Dial Indicator Question

[Wreck™Wreck]

It goes into the body of a dial bore gauge for one use. Set the gauge using a setting ring or micrometer and zero the dial

 

[Swerdk]

Hi Swerdk,

If you go thru the Starrett website to choose an indicator here:
http://www.starrett.com/metrology/m...isplayMode=grid&itemsPerPage=24&sortBy=wp/asc
and select 0.0005" for Graduations and 0.125" for Total Range, you'll see they offer that indicator with either a "0-25-0" or "0-50" scale.

Compare it to this one:
http://www.starrett.com/metrology/p...tors-and-Gages/110503-Dial-Indicators/25-441J
that is graduated in thousandths (0.001") and has a range of 1 inch.

The Starrett site has a compare feature that lets you choose different products and pull up all relevant info on one page, like this:
View attachment 107497

One limitation of that indicator is its very small range. Notice how little of the stem is sticking out of the body?
You can only get 0.125" inch travel that's only 1/8 inch full range from it!
It is very accurate, but has a very small range.
It could be used for a soft stop, but really only useful for that if you are measuring less than 1/8" between features.

It is still useful, but I'd think more useful for closely checking for spindle run out, where you will (hopefully) be dealing with small numbers and very limited range.

-brino

Thats what i needed thanks

 

[uncle harry]

Hi Swerdk,

If you go thru the Starrett website to choose an indicator here:
http://www.starrett.com/metrology/m...isplayMode=grid&itemsPerPage=24&sortBy=wp/asc
and select 0.0005" for Graduations and 0.125" for Total Range, you'll see they offer that indicator with either a "0-25-0" or "0-50" scale.

Compare it to this one:
http://www.starrett.com/metrology/p...tors-and-Gages/110503-Dial-Indicators/25-441J
that is graduated in thousandths (0.001") and has a range of 1 inch.

The Starrett site has a compare feature that lets you choose different products and pull up all relevant info on one page, like this:
View attachment 107497

One limitation of that indicator is its very small range. Notice how little of the stem is sticking out of the body?
You can only get 0.125" inch travel that's only 1/8 inch full range from it!
It is very accurate, but has a very small range.
It could be used for a soft stop, but really only useful for that if you are measuring less than 1/8" between features.

It is still useful, but I'd think more useful for closely checking for spindle run out, where you will (hopefully) be dealing with small numbers and very limited range.

-brino

Another use is to tram in a lathe compound for turning a taper using a standard in the chuck. For example, to chuck or collet clamp a morse taper drill to produce that taper.

 

[bfd]

that dial makes it easier to track zero when you indicate something in a 4 jaw chuck bill