Types of screws--technical reason for difference??

[LittleWatchShop]

Here is a drawing of two screws which are identical except for the little tit at the bottom.

What is the purpose of the tit, and where do you see it most often used on a watch movement?

[watchweasol]

Hi  quite often see them on the balance cock and pallet cock, I assume the tit is to guide the screw into the starting point of the thread keeping the screw upright making it easier to start. .

[rodabod]

What WW says. Very handy, especially on smaller screws where there is little to aid guiding the screw into alignment.

[jdm]

1 hour ago, LittleWatchShop said:

Here is a drawing of two screws which are identical except for the little tit at the bottom.

Out of curiosity, is it normal to refer to something like this as tit in the US and UK? The online dictionaries give different meanings.

[LittleWatchShop]

20 minutes ago, jdm said:

normal

Not sure what is normal.  It would be understood over here.  I suppose another term would be "nipple."  What would you call it?

[rodabod]

Tits is more often used to describe breasts, so people would often use a different term, like nipple, even though it has similar connotations.

[watchweasol]

Axels and joints , hubs etc have nipples for the grease gun, the colloquial term was tit,  or projection to give it its correct term.  The name Tit can be equated to the titmouse and the birds of the same ie Blue tits  great tits coal tits, the expression a "right tit" means a complete Idiot so it can be manipulated to mean several different things.  English Language? 

[Klassiker]

Dog or dog point. Am I the first in this thread not to mention tits, breasts, nipples or cocks?

[Marc]

9 minutes ago, Klassiker said:

Am I the first in this thread not to mention tits

Quite possibly. I would refer to the said protrusion as either a pip or a spur (or indeed a protrusion)

[LittleWatchShop]

Here is support for "dog"

[clockboy]

3 hours ago, jdm said:

Out of curiosity, is it normal to refer to something like this as tit in the US and UK? The online dictionaries give different meanings.

[TimpanogosSlim]

Half dog. To prevent peening. 

[oldhippy]

Dog screws are used to hold something in place. 

[Klassiker]

2 hours ago, oldhippy said:

Dog screws are used to hold something in place. 

Screws in general are used to hold something in place, aren't they? You mean as a set-screw? That's one use. Watchweasol und rodabod are right in saying it's for alignment when fitting.

[oldhippy]

The end flat of the screw should hold what ever it is touching tight, is what I meant to have said. 

[nickelsilver]

21 minutes ago, Klassiker said:

Screws in general are used to hold something in place, aren't they? You mean as a set-screw? That's one use. Watchweasol und rodabod are right in saying it's for alignment when fitting.

In the case of watch screws with this feature yes it's to help the screw go in its hole. But dog screws use the tip to hold something in place, like on lathe toolholders.

 

 

[spectre6000]

I feel like tit/nipple has a regionality to it in the US as well. I heard "tit" quite a bit down in Texas, which is its own region (and multiple regions in one), but tends to trend with the American South. I might be able to narrow that down a little further to East Texas, which trends even more closely with the American South. In Colorado, I don't think I've heard something like that referred to in that way, and typically "nipple". I'm located on the border between the US midwest and mountain west regions, and if I had to ascribe that to one or the other, I'd guess midwest for their overly (annoyingly)... puritanical for lack of a better word mannerisms and maybe tit is slightly naughtier than nipple. Though I could be giving the Mormons over in Utah less credit than they're due. Or maybe more...?

My personal vernacular tendencies would have me call it (and this is how I rephrased it in my head as I read it for the first time before learning the direction the thread went) a "feature" with the same relative spacial description as above. But I'm a freaking weirdo living in isolation up on a mountain somewhere, so my vernacular is almost entirely inner monologue anyway, and couldn't correctly be called a manner in which anyone speaks, not even me.

[jdm]

4 hours ago, nickelsilver said:

 like on lathe toolholders.

That is a unjustified showoff of vintage machinery part. For this infraction your fine will be 1 pound and 3 shellings, plus 5 pence for each square head screw. Times 2 because isn't even your own.

 

32 minutes ago, spectre6000 said:

I feel like tit/nipple has a regionality to it in the US as well.

Please let me know on which YouTube videos you make linguistic comments because I need guidance on that as well on all the funny speeches.