cutting angle chart

**prasannakumarpr** · 10-02-2011, 11:42 PM

I am looking for conversion chart from degree to diopter to work with manual generator where cross curve is given in degrees instead of diopter.

**shanbaum** · 10-03-2011, 06:46 AM

Ah, so you have a Loh MT-2? You may have a hard time finding what you need, unless you can find an old copy of RxCalc, which had those calculations built in. I think we excluded that when we first developed Innovations, because the machine was already obsolete at that time (almost 15 years ago).

**lensgrinder** · 10-03-2011, 01:08 PM

If you are generating a concave surface.

$sin \alpha = \frac{d}{2(r - e)}$
or
$r = \frac{d}{2(sin\alpha)} + e$

where
$\alpha \ is \ the \ anlge \\ r \ is \ the \ radius \ of \ the \ surface \\ d \ is \ the \ diameter \ of \ the \ tool \\ r \ is \ the \ radius \ of \ the \ surface \\ e \ is \ the \ radius \ of \ the \ tool \ edge \\ $

You could make up an excel spread sheet with this formula to make your own chart.

**Rafael** · 10-06-2011, 01:50 PM

http://www.optiboard.com/forums/show...ghlight=rafael

**prasannakumarpr** · 10-07-2011, 12:19 AM

thank you very much ,formula with diagram helped me in solving the mystery.
Now i will work on old generator and post the results

**bhess25** · 10-07-2011, 07:34 AM

if you dont have a ton of cash to work with, why not just find an old coburn 108 and call it a day! those things are work horses and built to last!!

**Don Gilman** · 10-07-2011, 03:40 PM

Originally Posted by bhess25

if you dont have a ton of cash to work with, why not just find an old coburn 108 and call it a day! those things are work horses and built to last!!

I have a 108 that my father purchased in about 1955 still in daily use and cuts in excess of 500 lenses per day.....all spot on! Think my warranty is still good?

**bhess25** · 10-10-2011, 10:19 PM

Originally Posted by Don Gilman

I have a 108 that my father purchased in about 1955 still in daily use and cuts in excess of 500 lenses per day.....all spot on! Think my warranty is still good?

i learned on a 108...i love those generators...call them what you want but those things are work horses and built like tanks!!