Demon V8

Home Model Engine Machinist Forum

Help Support Home Model Engine Machinist Forum:

Joined
Dec 18, 2013
Messages
526
Reaction score
506
Location
Australia
Made two of the jig parts for joining the insulator to the base of the spark plug
one more piece to go

0DA864F1-2E50-4C85-B3D1-2E9152E5D66D.jpeg
 
Last edited:

Carbuilder

Well-Known Member
Joined
Feb 2, 2015
Messages
89
Reaction score
59
Location
Bolton, ON, Canada
I found that it was very easy to snag the finished electrode when threading the plug. The root diameter of the thread is pretty much the same as the OD of the electrode. I left that part round, threaded the plug, then finished machined the electrode end. Hope it works out OK with yours. Or maybe you've done it already and it wasn't an issue.

Cool fixture for bending the electrode!
 
Joined
Dec 18, 2013
Messages
526
Reaction score
506
Location
Australia
I found that it was very easy to snag the finished electrode when threading the plug. The root diameter of the thread is pretty much the same as the OD of the electrode. I left that part round, threaded the plug, then finished machined the electrode end. Hope it works out OK with yours. Or maybe you've done it already and it wasn't an issue.

Cool fixture for bending the electrode!
I did think of that and will leave them round until threaded
The plug in the photo is just a test one, I am waiting for 8-40 tap and die to arrive
 
Last edited:
Joined
Dec 18, 2013
Messages
526
Reaction score
506
Location
Australia
The 8-40 tap and Die finally arrived so I finished off the steel part of the plugs
Made a fixture to screw the plug base in to so that I could mill the tab, made life easier and didn't take long to do all the plugs
Once the Z height was set it was just a matter of screwing in the next plug and put it in the vice

IMG_1138.jpeg IMG_1137.jpeg IMG_1139.jpeg IMG_1140.jpeg IMG_1141.jpeg IMG_1144.jpeg IMG_1145.jpeg IMG_1147.jpeg IMG_1150.jpeg
 
Top