Pressure : Depth on M&R Choppers

[244]

If your barrels aren't bottoming out to that 1.5 setting, then all of your press sheets are still valid.  It's only a physical stop, it doesn't change the pressure vs wide open, as long as it doesn't bottom out.

Now if it bottoms out then that's a different story, but you may have been lucky and have "accidentally" been running "wide open" all this time.

I just want to clarify that this is correct or not.  I already run my DB choppers so they do not bottom out, but if there is a reason to adjust them to fully open I will make sure I crank them all the way.

Crank them all the way up and forget they exist! They are only there to use if your press does not have squeegee regulator.

[ZooCity]

Hey Rich, can you help us out and confirm what "all the way up" is?  With the chopper in the up position what should the markings read? Thx!

[screenprintguy]

Hey Rich, can you help us out and confirm what "all the way up" is?  With the chopper in the up position what should the markings read? Thx!

allllllllll the way up, meaning, the deepest setting they could go till they are so tight they won't move anymore. like in the pics below

[ZooCity]

sweet, that's right where we're at.  Thx!

[Gilligan]

Yeah, chopping with them all the way up would mean that if the table is down the squeegee could likely bust through the mesh.

Did it on accident with some 225T mesh... glad it wasn't S mesh.

[screenprintguy]

Yeah, chopping with them all the way up would mean that if the table is down the squeegee could likely bust through the mesh.

Did it on accident with some 225T mesh... glad it wasn't S mesh.

On my press, they wont chopp down unless the table is all the way up, so that's never a concern. I've actually done a bad pallet line up before where the squeegee chopped off the edge, "with ink trapps on", no screen pop, but maybe that was just luck. I typically run our pressure with 40 pis, with s-mesh now Im down to 20-30 psi more in the 20 range for the most part. I'm not sure on other M&R models, but at least on the DB squeegees won't chop down unless table is up.

[jvanick]

Yeah, chopping with them all the way up would mean that if the table is down the squeegee could likely bust through the mesh.

Did it on accident with some 225T mesh... glad it wasn't S mesh.

how did you make the press do that?

I don't think there's even a way to make it happen on our new press...

our old beater press could and would do that tho, especially when the lift solenoid got worn out and it would sometimes stick.

[ threadjack ]
and I find it so funny that people freak out about smesh cost... it's only $4 extra per panel typically...  in the grand scheme of things, not enough difference in price for me to even care when I take into account how much easier it is to print with.
[ /threadjack ]

[Gilligan]

Yeah, chopping with them all the way up would mean that if the table is down the squeegee could likely bust through the mesh.

Did it on accident with some 225T mesh... glad it wasn't S mesh.

On my press, they wont chopp down unless the table is all the way up, so that's never a concern. I've actually done a bad pallet line up before where the squeegee chopped off the edge, "with ink trapps on", no screen pop, but maybe that was just luck. I typically run our pressure with 40 pis, with s-mesh now Im down to 20-30 psi more in the 20 range for the most part. I'm not sure on other M&R models, but at least on the DB squeegees won't chop down unless table is up.

That's about the pressures we run as well.

The Sabre has a function that allows you to chop at any time to make loading flood bars and such easier.  So when empty, you chop and that raises flood bars, then you chop back and load squeegee.  When I was first playing around with the press I did it at the wrong time.

[farmboygraphics]

This is a GREAT thread. I have also run pressures on our DB at 50 psi and notice the head flex and think to myself, that's got to cause some wicked wear on parts down the road. When running S mesh (another gold nugget picked up from here, thanks) I find I can lower the pressure to around 35. Just seems to me that as beefy as the heads are that they shouldn't flex like that or something is gonna give at some point.

[PylonPress]

This is a GREAT thread. I have also run pressures on our DB at 50 psi and notice the head flex and think to myself, that's got to cause some wicked wear on parts down the road. When running S mesh (another gold nugget picked up from here, thanks) I find I can lower the pressure to around 35. Just seems to me that as beefy as the heads are that they shouldn't flex like that or something is gonna give at some point.

I run fully open on my Diamondback (good to know I've been doing it right the past year)  but I also worry about the long term effect of pressure to high.  On average we us about 45-50 psi.   Almost never over 55 psi which is reserved for thick white inks and WB/DC.