LS29 Oscillation Settings

Does anyone out there that operates an LS29 know off hand what their oscillation degree setting is on each unit for the K,C,M, and Y?

Any help would be greatly appreciated, thanks.

 

Alibryan on a nl 28 you inch the machine to a spot where the front edge of the plate and blanket cylinders align (just behind the nip guard). this should be 0 degrees when you open the side inspection door. at this point the oscillator of the 4th forme roller should be completely at it's end range on the gear side. (or it may be all the way to the operators side, which means you just inch the machine 180 degrees). I sometimes get a "toning" mark on bond 80gsm paper 320-360mm down the sheet, in this case I advance the oscillation by 100 degrees.
I hope this makes sense.

 

@jetscreamer:

No toning problems just noticeable ink variation from grip to tail on most jobs. I know it's the nature of offset printing but wondered if there was maybe a setting on this particular machine that helps minimize the problem. I've always wondered about trying to bury the charge into the gap, but didn't know what degree would actually do that. And, if running all the units at the same degree, that might increase the noticeability instead of running them all different, so each unit appears different than the other.

 

Not sure if the inking train is different on a nl28 to a ls29 but I don't get any ink variation between grip and tail, (nothing visible by eye).
I run fairly light dot gain when I calibrate my process less plate setter this allows me to run reasonable col bars. vanson inks k=1.83. c=1.45, m=1.5 & y=1.5 on coated stocks. I also have a little oscillation on my 3rd and 4th forme rollers.

 

They're actually very similar ink trains, at least when you compare the position and number of rollers. I'm not sure if the oscillation is the same but it's likely that it is. I'm gonna try your recommendation and see what happens. So you run all 4 units in the same position?

Also, do you really run your yellow density at 1.50?

 

That is what vanson recommends for it's yellow, other inks I've run have been about 1.25- 1.3. but as you know we don't sell colour bars, so it's all subjective.
yes all units in the same position as per the manual unless I have any issues then I advance 100 degrees, If you like i can copy the relevant pages from my manual tomorrow and sen them to you?

 

That's really nice of you to offer. I'll let you know if I need it and thanks for the advice so far. I look forward to giving it a try and seeing what happens over the next few days. Thanks again.