Author Topic: Plugs  (Read 3137 times)

Offline Doc

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Plugs
« on: February 02, 2014, 01:58:53 AM »
Well this afternoon I started thinking about the small spark plugs I need to get made so made my first attempt at one this small here is a shot of the insulator. only 15 more to do.
By then I should be able to make the look a little better (I hope).

Offline stevehuckss396

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Re: Plugs
« Reply #1 on: February 02, 2014, 02:28:42 AM »
How small are they?  What size thread?
Do not be like the cat who wanted a fish but was afraid to get his paws wet.

Offline Doc

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Re: Plugs
« Reply #2 on: February 02, 2014, 03:08:40 AM »
These will be for the Little Demon I'm working on. I haven't spent any time on it in some time. I finished an engraving job this afternoon so spent a little time on it. I will try the steel body and swagging tool tomorrow. When you made your swagging (form) tool did you heat treat the die section? Just curious. I have a long way to go on this build the crank material is laying here just waiting for me to give that a try.

Offline stevehuckss396

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Re: Plugs
« Reply #3 on: February 02, 2014, 03:24:21 AM »
These will be for the Little Demon I'm working on. I haven't spent any time on it in some time. I finished an engraving job this afternoon so spent a little time on it. I will try the steel body and swagging tool tomorrow. When you made your swagging (form) tool did you heat treat the die section? Just curious. I have a long way to go on this build the crank material is laying here just waiting for me to give that a try.

No heat treat. With the 12L14 body the lip rolls over pretty easy.




If these are for the Demon I can send out some insulators made of corian. All you would have to do is drill the thru hole for the electrode. PM me your address if interested.

Do not be like the cat who wanted a fish but was afraid to get his paws wet.

Offline Doc

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Re: Plugs
« Reply #4 on: February 02, 2014, 03:43:49 AM »
Thanks for the offer Steve and I'll probably kick myself later but I would like to do them myself.
Thanks for the kind offer!

That is one pretty plug there I just love that picture!
 

Offline stevehuckss396

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Re: Plugs
« Reply #5 on: February 02, 2014, 01:03:34 PM »
Thanks for the offer Steve and I'll probably kick myself later but I would like to do them myself.
Thanks for the kind offer!

That is one pretty plug there I just love that picture!


Not a problem Doc!

Do not be like the cat who wanted a fish but was afraid to get his paws wet.

Offline Don1966

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Re: Plugs
« Reply #6 on: February 02, 2014, 05:35:57 PM »
Steve I have a question about your plug. Do you roll the lip on the lathe are do you use a tool like a riveting flaring tool. In other words like a cone head tool?

Don

Offline Mosey

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Re: Plugs
« Reply #7 on: February 02, 2014, 06:17:09 PM »
Steve,
Very nice plugs! How do they compare to the Rimfire?
Mosey   :zap:

Offline Doc

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Re: Plugs
« Reply #8 on: February 02, 2014, 08:17:48 PM »
Ok here is my first attempt still need to make swagging tool.





I know it isn't real pretty but I hope they will get better as I refine the process but it does work.
<a href="http://www.youtube.com/watch?v=eW_WvC7786Y" target="_blank">http://www.youtube.com/watch?v=eW_WvC7786Y</a>

Offline stevehuckss396

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Re: Plugs
« Reply #9 on: February 02, 2014, 08:34:36 PM »
Steve I have a question about your plug. Do you roll the lip on the lathe are do you use a tool like a riveting flaring tool. In other words like a cone head tool?

Don


I have a press that rolls the lip over.

The base of the plug threads into the bottom piece.

The center part is bored to .005 larger than the bottom and top piece. It's
sole purpose is to hold the top and bottom parts in alignment.

The top part is the piece that folds the base over the insulator.

The center part is slid into the arbor press. The base is screwed into the bottom
part, the insulator gets set into the base, and the whole mess is dropped into the
center part. Then the top part gets dropped into the center part and on top of the
bottom part with the base in it. Then lightly press. The 12L14 is no match for the
steel press and folds real easy.



Do not be like the cat who wanted a fish but was afraid to get his paws wet.

Offline Don1966

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Re: Plugs
« Reply #10 on: February 02, 2014, 08:59:12 PM »
Thanks a lot Steve it's very clear.

Don

Offline Doc

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Re: Plugs
« Reply #11 on: February 03, 2014, 12:49:12 AM »
Ok I turned up a swagging tool and swagged the first plug. In stead of a counter sink in the die section I used a 1/4 dia ball nose end mill and put a radius in to form a radius on plug. It worked out pretty good now to refine the insulator on the next go.