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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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How to attach a rod to a grass trimmer crankshaft?
https://lh3.googleusercontent.com/-R...November272012
I sloppily removed the clutch contraption, apparently without functional damage to the grass trimmer. I need to attach a 1/4 inch aluminum rod to that threaded bolt sticking out from the crankshaft. Looks like it uses an uncommon 5/16"-20 bolt. Any common or easy to get small plastic or metal parts threaded 5/16"-20? A workaround (see the picture)... I suppose some plastic or aluminum could be stuck over the bolt and glued onto the base. And then the trimmer could be started and used like a lathe to cut a hole for the 1/4 inch aluminum rod that it will drive. That assumes the base is sturdy enough to twist the rod. If so, maybe the bolt could be cut off to reduce the depth of the additional material. Apparently the shiny metal piece stuck on the black plastic is used for timing the engine. With the opposite side of that metal piece being there for a counterbalance. That's my guess. Thanks. |
#2
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How to attach a rod to a grass trimmer crankshaft?
On Wednesday, November 28, 2012 12:05:23 AM UTC-5, John Doe wrote:
https://lh3.googleusercontent.com/-R...November272012 I sloppily removed the clutch contraption, apparently without functional damage to the grass trimmer. I need to attach a 1/4 inch aluminum rod to that threaded bolt sticking out from the crankshaft. Looks like it uses an uncommon 5/16"-20 bolt. Any common or easy to get small plastic or metal parts threaded 5/16"-20? A workaround (see the picture)... I suppose some plastic or aluminum could be stuck over the bolt and glued onto the base. And then the trimmer could be started and used like a lathe to cut a hole for the 1/4 inch aluminum rod that it will drive. That assumes the base is sturdy enough to twist the rod. If so, maybe the bolt could be cut off to reduce the depth of the additional material. Apparently the shiny metal piece stuck on the black plastic is used for timing the engine. With the opposite side of that metal piece being there for a counterbalance. That's my guess. Thanks. http://www1.mscdirect.com/cgi/NNSRIT...-SearchResults |
#3
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How to attach a rod to a grass trimmer crankshaft?
On Tue, 27 Nov 2012 22:19:41 -0800 (PST), rangerssuck
wrote: On Wednesday, November 28, 2012 12:05:23 AM UTC-5, John Doe wrote: https://lh3.googleusercontent.com/-R...November272012 I need to attach a 1/4 inch aluminum rod to that threaded bolt sticking out from the crankshaft. Looks like it uses an uncommon 5/16"-20 bolt. http://www1.mscdirect.com/cgi/NNSRIT...-SearchResults It's almost certainly an M8 thread. The standard M8 pitch is 1.25mm. 5/16 = 7.94mm 20 TPI = 1.27 mm -- Ned Simmons |
#4
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How to attach a rod to a grass trimmer crankshaft?
Ned Simmons news nedsim.com wrote:
It's almost certainly an M8 thread. The standard M8 pitch is 1.25mm. 5/16 = 7.94mm 20 TPI = 1.27 mm Right, I'm just looking at the wrong standards, thanks. |
#5
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How to attach a rod to a grass trimmer crankshaft?
Inexpensive 1/2 inch socket
M8 1.25 nut (fits near perfectly into the socket) 5/16" bolt head Stick the bolt head (bolt part) into a $1000 metal lathe (or a $60 drill press) and tap for the 1/4 inch aluminum rod. Cut off any excess bolt part that still hanging on. Thread it. Thread the end of the 1/4 inch aluminum rod. Stick it through the socket. Screw the bolt head onto it. Pull it back into the socket opposite the business end. Screw the M8 nut onto the grass trimmer crankshaft bolt. Stick the socket head over it and glue it. The only radial pressure will be very slight. -- John Doe jdoe usenetlove.invalid wrote: https://lh3.googleusercontent.com/-R...November272012 I sloppily removed the clutch contraption, apparently without functional damage to the grass trimmer. I need to attach a 1/4 inch aluminum rod to that threaded bolt sticking out from the crankshaft. Looks like it uses an uncommon 5/16"-20 bolt. Any common or easy to get small plastic or metal parts threaded 5/16"-20? A workaround (see the picture)... I suppose some plastic or aluminum could be stuck over the bolt and glued onto the base. And then the trimmer could be started and used like a lathe to cut a hole for the 1/4 inch aluminum rod that it will drive. That assumes the base is sturdy enough to twist the rod. If so, maybe the bolt could be cut off to reduce the depth of the additional material. Apparently the shiny metal piece stuck on the black plastic is used for timing the engine. With the opposite side of that metal piece being there for a counterbalance. That's my guess. Thanks. |
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