Drilling a .12 hole 4.15 deep in 15-5 RC42

[neurosis]

Mitsubidhi and Sumitomo are my go to's when going beyond 30xD. When I need to go >50xD I gundrill.

CTS is a MUST.

I was going to respond more last night but I'd been up since 1am and was too tired to put a thought together.  lol.

I have an old high school friend who is a tool rep for Fullerton.  They're selling Inovatools drills and are going to bring one out for a test.  Supposedly they're pretty good?  I've never heard of them before. Not Fullerton, but Inovatools.

Their catalog has almost the exact method you posted earlier in the thread for entering and drilling the hole.  It's pretty detailed.

Our machines are getting a little long in the tooth and the only machines we have with CTS are 50 taper which isn't ideal for a 30XD .125 dia hole.      Only one of those isn't a geared spindle machine.  The geared spindle machines have much better coolant pumps but I worry that when we're exiting the hole; the instructions say to retract .1 incrementally, allow the CTS to clear the chips, reduce spindle speed, then feed out of the hole at a low feed; anyway, I'm concerned that the reduction in RPM will cause the machine to change gears which will cause the spindle to rock and potentially break the drill if any chips are bound in the flutes. I'd be less concerned by a gear change if it were a larger dia drill.

Our other option is an old Mori NVX 50 taper.  That's probably going to be where we have to run it. It's been around for a while so I'm going to have to do some investigating to make sure it's in good enough shape to do this. 

Here is the procedure from their catalog -



Guidelines for deep hole drilling
When it comes to deep hole drilling, there are certain procedures and factors that are particularly important for ensuring
reliable machining. The Deepmax is tailored to our 5xD 207 Series standard drills, which are the ideal pilot drills.
1. Pilot hole
Uneven surfaces must be faced or face milled prior to drilling the pilot hole.
We also recommend centering the workpiece.
Use a two flute drilling tool with a 140° point angle and an m7 tolerance range.
Should you be using a third-party product as your pilot drill, please make sure pilot drill diameter is M7 tolerance.
The pilot hole should ideally have a depth of 5xD or at least 1.5xD.
Centering and subsequent chamfering is absolutely essential for horizontal machining.
Any chips must be removed from the pilot hole prior to drilling the deep hole.
2. Deep hole
2.1. Entering the deep hole drill into the pilot hole
The internal coolant must be turned off for this procedure.
Set a maximum rotation speed of 500 rpm, preferably with anti-clockwise rotation, and a feed rate of around 10 ipm.
Enter the drill to .050"-.100" short of the bottom of the pilot hole.
2.2. Deep hole drilling
Please make sure you allow enough dwell time for the spindle to start and the internal coolant to build up pressure.
We recommend using our INOCUT cutting data without chip evacuation (pecking). It should not be necessary to retract the
drill for holes up to 30xD. Should additional chip removal be required, we recommend retracting the drill to 3xD.
When reaching intersecting holes or making through holes, reduce the feed rate by 50% prior to breakout.
2.3. Retracting the deep hole drill
After reaching the maximum depth, retract the deep hole drill by 050"-.100" (depending on the diameter) for chip removal.
If the coolant pressure is too low, you might need to program some dwell time.
Then reduce the rotation speed to a maximum of 500 rpm.
Retract the drill out of the hole at a programmed feed rate of around 40 ipm max (not in rapid traverse).

[neurosis]

Nikken SK series holders are awesome.
Nikken SK Collet Holders

So far we've looked at Schunk and Rego-fix.  I'll look at these on Monday.

[CNCAppsJames]

Schunk, Nikken, and Rego-Fix are my personal favorites.

[neurosis]

I was able to create perfect drilling cycle for this using advanced drill just as an fyi to anyone following.

[gcode]

Regox fix is the bomb, but in initial investment is high because you have to buy the press to assemble the tools.

[Newbeeee™]

Schunk, Nikken, and Rego-Fix are my personal favorites.

No Big Daishowa?

[Newbeeee™]

That's the exact process I have coded in my post for gundrilling ops

And I copied yours into mine 15 years ago....

[gcode]

No Big Daishowa?

I've been buying some Big Daishowa holders for our big Okumas
They are starting to get a nice inventory of HSK125 holders and the quality has been excellent.
They have an amazing selection of collet chucks.. so many that choosing the right one is bewildering
Here's a link to their online flip book

You have to setup an account to download models

[Newbeeee™]

I've been buying some Big Daishowa holders for our big Okumas
They are starting to get a nice inventory of HSK125 holders and the quality has been excellent.
They have an amazing selection of collet chucks.. so many that choosing the right one is bewildering
Here's a link to their online flip book

You have to setup an account to download models

I loved then on my BBT 30 machines

[CNCAppsJames]

No Big Daishowa?

Forgot about them.  

Must be getting old. 

[neurosis]

Must be getting old. 

Yea, we're all getting old.  Some times I have to worry that by Monday I'll forget something that happened on Friday.   

[CNCAppsJames]

My traveling 5-Axis tool kit is all Big Daishowa holders, and my workholding I switch off between Schunk and Mate depending on the machine I'm training on. 

[Newbeeee™]

Forgot about them.

Must be getting old.

Getting harder for me....over 7 years "properly" out the game now....🤪

[CNCAppsJames]

Getting harder for me....over 7 years "properly" out the game now....🤪

Been out of the full time programming gig for 17 years... and it shows when I do turn-keys.  

Man it feels like it takes me forever to program a part anymore. In reality it's probably between 30-50% longer.    

 

[Newbeeee™]

Been out of the full time programming gig for 17 years... and it shows when I do turn-keys.

Man it feels like it takes me forever to program a part anymore. In reality it's probably between 30-50% longer.   

I never was fast....never had the seat time that you boys had.
But I'd like to think methodical....
but yes, customer asked me last month to look at a problem set of parts they've been making for 18years across 3 identical machines and all of a sudden there's a few progs that are all different to eachother where when i left them it was only one prog for all machines....
and dang, that took a bit to fire up the old grey matter!