Group 36 - Ryobi Contractor's Saw - Revision history

MAE277G36 at 00:08, 11 December 2007

2007-12-11T00:08:02Z

MAE277G36 at 00:04, 11 December 2007

2007-12-11T00:04:49Z

MAE277G36 at 00:00, 11 December 2007

2007-12-11T00:00:57Z

MAE277G36 at 23:39, 10 December 2007

2007-12-10T23:39:10Z

MAE277G36: /* How the Saw Works */

2007-12-10T23:25:05Z

How the Saw Works

MAE277G36 at 16:44, 8 December 2007

2007-12-08T16:44:55Z

MAE277G36: /* Disassembly Procedure */

2007-12-08T16:30:19Z

Disassembly Procedure

MAE277G36 at 16:29, 8 December 2007

2007-12-08T16:29:06Z

MAE277G36: /* Disassembly Procedure */

2007-12-08T16:17:03Z

Disassembly Procedure

MAE277G36 at 16:12, 8 December 2007

2007-12-08T16:12:04Z

@@ Line 2: / Line 2: @@
 For this project, our group was instructed to examine the Skilsaw contractor's saw. We first disassembled the saw, and analyzed its components. We then made recommendations for design improvements, before reassembling it.
 ==Introduction==
@@ Line 47: / Line 46: @@
 . Removed C-clip and depth adjustment lever with pliers and a 12mm wrench.
-. Removed lower guard with hands.
+[[8]]. Removed lower guard with hands.
-[[step 8|step--8.jpg]]
+[[9]]. Removed 3 short screws with T-20 screw driver and bearing flange.
-. Removed 3 short screws with T-20 screw driver and bearing flange.
+[[10]].Removed pinion shaft.
-−
-[[step 9|step--9.jpg]]
-−
-.Removed pinion shaft.
-−
-[[step 10|step--10.jpg]]
 .Removed 4 long screws from upper guard with a T-20 torx bit.
-.Removed upper guard with hands.
+[[12]].Removed upper guard with hands.
-[[step 12|step--12.jpg]]
+[[13]].Removed rotor with hands.
-−
-.Removed rotor with hands.
-[[step 13|step--13.jpg]]
 .Removed plain washer and washer from the rotor.
@@ Line 72: / Line 62: @@
 .Removed 6 medium screws to take handle apart with T-20 torx bit.
-.Pulled the handle off with hands.
+[[16]].Pulled the handle off with hands.
-−
-[[step 16|step--16.jpg]]
 [[17]].Removed 2 medium screws and pulled off housing cover with hands.
@@ Line 82: / Line 70: @@
 .Took apart brushes with hands.
-.Removed 2 long screws from stator.
+[[20]].Removed 2 long screws from stator.

@@ Line 49: / Line 49: @@
 . Removed lower guard with hands.
-[[step--8.jpg]]
+[[step 8|step--8.jpg]]
 . Removed 3 short screws with T-20 screw driver and bearing flange.
-[[step--9.jpg]]
+[[step 9|step--9.jpg]]
 .Removed pinion shaft.
-[[step--10.jpg]]
+[[step 10|step--10.jpg]]
 .Removed 4 long screws from upper guard with a T-20 torx bit.
@@ Line 63: / Line 63: @@
 .Removed upper guard with hands.
-[[step--12.jpg]]
+[[step 12|step--12.jpg]]
 .Removed rotor with hands.
-[[step--13.jpg]]
+[[step 13|step--13.jpg]]
 .Removed plain washer and washer from the rotor.
@@ Line 74: / Line 74: @@
 .Pulled the handle off with hands.
-[[step--16.jpg]]
+[[step 16|step--16.jpg]]
-.Removed 2 medium screws and pulled off housing cover with hands.
+[[17]].Removed 2 medium screws and pulled off housing cover with hands.
-−
-[[step--17.jpg]]
 .Slid out motor brushes with needle nose pliers.
@@ Line 86: / Line 84: @@
 .Removed 2 long screws from stator.
-[[step--20.jpg]]
+[[step 20|step--20.jpg]]

@@ Line 48: / Line 48: @@
 . Removed lower guard with hands.
 . Removed 3 short screws with T-20 screw driver and bearing flange.
 .Removed pinion shaft.
 .Removed 4 long screws from upper guard with a T-20 torx bit.
 .Removed upper guard with hands.
 .Removed rotor with hands.
 .Removed plain washer and washer from the rotor.
@@ Line 65: / Line 74: @@
 .Pulled the handle off with hands.
-.Removed 2 medium screws and pulled off  housing cover with hands.
+[[step--16.jpg]]
 .Slid out motor brushes with needle nose pliers.
@@ Line 72: / Line 85: @@
 .Removed 2 long screws from stator.
 The disassembly was relatively easy except for pulling off the C-Clip, which needed to be slowly worked out of its former position, so as not to damage it.

@@ Line 401: / Line 401: @@
 We also noticed that there were no ball bearings on the bushings. Instead, the bushings were heavily lubricated with grease. If the lubricant was burned away by regular use, there could be a large amount of friction created, efficiently "burning out" the motor. We suggest that to increase the longevity of the saw, ball bearings are added to the bushings.
 ==References==
-Product Detail - 7 1/4" Skilsaw - Model #5400-01. (n.d.). Retrieved December 3, 2007, from http://www.skiltools.com/en/AllTools/Category/Product/default.htm?pid=5400-01&cid=192160
+Brain, Marshall, "Howstuffworks 'How Electric Motors Work'". (n.d.). Retrieved December 8th, 2007, from http://electronics.howstuffworks.com/motor.htm .

@@ Line 387: / Line 387: @@
 ===How the Saw Works===
-Depressing the safety switch allows for the trigger to be pulled,
+Depressing the safety switch allows for the trigger to be pulled, which completes the electrical circuit of the saw. The electricity runs through wires to the stator, and the AC current causes its electromagnet to become charged, and to flip its poles very quickly. At the same time, the rotor becomes charged as well, but its poles remain constant. The rapid flipping of the poles of the stator causes the rotor to turn, and the carbon brushes allow for electricity to reach the rotor, even while it is spinning. The spinning rotor causes the gears to turn, which then spins the blade.
 ===Reassembly===

← Older revision		Revision as of 16:44, 8 December 2007
Line 384:		Line 384:

	==After Assembly==		==After Assembly==
		+
		+	===How the Saw Works===
		+
		+	Depressing the safety switch allows for the trigger to be pulled,

	===Reassembly===		===Reassembly===

@@ Line 343: / Line 343: @@
 ==Assembly==
-. Placed rotor and motor back in housing cover.
+. Placed stator and two long screws into housing, using a T-20 torx bit.
-. screw in the two screw back in stator.
+. Reassembled carbon brushes with hands, and placed into housing with hands.
-. placed screw back in housing.
+. Replaced vent cover and two medium screws, using a T-20 torx bit.
-. placed handle back together with wires back inside.
+. Slid handle parts back onto housing, and realigned the switch and wires inside of it with hands.
-. Placed screws back in with T-20 torx screw driver.
+. Replaced 6 medium screws in handle with T-20 torx bit.
-. Placed plain washer and 2 washers to the armature.
+. Replaced plain washer and washer on rotor with hands.
-. Placed armature back on.
+. Placed rotor into housing with hands.
-. Placed upper guard back on by hands.
+. Reattached upper guard to housing with 4 long screws and a T-20 torx bit.
-. Placed 4 screws back on upper guard with a T-20 torx screw driver.
+. Replaced pinion shaft with hands.
-. Place pinion shaft back on.
+. Replaced bearing flange with hands, and secured with 3 short screws and the T-20 torx bit.
-. Placed 3 short screw with T-20 screw driver back on.
+. Eased lower guard back into place with hands.
-. Place lower guard back on.
+. Replaced depth adjustment lever and c-clip with needle nose pliers.
-. Placed C-clip and depth adjustment lever with pliers and a 12mm wrench back on.
+. Replaced spring ring with hands.
-. Place spring back on by hand
+. Replaced center bolt and washers with hands.
-. Placed blade-holding bolt and washers with 13mm socket back on.
+. Replaced spring with pliers.
-. Placed spring from lower guard with tweezer (difficult)
+. Replaced lower guard lift with T-20 torx bit.
-. Placed lower guard lift with T-20 torx bit
+. Replaced rubber stopper and large screw with a T-30 torx bit.
 ==After Assembly==

@@ Line 35: / Line 35: @@
 . Took out Wrench with hands
-. Remove rubber stopper with T-30 torx bit
+. Removed rubber stopper with T-30 torx bit
-. Remove lower guard lift with T-20 torx bit
+. Removed lower guard lift with T-20 torx bit
-. Remove spring from lower guard with needle nose pliers
+. Removed spring from lower guard with needle nose pliers
 . Removed blade-holding bolt and “washers” with 13mm socket
@@ Line 53: / Line 53: @@
 .Removed pinion shaft
-.Removed 4 long screws from upper gaurd with a T-20 torx screwdriver
+.Removed 4 long screws from upper guard with a T-20 torx bit
 .Removed upper guard with hands
@@ Line 59: / Line 59: @@
 .Removed armature with hands
-.Removed plain washer and 2 washers from the armature
+.Removed plain washer and washer from the armature
-.Removed 6 screws to take handle apart with T-20 torx screwdriver
+.Removed 6 medium screws to take handle apart with T-20 torx bit
 .Pulled the handle off with hands
@@ Line 73: / Line 73: @@
 .Removed 2 long screws from stator
-The disassembly was relatively easy except for pulling off the C-Clip, which needed to be slowly worked out of its former position.
+The disassembly was relatively easy except for pulling off the C-Clip, which needed to be slowly worked out of its former position, so as not to damage it.
 ==After Disassembly==

← Older revision		Revision as of 16:12, 8 December 2007
Line 328:		Line 328:


−	We also produced a video clip, using the CAD drawings. It can be viewed [~~[Media:~~ http://youtube.com/watch?v=YiYenGM_ttI\|here]].	+	We also produced a video clip, using the CAD drawings. It can be viewed [http://youtube.com/watch?v=YiYenGM_ttI here].
		+