Covington Sphere Cutting Tool Kit

sphereproducts.com/slabgrabber-sphereindexing.htm

Here is an sphere preform indexer. It doesn't look too hard to make a home made one. Might be a good project.

Here's a link to his short videos on sphere preforming. www.sphereproducts.com/spheremaking-dvd.htm
The list of videos is on the left.

Thanks for the links,
Some good videos on using the preform tool.

Harold

Just make your own or look for a simpler jig then that one. Here is mine, works great.

Tim

I would think that the cube would have to be larger than the "wing" that points to the left in the photo. And a bit longer than the length of the jig. I've been building one in my mind for the last few weeks and then this pic shows up.

I do. I find that to be quite excessive.
I talked to him and he says that paypal made it that way.
I am naturally suspicious of people I have no experience with. I guess it comes with the job I do.

Justin, visualize clamping that jig onto a tile saw table. It's positioned so the cuts are made in the correct place. Soon, you will understand where that is.

Now put the cube - corner down - into the angle. Now the cube is sitting at a 45 degree angle like a diamond. Flat face of the cube is facing the blade and the back of the saw table. Hold cube in place by hand and feed across the saw blade. Carefully trim, rotate 90 degrees, trim again, keep rotating and cutting until all the corners are clipped into a preform.

In tha case of Tim's image the point of view is from near where the saw blade would be. Saw blade would be slightly right of the camera in this image.

I have seen the same from two pieces of angle iron welded in a sort of 96 position so when placed on the table the same orientation is achieved.

I watched the videos. I like how the sphere indexer does not require starting from a cube. Instead it starts from to parallel faces. The finished preforms are very uniform, this makes for faster hand grinds.

Now to figure out how to clamp it on a vertical vice.