Allen Mogul Pony Pivot Repair - Revision history

Dnevil: /* The Repair */

2015-03-06T19:26:33Z

The Repair

← Older revision		Revision as of 14:26, 6 March 2015
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	File:MogulPonyPivotRepair 3171.JPG\|The 3/4 inch part is turned around in the three jaw chuck in order to turn the opposite face. The part is turned to 0.5 inches long. A center point is drilled in the part with a #4 HRS center drill		File:MogulPonyPivotRepair 3171.JPG\|The 3/4 inch part is turned around in the three jaw chuck in order to turn the opposite face. The part is turned to 0.5 inches long. A center point is drilled in the part with a #4 HRS center drill
	File:MogulPonyPivotRepair 3174.JPG\|The hole is drilled through with a #10 drill.		File:MogulPonyPivotRepair 3174.JPG\|The hole is drilled through with a #10 drill.
	File:MogulRepairPonyPivot3175.jpg\|The three phase power is turned off to the lathe, the head is disengaged, and the part is threaded to 1/4-20 by manually turning the three jaw chuck. The tap is held in the tailstock. I like to lock the tailstock and gently feed the tap into the part until the threads are well established (about 2 or three turns). Then I losen the tail stock and let the the part "pull in" in the tap the rest of the way. The threads are cut all the way through the 1/2 inch long part.		File:MogulRepairPonyPivot3175.jpg\|The three phase power is turned off to the lathe, the head is disengaged, and the part is threaded to 1/4-20 by manually turning the three jaw chuck. The tap is held in the tailstock. I like to lock the tailstock and gently feed the tap into the part until the threads are well established (about 2 or three turns). Then I losen the tail stock and let the the part "pull in" the tap the rest of the way. The threads are cut all the way through the 1/2 inch long part.
	File:MogulPonyPivonRepair 3176.jpg\|The final operation for this part is to debur the threaded hole. I placed a 7/16 inch drill in the tailstock, and gently applied pressure to the unlocked tailstock while turning the three jaw chuck by hand. One or two turns is all that is necessary. Be careful not to cut too deeply.		File:MogulPonyPivonRepair 3176.jpg\|The final operation for this part is to debur the threaded hole. I placed a 7/16 inch drill in the tailstock, and gently applied pressure to the unlocked tailstock while turning the three jaw chuck by hand. One or two turns is all that is necessary. Be careful not to cut too deeply.
	File:MogulPonyPivotRepair 3181.jpg\|Now we turn our attention to the cover plate. Paint the part with layout fluid and allow to dry. Use an Xacto blade or other scribing tool to layout the five holes to be drilled. Refer to the Allen Mogul drawings. Be sure to verify with direct measurements to the mounting holes in the bottom of the saddle, as the builder may not have precisely following the drawings.		File:MogulPonyPivotRepair 3181.jpg\|Now we turn our attention to the cover plate. Paint the part with layout fluid and allow to dry. Use an Xacto blade or other scribing tool to layout the five holes to be drilled. Refer to the Allen Mogul drawings. Be sure to verify with direct measurements to the mounting holes in the bottom of the saddle, as the builder may not have precisely following the drawings.

Dnevil: /* The Repair */

2015-03-06T19:23:40Z

The Repair

← Older revision		Revision as of 14:23, 6 March 2015
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	<gallery widths="300px" heights="300px">		<gallery widths="300px" heights="300px">
	File:CenterPlateCastingBroken.png\|Broken center plate casting from Allen Mogul #486 after driving over 1/2 inch stick. Photos by Daris A. Nevil.		File:CenterPlateCastingBroken.png\|Broken center plate casting from Allen Mogul #486 after driving over 1/2 inch stick. Photos by [[Daris A Nevil]].
	File:CenterPlateCasting201.png\|An un-machined casting, #201 "Center Plate", from [[Allen Models of Michigan]].		File:CenterPlateCasting201.png\|An un-machined casting, #201 "Center Plate", from [[Allen Models of Michigan]].
	File:CenterPlateCasting with ReplacementSteelComponents.jpg\|A broken #201 casting next to new steel components to be used to fabricate replacement on Allen Mogul #486. The pivot point is cut from 3/4 inch [[CRS]]. I used an abrasive chop saw to rough cut 0.6 inch length part. Cut a 4 inch length of 2 inch by 1/8 inch HRS steel for the plate.		File:CenterPlateCasting with ReplacementSteelComponents.jpg\|A broken #201 casting next to new steel components to be used to fabricate replacement on Allen Mogul #486. The pivot point is cut from 3/4 inch [[CRS]]. I used an abrasive chop saw to rough cut 0.6 inch length part. Cut a 4 inch length of 2 inch by 1/8 inch HRS steel for the plate.

Dnevil at 19:22, 6 March 2015

2015-03-06T19:22:59Z

← Older revision		Revision as of 14:22, 6 March 2015
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	[[Category:Maintenance]]		[[Category:Maintenance]]

	by Daris A. Nevil		by [[Daris A Nevil]]

	I heard stories about how much maintenance goes into a live steam locomotive. Now that I'm an owner I am finding that I have to do some kind of repair or maintenance following almost every run. Most of what I have done has been to improve operation or change operation to my preference. But #486 experienced some real damage on a run at the [[Annetta Valley & Western Railroad]] during a recent run.		I heard stories about how much maintenance goes into a live steam locomotive. Now that I'm an owner I am finding that I have to do some kind of repair or maintenance following almost every run. Most of what I have done has been to improve operation or change operation to my preference. But #486 experienced some real damage on a run at the [[Annetta Valley & Western Railroad]] during a recent run.

Dnevil: /* The Repair */

2013-10-21T18:02:31Z

The Repair

← Older revision		Revision as of 13:02, 21 October 2013
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	<gallery widths="300px" heights="300px">		<gallery widths="300px" heights="300px">
	File:CenterPlateCastingBroken.png\|Broken center plate casting from Allen Mogul #486 after driving over 1/2 inch stick. Photos by Daris A. Nevil.		File:CenterPlateCastingBroken.png\|Broken center plate casting from Allen Mogul #486 after driving over 1/2 inch stick. Photos by Daris A. Nevil.
	File:CenterPlateCasting201.png\|An un-machined casting, #201 "Center Plate", from Allen Models of Michigan.		File:CenterPlateCasting201.png\|An un-machined casting, #201 "Center Plate", from [[Allen Models of Michigan]].
	File:CenterPlateCasting with ReplacementSteelComponents.jpg\|A broken #201 casting next to new steel components to be used to fabricate replacement on Allen Mogul #486. The pivot point is cut from 3/4 inch [[CRS]]. I used an abrasive chop saw to rough cut 0.6 inch length part. Cut a 4 inch length of 2 inch by 1/8 inch HRS steel for the plate.		File:CenterPlateCasting with ReplacementSteelComponents.jpg\|A broken #201 casting next to new steel components to be used to fabricate replacement on Allen Mogul #486. The pivot point is cut from 3/4 inch [[CRS]]. I used an abrasive chop saw to rough cut 0.6 inch length part. Cut a 4 inch length of 2 inch by 1/8 inch HRS steel for the plate.
	File:MogulRepairPonyPivot3170.jpg\|The 3/4 inch round stock is mounted in the three jaw chuck. It is faced at 400RPM and a 1/32 inch chamber is cut around the edge. The part is not faced all the way to the center, as it will be drilled out. This lessens the chance of damaging the cutting tool.		File:MogulRepairPonyPivot3170.jpg\|The 3/4 inch round stock is mounted in the three jaw chuck. It is faced at 400RPM and a 1/32 inch chamber is cut around the edge. The part is not faced all the way to the center, as it will be drilled out. This lessens the chance of damaging the cutting tool.

Dnevil: /* The Repair */

2013-10-14T02:23:32Z

The Repair

← Older revision		Revision as of 21:23, 13 October 2013
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	== The Repair ==		== The Repair ==

	I decided to manufacture my own "Center Plate" from steel components, mainly because I did not want to wait for a replacement part. I also wanted a stronger material than cast aluminum~~. I also~~ decided to reduce the diameter of the pivot so the pony truck would have more vertical freedom.		I decided to manufacture my own "Center Plate" from steel components, mainly because I did not want to wait for a replacement part. I also wanted a stronger material than cast aluminum and decided to reduce the diameter of the pivot so the pony truck would have more vertical freedom.

	The photos below show how I made the replacement parts.		The photos below show how I made the replacement parts.

Dnevil: /* The Incident */

2013-10-13T05:08:53Z

The Incident

← Older revision		Revision as of 00:08, 13 October 2013
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	== The Incident ==		== The Incident ==

	A cool front blew through north Texas August 17, 2013. It was the first break in the heat all summer, so I took advantage of the opportunity. I made the first run on the track that morning. Unfortunately, the track had not been "walked", and as #486 began its climb out of [[Bob_Grey#Stamey_Loop\|Stamey Loop]] I noticed a 1/2 inch stick across the rails. I didn't have time to stop, and hoped the cow-catcher would throw the stick clear of the tracks. Well, it didn't, and old #486 went right over it. The pony truck went right over it, followed by all six drivers. They didn't event derail! But the tender did, so I stopped to clear the track and re-rail. All seemed ~~find~~, but I found that the pony truck kept derailing in curves. Another engineer passing by pointed out that #486's pony truck was not tracking straight. I got down on my hands and knees and noticed the pony truck pivot pin was missing.		A cool front blew through north Texas August 17, 2013. It was the first break in the heat all summer, so I took advantage of the opportunity. I made the first run on the track that morning. Unfortunately, the track had not been "walked", and as #486 began its climb out of [[Bob_Grey#Stamey_Loop\|Stamey Loop]] I noticed a 1/2 inch stick across the rails. I didn't have time to stop, and hoped the cow-catcher would throw the stick clear of the tracks. Well, it didn't, and old #486 went right over it. The pony truck went right over it, followed by all six drivers. They didn't event derail! But the tender did, so I stopped to clear the track and re-rail. All seemed fine, but I found that the pony truck kept derailing in curves. Another engineer passing by pointed out that #486's pony truck was not tracking straight. I got down on my hands and knees and noticed the pony truck pivot pin was missing.

	By this time I was far from the engine stands. The same helpful engineer suggested I run backwards back to Terry Town Station. That worked like a charm, and I didn't derail anymore.		By this time I was far from the engine stands. The same helpful engineer suggested I run backwards back to Terry Town Station. That worked like a charm, and I didn't derail anymore.

Dnevil: /* The Incident */

2013-10-13T05:07:26Z

The Incident

← Older revision		Revision as of 00:07, 13 October 2013
Line 8:		Line 8:
	== The Incident ==		== The Incident ==

	A cool front blew through north Texas August 17, 2013. It was the first break in the heat all summer, so I took advantage of the opportunity. I made the first run on the track that morning. Unfortunately, the track had not been "walked", and as #486 began its climb out of [[Bob_Grey#Stamey_Loop\|Stamey Loop]] I noticed a 1/2 inch stick across the rails. I didn't have time to stop, and hoped the cow-catcher would throw the stick ~~clearn~~ of the tracks. Well, it didn't, and old #486 went right over it. The pony truck went right over it, followed by all six drivers. They didn't event derail! But the tender did, so I stopped to clear the track and re-rail. All seemed find, but I found that the pony truck kept derailing in curves. Another engineer passing by pointed out that #486's pony truck was not tracking straight. I got down on my hands and knees and noticed the pony truck pivot pin was missing.		A cool front blew through north Texas August 17, 2013. It was the first break in the heat all summer, so I took advantage of the opportunity. I made the first run on the track that morning. Unfortunately, the track had not been "walked", and as #486 began its climb out of [[Bob_Grey#Stamey_Loop\|Stamey Loop]] I noticed a 1/2 inch stick across the rails. I didn't have time to stop, and hoped the cow-catcher would throw the stick clear of the tracks. Well, it didn't, and old #486 went right over it. The pony truck went right over it, followed by all six drivers. They didn't event derail! But the tender did, so I stopped to clear the track and re-rail. All seemed find, but I found that the pony truck kept derailing in curves. Another engineer passing by pointed out that #486's pony truck was not tracking straight. I got down on my hands and knees and noticed the pony truck pivot pin was missing.

	By this time I was far from the engine stands. The same helpful engineer suggested I run backwards back to Terry Town Station. That worked like a charm, and I didn't derail anymore.		By this time I was far from the engine stands. The same helpful engineer suggested I run backwards back to Terry Town Station. That worked like a charm, and I didn't derail anymore.

Dnevil: /* The Repair */

2013-10-13T05:06:19Z

The Repair

← Older revision		Revision as of 00:06, 13 October 2013
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	File:MogulPonyPivotRepair 3184.jpg\|Center punch the four outer holes in the cover plate. Make a pilot dimple for each hole using a #2 HRS center drill. Drill through each of the four corner holes with a 3/16 inch drill. Debur the four corner holes, front and back, using a 1/4 inch drill. Drill the center hole with a 1/4 inch drill. Debur front and back with a 3/8 inch drill. The photo shows the newly completed parts next to the broken casting.		File:MogulPonyPivotRepair 3184.jpg\|Center punch the four outer holes in the cover plate. Make a pilot dimple for each hole using a #2 HRS center drill. Drill through each of the four corner holes with a 3/16 inch drill. Debur the four corner holes, front and back, using a 1/4 inch drill. Drill the center hole with a 1/4 inch drill. Debur front and back with a 3/8 inch drill. The photo shows the newly completed parts next to the broken casting.
	File:MogulPonyPivotRepair 3188.jpg\|The new components are assembled for a test fit on the pony truck. A 1/4-20 bolt is inserted through the backside of the cover plate. The pivot is threaded onto the bolt and tightened. A lock washer and self locking bolt complete the assembly. The original drawings specify using a much longer pivot bolt with a spring arrangement. I felt the bolt came too close to the track. By reducing the diameter of the pivot point the truck naturally has more room to "wiggle" (especially vertically). Notice the bolt is not tightened onto the lock washer. The lock washer is acting as a small spring in this case to keep the pony truck pushed up against the pivot point.		File:MogulPonyPivotRepair 3188.jpg\|The new components are assembled for a test fit on the pony truck. A 1/4-20 bolt is inserted through the backside of the cover plate. The pivot is threaded onto the bolt and tightened. A lock washer and self locking bolt complete the assembly. The original drawings specify using a much longer pivot bolt with a spring arrangement. I felt the bolt came too close to the track. By reducing the diameter of the pivot point the truck naturally has more room to "wiggle" (especially vertically). Notice the bolt is not tightened onto the lock washer. The lock washer is acting as a small spring in this case to keep the pony truck pushed up against the pivot point.
			File:MogulPonyPivotRepair 3190.jpg\|This image shows the new cover plate assembly in place at the bottom of the saddle.
	</gallery>		</gallery>

			== Test Results ==

			I am happy to report that the next run of #486 was a successful one. The repair is working well, and is keeping the pony truck in its place.

Dnevil: /* The Repair */

2013-10-13T05:01:38Z

The Repair

← Older revision		Revision as of 00:01, 13 October 2013
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	File:MogulPonyPivonRepair 3176.jpg\|The final operation for this part is to debur the threaded hole. I placed a 7/16 inch drill in the tailstock, and gently applied pressure to the unlocked tailstock while turning the three jaw chuck by hand. One or two turns is all that is necessary. Be careful not to cut too deeply.		File:MogulPonyPivonRepair 3176.jpg\|The final operation for this part is to debur the threaded hole. I placed a 7/16 inch drill in the tailstock, and gently applied pressure to the unlocked tailstock while turning the three jaw chuck by hand. One or two turns is all that is necessary. Be careful not to cut too deeply.
	File:MogulPonyPivotRepair 3181.jpg\|Now we turn our attention to the cover plate. Paint the part with layout fluid and allow to dry. Use an Xacto blade or other scribing tool to layout the five holes to be drilled. Refer to the Allen Mogul drawings. Be sure to verify with direct measurements to the mounting holes in the bottom of the saddle, as the builder may not have precisely following the drawings.		File:MogulPonyPivotRepair 3181.jpg\|Now we turn our attention to the cover plate. Paint the part with layout fluid and allow to dry. Use an Xacto blade or other scribing tool to layout the five holes to be drilled. Refer to the Allen Mogul drawings. Be sure to verify with direct measurements to the mounting holes in the bottom of the saddle, as the builder may not have precisely following the drawings.
			File:MogulPonyPivotRepair 3184.jpg\|Center punch the four outer holes in the cover plate. Make a pilot dimple for each hole using a #2 HRS center drill. Drill through each of the four corner holes with a 3/16 inch drill. Debur the four corner holes, front and back, using a 1/4 inch drill. Drill the center hole with a 1/4 inch drill. Debur front and back with a 3/8 inch drill. The photo shows the newly completed parts next to the broken casting.
			File:MogulPonyPivotRepair 3188.jpg\|The new components are assembled for a test fit on the pony truck. A 1/4-20 bolt is inserted through the backside of the cover plate. The pivot is threaded onto the bolt and tightened. A lock washer and self locking bolt complete the assembly. The original drawings specify using a much longer pivot bolt with a spring arrangement. I felt the bolt came too close to the track. By reducing the diameter of the pivot point the truck naturally has more room to "wiggle" (especially vertically). Notice the bolt is not tightened onto the lock washer. The lock washer is acting as a small spring in this case to keep the pony truck pushed up against the pivot point.
	</gallery>		</gallery>

Dnevil: /* The Repair */

2013-10-13T04:49:00Z

The Repair

← Older revision		Revision as of 23:49, 12 October 2013
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	File:MogulPonyPivotRepair 3174.JPG\|The hole is drilled through with a #10 drill.		File:MogulPonyPivotRepair 3174.JPG\|The hole is drilled through with a #10 drill.
	File:MogulRepairPonyPivot3175.jpg\|The three phase power is turned off to the lathe, the head is disengaged, and the part is threaded to 1/4-20 by manually turning the three jaw chuck. The tap is held in the tailstock. I like to lock the tailstock and gently feed the tap into the part until the threads are well established (about 2 or three turns). Then I losen the tail stock and let the the part "pull in" in the tap the rest of the way. The threads are cut all the way through the 1/2 inch long part.		File:MogulRepairPonyPivot3175.jpg\|The three phase power is turned off to the lathe, the head is disengaged, and the part is threaded to 1/4-20 by manually turning the three jaw chuck. The tap is held in the tailstock. I like to lock the tailstock and gently feed the tap into the part until the threads are well established (about 2 or three turns). Then I losen the tail stock and let the the part "pull in" in the tap the rest of the way. The threads are cut all the way through the 1/2 inch long part.
			File:MogulPonyPivonRepair 3176.jpg\|The final operation for this part is to debur the threaded hole. I placed a 7/16 inch drill in the tailstock, and gently applied pressure to the unlocked tailstock while turning the three jaw chuck by hand. One or two turns is all that is necessary. Be careful not to cut too deeply.
			File:MogulPonyPivotRepair 3181.jpg\|Now we turn our attention to the cover plate. Paint the part with layout fluid and allow to dry. Use an Xacto blade or other scribing tool to layout the five holes to be drilled. Refer to the Allen Mogul drawings. Be sure to verify with direct measurements to the mounting holes in the bottom of the saddle, as the builder may not have precisely following the drawings.
	</gallery>		</gallery>

← Older revision		Revision as of 14:26, 6 March 2015
Line 29:		Line 29:
	File:MogulPonyPivotRepair 3171.JPG\|The 3/4 inch part is turned around in the three jaw chuck in order to turn the opposite face. The part is turned to 0.5 inches long. A center point is drilled in the part with a #4 HRS center drill		File:MogulPonyPivotRepair 3171.JPG\|The 3/4 inch part is turned around in the three jaw chuck in order to turn the opposite face. The part is turned to 0.5 inches long. A center point is drilled in the part with a #4 HRS center drill
	File:MogulPonyPivotRepair 3174.JPG\|The hole is drilled through with a #10 drill.		File:MogulPonyPivotRepair 3174.JPG\|The hole is drilled through with a #10 drill.
	File:MogulRepairPonyPivot3175.jpg\|The three phase power is turned off to the lathe, the head is disengaged, and the part is threaded to 1/4-20 by manually turning the three jaw chuck. The tap is held in the tailstock. I like to lock the tailstock and gently feed the tap into the part until the threads are well established (about 2 or three turns). Then I losen the tail stock and let the the part "pull in" in the tap the rest of the way. The threads are cut all the way through the 1/2 inch long part.		File:MogulRepairPonyPivot3175.jpg\|The three phase power is turned off to the lathe, the head is disengaged, and the part is threaded to 1/4-20 by manually turning the three jaw chuck. The tap is held in the tailstock. I like to lock the tailstock and gently feed the tap into the part until the threads are well established (about 2 or three turns). Then I losen the tail stock and let the the part "pull in" the tap the rest of the way. The threads are cut all the way through the 1/2 inch long part.
	File:MogulPonyPivonRepair 3176.jpg\|The final operation for this part is to debur the threaded hole. I placed a 7/16 inch drill in the tailstock, and gently applied pressure to the unlocked tailstock while turning the three jaw chuck by hand. One or two turns is all that is necessary. Be careful not to cut too deeply.		File:MogulPonyPivonRepair 3176.jpg\|The final operation for this part is to debur the threaded hole. I placed a 7/16 inch drill in the tailstock, and gently applied pressure to the unlocked tailstock while turning the three jaw chuck by hand. One or two turns is all that is necessary. Be careful not to cut too deeply.
	File:MogulPonyPivotRepair 3181.jpg\|Now we turn our attention to the cover plate. Paint the part with layout fluid and allow to dry. Use an Xacto blade or other scribing tool to layout the five holes to be drilled. Refer to the Allen Mogul drawings. Be sure to verify with direct measurements to the mounting holes in the bottom of the saddle, as the builder may not have precisely following the drawings.		File:MogulPonyPivotRepair 3181.jpg\|Now we turn our attention to the cover plate. Paint the part with layout fluid and allow to dry. Use an Xacto blade or other scribing tool to layout the five holes to be drilled. Refer to the Allen Mogul drawings. Be sure to verify with direct measurements to the mounting holes in the bottom of the saddle, as the builder may not have precisely following the drawings.

← Older revision		Revision as of 13:02, 21 October 2013
Line 24:		Line 24:
	<gallery widths="300px" heights="300px">		<gallery widths="300px" heights="300px">
	File:CenterPlateCastingBroken.png\|Broken center plate casting from Allen Mogul #486 after driving over 1/2 inch stick. Photos by Daris A. Nevil.		File:CenterPlateCastingBroken.png\|Broken center plate casting from Allen Mogul #486 after driving over 1/2 inch stick. Photos by Daris A. Nevil.
	File:CenterPlateCasting201.png\|An un-machined casting, #201 "Center Plate", from Allen Models of Michigan.		File:CenterPlateCasting201.png\|An un-machined casting, #201 "Center Plate", from [[Allen Models of Michigan]].
	File:CenterPlateCasting with ReplacementSteelComponents.jpg\|A broken #201 casting next to new steel components to be used to fabricate replacement on Allen Mogul #486. The pivot point is cut from 3/4 inch [[CRS]]. I used an abrasive chop saw to rough cut 0.6 inch length part. Cut a 4 inch length of 2 inch by 1/8 inch HRS steel for the plate.		File:CenterPlateCasting with ReplacementSteelComponents.jpg\|A broken #201 casting next to new steel components to be used to fabricate replacement on Allen Mogul #486. The pivot point is cut from 3/4 inch [[CRS]]. I used an abrasive chop saw to rough cut 0.6 inch length part. Cut a 4 inch length of 2 inch by 1/8 inch HRS steel for the plate.
	File:MogulRepairPonyPivot3170.jpg\|The 3/4 inch round stock is mounted in the three jaw chuck. It is faced at 400RPM and a 1/32 inch chamber is cut around the edge. The part is not faced all the way to the center, as it will be drilled out. This lessens the chance of damaging the cutting tool.		File:MogulRepairPonyPivot3170.jpg\|The 3/4 inch round stock is mounted in the three jaw chuck. It is faced at 400RPM and a 1/32 inch chamber is cut around the edge. The part is not faced all the way to the center, as it will be drilled out. This lessens the chance of damaging the cutting tool.