Problem with cutting accuracy after print.

[Chris Wool]

measure the print and the cut which one is wrong my guess is the print

[Jason Bagladi]

If it was the print, wouldn’t the cutter have problems picking up the registration marks?

[Martin Pearson]

Jason, this has been mentioned before in a previous post. See if anything here helps you.

https://www.uksignboards.com/viewtopic.p … 35&start=0

[John Parfit]

Thanks all, not replied till now because been in unit but forgot my password to log in from new pc.

No, print is fine Chris, it’s the cutting that is out, seems by about 5mm over 1.2 metre either across or feed.

Tried again Mimaki print/cut, was perfect so it’s what is coming from Onyx/ Onyx cut server… can’t find any adjustment though.

Tried cutting from Onyx as generic cutter instead of mimaki – same bad result.

Tried marking with a pen a reg mark 5mm in but it cut the same bad result even though it recognised the false reg mark. (?)

Bloomin annoying since I’ve now built up about 15 metres of printed stuff to cut but dare not put it through until I get it sorted .

John

[John Parfit]

Not the same Martin I’m afraid, this is not bowing but the cutter is cutting further and further out of alignment as it gets further from the origin, both x and y axis.

John

[Chris Wool]

only thing i can think of at the moment as you say the cut area grows is the distance from the print or eps border to the marks, on rolands software the cut path WILL be altered to fit the marks.
is the first part of the cut nearest 0.0 in the correct place.
and is the error distance of the cut the same in both feed and scan.
and is the error as if the cut path has been expanded (stretched)

[John Parfit]

Yes, all of these things you mention Chris 0:0 origin is correct but the cut path is stretched in both x and y axis away from origin in proportion to distance from origin.

I don’t understand what you are saying relative to your Roland Chris that the cut will be altered to fit the marks, what is the point in altering the cut relative to the marks if it results in an incorrect cut? Having said that it seems the most likely explanation of what is happening even if I don’t understand it.

In the Onyx rip and add on cut server their is nothing that you can get to to alter or view things as I can see. During setting up the print/cut I tell the rip that I shall be cutting with a mimaki (already installed) and it automatically creates registration marks around the print (can’t even find more complex mark set ups for long prints or stickers).
So either the reg marks are wrong or information sent to the mimaki or translated by the mimaki is wrong (is their a language difference hpgl > hp.. something else?).

Thought of a work around in the night 🙄 ; Use finecut (mimaki cutter software) to make mimaki/rasterlink reg marks, send these to print on the HP but do not engage print/cut; cut the print via rasterlink pro5 not onyx using the finecut reg. marks.

Can’t wait to try it but can’t wait also for HP tech to tell me the proper fix, bet they tell me it’s the mimakis fault :lol1:

Thanks again Chris

John

[Chris Wool]

quote :

Thought of a work around in the night ; Use finecut (mimaki cutter software) to make mimaki/rasterlink reg marks, send these to print on the HP but do not engage print/cut; cut the print via rasterlink pro5 not onyx using the finecut reg. marks.

sounds like a plan

is the cut path defined in the print file or a separate file sent latter.
in the past when had a spot of bother i surround the finished artwork with a black hair line to define the border more accurately and duplicate a cut path on top of the boarder the knife should go down the printed hairline.
that way the cutpath is locked within the print area nothing else can move it.
and leaves you with a weed box.
some things i do have a window cut before laminating and cutting to final shape. as that requires two files on top of one another.

the whole idea of the 4 marks with the top end cutters is it defines an area that should equal the printed area, and creates a new 0.0 if laminated the material is now twice as thick and will travel further this is calculated by the plotter and changes the distance cut also will help to get it right if you have stretched the print while laminating, apart from adjusing the cut for skew.

yes i am board stupid trying to match some colours with the printer.

[John Parfit]

That’s the irritant, in Onyx it seems the reg marks are generated within the rip when you click that it’s to be cut after printing, no way it seems of getting to them or adjusting so integral with the print info (you do generate the cut info with a spot colour in your design software, corel in our case).

With the CJv using rasterlink rip and finecut pluggin it’s so much cleaner and logical to me … generate your artwork on one or several layers, generate cut lines on another layer as simple hairlines, whatever colour, draw rectangles around parts or all of the artwork, select rectangle/s and click the reg mark icon in finecut pluggin, that generates reg marks set to how you want them on a ‘reg mark’ layer so artwork layer/s, cut layer, reg mark layer, just export to the hot folder of the rip and it’s all there to print then cut.

Via finecut the plotter doesn’t look for all the reg marks at first, just the origin and then when you tell it which file to cut it knows approx where to find the other marks to begin; with onyx (at moment) I load the print and the mimaki then wants to find all 2,3,or 4 reg marks first without knowing what is to be cut so then it scans until it finds some and then you tell it to cut a certain file via onyx/cut server.. bit strange to me but presently can’t find if I’m doing it wrong/ missing something.

John