1/2" od, 1/4" dp 90 deg apart holes

[myshop1044]

I have a 6" circle, I want to put 4 -1/2 holes 1/4" dp with a rounded bottom.
Can you use a 1/2" bull nose bit? and how do you make it plundge down in 1 position
then move to the next position. getting back to basics.

Perry B.

[mtylerfl]

I have a 6" circle, I want to put 4 -1/2 holes 1/4" dp with a rounded bottom.
Can you use a 1/2" bull nose bit? and how do you make it plundge down in 1 position
then move to the next position. getting back to basics.

Perry B.

One way to do that is:

Draw four tiny circles...manually assign the 1/2" BN. Example MPC attached...

[myshop1044]

Michael, your mpc was great. at first I couldn't understand how you did it but after a while
I understood the logic. I couldn't move the circles until I zoomed in very very close to
get the move arrows, then it worked.
Now I get the logic and was able to reproduce the circles myself.
I'm going to try a test carve tomorrow.
Thanks again.

Perry B.

[myshop1044]

Here is the results of the 1/2" hole test, this worked great, this is a great little trick to know.
Sine there is no plunge command to get the bit to go down and return up again, MT's tip work great.
Perry B.

[bergerud]

Did you set the max depth or just let the machine do its own thing?

[myshop1044]

I set the depth to 1/4".

[Dan-Woodman]

Setting the depth is your plunge command. I don't know why you would need to draw a circle, just use a straight line command , click and click again ,let off without moving, set your required bit , depth and go. Another way would be use the drill function, substitute the 1/2" bit for the 1/8" bit , use 1/8" hole diameter, 1/4" depth , but this may be a little too fast feed.

[myshop1044]

Thank you Dan, now we have 2 ways to complete the same function, 1 straight line of .016 length
and a circle with a dia. of .016 also using a 1/2" bull nose bit.
This is what so good about this forum.

Perry B.