- Joined
- Aug 15, 2013
- Messages
- 2,118
benster,
Unless someone who knows what they're doing told me different, this is how I would do it. Clamp the piece of pipe to your mill table. Find center of the pipe cross section and set both X and Y DROs to zero. Then, with something in the spindle to act as a pointer, mark the slot locations as follows:
Slot #1 at X= +4”, Y= 0
Slot #2 at X= -2”, Y= +3.46”
Slot #3 at X= -2”, Y= -3.46”
Then reposition the ring on the table as needed to cut each slot radially.
Here is the bolt circle calculator that I used to find those coordinates. You can tweak it for the actual OD of your pipe if 8" is just the nominal size. Hope this helps.
http://littlemachineshop.com/mobile/bolt_circle.php
Tom
Unless someone who knows what they're doing told me different, this is how I would do it. Clamp the piece of pipe to your mill table. Find center of the pipe cross section and set both X and Y DROs to zero. Then, with something in the spindle to act as a pointer, mark the slot locations as follows:
Slot #1 at X= +4”, Y= 0
Slot #2 at X= -2”, Y= +3.46”
Slot #3 at X= -2”, Y= -3.46”
Then reposition the ring on the table as needed to cut each slot radially.
Here is the bolt circle calculator that I used to find those coordinates. You can tweak it for the actual OD of your pipe if 8" is just the nominal size. Hope this helps.
http://littlemachineshop.com/mobile/bolt_circle.php
Tom