# Sine Plate Charts - Someone lost the angle chart - Where can I get one?

J

#### jkittle

I need some help using a sine plate. I need to check the angle on a part and this is the only tool I have to do so but someone lost the angle chart that shows the gage block stack to use to get the angels.

Does anyone know where I can get a new chart or how to figure out what the stack up should be? I already googled the internet and can’t find a chart.

#### Stijloor

Staff member
Super Moderator
Re: Sine Plate Charts

I need some help using a sine plate. I need to check the angle on a part and this is the only tool I have to do so but someone lost the angle chart that shows the gage block stack to use to get the angels.

Does anyone know where I can get a new chart or how to figure out what the stack up should be? I already googled the internet and can’t find a chart.
Hello Jerry,

What is the length of the sine plate? Actually, you really don't need a table.
Your (gage block) stack height is equal to the sine of the desired angle times the length (hypotenuse) of the plate.

Hope this helps.

Stijloor.

J

#### jkittle

Re: Sine Plate Charts

Its 5" center line pivot. Please explain, my trig is a little rusty and I can't remember how to get the stack up.

#### Stijloor

Staff member
Super Moderator
Re: Sine Plate Charts

Its 5" center line pivot. Please explain, my trig is a little rusty and I can't remember how to get the stack up.
Jerry,

You need a scientific calculator.

Let's say the desired angle is 25 degrees.
The sine of 25 degrees is 0.382683432.
You multiply this by 5; your stack height is 1.913417162"

Also, making a gage block stack.

Hope this helps.

Stijloor.

J

#### jkittle

Re: Sine Plate Charts

Thank you very much for your help. I got it now and I feel really stupid too.

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