Teflon Spark Plug Boot Mold

[Draw-Tech]

HI all
Going through my files, came up with this.
Here is a design to make spark plug boots, the internal boot dimensions, can be changed to match your plugs.

Jack
Draw-Tech

View attachment Boot_Mold.zip

 

[dave-in-england]

So how do you inject the plastic into the mold ?

 

[Draw-Tech]

Hi Dave

Use the long point applicator, or with syringe. Regular red silicone. or two part mix. Regular may take a couple of days to cure. Inject till it flows from opposite end of mold.

Jack
Draw-Tech

 

[ShopShoe]

Please excuse me for asking, but have you done more with injection molding? In all the furor over 3-D printing, I had almost forgotten that there are other ways to make plastic (and related materials) parts. I might be able to use this technology. Do you have any links or sources where I can learn more about it?

Thank you for your help,

--ShopShoe

 

[GailInNM]

Thanks for the posting Jack. Looks good.
Thm:Thm:

Shopshoe: I wrote a tutorial on molding spark plug boots in a slightly different manner about 3 years ago. Near the end of the thread Ken posted some information about using polyurethane for a mold material. You might find that useful.
http://www.homemodelenginemachinist.com/showthread.php?t=14539
Gail in NM

 

[Draw-Tech]

Please excuse me for asking, but have you done more with injection molding? In all the furor over 3-D printing, I had almost forgotten that there are other ways to make plastic (and related materials) parts. I might be able to use this technology. Do you have any links or sources where I can learn more about it?

Thank you for your help,

--ShopShoe

Hi Shop Shoe
I had a mold made in 1977, cost $5,000 molds are expensive, unless you are going to produce by the thousands.

Jack
Draw-Tech

 

[aonemarine]

Why not use http://www.riogrande.com/Product/Ca...re-3-8-Mold-Rubber-Strips-5-lbs/701005?Pos=25

This stuff will expand slightly when heated and completely fill the mold if there are any air gaps. Seems easier to get good results...

 

[canadianhorsepower]

HI all
Going through my files, came up with this.
Here is a design to make spark plug boots, the internal boot dimensions, can be changed to match your plugs.

Jack
Draw-Tech

I can't open the file am I the only one ??

 

[Draw-Tech]

I can't open the file am I the only one ??

Try
New zip program, try downloading newest adobe reader.
I checked it seems to be OK

Jack
Draw-tech

 

[petertha]

Why not use http://www.riogrande.com/Product/Ca...3-8-Mold-Rubber-Strips-5-lbs/701005?Pos=25...

That's an interesting material, never seen it before. The (low-ish) 71 deg C vulcanization temp might be an issue on certain applications but maybe they make different temperature grades?

Some related possible boot molding materials discussion here starting post 285.
http://www.homemodelenginemachinist.com/showthread.php?t=21601&page=29

Question for Draw tech, I assume the Teflon reference is the mold block itself? How have you found machining that stuff & does it release off silicones & the like without release agents?

 

[stevehuckss396]

Thanks for the posting Jack. Looks good.
Thm:Thm:

Shopshoe: I wrote a tutorial on molding spark plug boots in a slightly different manner about 3 years ago.
Gail in NM

True! From that article came this idea. The mixture of putty is injected using a 1/4 inch dowel and a drill press or arbor press. Mold is held closed in a vise.

 

[aonemarine]

someone needs to send DReeves a spak plug boot. At the last CF show he said feel how nice and cool this engine runs, and without thinking I reached down and......well im sure you can guess what happened next. LOL

 

[gus]

Hi Dave

Use the long point applicator, or with syringe. Regular red silicone. or two part mix. Regular may take a couple of days to cure. Inject till it flows from opposite end of mold.

Jack
Draw-Tech

Hi Dave,

Thanks for the info. Been curious about molding silicone. The next boot will be DIY.