I did the same thing but used a jig saw which my brother in law had used before me on the same thing. The results in both cases was perfect. Not too sure about a hand saw though, unless you can saw very straight and neat.
All kinds of engineering are required. 'Big hammer' engineering is just as important as toolmaker 'you need a thou' off that width' - and you wouldn't pay for the latter to repair your car.
I trimmed a blind. I pressed the ends of the slats together and bound them securely together, no gaps, using masking tape. Then I marked out the cut and chopped off the excess. Make sure there is plenty of tape inboard of the cut so the slats do not fly apart as you cut, but make sure there is tape also over the area to be cut to prevent the top and bottom slats from splintering when sawn.
Finaly, I lacquered the ends using aerosol lacquer to prevent moisture ingress, as I feared the slats might twist if they weren't fully protected from moisture ingress.
Care is needed to get a good finish, and a final sanding of the cut end before lacquering is advisable too o get a decent appearance.
It probably has no application in this instance but I have a (very) vague memory of a convention for unstated limits in which the nature of the units gave some guidance to the tolerances required in which case I would expect dimensioning in eighths would demand a closer tolerance than dimensioning in quarters.
Ha!, When I were a lad, in filing school, they gave me steel bar and some files and told me to make a straight edge. Accurate to within 1 thou ( that's 1 thou everywhere, checked on a table with engineering blue).
The finest cut that I personally have come across is one of those small "pull saws" takes a bit of getting used to, but boy does it cut fine... Rick... (The other Rick)
That's a project? I had to file a gauge to 3thou and then make a "c" clamp from a square or metal 1/2" thick including turning and threading the screw for my O level. I didn't realise engineering was being dumbed down like the rest of the GCSEs these days. ;-)
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