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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: Help with odd milling machine spindle taper
19/11/2019 20:49:43

All sorted now ... Panic over


19/11/2019 17:12:44

Can somebody [perhaps a moderator] please help me here ?

I clicked on ‘Message member’ and sent a note to IanT

... but received the following reply:


Hallo Michael - I think you may have sent this to the wrong "Ian" (or some such).




Surely we can’t have two members with the same account !!


19/11/2019 13:24:44
Posted by IanT on 23/05/2019 13:25:38:


I have a .png drawing of the NS taper (which also includes the 30/40/50 tapers) and gives their relative dimensions. The 'G' measurement - the top end of the taper, for the NS taper is 1.375" which is 34.9mm - so this seems to suggest this taper.

I cannot post .png images here but if you pm me - I will email you the image.





if you eMail the .png to me, I can easily convert it to .jpg and post it here

I will send you a PM with my address


Thread: Lathe belt broken
19/11/2019 13:11:49
Posted by BOB BLACKSHAW on 19/11/2019 11:16:22:

Thanks Michael,

Ive looked at the photos and its non of those, mine has a complete split.

The photo is rubbish , cant get close for a good photo.


My apologies, Bob

... at the price quoted, I wrongly assumed that it was a Gates timing belt you were breaking.

Please ignore my input.


19/11/2019 10:15:45

This [from the horse’s mouth] might help, Bob : **LINK**


Thread: Lathe boring tool - top rake?
19/11/2019 09:47:06
Posted by SillyOldDuffer on 19/11/2019 09:21:58:

Negative rake cutters are stronger, last longer and use less power than positive rake types. […]

Positive rake cutters are weaker, blunt faster and use more power to remove a given amount of metal than negative rate types. […]


I would be grateful if you could explain that, Dave [my emboldening]

My little brain is screaming “Does not Compute”
... but perhaps it is thinking of saw blades


Thread: Cold Blue
19/11/2019 09:34:08

Thanks for that, Lainchy ... I’ve already ordered some, anyway.


Thread: Precision Tool Vice Type 2
19/11/2019 08:23:08

Digressing slightly: When I worked in the vibration test lab, we used cap-head screws down deep counterbores in the alloy ‘head expanders’ on the shakers. ... These were always used with properly engineered thick plain washers [which I believe to be a standard commercial product].



Edit: The general style is shown in the second image on this page

... but we typically used M8

Edited By Michael Gilligan on 19/11/2019 08:34:44

19/11/2019 08:06:43

I’m bewildered, Phil

Is this the vice to which you refer ? : **LINK** ?

... if so, it would appear that all you need is a thicker [and/or better fitting] washer under the screw-head.




Edited By Michael Gilligan on 19/11/2019 08:14:10

Thread: Macgregor digimac transmitter receiver crystals 3
19/11/2019 07:33:46

Excellent logic, Sir



P.S. I just looked back at your first post [in 2014] and note that the link appears to be dead

In the spirit of what you have done on this thread ... is the resource still available ?

Edited By Michael Gilligan on 19/11/2019 07:38:05

Thread: Cold Blue
19/11/2019 07:24:05
Posted by Lainchy on 18/11/2019 23:01:02:

Just found this thread... I was interested myself in some bluing, mainly for small tools I make.

...found Abbey Blu Gel on eBay, less than £10 which is what I wanted to spend. I'm not saying it's the answer to all bluing... but for small items, it worked for me.

Clean the part well with 99% IPA... coat, wait, rinse. Repeat 3 times. Works well and is dead easy.


That sounds very promising ... Thanks for the reference.

I realise that this is a rather subjective question, but:

How durable would you say it is ?


Thread: To pin, or not to pin
18/11/2019 22:08:48

Nice demonstration, Andrew ... Results as expected. yes

The only ‘question’ is: How likely is it that, in any foreseeable circumstances on a machine tool, the whole joint would get temperature-soaked to 300°C ?


Thread: Mitutoyo DRO Fault
18/11/2019 10:28:14

No problem, Nick

It was the ‘No fix, No fee’ offering that first attracted me.

i’ve never had cause to use them, but assume that you have.


18/11/2019 09:38:44

Posted by Michael Gilligan on 16/11/2019 22:27:23:


Edit: If all else fails, it might be worth trying here



Mmm ... deja vu

Thread: What G-code to use?
18/11/2019 09:28:54
Posted by Gary Wooding on 18/11/2019 07:45:03:

Thanks Michael, I got some useful stuff from your searches. Unfortunately, the second link you supplied, the one ending in "/EN/Download.htm" doesn't load on my system (Firefox Win10); no error, just a blank window.


You’re welcome, Gary

Here is the window that you should be seeing [grabbed on the iPad just now]


If any of those documents would help ... Please send me a P.M. with your eMail address and I’ll try downloading them for you.


Thread: Grand Piano Bolts - 6.6mm x 22tpi
17/11/2019 15:51:55
Posted by Mark Elen 1 on 17/11/2019 15:08:51:


Only snag is, 5/16 BSF major diameter is 7.9375 mm


But a BSF chaser would be reasonably agnostic regarding diameter.



P.S. ... I must echo Ian’s congratulations !!

Thread: What G-code to use?
17/11/2019 11:01:25

Not sure [because it’s way out of my league] ... but I think everything you need to know is in here:




But there’s more available here:

Edited By Michael Gilligan on 17/11/2019 11:09:07

17/11/2019 10:23:58


This page mentions C-Tek **LINK**

... is that any help ?



Edited By Michael Gilligan on 17/11/2019 10:26:07

Thread: Mitutoyo DRO Fault
16/11/2019 22:27:23
Posted by Brian H on 16/11/2019 19:56:13:


Thanks Ian, I used the term 'amplifier' because that's what Mitutoyo calls them […]


Intrigued by that revelation, I found this document: **LINK**


Which incidentally includes this gem, on page H-15

*1: The exact value is 0.0048828125μm since the 20μm signal is divided by 4096.

Humbling, is it not ?



Edit: If all else fails, it might be worth trying here


Edited By Michael Gilligan on 16/11/2019 22:31:00

Thread: Watchmakers lathe
16/11/2019 22:05:28


Bob gives good advice yes

The 6mm, 8mm and 10mm sizes are most common, although I do have one [Boley design] with 6.5mm collets.

In all cases the measurement refers to the body diameter of the collets.

Numbers on the front of the collet refer to the bore, in tenths of a millimetre.

Beware though, there are many different threads for the draw-tube.



The tabulation on this page was published in several books, and remains a useful reference:

Edited By Michael Gilligan on 16/11/2019 22:14:56

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