Replies

1. 
   user-148830 | May 01, 2007 06:28pm | #1

   Nonquit,
   You must drill from the top of your ball, as it sits on a drill press table, straight down and through the center. So, #1 your drill press table must be set at a right angle to your bit. Check this angle
   first.

   Next your ball must be placed so its center lines up with the bit’s center each and every time. I would make up a holding/ centering jig.

   The bottom plate of this jig would be a piece of 3/4" plywood about 5 x 10". Cut a wide groove, say 1-2" wide, in this plate about 1/4" deep. At a convenient spot near one end of this groove and centered in it, drill a locating hole about 1/4" deep. This hole will line up your bit each time you use the jig. Clamp the base in place onto the drill press table when the locating hole and the bit line up.

   Inside the groove cut will sit two v-cut blocks, large enough that you can clamp them tight around the ball. Have them cut so that they slide snug inside this groove.

   Set up the jig under the bit, but the ball over the locating hole, [your hole should be wide enough that the ball will just line up in it] move the clamping blocks around the ball and lock them down onto
   the ball and onto the jig. Then make your hole cut. I believe this will solve your accuracy problems. Good luck.

1. 
   Nonquit | May 02, 2007 12:06am | #2

   Thank you, I will proceed accordingly.Regards,Nonquit

2. 
   woodshopteacher123 | May 09, 2007 09:05pm | #3

   Why not mount a 3/4 inch base on the drill press table chuck a 3/4 inch forstner bit drill down into the 3/4 inch baseplate about 5/8ths of an inch forming a rim for the ball to sit on then the ball would be aligned on center.

   
   

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   Edited 5/9/2007 2:06 pm ET by woodshopteacher123

1. 
   Nonquit | May 09, 2007 10:32pm | #4

   Thank you for your suggestion. Sounds good, I will try it.Nonquit