back cbores

[jlw™]

So for the most part back cbores are easy.  For small parts where you can use contour and create geo.  Quick and easy imo but not as easy as some other softwares I'm used to.

However, if you need to helical a really big one it gets arduous.  I have been creating a dummy plane 180 about X, create dummy helix bore path, xform geo, moving the geo and then running a 3d contour.

Now add in that I have to M19, offset, feed in, feed over, M03 it's getting painful.

What are your methods for back cbores that you have to helical mill?

[Guest]

MIll a helix, save geometry /////chain geometry

 

If I need a full cut around, I add a circle,,,,,,break the circle at the end of the helix, the while in chaining use the wait command, chain the helix then the circle

Edited May 9, 2017 by Guest

[jlw™]

That's exactly what I'm doing.

If I had the option to order cuts top to bottom in contour (ramp) or helix bore I'd be set.

[Grievous]

I use threadmill op, bottom to top. No need to create xtra geometry.

[jlw™]

How do you make it do a full circle at the top?

[GoetzInd]

Quote

How do you make it do a full circle at the top?

Maybe turn off helix lead in/out?

 

Mike

[Grievous]

I stay away from bottom of cbore/s when I use threadmill op, then copy the op and change it 2 circlemill and finish it.

[jlw™]

That's more work than creating geo imo.

[Grievous]

Well... it's your call.

For me it's easier and faster this way and less work. More control, one geometry shared by 2 toolpath. Plus what you will do when u want to change something ( ..like pitch etc...) and you have let's say 20 cbores....?

[jlw™]

I am going to try it.  The more I think about it the more I like it.

I still want bottom to top as an option in 2d contour.

[jlw™]

ROUR

Nevermind.  2018 has exactly what I want.  I just haven't been able to use the beta as much this go around.

Totally nevermind.

[jeff]

2 hours ago, jlw™ said:

ROUR

Nevermind.  2018 has exactly what I want.  I just haven't been able to use the beta as much this go around.

Totally nevermind.

Will this work? Looks pretty slick!

https://www.youtube.com/watch?v=g3B4RFl8Zwo

[jlw™]

I've used those before, the countersink ones.  Wicked fast.

No, not exactly.  I needed to machine a 250H8 back cbore thru a 155mm hole.  I had to use a home made fly cutter tool with a lathe tool flipped over, orient spindle to M19S2700, drop in, move to center and nibble up.  Had 4x about 10mm each on one part.  Took about 6 hours to nibble it in.