10 times thier positions are completly U/S.
 
Regards Nick.

Edited By Nicholas Farr on 28/12/2010 14:15:17

Thread: Free gauge 1 plans in December Issue
28/12/2010 13:12:16
Hi Jeff, I can't understand what you feel is wrong with the side to front veiw of the throatplate, in your post of the 27/12/2010 22:31:29. Unless you are refering to the cut out in the side flange, if this is so, then you would have to form this before it is cut to size and before cutting the half circle for the barrel, otherwise it will be difficult to get a good edge at that point.
 
Regards Nick.
Thread: ML7 Tight spindle
28/12/2010 11:26:48
Hi Tony, I'm not familiar with the ML7, but Mark Frampton delt with changing the belts in MEW170 &171. Reinstating the spindle was covered in the 171 issue.
 
Regards Nick.
Thread: Warco Lathe Motor Issue
27/12/2010 12:46:06
Hi Anthony, unless one belt is seriously longer than the other, you will not have any appreciable belt slip, in normal operations. You may get some slight slip in extrem and heavy loads. As I 've said before, any amount of wear in the pulley V's wiil make a difference and may also make one belt look as if it is streched if any wear is different between the two. Also as I've mentioned you should be able to twist the belts between the two pulleys to about 80/90 degrees to be about right. V type belt drives that are drum tight produce excess heat, increased wear, overloads the bearings and increases the power input required.
24/12/2010 17:33:37
Hi Anthony, from your photos, the belt alignment doesn't look to bad. One way of checking alignment is to trap a piece of string under the outermost belt on the large pulley and pull it taught over the top and then swing it towards the bottom pulley untill it just touches the highest point. If the pulleys are in line then there will be no gap across the diameter of them, and the string, as shown in the photo below.
 

Look at the grooves of the pulleys espcialy the motor one, they should be very much V shaped and not U shaped. If the bottom flat bit looks very shiny, then the pulley and/or the belts may be badly worn. You should be able to twist the belts about 80/90 degrees between the pulleys, if the tension is about correct. Hope this is of help.
 
Regards Nick.

Edited By Nicholas Farr on 24/12/2010 17:45:55

Thread: Late delivery of magazines due to adverse weather
23/12/2010 10:00:33
Hi, both MEW172 and ME4393 have just been pushed through me post box. Might wait till Xmas day now before I open and read them.
 
Regards Nick.
Thread: Which slideway oil is best?
23/12/2010 01:36:21
Hi, I'm not sure but I think the conclusion about car oil was not using, used car oil, because of the contamenets associated with being used in the combustion process. I can't remember what they might be though.
 
Regards Nick.
Thread: issue 171
22/12/2010 00:46:28
Hi, got my Jan' subs EIM, but no MEW172 or ME4393 as yet.
 
Regards Nick.
Thread: HSS tool inserts
21/12/2010 13:12:24
Hi Paul, I concur, Cobalarc are tubular filled with a powder type deposit. They really are only any good for hard facing, and there were several different grades for different applications.
 
Regards Nick.
20/12/2010 18:39:04
Hi, I can remember having to build up tool shanks with Stellite rods, using Oxy-Acetylene welding during my course work, in my advanced gas welding year. The actual welding rods made really good scribers, and I've used them more for this than welding with them.

   I remember the HARDEX electrodes (proper name) that Len metioned, but only used them for hard faceing quarry buckets and the like. A much better hard facing electrode, IMO, was Cobalarc, both were made by BOC/Murex and there were a few different grades for different wearing extremes. The ones you used Len, may have been Hardex 350 as some of the others are unmachinable and were designed primerally for earth moving equipment.
 
Regards Nick.

Edited By Nicholas Farr on 20/12/2010 18:46:57

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