Oh for heavens' sake! Who said the distance even exists in metric units? It's 0.315 by golly INCHES! center-to-center. (For all you metric weenies, that translates to 8mm.)
What do you get if you try to measure the centers? Measure were the oval opening is at it's most forward location.
Not that I'm admitting defeat (or any other kind of feet), but . . . if you use the inside edge / outside edge method I get 8.09mm.
Just try measuring what looks like the center of the sensors from each other.
What's the definition of "center of sensor"? is it the center of the two holes? The center of the sensor lens that's closest to the ground? It depends on what the meaning of is, is.
Never might, you win, If I have to sound like a politician to win an argument (or not admit I lost it), I'd rather loose the argument.
Yes, what to you use to sharpen those blades so the cut so deep into the plastic while measuring the outside distance?
I have a very gentle touch!
Seriously, even with calipers, the measurement is very subjective, and I don't get the same results from both sets of holes. If I had the time and thought it important enough, I would sit the thing on top of a linear array sensor and see where the brightness centroids lay. But even that doesn't get to the meat of the OP's original question. A more significant reading could be obtained by chucking up the S2 in a CNC mill, and moving a black and white target below it in the transverse direction to see where the two sensors change state and taking the difference. My CNC mill is calibrated in inches, though, so I'm not sure that even those results would be acceptable to everyone.
Oh for heavens' sake! Who said the distance even exists in metric units? It's 0.315 by golly INCHES! center-to-center. (For all you metric weenies, that translates to 8mm.)
-Phil
Hey Phil, I'm at Maker Faire this weekend and while browsing around the many interesting demonstrations I noticed that more people are talking in metric. I'm not sure if it's just this crowd or if there's a change in our engineering culture. This wasn't just people referring to thousandths of an inch as a "mil" but people where talking millimeters and centimeters. I ain't kidding, Phil! You might have to change the default measurement preferences in all of your software soon, and recalibrate the Phil Big-Brain supercomputer.
Whether using the metric system or proper units of measure, you all may be correct. The OP stated Scribbler......original or S2? Blue or (as Phil showed us) red??
....and speaking of Peacemakers, I'll see your Peacemaker and raise you a PEACEMAKER!
The Scribbler S1 and S2 housings are made from the same injection mold, which was modified only slightly between models. So the dimension in question here will be "color-invariant."
My yellow S3 is Prop-2 controlled, and comes from the future. In the future, things are much smaller. The robot's interocular distance is 1nm for nanoline following. Honest injun!
Once again, I bow in humbleness and awe to the wisdom of Phil.......and I'll bow to erco also (and back away slowly since amazing pyrotechnics are possible).
Comments
It's always nice to give erco a good beating.
But you didn't specify, is that the center to center distance, or inside edge to inside edge, the gap between sensors?
And if it's actually 7.69 or 7.71 mm, you'll never hear the end of it.
You have approx. 5/16 between sensors. The center can not really be defined as the is about an 1/8" slop side-to-side on the back wheel.
Jim
EDIT: DARN!! Two posts before I finished. Duane must have had one by his side. I had to go up two flights of stairs.
Center to center or outside edge to inside edge or inside edge to outside edge.
To be honest, that's probably +/- 0.04mm.
Would a piece of tape really mind?
Jim
Pretty loosey-goosey for all your normal precisitudinosity, Mr Degn! It's almost as though you were rushing to post before I did!
-Phil
Sorry old man, it doesn't work that way.
If there really is 8mm between those sensors, I'll send you two Propeller chips (I think only cog #0 is bad on them, the other seven should work).
Outside distance is 0.442"; inside, 0.192". (0.442 + 0.192) / 2 = 0.317. Any questions?
-Phil
Yes, what to you use to sharpen those blades so the cut so deep into the plastic while measuring the outside distance?
I'm loving my beating. Thanks, Duane!
What do you get if you try to measure the centers? Measure were the oval opening is at it's most forward location.
Not that I'm admitting defeat (or any other kind of feet), but . . . if you use the inside edge / outside edge method I get 8.09mm.
Just try measuring what looks like the center of the sensors from each other.
What's the definition of "center of sensor"? is it the center of the two holes? The center of the sensor lens that's closest to the ground? It depends on what the meaning of is, is.
Never might, you win, If I have to sound like a politician to win an argument (or not admit I lost it), I'd rather loose the argument.
I think I was right once when Phil and I didn't agree about something. Oh yeah, the PropBOE can get it's power from USB.
That's Duane 1, Phil 23.
Seriously, even with calipers, the measurement is very subjective, and I don't get the same results from both sets of holes. If I had the time and thought it important enough, I would sit the thing on top of a linear array sensor and see where the brightness centroids lay. But even that doesn't get to the meat of the OP's original question. A more significant reading could be obtained by chucking up the S2 in a CNC mill, and moving a black and white target below it in the transverse direction to see where the two sensors change state and taking the difference. My CNC mill is calibrated in inches, though, so I'm not sure that even those results would be acceptable to everyone.
-Phil
Can't we agree to disagree?
Can't we decide not to decide?
Can't we all just get along?
erco the peacemaker
-Phil
P.S. I really hope the OP got the answer he was looking for and didn't get scared away.
Hey Phil, I'm at Maker Faire this weekend and while browsing around the many interesting demonstrations I noticed that more people are talking in metric. I'm not sure if it's just this crowd or if there's a change in our engineering culture. This wasn't just people referring to thousandths of an inch as a "mil" but people where talking millimeters and centimeters. I ain't kidding, Phil! You might have to change the default measurement preferences in all of your software soon, and recalibrate the Phil Big-Brain supercomputer.
....and speaking of Peacemakers, I'll see your Peacemaker and raise you a PEACEMAKER!
-Phil
Hey erco, ole buddy, ole pal - I am you dawg - but how can I go against PhiPi?
It's like choosing between a BASIC Stamp 2 and a Prop - who could choose...