Tapping a Square Hole (Square to Your Material That Is!)
Intro: Tapping a Square Hole (Square to Your Material That Is!)
I have always been vexed by having to tap threads in a hole so that the threads are square to the top of the material I was tapping. I found a nice solution using a block with a groove in the side.
STEP 1: Insert Tap Into Hole
Start by putting the tap in the hole. Notice the tap I am using has a somewhat flat profile on it’s side.
STEP 2: Place Block So Tap Sits in Groove
Next, place the “jig” in place to align the tap. This jig is an old hydraulic valve with the right sized groove in the side of it. Start tapping the hole, while keeping the tap pressed against the inside edge of the groove.
STEP 3: Remove Block to Finish the Threads
After you have the threads established, you can slide the jig out the side to run the tap down further.
15 Comments
sharlston 14 years ago
Davad 14 years ago
Would it be possible to use a same size die to guide the tap bit into the hole?
ruzter 14 years ago
Davad 14 years ago
camperken 15 years ago
MisterSlippy 15 years ago
MisterSlippy 15 years ago
killerjackalope 15 years ago
ruzter 15 years ago
killerjackalope 15 years ago
ruzter 15 years ago
http://ruztercnc.wordpress.com/
;)
killerjackalope 15 years ago
doommeister 15 years ago
This looks like a solution, however you would need one for each size of f tap you use. So perhaps it would be worth making the spring loaded tube or even investing in something like this.
One tip I can offer is that if you use a drill press or miller to drip a hole that needs to be tapped then before you move the workpiece is place the tap in the drill chuck and start the tap by hand using the column to keep the tap square, this also works on lathes. Just be sure to knock the power off first (at the safety cut out preferably).
ruzter 15 years ago
rimar2000 15 years ago