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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: Unable to edit my posts.
09/12/2011 15:16:50
I suspect that you are free to edit UP TO the time when someone else has read your post. ... after which, it locks.

This would actually be quite reasonable from the Audit Trail point of view.

MichaelG.
Thread: Was this the birth of CNC ?
07/12/2011 22:41:00
My original post was poorly titled; and Billy's response is, of course, correct.

The real point that I had in mind was:
This is the first Patent that I have seen which proposes an electrical sensor and an electrical feed on a machine tool.

MichaelG.
07/12/2011 22:09:08
Fair comments, Billy.

I must confess, I should have put my emphasis on the electrical aspect.

MichaelG.
07/12/2011 19:54:37

O.K. it's not CNC as we know it ... but this may have been the first small step; and, I believe, deserves recognition.

See Fig.14 and the description that starts on line 38 of page 3.
"The feed may also be effected electrically ..."

Does anyone know of any earlier example [prior art] in this area?

MichaelG.



Sorry I cannot paste a hyperlink using the iPad, but here is the URL

http://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=189406420A&KC=A&FT=D&ND=4&date=18940602&DB=EPODOC&locale=en_gb

... alternatively, go to http://gb.espacenet.com/
select "Advanced Search" and put GB189406420 in the "Publication number:" box.

Thread: How many T-Slots on a Rotary Table, 3,4,6?
06/12/2011 18:52:52
I agree that four slots look better than three, and also I believe four to be more practical.

My BCA mk III mill has a built-in 8" rotary table with four slots, and this is very satisfactory. ... Except on a very small table diameter, you would probably find the distance between three slots excessive.

It is also worth making adapter plates with linear tee-slots and/ or an array of tapped holes. ... I have one drilled to accept a 4" diameter four jaw chuck, which is very useful for small jobs.

MichaelG.
Thread: Ground or silver?
29/11/2011 21:22:16
Brian,

Silver Steel is high carbon [like gauge plate] and can be heat treated; but is tough to work.
Mild Steel can, at best, be case-hardened.

Silver Steel is usually "centreless ground" and can sometimes come out tri-lobed instead of round ... the diameter is constant, but the radius is not!

Precision Ground Mild Steel is typically just that.

MichaelG.
Thread: Choice of small milling machine
29/11/2011 20:08:52
Very probable that 200rpm is a realistic bottom limit, both for torque and heat dissipation ... although, as I mentioned earlier, the manual does indicate a range of 0-2500rpm.

I certainly think a little Epicyclic Gearbox would be the way to go.

MichaelG.

Edited By Michael Gilligan on 29/11/2011 20:09:34

Edited By Michael Gilligan on 29/11/2011 20:11:11

Thread: 3D Printing
29/11/2011 20:01:44
Robert,

That future may not be far ahead :-0
The RepRap project is worth a look

http://reprap.org/wiki/Main_Page

MichaelG.


Seriously though ... Whilst there are many uses for 3D printing,
I'm sure that traditional craftsmanship will be alive and well, in workshops all over the world, long after I'm gone.

Edited By Michael Gilligan on 29/11/2011 20:02:30

Edited By Michael Gilligan on 29/11/2011 20:03:03

Thread: Super 7 Going 3 Phase
29/11/2011 19:43:41
Les,

That looks a very useful Tacho design.
... Thanks for posting the link to it.

MichaelG.
Thread: Choice of small milling machine
29/11/2011 11:13:10
Initial response:
Two excellent points, Roger.

It would certainly be nicer to have a Brushless Motor; and hopefully that one comes under "continuous development".

Agreed, the lowest speed is a bit high, but that's probably a necessary compromise at this price point.
... Who will be first to design a little epicyclic gearbox for this one ?

MichaelG.

Updated:
The Parts List actually shows Part_120 as 500W Brushless Motor [not to be confused with Part_40 which appears to be wrongly described in the Parts List ... compare with the exploded view]
Page 8 gives the speed range as 0-2500 rpm
... It looks like a winner!

Edited By Michael Gilligan on 29/11/2011 11:24:42

Edited By Michael Gilligan on 29/11/2011 11:25:19

Edited By Michael Gilligan on 29/11/2011 11:34:53

29/11/2011 09:29:45
Daid Haynes,

Sorry, no experience of the Sieg SU1, but it certainly looks promising.

I did, however, find a PDF of the manual
http://s3.amazonaws.com/machinetools_production/uploads/1145397/SU1.pdf

MichaelG.
Thread: Making darts
27/11/2011 09:32:06
IanSC,

Presumably yes ... but it's more effective to start with the Tungsten mix [not strictly an alloy]; because its Specific Gravity is significantly higher than Lead.

A built-up construction would probably only weigh half that of the "Tungsten" one.

MichaelG.
26/11/2011 20:01:38
Steve,

These guys use the phrase "Readily Machinable"
http://www.mallory.com/datasheets/1300501.htm

[quote]
Unlike pure tungsten which requires to be machined at elevated temperature, tungsten heavy alloys can be machined conventionally, without much difficulty.
[/quote]

MichaelG.
26/11/2011 17:19:55
Rod Jenkins,

For balancing purposes, this might be worth a look
http://www.gamolagolf.co.uk/acatalog/Tungsten_Powder.html

... a drilled & tapped recess, with this powder inside, closed-off with a screwed plug or cap, would be neat and adjustable.

I'm guessing here, but; I suspect that the powder will be much cheaper [somewhere!] before it is re-packaged as a Golf product.

MichaelG.



See also: http://www.tungstenheavypowder.com/Tungsten_Heavy_Powder/Tungsten_Heavy_Powder_Products/MSDS-Tungsten_Powder.html

Edited By Michael Gilligan on 26/11/2011 17:24:44

26/11/2011 13:35:30
Neither of 'em will be obsolete while I can still become upright!


Tel,
Quite right too!
... my "obsolete" was just to acknowledge the comments recently received in "Blocks" thread

MichaelG.
26/11/2011 09:18:13
Oops, sorry

That should read
1/4" BSF and 2BA

MichaelG.
26/11/2011 09:15:22
... And they both turn out to be "obsolete" threads.

1/4 BSF and 0BA

http://www.reddragondarts.com/sec/126/1-4-BSF-Bubble-Shafts-4-00/

MichaelG.

[corrected below]

Edited By Michael Gilligan on 26/11/2011 09:24:31

26/11/2011 08:47:13
Guess what ?

There are [have been] at least two standards for the threads on dart flights.

http://www.a180.co.uk/shop/search.php?xSearch=shaft+thread&submit=Search



MichaelG.
26/11/2011 08:29:29
Tel,

Indeed it is; at least in terms of Diameter and Pitch.
... the Angle and Rounding of the Thread Form is different.

MichaelG.
26/11/2011 00:06:28
Mark,

I am no expert on darts, but they look like a very straightforward piece of turning ... and making a matched set will be a good exercise.

As for the lathe; nothing very special is required, except that it will be MUCH easier if you can hold the job in a collet chuck.

MichaelG.
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