Reciprocating Saw - Revision history

Dgeiman at 22:06, 22 March 2007

2007-03-22T22:06:55Z

Dgeiman at 19:36, 22 March 2007

2007-03-22T19:36:36Z

Dgeiman at 17:34, 22 March 2007

2007-03-22T17:34:17Z

Dgeiman at 17:13, 22 March 2007

2007-03-22T17:13:24Z

Dgeiman at 15:27, 22 March 2007

2007-03-22T15:27:12Z

Dgeiman at 15:22, 22 March 2007

2007-03-22T15:22:46Z

Dgeiman at 15:22, 22 March 2007

2007-03-22T15:22:28Z

Dgeiman at 15:21, 22 March 2007

2007-03-22T15:21:09Z

Dgeiman at 15:15, 22 March 2007

2007-03-22T15:15:07Z

Dgeiman at 15:12, 22 March 2007

2007-03-22T15:12:01Z

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 The reciprocating saw runs off a 120 Volt, 8.5 Amp motor.  At the end of the motor is a spiral bevel gear that is attached to a scotch yoke mechanism.  The scotch yoke mechanism converts circular motion to linear motion.  Referring to the avi file below, the mechanism involves a circular gear with a pin connected to a shaft.  The linear motion is what moves the saw back and forth in its reciprocating motion.
-The radial ball bearings on the motor were analysed as medium bearings with a phi of 20 degrees and alpha of zero.  At first the power from the motor was calculated in ansys however the power seemed to be too small so it was decided to assume that the power was the voltage multiplied by the current to give us 540 Watts.  From this the force on the tip could be calculated and was found to be 99.6 N.  Through force and moment calculations the normal forces were calculated and plugged into the lifetime equation for medium bearings.  The results were that the bearing closest to the tip would fail first at 121446 hours.  The major assumption that forces this number to be so large is that the shock was not taken into account.  If this were calculated the time would be even more realistic.
+The radial ball bearings on the motor were analyzed as medium bearings with a phi of 20 degrees and alpha of zero.  At first the power from the motor was calculated in ansys however the power seemed to be too small so it was decided to assume that the power was the voltage multiplied by the current to give us 540 Watts.  From this the force on the tip could be calculated and was found to be 99.6 N.  Through force and moment calculations the normal forces were calculated and plugged into the lifetime equation for medium bearings.  The results were that the bearing closest to the tip would fail first at 121446 hours.  The major assumption that forces this number to be so large is that the shock was not taken into account.  If this were calculated the time would be even more realistic.
 Analysis in Adams yields a power output of about ¼ horsepower when cutting a medium sized log.  As far as the power output is concerned there is not much as far as improvements.  If a larger stoke was implemented, the time required to cut would be reduced significantly.  However, a larger stoke implies a larger device which will increase material costs.

← Older revision		Revision as of 19:36, 22 March 2007
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	The reciprocating saw runs off a 120 Volt, 8.5 Amp motor. At the end of the motor is a spiral bevel gear that is attached to a scotch yoke mechanism. The scotch yoke mechanism converts circular motion to linear motion. Referring to the avi file below, the mechanism involves a circular gear with a pin connected to a shaft. The linear motion is what moves the saw back and forth in its reciprocating motion.		The reciprocating saw runs off a 120 Volt, 8.5 Amp motor. At the end of the motor is a spiral bevel gear that is attached to a scotch yoke mechanism. The scotch yoke mechanism converts circular motion to linear motion. Referring to the avi file below, the mechanism involves a circular gear with a pin connected to a shaft. The linear motion is what moves the saw back and forth in its reciprocating motion.
		+
		+	The radial ball bearings on the motor were analysed as medium bearings with a phi of 20 degrees and alpha of zero. At first the power from the motor was calculated in ansys however the power seemed to be too small so it was decided to assume that the power was the voltage multiplied by the current to give us 540 Watts. From this the force on the tip could be calculated and was found to be 99.6 N. Through force and moment calculations the normal forces were calculated and plugged into the lifetime equation for medium bearings. The results were that the bearing closest to the tip would fail first at 121446 hours. The major assumption that forces this number to be so large is that the shock was not taken into account. If this were calculated the time would be even more realistic.

	Analysis in Adams yields a power output of about ¼ horsepower when cutting a medium sized log. As far as the power output is concerned there is not much as far as improvements. If a larger stoke was implemented, the time required to cut would be reduced significantly. However, a larger stoke implies a larger device which will increase material costs.		Analysis in Adams yields a power output of about ¼ horsepower when cutting a medium sized log. As far as the power output is concerned there is not much as far as improvements. If a larger stoke was implemented, the time required to cut would be reduced significantly. However, a larger stoke implies a larger device which will increase material costs.

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 The reciprocating saw runs off a 120 Volt, 8.5 Amp motor.  At the end of the motor is a spiral bevel gear that is attached to a scotch yoke mechanism.  The scotch yoke mechanism converts circular motion to linear motion.  Referring to the avi file below, the mechanism involves a circular gear with a pin connected to a shaft.  The linear motion is what moves the saw back and forth in its reciprocating motion.
-Analysis in ANSYS yields a power output of about ¼ horsepower when cutting a medium sized log.  As far as the power output is concerned there is not much as far as improvements.  If a larger stoke was implemented, the time required to cut would be reduced significantly.  However, a larger stoke implies a larger device which will increase material costs.
+Analysis in Adams yields a power output of about ¼ horsepower when cutting a medium sized log.  As far as the power output is concerned there is not much as far as improvements.  If a larger stoke was implemented, the time required to cut would be reduced significantly.  However, a larger stoke implies a larger device which will increase material costs.
-−

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 == 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.
+The reciprocating saw runs off a 120 Volt, 8.5 Amp motor.  At the end of the motor is a spiral bevel gear that is attached to a scotch yoke mechanism.  The scotch yoke mechanism converts circular motion to linear motion.  Referring to the avi file below, the mechanism involves a circular gear with a pin connected to a shaft.  The linear motion is what moves the saw back and forth in its reciprocating motion.
-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.
+Analysis in ANSYS yields a power output of about ¼ horsepower when cutting a medium sized log.  As far as the power output is concerned there is not much as far as improvements.  If a larger stoke was implemented, the time required to cut would be reduced significantly.  However, a larger stoke implies a larger device which will increase material costs.
 ==Parts==

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 ==Description==
-This product is a produced by Black and Decker.  The product is used to grind down metal.
+The Skil Reciprocating Saw has removeable blades to cut materials ranging from wood to metal.
 == How It Works ==

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 | [[Image:blade1.JPG  |center|thumb|50px]]
 |}
 ==View Saw in Motion==
 [[Media:saw.avi]]

← Older revision		Revision as of 15:21, 22 March 2007
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−
	[[Image:saw4.jpg\|right\|thumb\|300px\|Figure 1: Skil Reciprocating Saw]]		[[Image:saw4.jpg\|right\|thumb\|300px\|Figure 1: Skil Reciprocating Saw]]

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−	~~<embed src="http~~:~~//www~~.~~youtube.com/v/yfjMW4G0INM" type="application/x-shockwave-flash" width="425" height="350"></embed>~~	+	[[Media:saw.avi]]

← Older revision		Revision as of 15:15, 22 March 2007
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−	~~{{disassembly}}~~
−	~~{{drawings}}~~
−	~~{{CAD_Models}}~~
−	~~{{Scanned}}~~

	[[Image:saw4.jpg\|right\|thumb\|300px\|Figure 1: Skil Reciprocating Saw]]		[[Image:saw4.jpg\|right\|thumb\|300px\|Figure 1: Skil Reciprocating Saw]]

← Older revision		Revision as of 15:12, 22 March 2007
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	<embed src="http://www.youtube.com/v/yfjMW4G0INM" type="application/x-shockwave-flash" width="425" height="350"></embed>		<embed src="http://www.youtube.com/v/yfjMW4G0INM" type="application/x-shockwave-flash" width="425" height="350"></embed>
−
−	~~[[media:Camera_Dissection.wmv\|Right-click here and select "Save Link As" to download the video of the disassembly of the camera (.wmv)]]~~