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  #221  
Old 12-06-2019, 06:39 PM
WingsOnWheels WingsOnWheels is offline
 
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Thanks Dan, I took that same measurement. I just don't have a spare gear, so I'll have to wait until I pull mag again.
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  #222  
Old 12-07-2019, 11:20 PM
lr172 lr172 is offline
 
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Quote:
Originally Posted by WingsOnWheels View Post
The sholder where the shaft taper transitions to the threaded portion for the mag drive gear. Basically I need to figure out the position of the mag drive gear on the shaft. Hoping to do so without pulling the mag again, but that may be what I have to do.
A caution here. The gear is secured via a morse taper interference fit. The gear goes on as far as the morse taper interface allows it. The gear is not secured or stopped by butting up to a step. When I made one, I cut the taper on the shaft first, put a gear on it and then took measurements from the gear as I worked up the shaft. I suspect you could take the ID at the large side of the gear bore and use that as a reference when machining the taper to place the gear, if all of the other machining is already done. I would not try machining the taper without a test gear in hand. Once you get the angles and cross slide set for the taper (cut longer than what you need), you can just move along the x axis a specific amount after test fitting the gear. A more experienced machinist I am sure would be more confident in just putting the end of the taper in a specific spot, if the gears taper precision could be trusted.


Good luck.

Larry
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Last edited by lr172 : 12-07-2019 at 11:30 PM.
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  #223  
Old 12-08-2019, 06:42 AM
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DanH DanH is offline
 
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Colin isn't cutting a taper. The idea here is to re-purpose shafts taken from old mags...with an existing taper, keyway and threads.
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  #224  
Old 12-08-2019, 09:46 PM
WingsOnWheels WingsOnWheels is offline
 
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Location: Plano, TX
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Good advice Larry, but as Dan noted, this is a repurposed magneto drive, saves a bit of work over making one. I don't have a quick change gearbox on my lathe, so setup for thread citting takes forever.

I'll just have to pull the Mag and take the measurements. With 2 little ones and a decent drive to the airport, I'm lucky to get up there once a week.
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RV-6A #20603
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I donate every year on my B-Day (in Dec), but donated early in Sep'19.
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  #225  
Old 12-13-2019, 04:34 PM
WingsOnWheels WingsOnWheels is offline
 
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I received the gear I ordered and modified it to use for timing. Also installed the pickup. Took the assembly for a spin on the lathe.



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Colin P.
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I donate every year on my B-Day (in Dec), but donated early in Sep'19.

Last edited by WingsOnWheels : 12-14-2019 at 10:21 AM.
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  #226  
Old 01-01-2020, 10:04 PM
WingsOnWheels WingsOnWheels is offline
 
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Dan,

What wire gauge did you use for the coil pack? The megajolt manual recommends 14awg, but that seems like way overkill given the reported current draw. Also, 14awg shielded is proving hard to find. 16awg should be plenty sufficient. Thoughts?

On a side note, pickup assembly is all together and ready to roll. Need to get the rest of the system wired

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Colin P.
RV-6A #20603
Complete 5/10/19
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I donate every year on my B-Day (in Dec), but donated early in Sep'19.

Last edited by WingsOnWheels : 01-02-2020 at 06:03 PM.
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  #227  
Old 01-02-2020, 07:58 AM
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DanH DanH is offline
 
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Quote:
Originally Posted by WingsOnWheels View Post
Dan, What wire gauge did you use for the coil pack?
I've slept since then, but pretty sure it is 3-conductor shielded 18, straight from the Spruce catalog.

Quote:
...pickup assembly is all together and ready to roll.
Nice.
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  #228  
Old 01-02-2020, 08:18 AM
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rocketbob rocketbob is offline
 
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I'm too lazy to go thru the thread but I would like to make a couple of these on my CNC turret lathe. Can someone point me to a non-metric drawing or a Solidworks file?
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Last edited by rocketbob : 01-02-2020 at 08:28 AM.
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  #229  
Old 01-02-2020, 04:12 PM
WingsOnWheels WingsOnWheels is offline
 
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Quote:
Originally Posted by airtractor8 View Post
Thanks guys. Great information.

I'm thinking at this point I will probably just get an 8 cylinder plug new from your side of the pond (half the price of UK) and cut the keys of it as Kirk suggested.

Be nice to have one that has NOT been pre wired like this one or a source for replacement female pins perhaps? Any Ideas?

I bought the new EDIS 8 connector off ebay for $19. I was able to remove the pins from the cut-off EDIS4 module (bought used). Now I can use the pins that came with the new connector with the edis4 body, so no cutting the keys.

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Complete 5/10/19
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I donate every year on my B-Day (in Dec), but donated early in Sep'19.
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  #230  
Old 01-02-2020, 06:08 PM
WingsOnWheels WingsOnWheels is offline
 
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Quote:
Originally Posted by rocketbob View Post
I'm too lazy to go thru the thread but I would like to make a couple of these on my CNC turret lathe. Can someone point me to a non-metric drawing or a Solidworks file?
I'm happy to repost my drawing in inches. However, my setup is yet untested. Also, I made a few minor tweaks that aren't on the drawing. I made the o-ring grooves slightly deeper and made the engine-side bearing press fit and the aft bearing slip-fit.
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Complete 5/10/19
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I donate every year on my B-Day (in Dec), but donated early in Sep'19.
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