well john !!!
the truth is I am playing hooky , packing stuff up and dont currently know
the whereabouts of said item :(
i think it may be here at the house , rather it is packed already i do not
know , if it is here i will answer your question if it is already packed it
will be after the first when we get back to the show me state , in which
case i may put it in my vehicle and just go pay you a visit , if it is in
the shop at moms it will be a few days and i will get you that information
for now thats what i can do



jeremy youngs


On Mon, Jul 21, 2014 at 1:31 PM, John Thornton <bjt...@gmail.com> wrote:

> Jeremy,
>
> The photo is rather small, is the calculator small with tiny print? My
> eyes like big print.
>
> Just for S&G what does your calculator say for drilling a 1/2" hole in
> aluminum with a 135° split point?
>
> JT
>
> On 7/21/2014 12:18 PM, jeremy youngs wrote:
> > john this is the standby reference that i start with it is a really good
> > reference and the ONE that i trust most , well worth the 20 bucks.
> >
> http://www.ebay.com/itm/Machinists-Speed-Feed-Calculator-CNC-Mill-Tooling-/230704129486?pt=LH_DefaultDomain_0&hash=item35b709a5ce
> >
> >
> >
> > jeremy youngs
> >
> >
> > On Mon, Jul 21, 2014 at 12:13 PM, John Thornton <bjt...@gmail.com>
> wrote:
> >
> >> I'm writing a little Python program to give me RPM and IPM for twist
> >> drills. I have found some conflicting and some very old charts for feed
> >> per revolution like this one:
> >>
> >>
> >>
> http://www.free-ed.net/sweethaven/IndustrialTech/machinist01/pics/ch04.h1.gif
> >>
> >> I use mostly screw machine drills with 135° split point in my mill and
> >> lathe. Does anyone have a better chart or a formula for feed per rev?
> >>
> >> The little program is here:
> >>
> >> http://gnipsel.com/files/sfc/
> >>
> >> I still need to add an RPM limit and a zillion other things...
> >>
> >> JT
> >>
> >>
> >>
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