Linearmotionbearings2008 does not have an option coarser than 10mm pitch. I did learn that he can provide 32mm diameter screws. I did not ask the price. The nook calculator and adjusting the length closer to my need produces <175 inch per minute with the 32mm diameter screw. I am not sure if the Chinese ground balls crews would qualify for higher rotational speed than rolled screws? I don't remember who said it, but someone early on mentioned that wood likes speed. This does not seem fast compared to other peoples machines. Are there any other suppliers out there that can provide a complete package with blocks and end machining like Linearmotionbearings2008? The only other option I have found is Roton 1 X 1.000 Right Hand Recirculating Lead Screws & Nuts for Power Transmission - Roton Products, Inc.
Thanks for the link to Atlanta Drives. That integrated rail/rack is very elegant!