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Metric to imperial

Quick conversion

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Paul Lousick06/01/2021 10:39:04
2276 forum posts
801 photos

My mental arithmetic is getting a bit rusty as the "old timers disease" is starting to set in and to do some of the maths above I would be reaching for a calculator.

But in the original post it stated::- " I work with metric drawings but my stumbling block is knowing quickly how much cut is needed to get to size without reaching for the calculator."

If converting dimensions from metric to imperial (and vice versa), I find it is much easier to convert them all and mark-up the drawings before you start machining instead of doing it while machining.  The actual converted dimension that you are using is recorded and can be used when measuring and checking the finished part.

Paul

Edited By Paul Lousick on 06/01/2021 10:47:40

not done it yet06/01/2021 10:45:29
7517 forum posts
20 photos
Posted by Michael Gilligan on 06/01/2021 08:23:38:
Posted by not done it yet on 06/01/2021 07:03:32:

how do you know quickly how many 0.025's there are in it.

Divide the number by 0.025.

[...]

.

Or, for much simpler mental arithmetic ...
[ which was, I think, the essence of the opening question ]

Multiply the number by 40

For example:

e01b33ad-6af5-46ed-ab5b-ae54858c88eb.jpeg

... As previously suggested by Steve.

.

MichaelG.

Edited By Michael Gilligan on 06/01/2021 08:42:49

I know, but the thread appeared to started by a mathematically challenged member who is unlikely to be doing mental arithmetic.🙂 KISS Principle in operation. The solution I presented, in simple form, works for any denominator one might come across so is a universal, not specific, solution.

Michael Gilligan06/01/2021 10:51:54
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23121 forum posts
1360 photos

dont know

The OP asked a specific question

Clive Brown 106/01/2021 10:55:45
1050 forum posts
56 photos

The OP's specific question seems to be at odds with the thread title.

Where's the imperial?

John Haine06/01/2021 10:58:26
5563 forum posts
322 photos

Many metric lathes calibrate the X slide dial in diameter not radius...

JasonB06/01/2021 11:14:47
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25215 forum posts
3105 photos
1 articles

It would be interesting to know what if any different lengths the division lines are and what if any numbers are on the handwheel as that may make it very easy to put on say a 0.3 cut if every 4th div is marked/longer and then it's just 2 and a bit divisions for the remainder.

Also what is the leadscrew pitch 2mm, 2.5mm or something else.

Or it may be better to treat each div as 0.05mm and work in diameter rather than radius

Andrew Johnston06/01/2021 11:19:47
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7061 forum posts
719 photos
Posted by John Haine on 06/01/2021 10:58:26:

Many metric lathes calibrate the X slide dial in diameter not radius...

So does my imperial lathe.

Andrew

Nicholas Farr06/01/2021 11:36:15
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3988 forum posts
1799 photos

Hi, well I just do it the easy way, I use a calculator and I'm not ashamed to say so. wink 2

Regards Nick.

not done it yet06/01/2021 13:46:00
7517 forum posts
20 photos
Posted by Michael Gilligan on 06/01/2021 10:51:54:

dont know

The OP asked a specific question

Sorreee, should have said ‘a universal, not just a specific, solution‘

Perhaps that would have kept you quiet, S?

Michael Gilligan06/01/2021 14:02:43
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23121 forum posts
1360 photos
Posted by not done it yet on 06/01/2021 13:46:00:
Posted by Michael Gilligan on 06/01/2021 10:51:54:

dont know

The OP asked a specific question

Sorreee, should have said ‘a universal, not just a specific, solution‘

Perhaps that would have kept you quiet, S?

.

I will be quiet after I have written this:

Your answer simply did not address the question ... which, for convenience, I am quoting here with emboldening of the significant points which you appear to have overlooked

[quote]

Hi all

I have a Denford Viceroy with metric leadscrews and graduations of 0.025.

I work with metric drawings but my stumbling block is knowing quickly how much cut is needed to get to size without reaching for the calculator.

For instance, say there is 0.73mm to come off halve it 0.365 (thats the easy bit) how do you know quickly how many 0.025's there are in it.

Regards

[/quote]

Telling a man who has asked that perfectly reasonable question to divide the number by 0.025 is, in my opinion, both patronising and crass.

MichaelG.

secret

old mart06/01/2021 15:08:25
4655 forum posts
304 photos

If you have a digital caliper to hand, it makes conversion easy.

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