Help With Drilling Round Stock

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blake in spokane

Hot Rolled

Joined

Jan 11, 2008

Location

spokane

• May 13, 2010

• #1

Easy job & lots of them, 15/16 round clevis pins gets a 5/16 hole in one end. What would be a fast way to send the drill thru without center drilling first. The hole does have to centered & they aren't giving me much room for drifting over. Stub legnth drill, Dewalt pilot tip drill, or ? I haven't had much luck using drill bushings in the past.

 

Forrest Addy

Diamond

Joined

Dec 20, 2000

Location

Bremerton WA USA

• May 13, 2010

• #2

Drill a snug clearance hole for the pin in a piece of 3/4" plate.

Cross drill 5/16" to intersect on center.

Grip the edge of the plate in a vise while holding the plate in alignment with the drll in the drill chuck.

Slip the pin into the hole to a stop and drill. The plate will last for maybe 50 holes before the walls wear enough to affect centering.

Want to get fancy? Cross drill from another angle and tap for a flat point set screw.

Don't need no steenkng drill jig.

 

WizardOfBoz

Diamond

Joined

Sep 30, 2006

Location

SE PA, Philly

• May 14, 2010

• #3

Isn't this a case where split-point sharpening and 135° points will help you from wandering off?

Do the holes on each end have to be aligned? A precise distance apart?

Lay 30 of the pins down on a horizontal mill table, clamp them on top, and put a flat on all 30 pins in one operation to give you a flat to start your drill?

What problems have you had with drill bushings? I used to have to drill offset holes on rounds and a fitted drill bushing worked ok (my precision requirements may have been less than yours, though).

Jim

 

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blake in spokane

Hot Rolled

Joined

Jan 11, 2008

Location

spokane

• May 14, 2010

• #4

The hole is 1 end only but still has to align with other parts. My luck with drill bushings is the waded/jamed chips. I do like Forrest idea, slip'em in & drill

 

AIR-O-LATOR

Aluminum

Joined

Aug 27, 2007

Location

Kansas City Missouri

• May 14, 2010

• #5

I just use a piece of crs hex. Using a roll pin as a stop. Also I do use a drill bushing. With this setup a vise isn't needed.

 

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blake in spokane

Hot Rolled

Joined

Jan 11, 2008

Location

spokane

• May 14, 2010

• #6

I'm going to use a combination of all your guys sugestions.

 

LatheWerks

Cast Iron

Joined

Jun 15, 2008

Location

NJ

• May 17, 2010

• #7

blake in spokane said:

I'm going to use a combination of all your guys sugestions.

Click to expand...

post pictures when it's all done

 

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PaulT

Stainless

Joined

Mar 4, 2002

Location

Brisbane, CA, USA

• May 17, 2010

• #8

blake in spokane said:

My luck with drill bushings is the waded/jamed chips.

Click to expand...

When you used the drill bushings, did you leave some chip clearance under the end of the bushing?

They've worked well for me as long as I made the fixture with that clearance.

Paul T.

 

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Halcohead

Stainless

Joined

Apr 10, 2005

Location

Bay Area, Ca

• May 17, 2010

• #9

Allied Drill makes twist drills with thru-coolant and replaceable carbide inserts for the cutting edge. They don't need any center-drilling. And yes, they go down to 5/16", IIRC. Of course this might not be the right choice, depending on the machine you're using.

No affiliation, etc.