I am looking for information on calibrating Sine Plates. If anyone has a procedure they can share, that would be great. If not, can someone point me in the right direction and give a shove? Thanks:notme:

This isn't my forte. Maybe one of the experts here can help with information on calibrating Sine Plates.

Hello jeremiah

I can't point to any calibration procedures, nor do I recall seeing any data on calibration of sine plates, but I think a quick brainstorm could yield enough data and considerations to provide a proper inspection of the sine plate.

The first question is: what do you use the sine plate for?

However, without a consideration of the tolerances to be worked with or the accuracy of calibration tools available, I think a simple procedure could be based on high-precision angle blocks.

These angle blocks are relatively cheap and are very useful.

I would do something to examine the cylindricity of the contact bars and their distance, and perhaps something to detect twist in the plate or displacement of the contact bars. Then, I would basically examine the plate for bumps and snags that could interfere with its plane surface.

You could do this with angle blocks. Set up 10, 20, 30, 40 degrees and at each step place the corresponding angle block on the sine plate. Sweep the top of the angle block with a test indicator and record the error in angularity as "full indicator movement." Accumulative error will indicate that the distance between the contact bars is not correct.

At all of these steps, move the gage block stack across the cylinder of the sine plate's contact bar to see if there is a detectable difference in angularity. This will detect cylindricity errors of the contact bar.

At all of these steps, move the precision angle block across the sine plate to see if there is a detectable warp.

There are so many more considerations, such as accuracy of calibration equipment, traceability of each piece of equipment in use, validating that a procedure is good for ANYONE's use, and amount of time it would take to create a proper procedure and then calibrate a tool with it...

Why not just send it out?

Ya

I also forgot to look at MIL-STD-120 which has a ton of info about sine plates and calibration of.

I highly recommend a free registration with http://assist.daps.dla.mil/ (http://assist.daps.dla.mil/) for access to ASSIST, MIL-STD-120 is in PDF data format and searchable.

Test procedure and acceptance norms for Sine Bars are indicated in
DIN 2273.We,in India,follow an equal standard IS-5359.This standard gives all the details of Sine bars.

S.A.Rasheed

Basically you measure the flatness end to end. The paralellism side to side. And the distance between the rolls. I also set the UUT to 15 deg using the appropriate gage blocks, then place an inverted 15 deg master angle block on it. Lastly measure the flatness of the bottom of the angle block.

Use a gage amp, height gage and a AA surface plate.