Can someone tell me the tonnage a Heidi Windmill 10 x 15 has? I know it requires so much tonnage per inch of rule to determine if the machine is capable of die cutting a given area. Does anyone know the answer to these questions? I have a round corner BC die, it’s 8 up and the cutting is different from one sheet to another, even with trying to keep the press parallel at the point of impression. The stock is 12pt and laminated on both sides. It appears its too much for the press. It’s a lot of area and tuff stock. thanks

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Try trimming sheet to 4 up and see if it is more consistsant sheet to sheet
Ted Lavin

IIRC, the 10x15 is 40 ton.

Re: calculations, perhaps you have seen this:

the press is capable however if the rules are close together like 0.25” gutters you will get a bed of nails effect that is not about tonnage. Are you doing makeready under the die jacket(best) or under the die?

Are you sure the thickness of the laminate isn’t varying? What happens when you slow the press down…does it cut differently? What do you have for packing under the diecutting jacket? What kind of rubber do you have on your die…soft or hard? Does the cut rule have a centered or side bevel?

Packing is under the die. The press is running pretty slow. The gutters are 1/2 “. The rubber is the same rubber we use on our Heidi cylinder it’s a medium hardness. The cutting rules are center bevel. I believe the lamination is the same it was laminated at our shop and it’s a small run so the am came off the same roll. Thanks for the calc site I will check it out

Heidelberg 10x15 tonnage is 40. See:

Look at the text, towards bottom of right hand column.


After going to the cut smart site and finding a basic formula for figuring tonnage, the press can not handle this area of cutting. 8 units of 11”” of rule is 88” of rule x .010 (the thickness of the substrate) divided by 2000 = 44 tons. It’s already over the press’s limit of 40 tons. This doesn’t include the density of the rubber or the tensile strength of this stock which is 10pt laminated on 2 sides. So even if the area was under the tonnage limit it still would be questionable because of the material being cut. Perhaps 4 up instead of 8 up would work. I ended up doing the job on our Heidi 22x 32 cyl., and even on that press I had to watch the job carefully and patch frequently. Thanks to all all who responded

The 13x18 Heidelberg platen is rated at 60 tons impressional strength as a suitable alternative to the 10x15 Heidelberg. But I wonder why 8-up for a short run? That makes for a higher die cost, increased makeready, and the potential for things getting out of register, etc.


These people are printers, not really finishers, and so they do what works best for them and the finisher is left with the problem of converting to the finished product. It is a constant battle that has always been and will never change as long as there are people making decisions that do not have experience in finishing

few people know how to do a proper makeready for diecutting.