tolerances and accuracy

[Carl Prentiss]

I frequently use the saw plate trick but would never have thought to use paper(or Tom's ninja stealth technique)
Good discussion, this.

 

[VW mick]

What's a 1/64th

 

[grbmds]

1/64 inch equals approximately .4 mm (if I'm doing my conversions correctly).

 

[semenza]

Thanks Seth, and what you use to verify 1/64"
What marking tools you use to achieve 1/64"

  Well I presume that my marking tools are accurate to a verified reference. But more importantly I make sure they are accurate to each other. So that all of my rules and squares match up and give the same reading. That way I can switch measuring tools without introducing error from the tools. Same for any scales that are on equipment.  Mostly using Woodpeckers tools.

  And as others have pointed out using methods to ensure that all like pieces are cut exactly the same.

Seth

 

[sancho57]

What Rick said

I figure its OK to be off short long whatever as long as its consistent.

 

[RC]

I'm happy to just go a click or two at a time on my Incra LS positioner and inch in 0.1mm at a time if needed.

Usually end up jumping to 0.2 or 0.3mm at a time to get where I need to be a bit quicker.

Half the time I think the engineer in me makes me build too precise pieces as drawers are snug between their runners and panels slide in their dadoes only exactly at 90-degrees and any deflection results in racking.

Last drawers I build I had to purposefully introduce 0.3mm of 'error' to fit the drawer bottoms in at all during assembly ;-)