Drilling by depth

[Randy Morton @ Clem Industrial]

Good Tuesday all,

 

The way our engineered drawing come down to us with multiple hole sizes drilled along one axis causes a problem in that they typically specify a shoulder depth.

 

Is it possible to setup my drills to be from the flat where the drill angle ends instead of the drill point to make it easier to calculate the depths?

 

Thanks!

[Guest]

create points at the bottom of all your full diameters on all all your holes Randy and then use depth as incremental.

 

BTW, I am pretty sure your programmed depth, if your drill is defined correctly can then be achieved by using the depth calculator

[Steve Zirtzman]

This would not be my first choice, but you could always have the operator setup the drill off the "flat" instead of the tip.

[Jimmy Wakeford from Barefoot CNC]

If you define the tip angle correctly then you can use "tip comp" to put the shoulder on selected depth.

[88Matt]

randy,

What is your tol on the hole depths?

[Randy Morton @ Clem Industrial]

Typically it's .02", ocasionally it's +.06".

 

I don't think it would be good to have the guys setup off the flat, all I can see is the pending damage and drill parts all over the machine :S

 

Jimmy, I use the tip comp, but usually only on thru holes, not to acheive the flat of the drill instead of the tip. Lets say we were drill a hole that is .75" dia. and the drawing says 1.25" deep + .060" to the flat, how would you calculate the tip comp to put in?

 

John, I have never done it like this, use incremental to get the shoulder, and I don't really understand how that could work. Could you explain a little further?

[Guest]

Randy, the incremental is based on the "assumption", (bad perhaps) you have different depths and you would actually be programming the depths to the points. If your depths are all the same you can use ABS

[Mark V.]

How about the little calculator next to the depth parameter.You can add the tip to flat value in their.

[doyleg]

if you use the tip comp, you can put in '0' and it will automatically add the drill point to the hole bottom. you can even change the tip angle at this point. If you use mask on arc it will give you the depth of the dia. at bottom of hole. If it gives you the top select the bottom one for the depth or tell it where it should be and still use tip comp at '0'.

[Randy Morton @ Clem Industrial]

Since our engineers draw everything to bottom tol. and then add the +/- from there (I hate it that they do that...), it's easy enough for me I suppose to just use the calculator thiny and add what I need to hit mid tolerance.

 

Thanks for the thoughts!