What is an average vector trap/overlap for manuals? How about autos?

[Dottonedan]

Spawning from mpots recent post about underbasing a pin stripe. I thought it might be good to get a read on what the norm is for manual presses and how much you add in for registration shift (if any). Then the thought comes to mind, do Autos need to add in some registration shift also?  If so, how much?

Lets assume the stroke will be from the center vector line out.

[Inkworks]

How many thou. is a stroke?

[Dottonedan]

How many thou. is a stroke?

Sorry.  I'm not following the question.

[DannyGruninger]

We do 99% of our stuff on autos and I will say for us it depends on the size of the design. For full size files it ai we usually choke .75-1 pt and for say a left chest size we choke .25 pt. In psd it's a 1 or 2 pixel choke depending on size. So for us and I imagine most it depends on the size of design. I assume the same for most who do this type of outputting.

[Inkworks]

How many thousandths of an inch is a stroke? We don't work in strokes, but use thousandths of an inch for outline measurements. If a stroke is a point, then it's .014" but I'm not sure and can't find a reference online for a stroke.

[Rockers]

Depending on the art we choke by anything from 0.17mm to 0.3mm.

[Frog]

Depending on the art we choke by anything from 0.17mm to 0.3mm.

Is that about .5 pt to 1pt?

[Socalfmf]

zero and zero....just butt registration!

[Frog]

Dan, I was a little unsure of where to cast my vote.
On a manual, I shoot for .5pt overlap, so for an underbase in CorelDRAW, often use (and then knock out) a 1pt larger outline (that straddles)

In Photoshop, 1 or 2 pixels depending on resolution.

[Inkworks]

Lol, strokes, points, pixels, mm's, thousandths of an inch.

What gets me is it seems common in the US that mm's are used and up here in Canada

every shop I've been in uses thousandths of an inch.
 
I'm not sure what a stroke is,
a point is about .014"
a mm is .039" or almost 3 points
.17mm to .3mm is .007" to .012 or about 1/2 point to 1 point

If a stroke is a point we use .5 - 1  or about .007 - .015" where we can on the auto and the manual.

[Gilligan]

We were using .25 of a stroke on the outside (full .25), but I've don't like that sliver trying to peak out on some prints... So I suggested we start using .33pt.  I'm hoping once we go auto that we will be able to eliminate that completely like Sam is.

[ScreenPrinter123]

zero and zero....just butt registration!

So if you are printing say a yellow on black shirts you do not choke the white underbase at all? If so you have some mad skills!

[inkman996]

zero and zero....just butt registration!

So if you are printing say a yellow on black shirts you do not choke the white underbase at all? If so you have some mad skills!

The topic is not well defined. Damn is asking about trapping but everyone except Sam is answering about underlay choking. We do not trap ever not on auto anyways.

[Frog]

zero and zero....just butt registration!

So if you are printing say a yellow on black shirts you do not choke the white underbase at all? If so you have some mad skills!

The topic is not well defined. Damn is asking about trapping but everyone except Sam is answering about underlay choking. We do not trap ever not on auto anyways.

Dan did reference a recent thread about underbasing a medium thin line.
As for other trapping or overlay, for wet on wet colors touching, to reduce and delay the eventual muddying, I run no overlay, and, in fact, have even left a tiny gap (which fills in from subsequent screen offsetting) after a few prints.

[Gilligan]

Sorry, due to the reference I spoke about choke.

We trap a quarter point between colors most of the time.