#25 drill 4.25" deep

Started by Smit, January 19, 2021, 09:50 AM

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Smit

January 19, 2021, 09:50 AM Last Edit: December 31, 1969, 04:00 PM by Guest
This isn't a Mastercam question per se but a machining question to draw on the experience of uber experienced programmers. :)

I need to drill (4) .15 x 4.25" deep holes per part in 4140 steel. What do you guys think is the most efficient way to get that done? I know high speed will work and we only have one part right now but if it works there will be quite a big more in the future.

Thanks for your input!

neurosis

#1
January 19, 2021, 09:59 AM Last Edit: December 31, 1969, 04:00 PM by Guest
Almost 30XD in 4340?   :lol:  That sounds like a lot of fun.  

Do you have high pressure coolant through the spindle?
I'll go back to being a conservative, when conservatives go back to being conservative.

Smit

#2
January 19, 2021, 10:01 AM Last Edit: December 31, 1969, 04:00 PM by Guest
We do have high pressure coolant on some of our machines but not the one we're planning to use on the prototype. If it makes a huge difference I could probably talk the schedulers into moving it.

neurosis

#3
January 19, 2021, 10:27 AM Last Edit: December 31, 1969, 04:00 PM by Guest
We've done quite a bit of 20XD in Titanium.  Never in 4340 and never 30XD. I'd be more confident in stainless or ti.  :D  

We usually pilot the holes with a short drill, then step up to a longer drill to get to a decent depth, then run the long drill to depth.

We always use carbide with high pressure coolant. I've never tried it with HSS.
I'll go back to being a conservative, when conservatives go back to being conservative.

Matthew Hajicek

#4
January 19, 2021, 10:44 AM Last Edit: December 31, 1969, 04:00 PM by Guest
High pressure TSC and a quality carbide drill, with a stub pilot like Neuro said.  Sumitomo makes deep hole drills with a specially sized stub pilot drill that's I think a couple tenths smaller.

Hardmill

#5
January 19, 2021, 12:52 PM Last Edit: December 31, 1969, 04:00 PM by Guest
Dont know if they have the dia you need but take a look At Walter tools
https://www.walter-tools.com/en-gb/tools/standard_products/holemaking/overview/drilling/dc160/pages/default.aspx">https://www.walter-tools.com/en-gb/tool ... fault.aspx">https://www.walter-tools.com/en-gb/tools/standard_products/holemaking/overview/drilling/dc160/pages/default.aspx













PEACE :D

neurosis

#6
January 19, 2021, 01:21 PM Last Edit: December 31, 1969, 04:00 PM by Guest
I know that YG carries 30XD CBD drills with through coolant holes, but I've never tried them in 4340 so I'm a little apprehensive about recommending them.  

http://www.yg1usa.com/feature/itemdetail.asp?edpno=DHM30038">http://www.yg1usa.com/feature/itemdetai ... o=DHM30038">http://www.yg1usa.com/feature/itemdetail.asp?edpno=DHM30038
I'll go back to being a conservative, when conservatives go back to being conservative.

CNCAppsJames

#7
January 19, 2021, 02:45 PM Last Edit: December 31, 1969, 04:00 PM by Guest
CTS makes a MASSIVE difference. So much so that I would not even consider any other method for any reason. Prototype/one off or not. Sumitomo, Walter/Titex and Mitsubishi are my go to brands.

I've done up to 50xD. Anything past 15xD I create a pilot hole @ 1.5-2.0xD. Then I rotate tool backwards @50RPM into the hole to about .025" above the pilot hole depth. Stop the spindle, turn on high pressure coolant. start spindle @500RPM, ramp up to full RPM for drilling with a .5 sec dwell at each 1,000rpm increment until I reach full RPM, then feed it to depth. At the bottom of the hole I drop down to 500RPM and pull out. Once out. I stop everything.

That's what's worked for me.
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Smit

#8
January 19, 2021, 03:21 PM Last Edit: December 31, 1969, 04:00 PM by Guest
Alright, lots of good stuff here. I'll be calling on the tool reps tomorrow morning.

I appreciate you guys, thanks!

Shazam/TPP

#9
January 21, 2021, 05:17 AM Last Edit: December 31, 1969, 04:00 PM by Guest
keep us posted, will be interesting how this works out
:sofa:  :cheers:

crazy^millman

#10
January 23, 2021, 12:10 PM Last Edit: December 31, 1969, 04:00 PM by Guest
PCT Makes good drills also for this.

Shazam/TPP

#11
February 12, 2021, 09:45 AM Last Edit: December 31, 1969, 04:00 PM by Guest
wonder whatever happened to smit's drilling project??
:sofa:  :cheers:

Smit

#12
February 12, 2021, 10:05 AM Last Edit: December 31, 1969, 04:00 PM by Guest
I couldn't get machine time for a spindle coolant drill. We did it on an old Mori Seiki with high speed drills from Nachi.

It worked but it took a lot of time. I've got the data for Walter carbide drills if we go into production of them.

Dan_AKA_ROY23

#13
February 15, 2021, 01:23 PM Last Edit: December 31, 1969, 04:00 PM by Guest
I rarely drill. I will soon...

:HIJACK (sort of):

Need to go down 1" in SS 304 using a #17 drill (0.173" dia). There's a lot of holes, 349 to be exact.

Using a VMC mill..

Speeds and feeds? IDK. I have 1.3 ipm at 717 spindle speed (values G Wizard rec'ed) First spot drilling, then peck drill at -0.17" (thru hole).

Help...

:HIJACK OFF (well, similar subject so):

Shazam/TPP

#14
February 18, 2021, 09:00 AM Last Edit: December 31, 1969, 04:00 PM by Guest
Quote from: Dan_AKA_ROY23 post_id=6840 time=1613424207 user_id=82I rarely drill. I will soon...

:HIJACK (sort of):

Need to go down 1" in SS 304 using a #17 drill (0.173" dia). There's a lot of holes, 349 to be exact.

Using a VMC mill..

Speeds and feeds? IDK. I have 1.3 ipm at 717 spindle speed (values G Wizard rec'ed) First spot drilling, then peck drill at -0.17" (thru hole).

Help...

:HIJACK OFF (well, similar subject so):


call a tool rep, we use a 9/64 Mitsubishi drill don't know the speeds feeds off hand but works great for that size /depth
:sofa:  :cheers:
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