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Anyone got any tips on cutting seat foam ?

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AshimotoK0:
Anyone got any tips on cutting seat foam?  I need to make a new foam for my '61 CB92 project. I do have the remains of the old one ..it's very much in the style of the CB750 sandcast ...i.e. made out of many blocks of red rubber sponge. I seem to remember somebody using an electric carving knife to contour the surfaces of seat foam  but any practical advice gladly received. I am going to make the new one out of a single piece if I can ... hopefully cut from the foam of my old CB500K0 foam or possibly a  nice CB250K0 foam. The 1961 CB92 seat was a tiny and  flimsy affair but an absolute hens teeth item to find in decent nick. I have just learned to TIG weld (well sort of  :-[ :-[) and repaired the steel base so that it looks fairly acceptable, which is a real bonus.

UK Pete:
I have used an electric knife with reasonable success,  and a fine toothed wood saw as well, I have heard the hot wire method can be used but never tried it, I don't think any of these methods are ideal, and also Wait to here How other people gave done it

Sent from my SM-G950F using Tapatalk

JamesH:
Pro upholsterer near me uses an electric bread knife and hot wire method..

K2-K6:
As both above,  work quite well dependant on foam type.

Add one of those wavy bread knives to the pile,  freshly sharpened on a "steel" prior to use.  The scalloped type that is,  as it stops the blade pulling the foam into distortion as it cuts.

One of the best and most effective I've seen was a band saw we had set up with a blade that had the teeth ground off the blade to make it a straight knife effect,  really did cut like butter.

Did anyone see that current series program "Goblin works garage"?  Guy on there "comped" a seat foam shape buy glueing slabs of yoga mat together with contact adhesive,  very cheap effective way of prototyping if not finalised form.  Worth looking at for idea.

Nurse Julie:
I used electric carving knife and bread knife when I made the seats for our 550 and 750 Mongrels. I used that heavy duty reconstituted foam and it cut well.

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