How To Sketch For Drill Then Boring Operation Help?

[Anonymous]

So I am having some difficulties trying to Sketch a drawing that utilizes a simple twist drill operation with a .25 drill then a boring operation to make the hole a final size of .29

Here is my question. OD of the part is .312 and is solid bar stock. I will face the stock, then Drill .25 and then would like to use a micro boring bar and make the final bore .29 the .25 operation is really only being used to open up the stock and give me room to get my micro boring bar inside (I need a minimum bore of .175)

So my question, when I sketch this part, I make my OD .156 then I create a revolve, which gives me a .312 diameter. Next I create a hole or sketch a circle. I make that .25 and the depth will be -.6  Next I want to come in with the boring bar and increase that .25 to .29 but this is where I am getting lost. If I draw a .29 Circle and choose a depth of -.6 then my .25 hole disappears. So should I just leave the hole .25 and when inside cam chose drill first and then choose Internal Profile and just work off the .25? 

Does that make sense? I would like to see the part modeled complete, but don't know how to properly sketch that and apply a tool path.

@HughesTooling, has been a great help for me on this forum, I am looking at the file you sent me and it helped me define my tool, but the MM to Inches is killing me 🙂

If you read this, I would be more then welcome to have you take a look at my drawing and maybe save my day AGAIIN!!

[Steinwerks]

Model your file as you want it when it's complete. You can use a smaller drill in the same hole and it will see that there is stock left, so you want to make sure you check the Rest Machining box in the Turning dialogue.

[Anonymous]

I was also doing some reading, This is a blind hole. It appears I am not the only person having issues with the boring simulation. I created a custom tool, and it keep retracting to X0. before it backs out of the hole. Obvioulsy that will snap my tool holder. I only want the boring bar to retract the bare minimum in the X value since I am working with such a tight tolerance. Apparently you cant do it with a blind hole, and in order to get the code right you have to make it a through hole to fake the program??? WTF

[Steinwerks]

I haven't played with it much, but you may be able to trick it by modeling a through-hole but using a plane to set a tool constraint.

[Anonymous]

@Anonymous Yes, that's the workaround, model a through hole. But that defeats the purpose of fully modeling a part. I spent 2.5hr messing with this, when I simply could CAM a 1/4 twist drill operation, then open up the editor and hand code 4 lines to bore to .29 So Frustrating I hate to complain at all since this is FREE and pretty awesome. It's just the simple things in LATHE that make me hate it 🙂

[Steinwerks]

Oh believe me, you're not alone! 😉

[jeff.walters]

I have reported this on ticket CAM-4015

[Anonymous]

Thank you!

[porsbym]

This has been fixed in the latest release. Please try it now.