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Re: [ATM] More Grind

Hi David,

You've probably already mentioned this.  But, what type of material is
your 14.5 inch blank?

-Anthony
Round Rock, TX

> -----Original Message-----
> From: atm-bounces@atmlist.net 
> [mailto:atm-bounces@atmlist.net] On Behalf Of vorblesnak@peak.org
> Sent: Thursday, June 14, 2007 9:53 PM
> To: atm@atmlist.net
> Subject: [ATM] More Grind
> 
> Had a rough day at the office and came home with enough 
> attitude to get another 3/64ths of hogging in.  Sagitta 
> stands at 7 to 8 64ths.  By our old friend r^2 over 2R, 
> seeking an f7 curve on this 14.5 inch blank I get
> 93 inches of focal length at 9/64ths and 105 inches at 
> 8/64ths.  So I have about 1/64th left to hog.  The ground 
> surface is about 3/8ths of an inch away from the edge of the 
> disk.  I am thinking I will switch to 120 grit to get that 
> last bit of depth and move the grind out to the edge.  By 
> then I should have a nice smooth graceful curve to finish out.
> 
> Looking at my notes, including the romp into grit creation, I 
> have about 7 hours into the job.  Doing pretty well.
> 
> 14.5 inch diameter
> 1/2 inch thick
> f7 target
> 
> David Davis
> Toledo, OR 97391
> 
> 
> 
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