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  #231  
Old 01-02-2020, 05:13 PM
rwtalbot rwtalbot is offline
 
Join Date: Feb 2006
Location: Sydney, Australia
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Default Removing the rotor?

How do you remove the magnet/rotor assembly from the shaft? Is it a press fit?

Thanks
Richard
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  #232  
Old 01-02-2020, 08:46 PM
WingsOnWheels WingsOnWheels is offline
 
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Location: Plano, TX
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Originally Posted by rwtalbot View Post
How do you remove the magnet/rotor assembly from the shaft? Is it a press fit?

Thanks
Richard
The one i used was from a slick mag. I tried to machine it off with poor results. Then i realized it is cast on (maybe aluminum) with the magnets embedded in the casting. I ended up just melting it off with a propane torch. Then there were two brass rivets that I drilled out.
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Last edited by WingsOnWheels : 01-02-2020 at 08:50 PM.
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  #233  
Old 01-02-2020, 08:49 PM
WingsOnWheels WingsOnWheels is offline
 
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Location: Plano, TX
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Where are you guys mounting your coils? In the upper plenum area would make for short plug wires (for one set), plus it is pretty cool during flight. On the other hand, on the firewall gets them away from the vibration.
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  #234  
Old 01-02-2020, 09:15 PM
lr172 lr172 is offline
 
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Originally Posted by WingsOnWheels View Post
Where are you guys mounting your coils? In the upper plenum area would make for short plug wires (for one set), plus it is pretty cool during flight. On the other hand, on the firewall gets them away from the vibration.
On the 6, I put the coil on the firewall. Not enough room to put on top of the engine with the coil type I had (top facing posts). On the 10, I put one on top of the engine and the other on top of the engine mount. The 10 cowl area has a lot more room to work with though.

Larry
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  #235  
Old 01-02-2020, 10:00 PM
WingsOnWheels WingsOnWheels is offline
 
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Originally Posted by lr172 View Post
On the 6, I put the coil on the firewall. Not enough room to put on top of the engine with the coil type I had (top facing posts). On the 10, I put one on top of the engine and the other on top of the engine mount. The 10 cowl area has a lot more room to work with though.

Larry
Thanks for the input. I think i am going to mount them to the engine mount on angle atrached via cushion clamps. I could always move thrm to the firewall later, but this looks to be the most modular and least intrusive.
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  #236  
Old 01-03-2020, 12:37 AM
rwtalbot rwtalbot is offline
 
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Quote:
Originally Posted by WingsOnWheels View Post
The one i used was from a slick mag. I tried to machine it off with poor results. Then i realized it is cast on (maybe aluminum) with the magnets embedded in the casting. I ended up just melting it off with a propane torch. Then there were two brass rivets that I drilled out.
Thanks Colin, I had issues with the first one too. On the second one I found an angle grinder removed most of it. I then carefully removed the remainder with the lathe.
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  #237  
Old 01-03-2020, 02:06 PM
WingsOnWheels WingsOnWheels is offline
 
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Originally Posted by rwtalbot View Post
Thanks Colin, I had issues with the first one too. On the second one I found an angle grinder removed most of it. I then carefully removed the remainder with the lathe.
The torch ended up working great. Took just a couple minutes and everything came off clean.
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  #238  
Old 01-03-2020, 05:26 PM
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rocketbob rocketbob is offline
 
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Originally Posted by WingsOnWheels View Post
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.
Yes that would be great.

Would like a drawing of the shaft as well. I think it would be ok to make it out of 4140 or 8620 steel.
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  #239  
Old 01-08-2020, 08:08 PM
WingsOnWheels WingsOnWheels is offline
 
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Originally Posted by rocketbob View Post
Yes that would be great.

Would like a drawing of the shaft as well. I think it would be ok to make it out of 4140 or 8620 steel.

Bob,

Sorry for the delay. Here is my housing drawing in inches. I don't have a detail drawing of the shaft since I repurposed one from a slick mag.

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  #240  
Old 01-14-2020, 03:38 AM
rwtalbot rwtalbot is offline
 
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Originally Posted by WingsOnWheels View Post
Bob,

Sorry for the delay. Here is my housing drawing in inches.
Interesting, so you have an O-ring seal at the top or is that grove for bearing retention?

How are you attaching the gear to the shaft? Loctite 638 might be an option with interference fit, or is there still room for a grub screw? There must be a secure solution involving a minimum of machining. It looks like Dan may have used grub screws.
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