December 2011

You are currently browsing the monthly archive for December 2011.

It’s not easy to find concrete examples of shipping costs for McMaster-Carr online, and they don’t tell you what an order is going to cost to ship until after it’s already shipped — and that can be a little scary especially if you’re ordering odd sized parts, even if they only charge their shipping cost. So here’s a real example of shipping costs for a small order with some long parts to NC, USA. The order was placed online and shipped the same day from their Atlanta, GA, USA location. It was ordered on December 29, and received in North Carolina on January 3.

For a reprap build, I ordered these items, which include three 3-foot steel rods, 200 nuts, 292 washers, and 200 machine screws. Shipping was only $6.52 for everything. That’s not bad at all…

Description Ordered Unit Price Total
95462A030 Zinc-Plated Grade 5 Steel Hex Nut, 5/16″-18 Thread Size, 1/2″ Width, 17/64″ Height, Packs of 100 1

Pack
4.56

Per Pack
4.56
90126A509 Zinc-Plated Steel Type A SAE Flat Washer, No. 6 Screw Size, 3/8″ OD, .03″-.07″ Thick, Packs of 100 1

Pack
1.27

Per Pack
1.27
90272A153 Zinc-Plated Steel Pan Head Phillips Machine Screw, 6-32 Thread, 1″ Length, Packs of 100 1

Pack
3.16

Per Pack
3.16
90631A007 Zinc-Plated Grade 2 Steel Nylon-Insert Hex Locknut, 6-32 Thread Size, 5/16″ Width, 11/64″ Height, Packs of 100 1

Pack
2.48

Per Pack
2.48
92005A120 Metric Pan Head Phillips Machine Screw, Zinc-Plated Steel, M3 Size, 10MM Length, .5MM Pitch, Packs of 100 1

Pack
2.30

Per Pack
2.30
8890K41 W1 Tool Steel Rod, .3125″ Diameter, Trade Size 5/16″, 3′ Length 3

Each
4.24

Each
12.72
90126A030 Zinc-Plated Steel Type A SAE Flat Washer, 5/16″ Screw Size, 11/16″ OD, .05″-.08″ Thick, Packs of 192 1

Pack
4.50

Per Pack
4.50
Merchandise 30.99
Shipping 6.52
Total $37.51
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Well, I discovered that Popsicle is a brand name, so I’m officially renaming this little guy “StickBot” so the Popsicle police don’t come after me. To be clear, this little bot has nothing to do with Popsicle brand ice pops, and never did. My appologies Popsicle; I hope you still let me eat your ice pops because life just would not be the same without them.

Now that I’ve come clean, here’s a video that show how to assemble StickBot’s right eye. It’s an analog 555 timer-based 1Hz oscillator that controls the right/left PWM servo signals generated by the left eye.

This is the latest version, powered directly by four 1.5V LR61 batteries (similar to AAAA batteries, and often found inside 9V batteries). As a result, it does away with the voltage regulator.

Details for the previous version can be found here: StickBot V2.0 - Untethered!. The original tethered version can be found here: StickBot: A Simple 6-Legged Walker. I’ll try to get updated schematics and more assembly videos up soon.

I’ve had a few people ask me if I have a kit for this little critter. I’m working on one geared toward kids — it’s a fun project to do with kids, and it seems like they really learn a lot from it.

The parts for this eye include:

  • 555 Timer IC
  • 1k ohm resistor
  • 330k ohm resistor
  • 2.2uF capacitor
  • About 9 inches of Cat 5 network cable, phone cord, or other similar wire
  • Some electrical tape, solder, and soldering iron
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