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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: Wheel Cuting thin tooth?
14/01/2012 08:37:23
This is an interesting hypothesis; but it does beg the question as to how Peter subsequently managed to cut good wheels with the same set-up.

One simple test for Peter [in the absence of a ShadowGraph projector]
Try holding the cutter against several of the cut spaces in your bad wheel.
... if it is a snug fit, then we still have a mystery.
... if it is loose, then creep may be the answer.

One thought:
I note that the indexing arm is rather long and slender ...
Assuming that [to remove backlash] you are pre-loading with the typical "weighted string around the chuck" ... do make sure that you are putting that indexing arm in Tension, not Compression.

MichaelG.
08/01/2012 09:11:36
Well done, Peter ... and thanks for posting the evidence.

Despite your sucess; I'm sure this discussion will continue for a while ... and it will provide a useful reference for anyone that hits similar problems in the future.

MichaelG.
08/01/2012 09:00:48
Changing the diameter of the wheel does NOT alter the angular position of the gaps cut.


Billy,
... Yes, that's perfectly true.

MichaelG.
08/01/2012 00:23:21
Peter,

Assuming that you have confirmed the accuracy of your division plate ... Your first suggestion is, I am sure, correct.

The blank is too small [and/or you are taking excessively deep cuts; which ammounts to the same thing].
Either way; when you cut teeth to leave little or no "witness" on the tips, you are effectively working to a circumferential pitch, and the circumference is too small to accommodate the full set of teeth ... therefore the last tooth will be thin.

Try cutting another wheel without going full depth ... then measure it.

Good luck

MichaelG.


Thread: Homeworkshop
05/01/2012 08:44:37
Thanks, John
Welcome back.

MichaelG.
04/01/2012 22:04:41
Thanks both.

Hopefully "they" are aware of the problem.

MichaelG.
04/01/2012 20:02:53

If it's any help to the Techies; here is the error message that appears on the iPad


jtablesession:tore Failed
DB function failed with error number 145
Table './web110@002dadverts/jos_session' is marked as crashed and should be repaired SQL=INSERT INTO `jos_session` ( `session_id`,`time`,`username`,`gid`,`guest`,`client_id` ) VALUES ( '0cp5ukrqd9ghp382usjsl47rt3','1325707127','','0','1','0' )



... Which, I regret, means very little to me

MichaelG.



Please ignore the "emoticon" ... it's this forum doing a helpful translation of a colon followed by an upper-case S

Edited By Michael Gilligan on 04/01/2012 20:05:57

Edited By Michael Gilligan on 04/01/2012 20:08:25

Thread: NEW MAGAZINE FOR MODEL ENGINEERS
04/01/2012 09:32:34
For info ...

http://uk.linkedin.com/pub/clifford-almond-aciat/28/bb7/8b8
03/01/2012 22:40:50
There is an interesting Press Release on the web site.

http://future-structures.co.uk/

MichaelG.
03/01/2012 21:58:52
Further to Billy Mills' post (29/12/2011)

Companies House "WebCheck" is the place to look for details

... wherein; this is interesting ...
Nature of Business (SIC):
None Supplied


Nothing sinister in that, but it does go nicely with "Covert Crescent" doesn't it ?


Thread: resistance soldering unit -
30/12/2011 21:52:45
Ian,

Not quite an answer to your question, but:
"American Beauty" is worth a look, for info


http://resistancesoldering.com/site/

http://www.americanbeautytools.com/site/

MichaelG.

Edited By Michael Gilligan on 30/12/2011 22:01:36

Edited By Michael Gilligan on 30/12/2011 22:02:29

Thread: Morse Taper Removal
24/12/2011 22:34:36

This won't help those who have Morse Tapers on their milling machines, but:

The "correct" taper for the Mill is not self-locking. There are variations on the theme, but they are all much steeper than Morse, and therefore require only a light tap on the drawbar, to release them.

Edited By Michael Gilligan on 24/12/2011 22:41:25

Thread: Permanently bonding Aluminium
19/12/2011 15:25:13
Further to Ian's post ...
There is an excellent wikipedia article about Redux:

http://en.wikipedia.org/wiki/Redux_(adhesive)

MichaelG.
19/12/2011 08:37:29
If I recall correctly ... the Aircraft repair technique demands a Phosphoric Acid etch and dry, immediately before applying the Epoxy.
Phosphoric Acid is [or was?] the active ingredient in Rust Removers, like Jenolite, so that may be worth a try.
Simply abrading the surface is not really effective ... the Epoxy will eventually de-bond.


An alternative approach might be to use a few screws and a layer of Loctite 638, or similar. ... This acts more like a gasket than a true adhesive, but we had excellent results on vibration test fixtures.

MichaelG.
Thread: Was this the birth of CNC ?
15/12/2011 23:38:36
Neil,

There are some useful notes and references here:
http://www.cnccookbook.com/CCOrreryNotes.html

MichaelG.
Thread: Rotary table dividing Calculator
14/12/2011 13:43:30

For those who might be worried; Here is a very straightforward explanation of the problem:
http://forums.malwarebytes.org/index.php?showtopic=55343

[quote]
Mediafire is basically a P2P (peer to peer) file shareing program - As such the content will be always totally unknown to you -
There will always be an opening on these programs for infections to be placed in there without anybody knowing -
[/quote]

Basically;
John McNamara is a thoroughly decent chap, who shares clean files via Mediafire. ... But there may others who use Mediafire with ulterior motives.

Your AntiVirus is warning you about the inherrent risks associated with P2P file sharing.

MichaelG.
Thread: Was this the birth of CNC ?
10/12/2011 19:08:55
John,

As I admitted much earlier; my thread title was wrong.
... Unfortunately it cannot be changed.

I was so pleased to find the electrical sensing and feed, in that Taylor Hobson patent, that I wanted to share it.

It was neither NC nor CNC ... but interesting and, I thought, relevant.

MichaelG.
10/12/2011 18:07:24
Nice one, Richard

MichaelG.
Thread: Spur Gear Diff
10/12/2011 15:52:35
Bob D.

Fair comment ... but would that really cause much difficulty on a small-scale model?

The pedal racecar was oblivious to the problem: If you need reverse, you have probably already lost the race
Far more important to have drive to the appropriate wheel.

MichaelG.

Not Soldier of any persuasion, just an old motorcyclist
10/12/2011 11:06:27
John,

Thanks for starting this thread ... the discussion has been very useful.
There is one simpler alternative that you might consider:
It's not really a Diff, but does share some of the useful attributes. ... Put a freewheel on each side.

I believe this idea was used in some of the earliest Motor Cars, but my first acquaintance was when friends at 'Loughborough University of Technology' built a racing pedal-car [sometime around 1970]. This was a recumbent, with a central chain, and bicycle freewheel units each side.

As I said, it is not really a Diff ... but it works!

MichaelG.
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