Black and Decker Grinder

Revision as of 20:16, 20 March 2007

Figure 1: Fully dissected product

Description

This product is a produced by Black and Decker. The product is used to grind down metal.

How It Works

Inside the grinder there is an electric motor that spins a shaft connected to a bevel gear. The bevel gear is then attached to another driving shaft. A grinding wheel is clamped onto the driving shaft, causing the grinding wheel to spin.

Because of constant friction and the forces acting on each component there is a certain life expency. This varries for individual parts based on the force acting on the part and the design of the part.

For the bearing, an assumed torque of 0.315 Nm was applied to the shaft. Assuming the grinder is being used constantly the bearing would last 1.83 years before failure. If the grinder was being used six hours every day, 365 days a year then the bearing would last 7.33 years. If the grinder was being used six hours a day, five days a week, the bearing would last 10.26 years.

For the force requirement on the gears to rotate the grind wheel at 10,000 RPM, the power consumption of the grinder was looked up. From the power consumption the torque was calculated to be 0.315 Nm, which equates to about 2.61 lbs of force on the workpeice from the grind wheel. This calculates to 12.4626 N of force at the gears to rotate the grind wheel at 10,000 RPM.

To calculate the stress in the gears, a stress equation was used from the Fundamentals of Machine Compoents Design by Robert C. Juvinall. The velocity factor was caluated with the assumption that the gears were precision shaved and ground. The overload factor was calculated with the assumption that the source of power is uniform and the driven machinery is assumed to have moderate shock. Both gears were overhung, which gave a mounting factor of 1.25. The calculated stress in the smaller gear was 613.601 PSI and the stress in the larger gear was 442.438 PSI.

Parts

The table belows lists the Bill of Materials for the disposable camera:

Table 3.1: Disposable Camera Bill of Materials

Part #	Part Name	# Category	Function	Material	Picture
1	Bottom Disk Holder	Support Element	Attaches to bottom disk holder to lock grinding disk in place	Metal
2	Screws	Support Elements	Attach various components to one another	Metal
3	Top disk holder	Support Element	Attaches to disk holder to lock grinding disk in place	Metal
4	Washer	Support Elements	Attacjes grinding shield to the grinder	Metal
5	Handle	Structural Components	Provides grip and stability for the grinder	Plastic with metal screw on end
6	Griding Shield	Structural Components	Protects operator from any parts that may get grinded off from work material	Metal with greese lubricant
7	Transmission	Transmission	Transfers energy from horizontal plane into vertical plane for grinding wheel	Metal with grease lubricant
8	Internal Motor Assembly	Output	Converts the electrical energy into the horizontal mechanical energy	Metal, plastic, and ball bearings
9	Outer Motor Assembly	Input	Creates the electromagnetic field that provides the power for the tool	Metal, wires and plastic
10	Transmission Casing	Structural Components	Attaches the transmission to the motor and allows the shaft and transmission to run smoothly	Metal Composite with grease lubricant

<embed src="http://www.youtube.com/v/yfjMW4G0INM" type="application/x-shockwave-flash" width="425" height="350"></embed>

Right-click here and select "Save Link As" to download the video of the disassembly of the camera (.wmv)

3D Models

3D Models as Alibre Design AD_PRT

Table 5.2: Point and Mesh Clouds Available for Download
(Zipped .wrp format)

Image	Link
Figure 5.1 Front Exterior Scan	Gave to Dave
Figure 5.2 Front Interior Scan	Gave to Dave
Figure 5.3 Rear Exterior Scan (Front View) Figure 5.4 Rear Exterior Scan (Back View)	Gave to Dave
Figure 5.4 Rear Interior Scan	WRP Scan Files

Links

Other Kodak One-Time-Use Cameras