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Member postings for Gary Wooding

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

Thread: Is it just me?
05/09/2013 17:20:44

I was profoundly disappointed with issue 207.

"CNC in the (Model Engineers' Workshop" was almost all about general milling with only a very small section about CNC, and even that was misleading. Comments on each line of the G-code would be helpful.

"Crossing Out using a Rotary Table" was a rather trivial example of using a rotary table.

"Coordinate Drilling of Holes" was really an insult to anybody who has ever seen graduated hand-wheels. If somebody using a milling machine doesn't know how the graduated hand-wheels are used then they really shouldn't be left alone with such a machine. The rest of the two-part article was more of personal history than anything to do with using a workshop.

The other articles were OK.

I guess I'm alone.

Thread: Drilling 316 stainless
23/08/2013 08:00:49

316 work hardens very easily. I suspect your drill speed is too high and the feed too low. This causes the drill to rub, which heats the steel, which hardens the steel which blunts the drill.

Use a slower speed, with a greater feed (ie. greater pressure to remove more metal per revolution), and don't forget lubrication.

Thread: New subscriptions, am I thick or what?
02/08/2013 12:29:50

I've subscribed for a number of years, and last month I could also read the online issues, but now I can't. I can see the thumbnails which are clearly "live" (the mouse pointer changes to a pointing finger), but absolutely nothing happens when I click, or double click.

Is it just me? Firefox 22.0 under Win7 x64.

Thread: A variable Lead threading attachment. Author Ted McDuffie
11/07/2013 07:36:26
Posted by Ady1 on 18/06/2013 03:11:03:

I had a feeling about this gadget and ran it through some animation software I have

The problem is that the parallelogram describes an arc as it moves... but the slide won't let it do that and forces the cutting tool part of the unit to move in a parallel fashion... so the geometry either jams up or something has to give(break)

The only solution I can see is where the little arm bolts to the big arm, you need a slot, not a hole, for that bolt as the geometry alters, and this may mess up the thread

It's a bit like a shaper drive, there's a slight arc as the drive powers the shaper head and they use a slot, not a hole, at the top of the drive

Anyway, if anyone ever builds one of these things for real... then we'll find out


I think you're wrong, because it's not a parallelogram at all. The schematic diagram is not particularly good, and is certainly not clear.

Point D is attached to the saddle via the topslide, and item 2, which holds the tool, slides across it as the lever AC rotates about point C. The link DB (item 4) is is free to rotate at both ends, so, although the vertical distance between point D and item 2 remains constant, the vertical distance between points A and B reduces as the lever rotates about point B, as does the vertical distance between points C and A.

Thread: Precision on the Beeb
29/06/2013 10:25:41
Posted by Russell Eberhardt on 28/06/2013 07:46:25:

BTW. Hans Oersted discovered electro-magnetism before Faraday.

Russell.

You are quite right, I should have been more precise; Farady discovered electro-magnetic induction.

28/06/2013 07:21:52
Posted by magpie on 27/06/2013 22:47:03:

I seem to recall he creditid Henry ford with the concept of standardisation, and no mention of a certain

Mr Whitworth quite a few years before old "enery". Once i spot an error like that i tend to question the rest.

Cheers Derek.

Yes, I noticed that too. I also noticed that although he credited Edison for the electric generator, he didn't even mention Faraday who discovered electro-magnetism and made Edison's invention possible.

Edited By Gary Wooding on 28/06/2013 07:22:43

27/06/2013 15:58:01

I was a rather surprised at his comment that adding copper/zinc/acid layers to the early battery increases the current. It doesn't; it increases the voltage.

The second surprise was his comment that Farenheit chose zero on his thermometer as the freezing point of water, whereas zero is actually the freezing point of an equal mixture of water, ice, and salt. The freezing point of clean water is 32F.

Far too much much attention to flashy graphics and not enough to precise facts.

Makes you wonder at how many other errors got lost in translation

Thread: A variable Lead threading attachment. Author Ted McDuffie
11/06/2013 14:54:51

I don't take ME, so could you make details available on this forum, or maybe email to interested parties?

Thread: Conversion Chart
06/06/2013 15:06:21
Posted by mechman48 on 06/06/2013 12:24:34:

Much as I support & welcome Daves idea for inclusion of charts; look in Roebucks 'ZEUS' pocket book (usual disclaimer).. available on flea bay etc, it has everything you would need .. tapping sizes, drill coordinates for jig boring, trigonometry, tapers, BS 4500.A ISO hole & shaft fits, etc,etc. The latest version I have.. metric revision, now includes - symbols & abreviations used on Engineering Dwgs, Misc' function words from USA-EIA standard, G code addresses for NC, letter addresses used in NC..

Cheers

George

Interestingly, I've just checked my rather old (1976) version of ZEUS, and calculated that its recommended tapping drill sizes are based on an approx 80% thread engagement.

Make of it what you will.

Gary

Thread: Installing a new lathe chuck
02/06/2013 08:12:01

If your primary objective is to securely hold tube without damage, and you have some ER collets, then have you considered these **LINK**?

Just get the hex version and hold it in your 3-jaw - its much cheaper than a 6-jaw.

Thread: Banned from workshop.
30/04/2013 09:00:49

I've got a cordless phone in my workshop - but I can't hear it ring if I'm using the mill or lathesad

Thread: Criteria for article in Me or MEW
22/04/2013 13:48:23

Posted by Raymond Griffin on 22/04/2013 13:18:31:

I may be wrong, but as I see it devices such as sticky pins and wrigglers can only be accurate when the point of the tool is coincident with the centre of the shaft. True concentricity can only be formed and maintained by the accurate grinding of hardened metal. This sounds expensive to me and far above the cost of the average device.

I don't take ME and haven't read the article, so my comments may well be irrelevant.

Anyway, as I see it, the sticky pin requires absolutely no expensive, accurate. grinding at all: any pointed needle in a blob of Bluetack (sp?) will do the job. The whole point (no pun intended) about a sticky pin is that it is easily centred each time it is used. It takes all of 10 seconds. Another comment is that the point of a needle is much smaller than a laser blob.

Am I missing something?

Edited By Gary Wooding on 22/04/2013 13:50:06

Thread: new chuck key
16/04/2013 09:11:03

I've just made one, but I used ordinary mild steel and case hardened the business end, which is now glass hard. Cheaper than silver steel too.

Gary

Thread: 3 hole pcd
15/04/2013 18:51:25

If you can mark the hole centre positions on a piece of paper held against the metal, the PCD centre is simply the intersection of the perpendicular bisectors of the lines connecting the centres.

The lines connecting the hole centres are chords of the PCD circle. The bisectors of these lines must pass through the PCD centre. This is trivial geometry.

The diagram shows that it works even for non-equilateral triangles.

pcd.jpg

Gary

15/04/2013 10:24:04

It's difficult to accurately measure the centre-to-centre distance of holes. A simple way is to use a digital or vernier callliper to measure the "outside" and "inside" distances, add them together, and divide by 2.

hole centre.jpg

Gary

Thread: Degreaser
14/04/2013 12:39:40

Don't worry about using washing up liquid as a degreaser - it's common practise to add a drop or two of it when mixing the flux powder with water; it improves the "wetability" of the paste.

Gary

Thread: Deepish Holes In Square Stock
28/03/2013 08:33:36
Posted by Ian Phillips on 27/03/2013 15:25:22:Looking at David's (Woody) album photographs, it appears that his Myford does not have a tailstock!

Ian

Hmm, b*mmer.

27/03/2013 14:21:19

Is there a reason why spinning it in the 4-jaw and drilling from the tailstock won't work?

Thread: Myford Super 7 - Single or Three Phase
27/03/2013 12:02:50

The basic rule-of-thumb for motors running from VFDs is that they give constant torque at speeds less than the standard main frequency, and constant power above.

Since power is a product of torque and RPM, power is proportional to RPM below standard frequency, and torque is inversly proportional to RPM above.

I've purchased VFDs from a well known online auction to convert my lathe, mill, and drill, and seven other machines of friends - in all cases it worked out far cheaper than the commercial offerings mentioned.

Until youv'e used a VFD powered machine you can't really appreciate the advantages.

Thread: Conversion Chart
27/03/2013 10:36:30
Posted by Bazyle on 23/03/2013 17:10:05:

Bob, please can you do a higer resolution picture of the disc thing, perhaps just the sector and a bit of the scale would do.

Hi Bazyle,

Here are pictures of both sides of my, rather old, Shetack. It's not identical to Bob's, but it does have Metric data as well as Imperial.

side1.jpg

side2.jpg

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