re: [ATM] machine hogging

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

Thanks for the thoughts. My tool is quite small in
diameter, maybe 5 inches. It is ring-shaped, not a
solid bottom. I will try additional weight, and I will
also try a different tool, a ceramic one. But it looks
like doing it all by hand might be much faster ....
Guy

--- Chris Plicht <cap@plicht.de> wrote:
> Hello Guy.
> 
> What diameter is the tool? When I tried to hog with
> a barbell weight my progress was comparably slow,
> almost nil. Then I poured a tile tool of about 65%
> mirror diameter and let it run close to, but not
> crossing the mirror edge. This helped a bit and
> hogging started. I had then to rebuild the tile tool
> as the first layer wore out. I guess that a smaller
> tool, close to 50% mirror diameter, would work
> better, i.e. faster.
> 
> As Dave mentioned a pre-generated iron tool may work
> better. From what I read those tools make sense when
> you plan to make several mirrors with the same
> diameter and Rc since the iron tool doesn't change
> Rc too much, if any. 
> 
> Is the tool flat or ring shaped? A flat iron tool
> will not hog, it must be ring shaped with the ring
> being not too wide. As said above, my experience
> with tile tool is much more promising.
> 
> I used up to 25 pounds of weight when hogging, 5
> pounds might be not enough. Here I would like to
> have even more weight but have yet to go out and buy
> more BB weights. Put load on the tool.
> 
> Happy grinding,
> Chris
> 
> 
> 


=====
Guy  BrandenburgWashington, DChttp://home.earthlink.net/~gfbranden/GFB_Home_Page.html

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