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Wheeled Box

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Project by oldnovice posted 04-20-2009 07:30 AM 4394 views 3 times favorited 19 comments Add to Favorites Watch

Anyone know what this is or what is it’s function?

The base is aircraft plywood, the rails are cherry, the wheel is walnut (with a neoprene O-ring tire and ball bearing) the slide is Plexiglas, the accents are brass, and a modified Pentel .5mm pencil.
The over all length is 6.28 inches!

-- "I never met a board I didn't like!"





19 comments so far

View jack1's profile

jack1

1953 posts in 2776 days


#1 posted 04-20-2009 07:44 AM

what are the dimensions including the wheel? What does the bottom look like? Was there any residue inside the tray such as paper dust or…?

-- jack -- ...measure once, curse twice!

View DaleM's profile

DaleM

924 posts in 2132 days


#2 posted 04-20-2009 07:49 AM

I don’t know what it is supposed to be but it looks like if you run the wheel along a straight edge, the pencil will draw an arc and if you continue to move it further it will draw a wavy line. The size of the arc can be adjusted smaller by putting the pin in the other threaded hole closer to the center of the wheel. What is the prize for getting it right?

-- Dale Manning, Carthage, NY

View interpim's profile

interpim

1133 posts in 2207 days


#3 posted 04-20-2009 07:52 AM

Is this a Spirograph of some sort?

-- San Diego, CA

View oldnovice's profile

oldnovice

3868 posts in 2116 days


#4 posted 04-20-2009 08:03 AM

Not bad guesses at all! You guys are good!

Drawing the wheel along a straight edge with the pencil on a piece of paper results in a nearly perfect sine wave. Moving the pin to the other hole in the wheel decreases the amplitude but not the frequency.

The history of this is that about then years ago one of my colleagues at work want something to show how a sine wave is created for a science class he was teaching after work. I made a crude prototype that he kept. Then another colleague asked for one for a math teacher in the Boston area so a made two; one for him and one for me.

I do have the plans for a version that changes frequency and amplitude but no one has asked for one of these.

-- "I never met a board I didn't like!"

View oldnovice's profile

oldnovice

3868 posts in 2116 days


#5 posted 04-20-2009 08:14 AM

I really hope that I don’t annoy anyone with these types of projects!

-- "I never met a board I didn't like!"

View DaleM's profile

DaleM

924 posts in 2132 days


#6 posted 04-20-2009 08:16 AM

It should be easy for most of the people on here to figure out how something works. I figure a lot of the people that build things now, which is just about everyone on LJs, are the same ones who took everything apart as kids to see how it worked. I guess we have to build a few things now to make up for all the things that we couldn’t quite put back together right way back then. By my way of thinking, I have a few kids who should be building a lot of things when they grow up.

-- Dale Manning, Carthage, NY

View jack1's profile

jack1

1953 posts in 2776 days


#7 posted 04-20-2009 08:23 AM

Good thing I didn’t guess coffee grinder… ;o)

-- jack -- ...measure once, curse twice!

View Gary Fixler's profile

Gary Fixler

1000 posts in 2130 days


#8 posted 04-20-2009 09:35 AM

Aww, I figured out all of it, but didn’t realize there were a bunch of comments already wherein you explained it. I even figured out the other screwhole for moving the knob for a smaller amplitude sine wave :)

Neat device! Thanks for sharing.

Edit: I still haven’t solved the two parallel keyhole slots, though. What are those for?

-- Gary, Los Angeles, video game animator

View ghazard's profile

ghazard

380 posts in 2258 days


#9 posted 04-20-2009 03:02 PM

Regarding the 2 keyhole slots…my guess is to create a little bit of flex in the “mounting” of the pencil to allow it to follow a surface that is not 100% flat…a little suspension system to keep the rigid tip of the pencil from breaking. ???

I’m curious?

A neat tool. Thanks for sharing.

-- "Hey, you dang woodchucks! Quit chuckin' my wood!"

View a1Jim's profile

a1Jim

112898 posts in 2326 days


#10 posted 04-20-2009 04:32 PM

I was going to guess a replica of an antique CD player

-- http://artisticwoodstudio.com Custom furniture

View patron's profile

patron

13171 posts in 2090 days


#11 posted 04-20-2009 04:37 PM

i don’t get it , if you spin the wheel all it does is move the pencil back and forth in a straight line .
wher does the curve come in ?
maybe you could show it in action ?
maybe im an idiot , but i like to think a smart one !

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View patron's profile

patron

13171 posts in 2090 days


#12 posted 04-20-2009 04:46 PM

ok i got it now , run the exposed rubber of wheel on srait edje and pencil moves up and down , as it moves across !

nice tooling !

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View TopamaxSurvivor's profile

TopamaxSurvivor

15080 posts in 2424 days


#13 posted 04-20-2009 11:35 PM

Neat little gadget. What are the slots on each side of the pencil for?

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View oldnovice's profile

oldnovice

3868 posts in 2116 days


#14 posted 04-21-2009 01:30 AM

ghazard was 100% correct.

The slots form a flex arm for the pencil while the large diameters at the end of the slots relieve the stress and stop any potential crazing of the Plexiglas.

-- "I never met a board I didn't like!"

View TopamaxSurvivor's profile

TopamaxSurvivor

15080 posts in 2424 days


#15 posted 04-21-2009 03:11 AM

I thought it might be stress relief, but wasn’t sure a piece that small would have stress enough to worry about. Thx.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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