From: "Bill T." 
To: atm{at}shore.net
Cc: ea8yu{at}arrl.net
Reply-To: "Bill T." 



>I need to get some dental plaster from a local dentist to make the base
>of the pitch lap. The mirror is 10” - how much plaster should I ask for?

Here's a formula for estimating the amount of dry Hydrostone needed for a
given tool.  Dental plaster is probably similar.

weight_of _dry_Hydrostone = desired_tool_thickness * surface_area * 0.05

sufrace_area = radius * radius * 3.14.

Bill T.

_________________________________________________________________
Add photos to your messages with MSN 8. Get 2 months FREE*.
http://join.msn.com/?page=features/featuredemail

--- BBBS/NT v4.01 Flag-5