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Make a 5-Speed Shift Knob the Old Fashioned Way

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Old 03-20-2017, 01:14 PM   #91
Jerry Feather
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That worked too. I beat on them a little bit with a mallet then clamped the shaft in my mill vise and pulled real hard and they both came apart. Then they clean up pretty good. There are a few very tiny bubbles in the surface in a couple of places, but they will never show with leather over them.
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Old 03-20-2017, 02:37 PM   #92
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The only way to get those air bubbles out is a vacuum chamber. You can build your own with a re-purposed paint pot and use your AC evac pump, or this place sells rigs for an affordable price:

https://www.bestvaluevacs.com/

The other option is using a thinner casting media, they will be easier to get the air to settle out. This urethane is pretty easy to work with. Its 1:1 (so no advanced measuring), has a pot life of around 10min, and pours very nicely. I still vacuum it when I can, but i have had very good results without:

http://www.reynoldsam.com/product/econ-80/

Regards
Hans
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Old 03-21-2017, 11:49 AM   #93
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Quote:
Originally Posted by hans14914 View Post
The only way to get those air bubbles out is a vacuum chamber. You can build your own with a re-purposed paint pot and use your AC evac pump, or this place sells rigs for an affordable price: Regards Hans
Thanks Hans. I was kind of wondering what Rob had in mind about "degassing." I guess I'll need to order a new vacuum pump for the vacuum sump I was developing for another of my latent projects. Then I'll find a used paint pot and work it into the equation. Great idea.

I also found that the Rubber Compound does not stick to the Syringe so it can be cleaned up for reuse. However I find that for some reason it does not want to push and pull very smoothly after the first couple of uses. A little oil off my nose helped some, but if that doesn't cure it I guess I'll still be using one of these only for one pair of *****.
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Old 03-21-2017, 11:57 AM   #94
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I just free-pour after degassing, but have seen people using the syringe method apply the same mold release stuff to the o-ring in the plunger.
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Old 03-21-2017, 12:41 PM   #95
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I just free-pour after degassing, but have seen people using the syringe method apply the same mold release stuff to the o-ring in the plunger.
Another good idea. Thanks, Hans.
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