Production drilling Inco-625. Drill suggestions?

Dylad · Aug 27, 2014

Hi guys. We have a mill job that requires us to drill a few thousand holes a year in the sides of some Inco-625 bar. I inherited the job and program, and right now I'm starting out with the same tooling that was used previously, but I am open to suggestions on anything that might last longer. The two hole sizes are 1/8" and 7/32", 0.200" and 0.300" deep respectively. Current program pecks with a cobalt center drill, then goes in with TiAlN cobalt stub drills. No through-coolant on the mill, unfortunately. Any thoughts to make this a bit less painful?

Thanks!

dstryr · Aug 27, 2014

Contact Guhring rep. Get someone over there to help you dial in the process.

Atomkinder · Aug 27, 2014

Never done any Inconel, but had a great experience with YG's carbide Dream Drills in hardened A2 (~60Rc).

plothoundsman · Aug 27, 2014

We machine a lot of Inco 718 , use nothing but carbide .

snydersux425 · Aug 29, 2014

Cobalt worked better for us in 625.

Larry Dickman · Aug 30, 2014

dstryr said:
Contact Guhring rep. Get someone over there to help you dial in the process.

For production drilling of Inconel, Guhring is the only way to go.

TeachMePlease · Aug 30, 2014

How bout a spot drill for spotting? One or two flute carbide (or even cobalt if you need the flexibility) spot drill should last longer than a center drill, and improve the longevity of your following drills, I would think.

Dylad · Sep 3, 2014

Thanks for all the suggestions- much appreciated. I'll update this when I come up with some actual tool life comparison #'s with a new process.

Dylad · Jul 31, 2017

Saw that I never updated this and thought I should, since I myself often run into the frustration of threads with no closure or concrete information/results.

We're still using cobalt drills for most of our applications. We invested in some carbide 142° spot drills and some high quality ER collets, and keep a very careful eye on our coolant concentration levels, and our tool life is what I consider to be excellent- hundreds of holes out of some drills.

DMF_TomB · Jul 31, 2017

Dylad said:
Hi guys. We have a mill job that requires us to drill a few thousand holes a year in the sides of some Inco-625 bar. I inherited the job and program, and right now I'm starting out with the same tooling that was used previously, but I am open to suggestions on anything that might last longer. The two hole sizes are 1/8" and 7/32", 0.200" and 0.300" deep respectively. Current program pecks with a cobalt center drill, then goes in with TiAlN cobalt stub drills. No through-coolant on the mill, unfortunately. Any thoughts to make this a bit less painful?

Thanks!

usually the shorter the length of a drill bit sticking out the better. literally often 200% faster drilling is often done with shorter tooling.
.
some drills like parabolic or certain carbide drills are made for less pecking if any needed. but it might take time for time savings to pay for extra tooling costs

deadlykitten · Jul 31, 2017

hy

what about machining at least 2 holes simultaneously ?

is there a patern ? kindly !

deadlykitten · Jul 31, 2017

1/8*0.2 > 3.18*5
7/32*0.3 > 5.55*7.62

what about direct machining with custom carbide tool ? thus without center drill ?

what about submerging the part under coolant, inside special tank ?

angelw · Jul 31, 2017

deadlykitten said:
1/8*0.2 > 3.18*5
7/32*0.3 > 5.55*7.62

WTF is the above supposed to mean? Neither are true statements.

litlerob1 · Jul 31, 2017

deadlykitten said:
hy what about machining at least 2 holes simultaneously ?

I think he would need 2 machines kindly

Or 2 spindles kindly

This and the above are good examples of what they call in psychiatric fraternities as "batshitcrazy", if ANYONE knows what the hell these posts mean, please be the translator!!

1/8*0.2 does not have inequality greater than 3.18*5
7/32*0.3 does not have inequality greater than 5.55*7.62

Seriously if anyone knows what this means I'm just curious.

Larry Dickman · Jul 31, 2017

You need to apply "Aland Logic" :nutter:

(Sorry, but there's no emoji of a guy jerking off)

litlerob1 · Jul 31, 2017

Larry Dickman said:
You need to apply "Aland Logic" (Sorry, but there's no emoji of a guy jerking off)

But there is this old one :dopeslap:

Just a little funny, so it doesn't apply.

As far as "Aland logic" Aland was one of St Paul's translators, and would use his own interpretations to do so. Now that is funny!!!!!

Johnny SolidWorks · Jul 31, 2017

deadlykitten said:

Of course, this is besides the fact that this post is 3 years old...

deadlykitten · Jul 31, 2017

hello all

i did not used ">" with the meaning of "greater than" ... it is an issue with my laptop keyboard, and using ">" instead of ":" works just fine for me

however, for a sharp reader, that should not be an impediment

it is an inch>mm conversion, and represents a note to my self

i saw that this thread is old, but if setup has future repetability, than a custom holder, with at least 2 rotary outputs may help

+ others suggestions posted

deadlykitten · Aug 1, 2017

deadlykitten said:
1/8*0.2 > 3.18*5
7/32*0.3 > 5.55*7.62

1/8*0.2 --> 3.18*5
7/32*0.3 --> 5.55*7.62

better now ? it is an arrow

angelw · Aug 1, 2017

deadlykitten said:
hello all

however, for a sharp reader, that should not be an impediment it is an inch>mm conversion, and represents a note to my self

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Smart reader be F***ked. Those with experience and knowledge simply disregard your Post. The concern is for the newbies that come to this Forum for help and read the Shite that you and Johnny Larue regurgitate and think it may be true.

So what would a Newbie take from your Post #12? The numbers have no relevance other than to yourself.

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