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I've been wanting to ask how you guys are measuring wb on a deck.
I've seen lotsa ppl make mistakes trying to measure center-to-center..
Does anyone actually try to eyeball the center of the hole?
And for axle-to-axle wb..
Eyeballing the center of the axle?
Use the sides, not the centers, it's the same distance.
Same side to same side..
Deck wheelbase, most woodshops are using jigged drilling rigs. I've yet to get a deck from BBS or PS that didn't match the stated wheelbase. But for the sake of methodology, yes I'd just go from center of the hole to center of the hole. We're using imperial measurement so even if you're off slightly from the center of the holes it's not going to yield even a 1/16" of difference from say, 14.25." You'd be talking 1mm or less. And when it comes to decks, tolerances are far less tight period due to expansion/shrinkage, etc.
As for axle to axle wheelbase, yes, center, eyeballed. It's not perfect, but it's not aircraft tolerances we're dealing with either, that's why it's measured to the 1/16" not the 64th or metric. Trucks are going to move, tilt and be off center, so if you wanted to go further you can measure both sides and average the two numbers. But then you're going to step on it and it's going to shift again. So I'd say, a measurement to the closest 1/16" is probably as precise as you're going to get with the crude mechanics of a skateboard.
Try this trick..
I use a soft (tailor/sewing) tape measure that will easily lay flat. I also line up at 1" or 2", never use the end of a soft tape.
Put your board on your lap or a table and orient is so it's nose/tail left/right, or right/left, doesn't matter which.
There's 4 bolt holes in the center that you could use to measure wb..
Each of these holes has a side/edge closer to the nose and a side closer to the tail. Nose side and tail side..
Pick a side, nose or tail..
I'm picking nose side
Measure from the nose side of 1 hole to the nose side of the other hole. This will give you center to center distance.
It's kinda the same as adding 1/2 bolt hole radius to one side and subtracting it from the other..
Also works on an assembled board if you use the heads on your hardware.
Axle wb..
Hook the end of your (hard) tape measure over the side of an axle so you can look down on the tape with griptape facing down.
We're still doing the nose side, tail side thing here
Now you just have to eyeball the axle wb by looking down at the side of the other axle. The same side as your tape is hooked on..
Sorry if I'm over-explaining..