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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.

Thread: renovating a rotary table
04/04/2012 09:26:07

For info ...

I have just looked at the html for the page

That hyperlink in my previous post is at least 12 characters too long for the layout.

Could the site developers please look at allowing word-wrap for hyperlinks?


04/04/2012 08:43:46


If you decide to go the Excel route; this looks a good place to start

it is currently set for 40:1 and is protected ... but the instructions for changing the ratio are included.



I see that the Adverts are intruding again ... Apologies if I caused that by pasting a long hyperlink.

Edited By Michael Gilligan on 04/04/2012 08:46:42

Edited By Michael Gilligan on 04/04/2012 08:51:21

Thread: Linear division in early 20th century
04/04/2012 08:04:04


To this reader at least; your last posting seems rather contrary.

We still don't know the size & shape of the component, the number of holes, or the quantity in which it was to be made. All of these are relevant to the discussion ... so why the secrecy?

One point worth making: There is nothing special about "round figures in tenths of thousandths of inches [or mm]" ... there are plenty of base-units to choose from; fractions are just as valid as decimals; and polar co-ordinates are as valid as rectangular.

Consider the mounting-hole-pattern typically quoted for a NEMA 23 motor.


03/04/2012 23:06:43


Returning to your original question

Was there a specific item that you had in mind?


03/04/2012 22:25:49


Yes, you are right ... the problems were substantially solved.

What is interesting, and a little depressing, is how much of that knowledge has since been forgotten or ignored. That's why, every once in a while, we need to dig through the history.


03/04/2012 20:58:16


The full text of Jesse Ramsden's paper is available here: http://

and an excellent commentary, here:

Both thanks to the expert Mr Morris


03/04/2012 20:50:09


Probably because it is interesting!

Please feel free to ignore my next post, where I shall reply to Terry regarding Jesse Ramsden [the 18th century Pioneer].


02/04/2012 21:45:41


If you can find it ... "The Whitworth Measuring Machine" by Goodeve and Shelley is well worth reading.

Amongst other things, they note that: "The Millionth machine, as constructed, is rather a machine for comparison than simple measurement."
Whitworth's method of standardising the anvil pressure is fascinating, and very clever!

Edited By David Clark 1 on 03/04/2012 08:10:43

02/04/2012 21:31:05


"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.


02/04/2012 08:18:13


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


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"


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


To answer your original question:


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.


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


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.


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 !!


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.


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.


(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"


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.

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".


But it is certainly possible ...

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.

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