[ATM] hogging out

[Mike Lockwood]

Frans,

Frans Franssen wrote:
> After having made several mirrors with blanks and tools of equal size I am
> now for the first time going to hog out a 13" mirror with a 10" plate glass
> tool. Which stroke should I apply to get the right depth? Should I move the
> tool COC with the center of the tool reaching the edge of the mirror with
> each forward and backward stroke? I will start with carbo # 60.  Thank you
> for your advice.

I'm guessing that if you can keep the 10" tool from rocking and moving 
around, a combination of the traditional chordal stroke (mirror on 
top, carefully) and some tool on top, center over center work with 1/3 
D strokes should do a decent job.

The plate glass tool is going to wear faster than the mirror (which I 
assume is Pyrex?), because it is softer and smaller, so you will have 
to determine when it is time to switch from chordal to TOT.

Keep the tool beveled!  It is going to wear faster, so the bevel will 
wear away faster, too.

When you do TOT, don't be afraid to stack some weight on the back of 
the tool.  Carbo likes pressure.

If you have a turntable there are faster ways.

	Mike Lockwood