need drill recommendation

[Bob W.]

I need to drill some holes in aluminum that are 1/2" diameter and 7" deep. I would like to do it in one shot without pecking and I have 300psi through spindle coolant. I will also be drilling this part from both ends and I need a fairly good match (within .005 from centerline). This is a repeat job but the volume is low (60-80 pcs/year) so I can't justify an extremely expensive drill. Any recommendations on a drill that would accomplish this?

 

Thanks,

Bob

[Slixmix]

George Whalley drills for deep holes. Whalley drills

[Brando]

imo , youll need a pilot drill to maximize the tool life and to keep the drill on center, dormer makes hss drills with tsc holes , osg also makes a deephole drill without coolant holes called the helios this may be cheaper, but ive never used one so..... titex also makes good deep hole drills (xd-16 series), guhring, series 6509 will also be a good choice

[mill programmer]

I use YG1 alot because of the price. Performs very well, comparable to Guhring, but cheaper.

[andate caga]

ACME spade drill.

[Jayson Kramer]

So you are actually only going 3.5 because of drilling from both sides or each side is 7"? I would use a Titex or Mitsubishi coolant thru carbide .

[Zoober]

I would go with a 4 margin drill to assure alignment.

Jay mentioned a couple that I would recommend.

That's about all I can say about holes without getting in deep sh!t. But we do a few holes here (intersecting, 30xD+) and have it down to an exact science.

[Hitachi]

A cheap chinese drill ought to do the trick, you get what you pay for lol

[YoDoug®]

Mitsubishi for my likes. Here is a test we did for a customer. We had to slow it down a little from the video (80 IPM vs 110IPM) to hold .005 hole position.

 

[Bob W.]

So you are actually only going 3.5 because of drilling from both sides or each side is 7"? I would use a Titex or Mitsubishi coolant thru carbide .

 

No, I will be drilling in 7" from each end.

[Joe788]

Mitsubishi for my likes. Here is a test we did for a customer. We had to slow it down a little from the video (80 IPM vs 110IPM) to hold .005 hole position.

 

 

Doug, did you have to follow a bunch of special deep hole procedures for that drill? Or are you slamming it in there with a G81?

[YoDoug®]

Doug, did you have to follow a bunch of special deep hole procedures for that drill? Or are you slamming it in there with a G81?

 

Joe, the process is as follows.

 

1. drill/end mill a pilot .001-.002 smaller than drill size about .25 deep.

2. enter hole with drill at 150 rpm and 20 ipm.

3. increase rpm to drill rpm

4. drill through 110 ipm

5. rpm to 150

6. rapid retract.

 

 

[Joe788]

Cool Doug. Thanks for the info.

[Bob W.]

Does a custom drill cycle need to be created for one of these? If so, how does one go about setting one up?

[TK-32™]

Bump for interest