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Sine Bar Chart?

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RBnDFW

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Apr 7, 2010, 4:19:43 PM4/7/10
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Anyone got a simple chart or spreadsheet for a 5" sine bar?

Tim Wescott

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Apr 7, 2010, 4:22:52 PM4/7/10
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RBnDFW wrote:
> Anyone got a simple chart or spreadsheet for a 5" sine bar?

Isn't it just angle = arcsin(offset/5")?

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com

Mark Rand

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Apr 7, 2010, 4:39:41 PM4/7/10
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On Wed, 07 Apr 2010 13:22:52 -0700, Tim Wescott <t...@seemywebsite.now> wrote:

>RBnDFW wrote:
>> Anyone got a simple chart or spreadsheet for a 5" sine bar?
>
>Isn't it just angle = arcsin(offset/5")?


No, it's offset=sin(angle)x5

:-)

Zeus books have sines in, as do school tables books (if anyone still prints
them). Otherwise, pocket calculators or decent slide rules work...


Mark Rand
RTFM

Tim Wescott

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Apr 7, 2010, 4:41:26 PM4/7/10
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I did get that backwards, didn't I?

F. George McDuffee

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Apr 7, 2010, 4:47:15 PM4/7/10
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On Wed, 07 Apr 2010 15:19:43 -0500, RBnDFW <burkh...@gmail.com>
wrote:

>Anyone got a simple chart or spreadsheet for a 5" sine bar?

==========
Not to put too fine a point on it, but with the proliferation of
cheap scientific calculators with the sine function,
charts/tables are obsolete. Also you can use the calculator for
speed/feed/DoC calculations.
for some examples see
http://www.walmart.com/ip/Texas-Instruments-TI-30X-IIS-Scientific-Calculator/1535939
http://www.walmart.com/ip/Casio-FX-300ES-Scientific-Calculator/10248096
http://www.walmart.com/ip/Casio-FX260HA-Solar-Scientific-Calculator/10248095
http://www.walmart.com/ip/Sharp-Scientific-Calculator-Battery-Operated-Alphanumeric-Display-EL-531WBBK/10992485


Unka George (George McDuffee)
..............................
The past is a foreign country;
they do things differently there.
L. P. Hartley (1895-1972), British author.
The Go-Between, Prologue (1953).

Jim Wilkins

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Apr 7, 2010, 5:39:18 PM4/7/10
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On Apr 7, 4:19 pm, RBnDFW <burkhei...@gmail.com> wrote:
> Anyone got a simple chart or spreadsheet for a 5" sine bar?

I just made one for you in OpenOfficeCalc.

In cell A1 enter "1"
In cell A2 enter "=A1 + 1
Copy cell A2 and paste it downward to get all the angles to 90. Go a
little further to get some extra cells to enter custom angles.
In cell B1 enter "=SIN(RADIANS(A1))". This actually gives the sine of
the angle in degrees instead of radians.
Copy cell B1 downwards.
Format column B for 4 or 5 decimal places, one more than the
resolution of your gage block set.

As a check the sine of 30 is 0.5000, of 45 is 0.7071.
Go down to the last filled cell and change the angle to 14.5. The sine
is 0.250. That's supposed to be the reason for 14.5 pressure angle
gears, from way back when draftsmen drew them full size for pattern
makers.

In cell C1 enter "=B1 * 5", or whatever the length of your sine bar
is. Copy it downward and format the decimals.

jsw

RBnDFW

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Apr 8, 2010, 12:07:30 PM4/8/10
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Jim, that is perfect.

thanks much!

RBnDFW

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Apr 8, 2010, 12:09:14 PM4/8/10
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Tim Wescott wrote:
> Mark Rand wrote:
>> On Wed, 07 Apr 2010 13:22:52 -0700, Tim Wescott <t...@seemywebsite.now>
>> wrote:
>>
>>> RBnDFW wrote:
>>>> Anyone got a simple chart or spreadsheet for a 5" sine bar?
>>> Isn't it just angle = arcsin(offset/5")?
>>
>>
>> No, it's offset=sin(angle)x5
>>
>> :-)
>>
>> Zeus books have sines in, as do school tables books (if anyone still
>> prints
>> them). Otherwise, pocket calculators or decent slide rules work...

Hey, I'm the guy that flunked HS trig :)
Or more correctly, I bailed before I failed.

Jim Wilkins

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Apr 8, 2010, 12:23:54 PM4/8/10
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On Apr 8, 12:09 pm, RBnDFW <burkhei...@gmail.com> wrote:
> ...
> Hey, I'm the guy that flunked HS trig :)
> Or more correctly, I bailed  before I failed.

I flunked college technical writing, that was a practice exercise.

jsw

Wes

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Apr 8, 2010, 10:18:16 PM4/8/10
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Tim Wescott <t...@seemywebsite.now> wrote:

>RBnDFW wrote:
>> Anyone got a simple chart or spreadsheet for a 5" sine bar?
>
>Isn't it just angle = arcsin(offset/5")?

Tim, it is a sine bar. Not an arcsin bar. :)

I love Easy Calc that I run on my palm pda.

http://easycalc.sourceforge.net

sin(30)*5 returns the expected 2.5 as long as I tell it to use degrees and not radians or
gradians.

Wes

DoN. Nichols

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Apr 9, 2010, 1:41:33 AM4/9/10
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On 2010-04-07, Tim Wescott <t...@seemywebsite.now> wrote:
> RBnDFW wrote:
>> Anyone got a simple chart or spreadsheet for a 5" sine bar?
>
> Isn't it just angle = arcsin(offset/5")?

That is working backwards to ge the angle from the stack size.

If you want to calculate the (gauge block) stack size needed to
get a specific angle, try:

block_stack_needed = sin(angle) * 5

that is why they are called "sine bars".

If you have a scientific calculator (like my old HP 15C), you
have a sine function in there. Otherwise, pick up an old _Handbook of
Chemistry and Physics_ (or any of a number of other reference books) and
look for a table of sines which has sufficient digits to give you the
accuracy you need. Hmm ... old editions of _Machinery's Handbook_ also
have the sine tables. Newer ones have dropped that because of the
availability of scientific calculators. (Avoid BASIC in a PC, because
it probably does not have enough significant figures to do what you need
-- and it also probably is expecting the angles in radians, not degrees.
I'm not sure what precision a spreadsheet can give, but unless you can
at least ask for "double precision" calculations, forget it.

Enjoy,
DoN.

--
Email: <dnic...@d-and-d.com> | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

Jim Wilkins

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Apr 9, 2010, 5:44:34 AM4/9/10
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On Apr 9, 1:41 am, "DoN. Nichols" <dnich...@d-and-d.com> wrote:
> ....

> I'm not sure what precision a spreadsheet can give, but unless you can
> at least ask for "double precision" calculations, forget it.
>
>         Enjoy,
>                 DoN.

In OpenOfficeCalc 3.0, SIN(30) = 0.50000000000000000000

jsw

RBnDFW

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Apr 9, 2010, 10:41:40 AM4/9/10
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DoN. Nichols wrote:
> On 2010-04-07, Tim Wescott <t...@seemywebsite.now> wrote:
>> RBnDFW wrote:
>>> Anyone got a simple chart or spreadsheet for a 5" sine bar?

>

> If you want to calculate the (gauge block) stack size needed to
> get a specific angle, try:
>
> block_stack_needed = sin(angle) * 5
>
> that is why they are called "sine bars".
>
> If you have a scientific calculator (like my old HP 15C), you
> have a sine function in there. Otherwise, pick up an old _Handbook of
> Chemistry and Physics_ (or any of a number of other reference books) and
> look for a table of sines which has sufficient digits to give you the
> accuracy you need. Hmm ... old editions of _Machinery's Handbook_ also
> have the sine tables. Newer ones have dropped that because of the
> availability of scientific calculators. (Avoid BASIC in a PC, because
> it probably does not have enough significant figures to do what you need
> -- and it also probably is expecting the angles in radians, not degrees.
> I'm not sure what precision a spreadsheet can give, but unless you can
> at least ask for "double precision" calculations, forget it.

OK, found a iPhone free app calculator with trig functions.
that ought to be the ticket.

thanks

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