 Wheel Template for Rotary Spark Gap
|
|
|
profdc9
|
|
Thu Dec 14 2017, 09:57AM
|
|
|
Registered Member #58522
Joined: Tue Mar 15 2016, 08:33PM
Location:
Posts: 50
|
Hello,
I made this template for a wheel for a rotary spark gap based on an angle grinder. It helped make a good balanced wheel. The steps to manufacturing the disc I used were:
1. Print out the template and epoxy it to the piece of phenolic.
2. Cut out the outline of the wheel using a disc cutting tool
3. Drill a small pilot hole in the center, making sure to get the center as accurately as possible, and use a 13/16" spade bit to widen the hole
4. Turn a file inside the hole to widen it just enough to fit snugly on the 7/8" angle grinder flange
5. Place the wheel onto the angle grinder and carefully increase the speed (I used my variac for this, you can also use a router speed control unit). Use eye protection and stay out of the path of the wheel in case it breaks!
6. Using the file, carefully shave off the perimeter of the wheel to balance the wheel better and make it circular.
7. Once the wheel is well balanced, take it off the angle grinder.
8. Drill pilot holes for the 8 spark gap contacts. Widen the holes for the bolt you are going to use for the spark gap contact (I used 1/4-20 size). Make the fit snug.
9. Insert the bolt and put a nut on the other side, with lock washers between the bolt head and wheel and the nut and wheel. Otherwise the nut could shake itself loose. You can also use loctite, but the heat of the sparks might burn it up.
10. Use the disc cutting tool to trim the end of the bolt off to be flush with the nut face so that the nut acts as the second spark gap surface.
The template is attached to this message.
Dan
]wheel_template.pdf[/file]
|
|
Back to top
|
|
Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob
|
|
Powered by e107 Forum System
|
