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Bowling ball switchable thumb

by vil_le Dec 14, 2016
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Would love if you could make a vice grips version of their IC? Also googling this I saw a post that I think you made discussing this in 2015. Good for you for making it.

There is really no need for drilling. You can make any kind of hole already to the slug. Leave it unsanded and you will have sort of a rough surface to grip. Sand it down an it becomes very sleek. Well, with petg at least. Drilling the plastic could easily ruin the whole part.

I added example picture of the slug I just made. Since it is for testing purposes only, I also added text to the side to show the pitch and on the top of the slug there is a scale that shows the oval angle. It has a thumbhole pitched .150" forward with oval angle of 45* :)

Remember that in order for the slug to be legal to use in bowling balls, it has to have a hole all the way to the bottom of the slug. It is not allowed for bowling ball to have a not solid area inside of the ball. That is why all the switchgrip slugs are drilled as deep that there is a hole through the bottom.

I can also help to customize slugs if needed. I use Solidworks for modelling. Send me a PM if there is any problems.

Thanks! It's the first thing I plan to make. If you put at least a 3/4 or 5/8 hole, that would save material. Then it is still drilled and sanded.
I plan on dropping 7/8 hole pitched 1/4 forward then drill to my size 31/32.
Maybe even attempt to profile the tip within .030" and hand sand or low speed Dremel.
Thanks a TON for modeling this! I only have PLA, hope it's strong enough.
Any chance you could model finger grips for flexible? Or my idea was to mill out 31/32 (or 1") wide by 1.5 or 2 tall and print offset grips versus plugging old balls for span.