Making Hard Sector Floppies

Hi I'm starting to make some mechanical drawing for some 11 hole punch blocks that could be used for any combination of auto or manual punching. There is an ANSI spec, X3.163, that I'd like to look at. The cheapest I've seen is $22 and I don't want to put out that much for a few simple dimensions. The one I have the most question on is envelope thickness. For the 5.25 disk I've already figured most of the rest ( or at least what I believe them to be). This is what I have so far: Spindle hole 1.125 dia index hole 0.10 dia index relative to center of disk 1.00 radius Spindle relief hole 1.5 dia Thickness of complete disk ( not counting folds at edges ) about .070 I'm hoping that there may be enough interest in these to make 10 or 20 units. This would make the machining cost reasonable. Dwight _________________________________________________________________ The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=…