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I just think folks are over thinking how accurate their stuff for wood working needs to be. Plenty of companies making money off them selling them "CNC square....." when the results will be no different than something far cheaper. At some point if people are needing extreme accuracy, it's time to buy a 4x8 CNC router, and even then they will only be so accurate.
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I have a close friend. A good fella and a maverick in mechatronics prototyping.
When he saw me calibrating the $700 Festool saw for the $100 Festool rail and testing the squareness of a cut from a $150 rail square he was truly puzzled.
Background:
In our shared workshop there already was a $50 Makita saw and aplenty of "reasonably-straight" guiding pieces for cutting with it.
/below is a paraphrase of a real conversation/
He:
I do not understand why you are wasting your time and money with this. Wood stuff is cut close-enough and whatever material is over or under the need is filed, filled or just forced. Wood bends and shrinks, so what is the point ?
Me:
How much time do you usually spend fitting things (he does mostly stuff like barn doors, no way close to home furniture stuff) after you cut your pieces ?
He:
A couple hours. Is messy work.
Me:
Well, I like to avoid the messy part completely. That is what this accuracy is for. Cut once. And by the way, it means I can actually make good-looking furniture, not just "barn doors".. and do so at a reasonable time cost.
He:
Ehm.
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Designing such that it is
possible to address measuring errors is absolutely desirable and should be done whenever one can do. In some cases that is the only way.
The same way when making a solitary piece, cutting and drilling via transferred measures is the way to go.
But. It is even better to NOT HAVE TO include the "fix our sloppy cuts" work task at all when you are about to make 10 library cabinets.
Some people get a $10k table saw and rent shop space for it. Some get $2k tracksaw and accessories set instead. For each his own..
/if someone is an artisan making solitary unique hardwood pieces, then it is a completely different talk/