Question for the enginners, 0.0016mm - Page 2

IGH · 24th April 2020, 07:52

My god Zeus!!

I am looking at one sitting in the tray at the back of my desk as I type this.

Not sure but I think I got it a college, along with my slide rule and a set of log tables!!!!!!!!

What a magic book it was (is).

These posts made my day!!

Heddy · 24th April 2020, 08:59

In something like 40 years of engineering I've always used a 5mm as a tapping size for a M6 thread. Taps, as you may know come as a set of 3, taper, second and plug. The important thing here is always use tapping paste (or cutting paste) Most of the time I used a second tap to start with and a plug obviously in a blind hole. Even oil is better than nothing if tapping paste isn't available.

COLVERT · 24th April 2020, 19:27

WOW. This thread is a blast from the past. Takes me back to 1955/1960 during my five year apprenticeship as a tool-maker.
The factory has long gone and as I was, I guess, the youngest in the tool-room all the toolmakers and machinist have gone too.

I still have all the taps and dies though. Even my micrometre---

.

marinabrian · 24th April 2020, 20:10

My preferred cutting oil is Rocol RTD.

Anyway I've attached a PDF for Ian which he can print off and laminate for the future....perhaps tape it to the headstock of your lathe

I quite like Presto Counsellor, more for you to read

Brian

macafee2 · 24th April 2020, 21:43

Quote:

Originally Posted by marinabrian

My preferred cutting oil is Rocol RTD.

Anyway I've attached a PDF for Ian which he can print off and laminate for the future....perhaps tape it to the headstock of your lathe

I quite like Presto Counsellor, more for you to read

Brian

thanks Brian, I have a Zeus book. It has taken me a while to work out how to convert a fraction to a decimal inch which is a bit odd. Fraction and decimal how can that be? For some reason I knew 1/8th was 0.125
19/64 = 0.2968
19 divided by 64 = 0.2968
top number divided by the bottom number converts fraction to decimal.

I'm in a better place this evening to where I was this morning.

macafee2

Mike Noc · 25th April 2020, 06:38

Quote:

Originally Posted by macafee2

why 0.8? Never heard that rule of thumb.

macafee2

Well I've been doing it for years and it works or me.

It is a little tighter than ideal, but a very easy calculation.

Honestly can't remember where I picked it up from - probably at engineering college, but that was 45 years ago.

24th April 2020, 07:52	#11
IGH Avid contributor Rover 75 Saloon Join Date: Jan 2015 Location: Guildford Posts: 174 Thanks: 129 Thanked 48 Times in 21 Posts	Question for the Engineers My god Zeus!! I am looking at one sitting in the tray at the back of my desk as I type this. Not sure but I think I got it a college, along with my slide rule and a set of log tables!!!!!!!! What a magic book it was (is). These posts made my day!!

24th April 2020, 19:27	#13
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	WOW. This thread is a blast from the past. Takes me back to 1955/1960 during my five year apprenticeship as a tool-maker. The factory has long gone and as I was, I guess, the youngest in the tool-room all the toolmakers and machinist have gone too. I still have all the taps and dies though. Even my micrometre---.

24th April 2020, 08:59	#12
Heddy This is my second home None Join Date: Feb 2013 Location: None Posts: 5,556 Thanks: 465 Thanked 1,161 Times in 924 Posts	In something like 40 years of engineering I've always used a 5mm as a tapping size for a M6 thread. Taps, as you may know come as a set of 3, taper, second and plug. The important thing here is always use tapping paste (or cutting paste) Most of the time I used a second tap to start with and a plug obviously in a blind hole. Even oil is better than nothing if tapping paste isn't available.