I&#;ve never cut memory foam - but we produced assemblies for aircraft customers that included various foam inserts (almost like upholstery cushions). We had a Bosch A with several different lengths of knife blades for different thicknesses. It sort of works like an electric knife that uses 2 counter moving scalloped-edged blades to do the cutting. I was then a pricey tool and I&#;m not sure that it is still made. I see on Amazon that there are alternatives:
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https://www.amazon.com/s?k=bosch+foam+rubber+cutter&gclid=EAIaIQobChMIlv7Gm-Pe_QIVi_7jBx3_xgQeEAAYAiAAEgJ85vD_BwE&hvadid=&hvdev=c&hvlocphy=&hvnetw=g&hvqmt=e&hvrand=&hvtargid=kwd-&hydadcr=_&tag=googhydr-20&ref=pd_sl_4l2xvt1bk1_e
The Hercules one looks much like the old Bosch - and was probably sourced from Harbor Freight - but is no longer available on their site.
The current Bosch model doesn&#;t seem to be readily available this side of the pond - but can be ordered (very expensive for a 1 off project)
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You might also experiment with a much less expensive electric knife:
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amazon.comOnline shopping for Kitchen Knives & Accessories from a great selection of Cutlery Sets, Specialty Knives, Sharpeners, Cutting Boards, & more at everyday low prices.
$25.99
I know this sounds funny but I'm hoping some of you upholsterers will chime in.
I bought outdoor foam (expensive!) that is 4" thick. My seat cushion that I'm making curves and flares. I need to cut my foam perfectly so that it holds it's shape on the sides for my fabric to lay over nicely. I mean, I'm afraid that if it has hacked edges or if I compress the foam to cut it, maybe the sides will bulge therefore making me cut too much out of the sides. Does that make sense? I just want the "planes" of the cushion to be at 90 degree angles of each other.
I feel like taking a huge steak knife or saw blade and chiseling out the shape---but what is the proper way to do it?
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