Hey everyone! I recently bought a stop rule from Lee Valley (link here: https://www.leevalley.com/en-us/shop/tools/hand-tools/marking-and-measuring/rules/61607-stop-rules), and I noticed that the scale doesn't reach all the way to the end of the ruler. Is there a common reason for this design choice? I usually find it easier to start my measurements right from the end of the ruler, and I'm thinking about returning it because of this. Any insights?
3 Answers
The reason for that is mainly for accuracy! The design is made to reduce parallax errors when you read the measurements. You’re actually meant to focus on where the etched lines on the stop align with the rule itself, which helps to eliminate any visual confusion.
Are you trying to use it like a typical ruler? That's not its main purpose! The scale matches up with the vernier scale’s zero point and helps with measuring offsets and making precise marks. I find it handy for tasks like aligning boards and transferring measurements without starting from scratch. I thought it was a great substitute for a caliper in many situations!
I’ve never even heard of a vernier scale before! Maybe I should give it a shot, but it’s confusing when the advertisements show it being used in ways that don’t seem logical.
Most accurate rulers are designed this way to avoid damage at the end which can throw off measurements. A tape measure might be a better choice if you need to press against something to measure accurately. Plus, those ends are made to withstand more wear and tear, making your measurements more reliable in the long run.
That makes sense! But I was just looking at this photo on the Veritas site where the guy draws a line with the edge of the ruler, and it doesn't add up to me.
I see what you mean! It makes sense that it helps with accuracy, but it’s just a bit odd for me.