Ford edis with megajolt - Page 22

WingsOnWheels · #**211** 11-27-2019, 11:44 PM

So, I have slowly continued on with this project for my plane. I decided to go with a mag-hole trigger. I have sourced most of the parts and designed the assembly. Obviously this is a copy of Dan's setup, though I don't know all his details, so I'm sure there are plenty of small differences.

I have one dimension I failed to gather while I had my mag off, and that is the exact position of the Mag gear face relative to the shaft shoulder, so I haven't finished that portion of the design.

WingsOnWheels · #**212** 12-05-2019, 11:36 PM

I had some fun this week after work. Machined the body for the mag replacement. I am still waiting on a couple of parts, but it is coming together nicely.

DanH · #**213** 12-06-2019, 06:37 AM

Like the o-ring accessory case seal. Nice touch, should have done that to mine.

The snap ring will be hard to install with the toothed wheel pinned to the shaft.

The 25x15x12 spacer must also be pinned to the shaft. If not, the shaft can shift axially in the bearings.

WingsOnWheels · #**214** 12-06-2019, 07:39 AM

Dan, all good feedback. The spacer is a shaft collar, so it does retain the shaft. Yes, the gear will have to be removed in order to remove the snap ring, but that shouldn't be a problem. The shaft has two existing holes from where the magnet was attached, I'm hopeful those will line up close enough to be used for the gear retention, but I missed one critical dimension when I pulled my mag to measure, so I don't know for sure yet.

DanH · #**215** 12-06-2019, 09:31 AM

Quote:

Originally Posted by WingsOnWheels

Dan, all good feedback. The spacer is a shaft collar, so it does retain the shaft.

Set screws? Better with a roll pin.

Quote:

Yes, the gear will have to be removed in order to remove the snap ring, but that shouldn't be a problem. The shaft has two existing holes from where the magnet was attached, I'm hopeful those will line up close enough to be used for the gear retention, but I missed one critical dimension when I pulled my mag to measure, so I don't know for sure yet.

I briefly considered attaching the wheel as Electroair does, i.e. a center screw and a tiny index pin. In the end I elected to cross pin it like the bearing spacer, as it allows the use of a press fit at the wheel-to-shaft interface. The cross pin is insurance.

Using a surface retainer (the black bar below) allows dropping a complete assembly into the body cavity.

WingsOnWheels · #**216** 12-06-2019, 01:03 PM

That is why I am hoping the existing holes in the shaft will align with the gear. Right now it looks like it will be very close. My plan depends a bit on that alignment. Either a slot in the botton of the gear that will fit over a roll pin in the shaft and a bolt on top, or a threaded pin in place of the set scew if all the planets align.

For the shaft collar I am replacing the set screw with a threaded shear pin that will fit into a hole in the shaft.

The lower bearing in my assembly is and interference fit with the housing, while the upper is a slip-fit. So the lower bearing is installed first, then everything else drops in on top of that.

WingsOnWheels · #**217** 12-06-2019, 01:29 PM

Dan,

Do you happen to know either:
The distance from the shaft shoulder to the face of the mag drive gear, or the distance from the magneto-to-acc housing face to the shaft shoulder? I failed to get that measurement when I pulled my mag.

DanH · #**218** 12-06-2019, 03:26 PM

Quote:

Originally Posted by WingsOnWheels

Dan,

Do you happen to know either:
The distance from the shaft shoulder to the face of the mag drive gear, or the distance from the magneto-to-acc housing face to the shaft shoulder? I failed to get that measurement when I pulled my mag.

Not sure of what your mean by "shaft shoulder". Got a drawing for dummies?

WingsOnWheels · #**219** 12-06-2019, 04:02 PM

Quote:

Originally Posted by DanH

Not sure of what your mean by "shaft shoulder". Got a drawing for dummies?

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.

DanH · #**220** 12-06-2019, 04:37 PM

Quote:

Originally Posted by WingsOnWheels

The shoulder 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.

I did not accurately reference that location. I referenced the mounted and torqued drive gear to the accessory case sealing surface. My drawings say 29mm from seal surface to center of the gear tooth width.