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Build Your Own Prop Puller |
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eric lavine 
Grand Poobah 
Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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 Posted: February-17-2009 at 10:18am |
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I use to be the first to jump at projects, then i find myself pulling in at 10:00 at night, you know my friend left me this car and it really is one of a kind but it needs some work and Im committing 2 hours a night to it...somehow, someway he is looking down with a smerk, it really is the last thing i need to be doing, Im hoping to have it done by July for a road trip North to Kringle land
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"the things you own will start to own you"
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MI-nick
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Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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Posted: February-19-2009 at 3:37pm |
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Pete,
I like your puller. I agree it probably puts a more uniform load on the prop hub. But, Bill's puller fit's my needs better (mainly from a manufacturing standpoint...i don't have the resources to easily build one like your's the way it should be built). I think if Bill's style is aligned correctly and the puller body is as rigid as possible, the uneven load on the prob hub (and bending of the puller) can be minimized. Many of this style have been used successfully and this is also the style the major prop manufactures sell...so it must be at least adequate... I though about calculating the max bending moment on the puller using the stripping torque for a 3/4-10 grade 8 nut and designing for min deflection...but, I think "seat of the pants" engineering is Ok for this job. I may increase the thickness from 1/4" to 5/16" or even 3/8" and i'll definitely add gussets where possible. I'll let you guys know how it works out. |
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As far as I can tell, I'm not quite sure...
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MI-nick
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Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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Posted: February-23-2009 at 3:16pm |
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I made my puller last weekend. I made two changes from Bill's design.
1) puller "claw" from 2 piece to 1 piece. I think it's a little stronger this way. 2) increased width of the puller body from 1" -> 2" (increased resistance to bending). I also made a jig to keep the claw and the nut in alignment during welding. I drilled the center of the bolt, but still need to add a steel rod to keep the bolt centered on the prop shaft. I wanted to add some more weld/reinforcement to the nut area (i think this is the weak link) but ran out of sheilding gas and the welding supply store was closed. I think it came out pretty good. Thanks Bill for how-to!! Puller Body 
Jig with claw tacked on 
Tacking jig to puller body 
Welding claw and nut 
Finished Product 
What my backyard looked like that day 
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As far as I can tell, I'm not quite sure...
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SNobsessed
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Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Posted: February-23-2009 at 9:16pm |
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MI-nick - You might want some more weld on that nut, looks like the weakest link.
Otherwise it looks like it should pull hard! |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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