a question from my metal exam

https://www.aulro.com/afvb/images/im...10/04/1653.jpg

and then you have an internal or a depth micrometer.i have used these out the back shed in the school so im going to get them and show him

Quote:

---

Originally Posted by schmierer LR at singleton

i agued the point and stated the 3 different types of micrometers and the teacher and the other students said no there is only one type.not a happy chappy.

---

You are correct.

Print these pages out and give them to the teacher.

You should get your mark. You were being more exact in your answer even though he, apparently, only wanted "micrometer".

Ask your teacher for a 0-25 micrometer and see what he gives you. ;)

Quote:

---

Originally Posted by p38arover

You are correct.

Print these pages out and give them to the teacher.

You should get your mark. You were being more exact in your answer even though he, apparently, only wanted "micrometer".

---

Err, delete the reference to the "yoghurt of an instructor" before showing him though eh? ;):D

If a world leader of precision measurment calls it an outside micrometer then its good enough for me. Take a copy of this and give it to your teacher.

http://www.mitutoyo.com/pdf/B.pdf

As for what things are called, things always get abbreviated take unbrako screw, its correct name should be a socket head cap screw, but everyone knows what your talking about when you mention the unbrako bolt.

Quote:

---

Originally Posted by schmierer LR at singleton

yes that was my answer and i got it wrong everyone else just wrote micrometer

---

You provided extra information. That doesn't make you wrong. I'm a teacher and always give credit to anyone who provides the answer and if I'm not sure about the extra information I always check before making a decision.
(Then I make a note to re-word the question for next year ...)

Quote:

---

Originally Posted by RR5L

As for what things are called, things always get abbreviated take unbrako screw, its correct name should be a socket head cap screw, but everyone knows what your talking about when you mention the unbrako bolt.

---

I call them socket head cap screws. :angel:

I've never known them to be call Unbrako screws (although I do have two sets of genuine Unbrako allen keys I bought in 1968).

The internal-wrenching hexagon drive ( to name it advoiding controversy) it is also know as an Allen head screw and by the old timers SPS screw because SPS was the first manufacturer of them on the early 1900's
The Allen name come after the Allen conpany which start manufacturin the screws circa 1940.s.

Cheers

You are definitely right with your answer and you should not be penalised for it with the loss of a mark. Push the issue further and request a change of marks.