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Member postings for Michael Gilligan

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

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Thread: Linear division in early 20th century
02/04/2012 21:31:05

Bazyle,

"hackuracy" is a great term ... it made me smile.

I think your local works would have either relied upon a leadscrew, or spaced it out with dividers.

For the benefit of future readers: It's worth mentioning that a Gaertner-style "effective pitch adjuster" could be used [for example] to convert a 26tpi leadscrew to 1mm pitch [or vice versa] ... very handy for those occasional jobs.

MichaelG.

02/04/2012 08:18:13

Bazyle,

http://www.practicalmachinist.com/vb/general/expiriments-leadscrew-lapping-218177/

is worth reading ... especially Posts #19 and #20

MichaelG.

Thread: Hobbymat sale?????
09/03/2012 19:23:28

I too received eMail from Lukas Walter [in Dublin], relating to my Milling Vice.

I was particularly impressed by his assurance of ... "pickup by my reputable shipping company's staff Sir Ashley Owen"

MichaelG.

Thread: How to repair a banjo
08/03/2012 08:03:25

Neil,

To answer your original question:

http://www.goldschmiedebedarf.de/product_info.php?products_id=7520

MichaelG.

Thread: Does This Impress You?
05/03/2012 16:58:13
Posted by Axel on 05/03/2012 14:51:31:

I'm trained in gunsmithing, when making fitted screws, or pins as they are called in the British gun trade, the slot is made last. the head is left too tall until its ready to be filed down. First the screw is tightend then a mark is made and the screw removed, a slot is made, and the screw refitted and filed. Most screws on shotguns are made thus, since no standard screws would fit the shape of the body of the gun.

Axel,

Thanks for the insight ... I knew about the Horologist's method [cutting back the underside of a cheese-head], but not this.

MichaelG..

04/03/2012 10:06:50
Posted by JasonB on 04/03/2012 07:50:18:

You will be hard pushed to find chippies these days aligning slots in hinges because We now use pozi headed screws, very rare to have slotted screws in hinges.

I will line up screws in door furniture/ironmongery if they are slotted and if brass & there is a risk of overtightening then try another screw until you get one that lines up without risk of snapping.

What anoys me more is the poor quality of a lot of screws supplied with even quite expensive fittings.

J

When my new Workshop door was fitted, by a "Professional", I noticed that most of the nice Brass screws in the Hinges were badly damaged. ... The screws are Phillips cross-point, but he had managed to drive them with a Pozidriv bit in a powerful electric Drill/Screwdriver.

... You can imagine the mess that makes.

It took me twenty minutes to explain that there is a difference !!

MichaelG.

Thread: Useful-Looking Helical Gears
19/02/2012 20:44:51

Fair enough I suppose ... if modern "Budget Tools" burn out before the gears wear out.

But: My angle grinder is still going strong after 25 years of occasional use!

... and these gears are only £4.14 Post Free.

MichaelG.

19/02/2012 09:02:18

Just spotted these on ebay, and thought they might be useful.

Please Note: I have no connection with the Seller.

MichaelG.

(Posted using iPad, as a test of the new forum software.)


iPhone/iPad URL:
2 Pcs Power Tool Metal Spiral Bevel Gears for LG100 Angle Grinder

Browser URL:
2 Pcs Power Tool Metal Spiral Bevel Gears for LG100 Angle Grinder

Thread: How do I cut this out??
04/02/2012 17:57:27
Hope you have a Rotary Table !

Slitting Saw for the straight cuts.
Slot Drill for the curves.

If it needs sharp corners, finish by hand.
If not, keep the Slot Drill radius ... to avoid "stress-raisers"

MichaelG.

Thread: Suggestions please Vol3
03/02/2012 08:29:49
Ian S C
If I may be philosophical for a moment ...

In the small hours of yesterday morning, you professed "I know nothing."
Now; you have some real understanding of the workings of an astonishing piece of technology ... which, thanks to mass production, is available at very low prices, for us to experiment with.

I rejoice that we have the means [through forums like this, and through the democratising power of the Internet], to share the little knowledge that each of us has acquired.

Across the world, there are; creative minds, clever technicians, and people who need things ... Never in the history of our civilization has it been so easy to put them together!

It feels a better day already.

MichaelG.
02/02/2012 09:31:53
Ian S C
I may be wrong, but: To my mind, the video ones seem better suited to measuring Displacement than Speed.
... The Slotted Disk Encoders are already "non-contact".

MichaelG.



But it is certainly possible ...

http://www.kronosrobotics.com/Anotes/Athena%20to%20Optical%20Mouse.pdf

Edited By Michael Gilligan on 02/02/2012 09:41:54

02/02/2012 09:09:56
Reminder ...

"Optical Mouse" has become an ambiguous term.

The ones that we are most likely to re-use have a Ball, driving Optical Shaft Encoders.

The new fangled ones [as referenced earlier] have Video sensors.

MichaelG.
02/02/2012 09:00:08
Ian,

Yes indeed.
... I did see a good write-up for a simple Tacho, but failed to bookmark it

Meanwhile ... This does the job, and More!
http://sci-spot.com/Mechanical/dyno.htm
Definitely worth exprimenting with this one.


MichaelG.
01/02/2012 19:31:15
Thanks Les ... must try to find one or those!

It's off-topic really, but: here's a useful link for anyone interested in the workings of the Optical Mice.
http://tim.cexx.org/?p=613

MichaelG.
01/02/2012 16:33:34
Les,

That must have been an ancient mouse ... what model was it?

Every mouse I have stripped-down had optical shaft encoders:
of course, the latest ones use video camera technology, but we're getting a bit out of my depth there.

MichaelG.
01/02/2012 12:03:59
Gray,

If you do go the electronic route ... you need a "quadrature decoder" to detect direction.

A few years back, there was a lot of interest in using the shaft encoders from a computer mouse ... this would seem ideal.

There should be lots of guidance around on the web.

MichaelG.
Thread: Alba 1A Shaper Graduated Dials?
30/01/2012 20:15:37
For info ...

http://www.npl.co.uk/reference/faqs/on-what-basis-is-one-inch-exactly-equal-to-25.4-mm-has-the-imperial-inch-been-adjusted-to-give-this-exact-fit-and-if-so-when-(faq-length)

MichaelG.
Thread: A Drilling Spindle
26/01/2012 11:07:56
My Horological Journal , dated February 2012, arrived this morning:

On page 63, there is a superb idea for a Drilling Spindle to fit a Myford Cross-Slide.

"After the DLC 24 by Guy Gibbons MBHI"

Very cleverly, it is based around a casting for the GHT Dividing Head.

Brilliant!

MichaelG.
Thread: MEW 186 - Electronic Lathe Control
21/01/2012 17:51:23
That's a very impressive video, Tony.
... Thanks for posting the link.

MichaelG.



P.S.

For anyone interested in the history of ELS ... http://homemetalshopclub.org/projects/electronic_lead_screw/els.html

Edited By Michael Gilligan on 21/01/2012 18:09:27

Thread: Alba 1A Shaper Graduated Dials?
20/01/2012 23:33:29
Neil,

Agreed; it would be wonderful ... bringing instant convergence of Metric, Imperial, and Binary.

On a practical level [as I'm sure you realise]; we can often get away with the approximation ...
"Quarter Scale, Metricated" is a favourite of mine.

i.e. One Inch at QSM is 25.6/4mm = 6.4mm
One sixty-fourth is then a very convenient 0.1mm

Makes scaling-down from old drawings very simple!

MichaelG.
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