Packing for a Vandercook SP-20

Firstly, your bed plate shouldn’t matter to anything, as long as it’s level and brings your type/plates up to type high.

Vandercook recommends no more than .03 over the undercut–so you’d want you paper and tympan/packing thickness to total .43. I find that with Lettra (because it’s so soft), you want a bit more than that–closer to .50.

(I’m not sure what Lettra you’re using that’s 80lb. Is it the text weight?)

Lettra 110# is .021

Tympan is generally a standard .06

I don’t use mylar, so I can’t speak to its thickness, but you should be able to find that info on the packaging and/or the place you purchased it.

With 110# Lettra, I use 1 tympan top sheet (the diecut piece that goes under the gripper bar and around the tightening rod), plus 3-5 tympan packing sheets, depending on the amount of impression I want, and whether the printing is double sided.

Hope that’s helpful!

Kelly

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