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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: Cheap source of mild steel plate
01/12/2010 18:40:40
Hi Robert, do you not have any local fabrication shops nearby, they often have offcuts that are not ecconomical for them to keep. As Gordon says the price of a pint or two can work wonders.
 
Regards Nick.
Thread: reversing a milling machine
01/12/2010 13:55:55
Hi James, I doubt that your idea will work on a single phase ac motor. Like John has said, you need to change the armature/field winding relationship. Most motors allow you to do this inside the connection box. To do this with a remout switch you will have to bring extra wires out of the motor to the switch.
 
Regards Nick
Thread: Mills
30/11/2010 15:00:36
Hi the other DC, well spoken. I have to agree with what you have said. But don't stand off allways, a little objectiveness can be benifical.
 
Regards Nick.
30/11/2010 14:28:31
Hi, I agree the OP had been covered well. I find some off topic posts interesting, sometimes they have a connection to the thread and have the ideal relavence at that particular time only. There are of course off topics that I'm not interested in, and I just skip over them, no big deal.
 
Regards Nick.

Edited By Nicholas Farr on 30/11/2010 14:28:55

Thread: Cutting steel plate
30/11/2010 13:25:49
Hi Peter, be very carefully then, because they'll cut through ordenary footware very easy and will keep going before you have time to stop. Position yourself as best you can so that if the disc does snatch i will be away from body area. I've seen nasty injuries with these, with people who don't think about which way they will pull out of your hands, and somtimes they can catch you out like that. I've been using such gear for 40 odd years and still get the odd snatch now and again. Mine are all 110V industrial jobbes.
 
Regards Nick.

Edited By Nicholas Farr on 30/11/2010 13:27:39

Edited By Nicholas Farr on 30/11/2010 13:28:01

Thread: levelling
30/11/2010 12:47:07
Hi Terry, I understood your post about the IPhone and appreciate its values. Idon't have one and agree with you that is not expected one should buy an IPhone just on that merit. I just pointed out what I have that was not too expensive, but low cost dail angle gauges can work as well. Digital gives you a figure, whereas you might argue with yourself is it above or below the line with a dial. People with ungoolgeled eyes of course can read dials easyer than I can.
 
Regards Nick.
Thread: Cutting steel plate
30/11/2010 11:58:24
Hi Peter, you can get 5/64 (2mm) cutting discs for your 9" angle grinder cut steel pretty reasonably, but don't go to the likes of B&Q as you'll pay more, better off going to local engineering suppliers, as the quality is better at a better price. I use 9" 7" 4.5" and 4" angle grinders myself, not necessarily in that order of course. You should always wear appropriate gear with these, i.e. ear defenders, visors, overalls, steel toe cap boots, gloves, idealy anti vibration gloves are best.
 
Regards Nick.
Thread: issue 171
30/11/2010 11:31:53
Hi Peter, I've though that maybe something has been going wrong in my area at times, maybe a postman getting his own free copies perhaps (not that I Am throwing accusations here or anywhere else). I have had the odd ME not turning up, but have phone it in and got a replacement, but I still haven't recieved MEW169, They tell me they are waiting on thier supplyers for this and can't give me a date when it is likely to arrive. About time I rang them again maybe, what do you think David?
 
Regards Nick.

Edited By Nicholas Farr on 30/11/2010 11:33:17

Thread: levelling
30/11/2010 11:15:08
Hi, with ref to John's post, 30/11/10, yes it is ideal to have the mill table level for a referance point to set up your work, but you can still do that if it isn't. The best way is to use an angle gauge or graduated precision level and read what angle your table is and then just add or subtract that to the level you want your work at.
I have one of these digital protractors, which you can set to zero at any level and then it will give you the direct differance at any other angle and there are little arrows on the left of the digits to show if it is up or down, but in most cases it is obvious.
 

Very handy and not terrable expensive, its resolution is 0.1 degree.
 
Regards Nick

Edited By Nicholas Farr on 30/11/2010 11:16:55

Thread: Mills
30/11/2010 10:57:20
Hi, Gordon and wolfy, I've done similar things, so I might get shot down as well. The thing is if it works and is simple and safe, then what does it matter.
 
Regards Nick.
30/11/2010 10:28:22
Hi, I think these complaints about thread post content are contradictory in themseves as they are also off topic, are they not. Espceialy long winded and detailed ones. Should you not open a new thread titled post content complaint, or somthing.
 
Regards Nick
Thread: LBSC Locomotives
28/11/2010 23:45:15
Hi David, are you wanting actual original copies of ME's or scanned copies of the original articals.
 
Regards Nick.
Thread: Mills
27/11/2010 00:20:02
Hi Terry, this is the paradox, I'm understanding that is should not be possible and the reasons why. However, I never saw him use any thing else but an end mill when he cut a keyway with this set up and he did not have any slot drills or otherwise for cutting closed keyways. The only other cutters were the side and face cutters used on the spindle between the machine and the support arm. These of course leave the curve of the cutter at each end of the keyway, and are used over the top of the work piece. All of the cutters belonged to the firm we worked for of course, but they were of his choice.
 
Regards Nick.
26/11/2010 19:04:37
Hi David, here is a photo of a mock up of the set up for milling keyways that the old timer machinist I refered to in a previous post used to use.


Of couse he would have it clamped down. I can't actualy try his method, because this machine is inoperatable at the present time.
 
Regards Nick.

Edited By Nicholas Farr on 26/11/2010 19:05:12

Edited By Nicholas Farr on 26/11/2010 19:08:01

Edited By Nicholas Farr on 26/11/2010 19:17:51

26/11/2010 13:30:16
Hi David, he only ever had 4 fluted end mills and there was never any predrilling of any sort. I had watched him set up and start his machining process while waiting for a part for a breakdown job. At that period in time I never gave much though to the techniques, as I was not into any milling at the time. There were not many keyways cut below 1/2" /  12mm and most shafts were 2"/ 50mm up to 4"/ 100mm.
 
Regards Nick.

Edited By Nicholas Farr on 26/11/2010 13:33:18

Edited By Nicholas Farr on 26/11/2010 13:36:09

Thread: Working with Cast Iron Billets (Grade Selection)
26/11/2010 12:54:48
Hi, I don't know what the term "Meehanite" actualy means, if it just a trade name or a  process. However when I was a college, part of the sylibus included some basic mertallegy. In them days cast Iron was referred to as being grey or white, the white being extremly hard and brittle and difficult to weld. It was used for example for such things as fire grates for its resistance to heat corrosion. Grey cast Iron was however softer and much easyer to weld, but it could also be made to what used to be termed as "mallable cast Iron". This was achieved by cooking it buried in a compond (of which I can't remember the name of or the temperatures involed or for how long a period) which drew out some of the carbon content, but kept the cast Iron properties to a certain extent. This is the process that made it mallable which can be termed "heat Treated". Mallable cast Iron was always easyer to cut and drill ect. So wether "Meehanite" falls into this catogory or not, I don't Know.
 
Regards Nick.
 
P.S. you wil have to forgive any errors or emissions in my post as it was way back in the late 60's early 70's when I learnt this.

Edited By Nicholas Farr on 26/11/2010 12:59:53

Edited By Nicholas Farr on 26/11/2010 13:09:13

Thread: Mills
26/11/2010 11:49:00
Hi, this paradox about end mills not been able to cut closed slots in a material has bewildered me. In a previous employment in the dept' I was in, there was an old timer machinist. He never had any slot mills/drills and all the closed keyways in shafts that he cut were done with end mills of the finish size. I fitted a hugh amount of these shafts in my time, with keyways cut in this manner and never experenced any over size. The keyways were always clean and flat in the bottom, they were however cut on a horizontal mill with the shaft mounted so the keyway was cut on the side. The mill was a Parkinson No. 2. I've never tryed this approach myself, but with all that I've raed about not using end mills in this way, I wonder how this would have been achieved.
 
Regards Nick.
Thread: PRECISION , ACCURACY and QUALITY
26/11/2010 00:28:42
Hi john, I'll take your point on the stone age guys. Probaly not a good comparison, but I don't think thier fashion would make it on the catwalk.
 
Some dictionary defenitions of precise:  clearly expressed or delinated; distinct; definate; eactly corresponding to what is indecated; correct.....  Or in other words not deviating from the specified target
 
Imagine two precision levels, one having a resolution of 0.1mm/10 and one of 0.001mm/10 but both claiming an accuracy of 1%.  Thier accuracy would be the same but the precision will be much different.
 
Imagine the old English Longbow men one fires all his arrows precisely on the alliance with great accuracy. Bit of a job correcting that sort of error.
 
Regards Nick.

Edited By Nicholas Farr on 26/11/2010 00:29:38

Edited By Nicholas Farr on 26/11/2010 00:37:01

Thread: Chinese lathes
25/11/2010 22:47:39
Hi Jens, you can read the forums without being logged on, that way you won't see who is reading.
 
Regards Nick.
Thread: PRECISION , ACCURACY and QUALITY
25/11/2010 22:32:14
Hi,  Posted by Stub Mandrel on 25/11/2010 21:04:40
      Another way of looking at it is to think of target shooting. Get a goud grouping way off the bull and your shooting is precise, but not accurate.
 
Not very precise if the specified target is the bull. I'd call it consistant.
 
I'll put it this way; accuracy is the tolerance of precision.
 
Regards Nick.
<< First < Prev 188 189 190 191 192 193 194 195 196 197 198 Next > Last >>
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