1/8 Hole 2 3/4 deep 316SS

[GoetzInd]

Hey Dudes,

We have a part coming up that has 10 1/8 holes roughly 20D deep in 316 ss. Open tol. on the dia but we have a lot of parts to make. Machine has 400psi tsc which I think will be a limiting factor. Anyone have any recommendations on drills/set up

feeds and speeds?

 

Thanks,

Mike

[Guest CNC Apps Guy 1]

Titex Drill ALL THE WAY!!! Go to the low side of the feed/speed range with that low pressure. You shoudl be able to get a 20x D drill off the shelf. DON'T peck.

[Odin]

OSG and Mitsubishi have some great drills.

http://www.osgtool.com/1-8EXOCARB-GDXL 20D-p52701011.html

http://www.mitsubishicarbide.net/mmus/en/c...ogue/index.html

 

We have thru coolant pushin 600psi. drilled 4mm hole 11.5" deep. Backed the speeds and feed off 50% using the osg. also chip break .005" chip.

[Goldorak]

x2 for OSG drills

these drills last forever in S Steel

[Hardmill]

quote:

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Titex Drill ALL THE WAY!!! Go to the low side of the feed/speed range with that low pressure. You shoudl be able to get a 20x D drill off the shelf. DON'T peck.

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PEACE

[Zoober]

We do 20-30xD all day, every day. Our forte.

Titex is what we use.

I don't mean to be contrary, but we have found a G73 style peck works VERY well, even in 15-5. Specially on low PSI machines.

G83 will tend to chip the drill, but G73 works well.

[GoetzInd]

quote:

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Specially on low PSI machines.

G83 will tend to chip the drill, but G73 works well.

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Thats kind of what I was thinking. Maybe tool life won't be optimal but without high pressure im worried about chip evac. Are all you guys talking carbide for Titex? We've used a lot of their hss drills and they work awesome.

 

Mike

[Zoober]

Yes, Carbide. for aluminum we get over 1,000 holes.

SS, not quite as many.

[HEAVY METAL]

OSG all the way here

[Guest CNC Apps Guy 1]

quote:

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SS, not quite as many.

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LOL!!!!

[gcode]

I was talking to a Titex rep on the phone the other day

he said that rapiding in and out of the hole is what chips the drill.

He said if you have to rapid in and out to slow the rpm down to 100rpm or so before pulling out

or rapiding back in.

I've been drilling some 5/16 x 8" deep holes in 304 this way. The hole passes through a cross hole about an inch in and the cross hole was beating up the drill.

I drilled through the cross hole with a shorter

(and cheaper ) drill then switch to the long through coolant carbide drill.

I run the spindle at 100 rpm, feed through the cross hole and start drill.. with a full retract peck every 1"

Its kind of a pain to code but its works well.

[GoetzInd]

G,

Thats kind of what I was thinking. I dont think our 400 psi has a fighting chance to pop this hole in one shot.

 

Mike

[Mike S @ S4A]

check out Guhring firex series 575 too.... (deja vu....)