Vernier Caliper question

[eveled]

Lots of smart old school people here. Hoping one of you can shed some light on this.

My caliper has a 1/1000 inch scale. Not a 1/128 scale.

The vernier scale on my calipers goes to 40. Every other one I've seen goes to 25.

So on the main scale I have to count up by .040 not .025

Is there a specific purpose for a "40" caliper?

A picture of a "normal" one from ebay for comparison

 

[JAYDAWG]

WATERTENDER?!?!??!????......
Help

 

[GoBow]

Is the "40" caliper metric?

 

[Chief 101]

I have the same one in another brand and see that W has it figured out.

 

[Watertender]

WATERTENDER?!?!??!????......
Help

A 25 and 40 caliper is the old standard vernier. Each inch is divided into 40 with the 25 being the scale it's read on. A 50 and 20 is easier to read because the scale markings are farther apart. The old Starrett 122 vernier is a 25 and 40. The Starrett 123 is a 50 and 20. It takes time to learn how to use one properly. I have both but prefer a dial caliper.

The 10 scale on top is metric while the bottom scale is standard.

There are 25.4mm per inch and 1mm is .0394". Your metric scale is divided into 1/10 of a mm with 1/2 of a mm between the graduations. The top caliper is easier to read than the other one.

 

[JackBull]

Top scale is inches, bottom scale is metric.

 

[sceva]

Top scale is inches, bottom scale is metric.

Reverse that; if you look closer you will see that the 1, 2, 3 etc are at much shorter increments (centimeters) with 2.54cm or 25.4mm falling at the inch tick


I read it a 1.882

 

[JAYDAWG]

A 25 and 40 caliper is the old standard vernier. Each inch is divided into 40 with the 25 being the scale it's read on. A 50 and 20 is easier to read because the scale markings are farther apart. The old Starrett 122 vernier is a 25 and 40. The Starrett 123 is a 50 and 20. It takes time to learn how to use one properly. I have both but prefer a dial caliper.

The 10 scale on top is metric while the bottom scale is standard.

There are 25.4mm per inch and 1mm is .0394". Your metric scale is divided into 1/10 of a mm with 1/2 of a mm between the graduations. The top caliper is easier to read than the other one.

Told ya...............WT is THE MAN,
Which is amazing, since he lost all his marbles
Cheers,
JAYDAWG

 

[Watertender]

Told ya...............WT is THE MAN,
Which is amazing, since he lost all his marbles
Cheers,
JAYDAWG

You want metric or standard size marbles? I have both...

 

[krw]

I usta hav to read venier caliper. When dial calipers came out it was a Godsend!!

 

[Watertender]

Great basic measuring set. This is one that I use at work sometimes. I have a different set for lining up blowers and pumps. I am particular about my tools and doing the job properly.

 

[HumphreyDaBear]

Great basic measuring set. This is one that I use at work sometimes. I have a different set for lining up blowers and pumps. I am particular about my tools and doing the job properly.
View attachment 51292

Sure avoided that need for batteries I see. I prefer vernier and dials over digital myself. Though I do admit, with what I do, when it comes to finding position on numerous diameters, a MicroHeight is hard to beat, even over a CMM(quicker fixturing).

 

[JackBull]

Reverse that; if you look closer you will see that the 1, 2, 3 etc are at much shorter increments (centimeters) with 2.54cm or 25.4mm falling at the inch tick


I read it a 1.882

Got it duh!

 

[WanderLust]

It's a device for use with .40 caliber parts only?.....

 

[eveled]

I just got these off of ebay to play with. They have 2 vernier scales not on my other caliper.