how-slow drilling cycle when breaking thru

[GeoGirl]

Hi Everyone,

 

I did a search first and could not find this topic, so, now I have to ask.

 

Is there a way to slow the feed when drilling before you break through? Do you have to do a seperate operation to finish the holes??

Or, is it not a concern when CNC drilling as opposed to manual drilling. (drill edges break maybe because it can suck it through)?

 

Thanks, any advice appreciated eh?

 

GeoGirl

[Thad]

I'd say it's less of a concern on CNC machines since it's a more rigid setup.

 

Welcome to the forum!

 

Thad

[Rick Henrickson The Boeing Co.]

Welcome, yeah what thad said

[PGW Steve]

Welcome to the forum GeoGirl, I'm in Winnipeg if you need any help. Like they said above, the controled feed of a CNC eliminates that from happening.

[Roger Peterson]

Use a sharp drill along with proper feeds and speeds and you shouldn't have an issue with most materials. However, with some materials it very desireable to have a "break through" feedrate that kicks in at a specific depth. This would be a custom drill cycle added to your post to output the code longhand. I don't know of a canned cycle that supports multiple feedrates based on depth on any machine.

 

 

HTH

[Rick Henrickson The Boeing Co.]

if its an okuma you can!

change of rough cut conditions

very sweet!

[Jack Neelands™]

one other issue i think you might want to address is whether or not the drill is in a drill chuck or morse taper...if you can avoid either of these and collet your drill then you wont have the problem with the drill slipping in the chuck when you break through or being pulled out of the morse taper...it doesnt happen often but when it does the circumstances can be devastating if your not near the machine when it happens

[Jack Neelands™]

oh yes ...sorry 'bout my manners...most ppl in here have been in here longer than me so i forget ...Welcome to the forum!!!!

[Lars Christensen]

I know if you are pushing the limit, they recommend that you slow down before break through, I have some Mits drills I am testing in the moment, right now I am running 1/8 coolant through, 10 X D with no peck at 15000 rpm at 60 ipm, no peck (material Aluminium)

They told me (Mits) that I might can run it at 150ipm, but then I have to slow down before break through. I was thinking just writting it as pure code, and then copy/paste the Z moves.

X0. Y0.

Z-1.15 F150.

N1

Z-1.25 F30.

[billystein]

Hi Guys,

I have had trouble with certain pourous materials. aluminum bronze comes to mind. when it breaks out of the bottom it likes to break the last little bit. I started drilling half way or almost through then from the other side.

[GeoGirl]

Hi all,

 

Thanks for the nice welcome, its greatly appreciated. I am sure I will have more questions in the future and thanks again for the advice.

 

Have a great weekend eh,

GeoGirl

[savagkd]

quote:

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JourneyWoman Machinist, CNC programmer, operator

---

Love it.

 

Welcome!

[Rick Henrickson The Boeing Co.]

savagkd Ogden area?

[babolino]

I want to know that too.

 

Anybody an Idea how to configure this in a post?

[Guest]

Double drill and then on the second drill slow the feedrate down.

 

Other than that I believe a custom macro is in order.

[babolino]

Will this be covered in X2?

 

Anybody knows something about X2?

 

I just don´t understand, because everybody often needs it (Boring on tubes an so...).

 

It´s like the holder definition thing, why can I just verify ONE kind of holder?

 

Ok maybe the collision can be checked know in HST, but when I verify, the definded holder is still not there.

 

Whats the Problem?

[Storkman]

Thanks for the info John.

[babolino]

yeah, thanks

[Storkman]

Sorry babolino, the beta testing program is sworn to secrecy. John was doing his sworn duty.

[babolino]

Oh, I understand ; )

[Guest]

storkman,

 

i don't think a day goes by without you making me laugh out loud at some of your posts.thanks for

the sarcism.

[babolino]

Another idea i´ve got.

 

How about to use the HIGHFEED function. So you can smooth speed up the feed an slow down before break through.

 

Can I use that on drill jobs?

[Storkman]

Glad to be of service del.

[cadman2112]

quote:

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It´s like the holder definition thing, why can I just verify ONE kind of holder?

---

I hope this is address in an upcoming release.

 

The industry is way past the one holder now.

[babolino]

bump!

 

It´s possible to use highfeed on a drill job?

 

How can I change highfeed parameters FAST like in V9? I know how to change ´em in the Mach Def.