Re: cnc lathe programming question

ouremail@xxxxxxxxxxxxxxx wrote:
hiya,

Here is the question and a brief run down.

We do all programming with Mastercam and we also DO NOT use tool raduis
comp
on the machines so all start and end points are with the insert radius
in
mind.

The programmer was gone and i needed a simple program change. I was
trying
to figure the start points and end points for a simple radius into a
champher then linear move to another radius to a straight turn.

So a .01 radius on the begining and end of a .0625 champher.

An engineer once showed me the (magic) number for figuring this but i
have
lost my notes.

I know how to trig the real numbers, this wasnt the problem. If we used
nose
raduis comp it wouldnt be an issue but we dont.

So what i need is the formula that will figure the contact point of the
radius when a tool goes into motion.

To make it a bit more clear here is what i was trying to do.

champher started at Z zero and X of 8.110, radius of .01 to a 45 degree
champher, linear move to the raduis of .01 and ending at X 8.235 and Z-
.0625. With the real numbers programmed i was at about a .032 champher.
So i
need the formula for figuring where the tool actually contacts.

Now this is bugging the hell out of that i forgot and i want the answer
so i
came here. Sure we can use cad, sure we maybe or maybe not should
program
differnt. I WANT TO DO IT BY HAND.

thanks for the help
DM



Get some graph paper, a scale, protractor, and compass. Draw your problem scaled up. Draw your radii at .625 then accurately draw your problem with the scale protractor and compass. Use your scale and draw a line connecting the center of the radius to the intersection of the 45 degree line and the face. Next draw lines from the center of the radius to the intersection of the radius at the angle and the face. Measure the included angle those lines create. Divide that triangle in two and your problem will practically solve itself. Repeat the same procedure for the angle and the diameter. To do your problem start with just a 45 degree angle and compute those intersection points. You will use those to add to and subtract from to get your start and end points of your radii.
Good luck.
.

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