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  #1  
Old 02-21-2022, 12:10 PM
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Steve Crewdog Steve Crewdog is offline
 
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Default Anti-rotation notches for switches- overkill?

I notice the standard toggle switches have a notch for the switch labels to fit and lock in so they don't turn, does anyone also cut the hole in the panel smaller and then enlarge with this notch like on the starter switch?

Or am I going off the deep end?


Thanks
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  #2  
Old 02-21-2022, 12:15 PM
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Mike S Mike S is offline
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That is a lot of work, a toggle switch doesnt get twisted like a key switch.

Most of the toggle switches I have seen also have an anti-rotation device that is used with a small hole next to the mounting hole. Lots easier than trying to file out the mounting hole and leave a tab in place. https://www.steinair.com/product/12mm-locking-ring/
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  #3  
Old 02-21-2022, 12:19 PM
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Steve Crewdog Steve Crewdog is offline
 
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Quote:
Originally Posted by Mike S View Post
That is a lot of work, a toggle switch doesnt get twisted like a key switch.

Most of the toggle switches I have seen also have an anti-rotation device that is used with a small hole next to the mounting hole. Lots easier than trying to file out the mounting hole and leave a tab in place. https://www.steinair.com/product/12mm-locking-ring/
Thank you for the sanity check, Mike. :cheers:
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  #4  
Old 02-21-2022, 01:08 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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I just drilled a round hole for my ACS key switch. Hasn't rotated significantly in 600 hours/8 years of flying.
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  #5  
Old 02-21-2022, 06:08 PM
rocketman1988 rocketman1988 is offline
 
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Default And

Another optio is to use an internal lock washer on both sides of the panel.
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  #6  
Old 02-21-2022, 06:47 PM
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Default Anto rotation

I plan to fabricate an anti rotation strip. Basically a strip of aluminum the thickness of the anti rotation tab. Holes for the switches and holes drilled for the tabs. Lives behind the panel. No need to drill tiny holes in the panel.
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  #7  
Old 02-21-2022, 07:36 PM
stneki stneki is offline
 
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I did exactly the same. Works great.
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  #8  
Old 02-21-2022, 07:38 PM
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Quote:
Originally Posted by wirejock View Post
I plan to fabricate an anti rotation strip. Basically a strip of aluminum the thickness of the anti rotation tab. Holes for the switches and holes drilled for the tabs. Lives behind the panel. No need to drill tiny holes in the panel.
I think that is a great way to go and plan to do the same. To me, a panel looks so much better if the toggles are all aligned and vertical, versus canted a little to the left or right.
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  #9  
Old 02-21-2022, 08:08 PM
gasman gasman is offline
 
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I have never found a need for an anti rotation tab. But if you want one, an easy way to make a tab is to press a small tab at the desired location by using a punch with a small blunt end and a hammer. Use a file to square the sides. Practice this procedure on some scrap.
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  #10  
Old 02-21-2022, 09:46 PM
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When I lay out a panel in CAD I leave a little index tooth in the hole so when the laser cutter makes the holes it leaves that tooth for the anti-rotation groove. This is easy to do when using a laser cut panel. Can't be done with an NC router for obvious reasons. Here is a sample photo showing the indexing teeth. The big hole is for a magneto switch. The switch holes have the index tooth on the bottom of the hole and the circuit breakers holes have the index tooth on the top. You will also see a oval hole with straight sides for a Tyco (P&B) type circuit breaker switch.
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