Ever seen one of these?

[Tungsten dipper]

I’m looking for a chart to tell me what taper I’m measuring



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[outlawspeeder]

Neat way to measure an angle. The left looks like a sine bare. Only guessing

[Mcgyver]

is that yours? nice find. I've only ever seen photos of the mythical taper mic, they are fairly rare. (also thought it would make a good project)

It is a sine bar. Measure the distance between pins, dollars to donuts it'll be to some round number like an inch, then its the standard sine bar formula sine of the angle = mic reading / distance between pins.

[old mart]

It looks like it is made by a toolmaker, probably using the frame of an old 3-4" Mitutoyo mike.
The exact pitch of the pivots would be essential for the calculations.

[boslab]

is that yours? nice find. I've only ever seen photos of the mythical taper mic, they are fairly rare. (also thought it would make a good project)

It is a sine bar. Measure the distance between pins, dollars to donuts it'll be to some round number like an inch, then its the standard sine bar formula sine of the angle = mic reading / distance between pins.

Ohh a sine mic, used to check the taper on tiny unicorns prongs, rare
Mark

[alanganes]

If you scroll down to post #8 in this thread you will find a chart for one of these tools that has a 1" sine bar:

https://www.practicalmachinist.com/vb/general/does-anyone-have-paperwork-taper-mike-taper-micrometer-336603/

In any case, it's easy to make up a cart on a spreadsheet once you are sure of the length of the bar if you would prefer to not have to do the calculation each time you use it.

Cool gadget, first time I've heard of such a gadget.

[Tungsten dipper]

It's actually built on a National frame and the sine bar is on 1" centers; this one of many precision measuring tools I picked up, yesterday from my Dad's estate. 15 different mics (including 3 Etalons), 6 indicators, gauge blocks, broach set, chucks, and etc. Christmas came early!!

[Tungsten dipper]

If you scroll down to post #8 in this thread you will find a chart for one of these tools that has a 1" sine bar:

https://www.practicalmachinist.com/vb/general/does-anyone-have-paperwork-taper-mike-taper-micrometer-336603/

In any case, it's easy to make up a cart on a spreadsheet once you are sure of the length of the bar if you would prefer to not have to do the calculation each time you use it.

Cool gadget, first time I've heard of such a gadget.

THANK you!!!

[3 Phase Lightbulb]

I’m looking for a chart to tell me what taper I’m measuring



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Did you sand blast the frame? It looks like it was sand blasted.

[Tungsten dipper]

That's the way I got it.