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|
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?
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|
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.
Returning to your original question
Was there a specific item that you had in mind?
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.
The full text of Jesse Ramsden's paper is available here: http:// http://www.fer3.com/arc/imgx/Text.pdf
and an excellent commentary, here: http://www.fer3.com/arc/imgx/Commentary-on-Jesse-Ramsdens.pdf
Both thanks to the expert Mr Morris
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].
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
"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.
is worth reading ... especially Posts #19 and #20
|Thread: Hobbymat sale?????|
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|
To answer your original question:
|Thread: Does This Impress You?|
Thanks for the insight ... I knew about the Horologist's method [cutting back the underside of a cheese-head], but not this.
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|
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.
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.)
|Thread: How do I cut this out??|
|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|
|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.
|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
"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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