90 Degree Drill Attachment to 1/4 bit driver; Uses $4 metal bit chuck

Designed to be used with ½ chucks.

Drilling ½ inch hole into a 4 x 4.  

Gif is not sped up.  The framerate of the gif makes the drill-bit look like it is moving slower than it is.

For this print you will require the following parts.

• 4 - 17x26x5mm Bearings : https://a.co/d/f9FQgow (10 pack)
• ½ inch Square Drive to ¼ Hex Adapter : https://a.co/d/aKsEgdF (2 pack)
• 2 - M2 x 20mm bolts
• 2 - M2 brass thread inserts

For materials:

• Body: PLA+
• Gears: Nylon GF

General Assembly Instructions.

Do file down the surfaces for them to be smooth.  Focus on where the bearings ride.  You can put the shaft into your drill to help speed up the filing process.  Additionally, you can do the same with the pinion if you connect the two chucks with a bit.

Place 2 M2 brass thread inserts into the two holes with a soldering iron.

With a punch, hammer the 2 bearings into the top and bottom of the case.

For the Pinion, use a punch and hammer the bearing over the ½ drive seating if flush above the gear.  Place a second bearing in the back of the pinion.  Place the pinion back bearing first down on a hard surface and hammer the pinion down to seat the back bearing.

The drive shaft should easily slide from the top down the case through the two bearings.  You may want to tap the drive shaft down to get it to seat properly.  The pinion should be almost flush to the bearing.

Place the ¼ chuck adapter onto the ½ square drive.

The pinion should slide into place at a slight angle.  

The case cover goes around the chuck adapter, and holds the outer bearing on the pinion gear.  Bolt the case cover on with 2 M2x 20mm bolts.

📝Note: Reverse and Forward settings will be flipped when using this.

🚧Limitation: One limitation I have found so far is the wear of the quick attach on the square drive.  It does seem to wear out to a state less than I'd like..  I'd advise to keep the chuck adapter on once installed.  I'll try to redesign this, but don't have any ideas yet.  I'd like it to still be a quick detach design without any hardware or sacrifice of strength.