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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: Hardening gauge plate (O1)
28/09/2021 08:04:31

Whilst I am perfectly happy to accept Sam’s practical success … I think this needs saying:

There is a big clue in the name of the material : The ‘O’ stands for Oil

Sadly, I note that even this page appears to use ‘0’ in several places **LINK**

crying 2


Thread: Not enoughh CO2 ?
27/09/2021 23:37:50
Posted by Paul Kemp on 27/09/2021 23:32:15:

With respect it was a genuine question. However you want to 'play' with fits of the curve the data sets themselves still show a significant trough around 1910 and a significant peak around 1942. You could manipulate the curve according to the data for the trough to be a little deeper and the peak to be a little higher but it's fine as presented, it still shows a larger short term variation than the period of reasonably steady increase say 1962 (ish) to present? Given the efforts to eradicate CFC's over the last 10-20 years coupled with efforts to reduce CO2 certainly over the last 10 years there is no real hesitation in the rate of rise. Hence my question.



There is no need for ‘respect’ Paul … I wasn’t attempting to address your question.

I was simply pointing-out [as Dave had not done so] where the data could be found.



Edit: __ I do try to make it clear to whom I am responding, and in that instance it was not you

… I quoted Dave’s post, not yours.

Edited By Michael Gilligan on 27/09/2021 23:44:43

27/09/2021 23:02:15

Posted by SillyOldDuffer on 27/09/2021 14:05:15:


This graph shows global temperature to be rising and is cause for concern because it appears to be accelerating in line with theory, which is bad, bad, bad for everyone.



Credit where credit’s due … Here’s a link to the NASA page : **LINK**

… and a quick reminder of Lowess smoothing : **LINK**



P.S. __ if you want to play with different fits, the data table can be downloaded using the link below the Xaxis

Thread: Macro-photography
27/09/2021 20:49:50

... It's just a nice size to work with the little Russian Industar 50mm f3.5 lens, so it was temporarily affixed with three blobs of BluTack [!]

Closest focus of the Industar is nominally 0.65m, and this reduces it to about 0.45m

These two shots are thoroughly boring, but nicely demonstrate the performance:


With aperture = f16




With aperture = f3.5


Not bad for a 120 year old


Edited By Michael Gilligan on 27/09/2021 20:52:12

27/09/2021 20:40:30
Posted by Michael Gilligan on 22/09/2021 22:43:00:

Rummaging about in a box of odd lenses, today ; I rediscovered an old close-up lens of considerable age

[ blah, blah, blah ]

… I must try taking some test-shots



Time passes ...

First here are a couple of shots of the close-up lens:







Edited By Michael Gilligan on 27/09/2021 20:50:40

Thread: cutting spur gears on a mill
27/09/2021 19:32:19

I'm impressed, Brian ... "here are some data"

At last someone who knows that the word is plural



Thread: CNC Lathe Scratch Build
27/09/2021 18:03:17

Did the brief paper that I linked miss the point completely ?

… Just trying to learn a little from your adventure.


Thread: Chatter/finish problem
27/09/2021 17:59:42
Posted by Steve355 on 27/09/2021 15:37:56:
Posted by Daggers on 27/09/2021 12:37:48:

I rebuilt a machine similar to yours and when i adjusted the collar you show a much more experienced friend instructed me to put a 0.001” feeler gauge between the cast face and the collar face then tighten the locking screw. This allows the spindle to run free but with minimum end float.

Work just fine for me.

Good luck.

That’s really interesting. Looking at mine closely, it isn’t quite like that. The bronze or brass “sleeve” in the bearing is actually slightly wider than the bearing and so protrudes by about 1mm on both sides. The edge of the “collar” is actually chamfered, so it doesn’t ever actually contact the cast iron, if the sleeve is secured properly by the grub screw.



I’m back angel

That new picture makes much more sense than the one that I was commenting upon earlier

… You actually have something appropriate against which to adjust the collar

… Go for it !!


27/09/2021 11:55:49
Posted by Steve355 on 27/09/2021 11:25:46:
Posted by Michael Gilligan on 27/09/2021 10:30:52:


It looks like there is a thrust bearing assembly missing !


I don’t think so. I think it only has a thrust bearing (if that’s the race bearing parts) at the chuck end. The gears end just has the brass sleeve. I’ve watched some YouTube videos of others refurbing the headstock of this lathe (Zyto) and it is the same as mine. And I am 99% sure the paint is original…..


Fine … it was only a guess, based on the available evidence blush

It all looks wrong to me; but sorry I cannot be of any assistance.


27/09/2021 10:30:52
Posted by Steve355 on 27/09/2021 10:21:28:

Hi all

Warning - over enthusiastic novice alert!

Ever since I got my lathe a couple of months ago, […]


And it doesn’t look as though that collar is designed to run against the face of the second bearing (which is painted). So I’m not really sure how to secure the longitudinal travel of the spindle correctly.


It looks like there is a thrust bearing assembly missing !

You mention a painted surface … could that possibly have been a ‘touch-up’ paint job ?


Thread: It’s time for a happy ‘Dog story’
27/09/2021 10:12:39

With all the bad News that’s about … this is [on several levels] a wonderful story:


Happy Monday



Edit: __ oops, I used those fancy quote marks  in the thread title again.

Edited By Michael Gilligan on 27/09/2021 10:14:47

Thread: Hardinge HLV H
27/09/2021 09:07:30

With apologies for quoting myself blush


It is worth noting how small an angle 'one second of arc' really is.

As a sanity-check; make a little target with a 1mm wide line on it [when I did this, I just filled-in alternate spaces on a section fom an IKEA paper tape-measure] ... Then view that target at a distance of 206.265 Meters. ... At that distance, 1 second of arc is subtended by 1mm.



Ref. __

Edited By Michael Gilligan on 27/09/2021 09:08:37

27/09/2021 08:15:58
Posted by David Colwill on 27/09/2021 07:20:25:

I believe that there is a difference between the British and American built machines. The British Machines have a 4 degree taper as opposed to the 3 degree 59 minute 30 second of the American machines.

Not a problem if you are working to the taper on your machine.



As a ‘bystander’ I find that intriguing, David … especially in light of the manuscript change on the drawing that Fernando posted.

I wonder what the tolerances are

…. Many lesser firms would probably struggle to keep within thirty seconds of arc !


Thread: Multimeter recommendations
26/09/2021 22:20:52
Posted by roy entwistle on 26/09/2021 19:55:08:


the Trade Mark is a sea horse surrounded by Instruments for land sea and air



Rendar also did a 13A style (but fused 5A) mains plug, with clips inside

insta-power test adapter


Thread: CNC Lathe Scratch Build
26/09/2021 21:38:42


It’s way out of my league … but I just remembered downloading this a while back: **LINK**

… It may be of more use to you than it has been to me blush


Thread: Electric motor and control
26/09/2021 17:28:25

That looks tidy, Clive yes


Thread: Saving the Planet … or is it ?
26/09/2021 17:02:19
Posted by Tony Pratt 1 on 26/09/2021 16:09:40:

CCGT OCGT, no idea what they mean so your clever post is lost on me😴



As stated earlier, Tony …

There’s a surprisingly succinct review of advantages/disadvantages here: **LINK**


Thread: Aluminium Oxide Mount Point Grinding Tools
26/09/2021 13:54:52

‘professional’ is one of the most abused and ambiguated words in the English language

… best summarised [in my opinion] as ‘does it for money’


Thread: cutting spur gears on a mill
26/09/2021 13:45:39
Posted by Pete Rimmer on 26/09/2021 11:19:00:
Posted by ega on 26/09/2021 11:13:25:

In trying to answer my own question about Brunel, I found a chapter […]

I have a paid-for reprint of this fascinating work but do wonder if it is lurking somewhere gratis on the internet!



A fascinating read and the archive version is handily scanned so as to be searchable. […]


Thanks to both of you yes

Given the origins of many ‘engineering’ developments:

I was mildly amused by the Author’s connection with the ‘Museum of Peaceful Arts’


26/09/2021 10:12:20


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