cutting internal helical slots in a bush

[Anonymous]

Hello! Can anyone help? I am trying to set up the creation of a bush and need to mill/turn some internal slots. (see attached model) Currently the (lollipop) tool / toolholder traces along the path and fails by colliding with the stock. I think ideally what I want to happen is for the tool to come in at an angle and drop down to the first touch point. Inner/lower. I really want the tool to move in the y & z axis, NOT the x axis. I want the cutter to spin and I want the chuck to rotate in order to cut the internal spirals. Can someone please help me? Happy new year guys

[Anonymous]

You cannot use tool orientation as tool approach angle, it is used to index A or C axis, mill features on side of the part or to tilt  Z axis.

Your tool is crashing because shaft has no clearance when tool is at full depth in slot.

I used .0001 shaft diameter to get tool path then scaled it down to be in line with shaft of 3/4" slot mill.

In picture below, red is showing 3 mm tool and tool path at center of shaft.

Magenta is showing scaled tool path and 3/4" slot mill with tool path on its center and tool edge matching 3 mm tool in top view.

I couldn't offset drive curve from your modeled spiral so i scaled tool path instead.

The other way is to construct spiral at diameter required by slot mill and regenerate tool path directly off of it.

Judging from what I have done before, attached code should work but test in front of part before making chips.

Here is the link to tool i would use

http://www.harveytool.com/ToolTechInfo.aspx?ToolNumber=965459

[daniel_lyall]

Silly question but is this for a lathe with live tools or a mill and 4th axis?

[Anonymous]

[daniel_lyall]

I have seen it done with a mill doing mill turn.

[Anonymous]

Thank you for the reply, I will look in this. Happy new year

[Anonymous]

In my G-code file, you need to replace G and M codes with ones that your mill-turn is using.

In Haas world ....

G15 is main spindle selection

M154 - C axis on

M155 - C axis off

M133 - rotary tool on CW

M135 - rotary off

M15 - brake off

G112 / G113 same as G12.1 / G13.1 in Fanuc, polar mode on / off

I start nw year with Hyundai Wia HD2600Y, nightmare with indicating rotary tools on Haas is over with.

I will, however, suffer from PHTSD (Post Haas Traumatic Syndrome Disorder) for some time to come because I have to adopt programs to new controller as I run repeat work, ....... but new year should be happier then old despite that.