any tricks/tips to....
- Thread starter boombag13
- Start date
OK.
The ejector leg needs a notch for the retaining pin. The ejector was put in place, then an attempt was made to try to drill half a hole in the ejector leg. Small drill bit ran sideways and snapped. No doubt flush or even below the surface.
Here is what I would do...
I would hold the ejector in the vise, and see if I could remove it by tapping the frame away from the ejector. Tap with a hammer and non-marring punch. Broken drill might chip, releasing the ejector.
Cut away the ejector. Cheap, easily replaceable part. File the remains of the ejector leg flat. Center punch and drill a pilot hole. Enlarge the hole step by step until the broken bit becomes a problem. Go to work with a small burr and Dremel. Gnaw away enough of the ejector leg until the remains of the broken drill and ejector leg can be picked out.
Get another ejector and pin. Mark the ejector leg for the location of the pin. You can use a drill in the hole, but just mark it, don't try to drill it. Remove the ejector, file a notch for the pin.
The ejector leg needs a notch for the retaining pin. The ejector was put in place, then an attempt was made to try to drill half a hole in the ejector leg. Small drill bit ran sideways and snapped. No doubt flush or even below the surface.
Here is what I would do...
I would hold the ejector in the vise, and see if I could remove it by tapping the frame away from the ejector. Tap with a hammer and non-marring punch. Broken drill might chip, releasing the ejector.
Cut away the ejector. Cheap, easily replaceable part. File the remains of the ejector leg flat. Center punch and drill a pilot hole. Enlarge the hole step by step until the broken bit becomes a problem. Go to work with a small burr and Dremel. Gnaw away enough of the ejector leg until the remains of the broken drill and ejector leg can be picked out.
Get another ejector and pin. Mark the ejector leg for the location of the pin. You can use a drill in the hole, but just mark it, don't try to drill it. Remove the ejector, file a notch for the pin.
- Location
- Blaster land, Okanagan BC
Blind or through hole, I've always resorted to chipping or grinding out broken bits. Sometimes you can take a small centre punch or awl and tap on the drill bit in its reverse direction and it will start to reverse itself enough that you can use a dental pick to work it out.
Yeah, did jobs like this for a living for a while, got pretty good at it.
Scriber, dental pick dental burrs and an air drill, carbide mill cutters and a milling machine, etc. Be very aware that breaking off carbide anything in the same hole as the already broken item, is going to make your life really miserable... Have a plan for what you are going to do if it all goes haywire!
Never had an EDM to use, so never went there. A friend of mine built a simple EDM burner out of a 12v battery charger, some copper house wire, and some pieces of plastic pipe, which worked pretty darn well, considering. Essentially a solenoid that used the electrode to make the current path, which then retracted the solenoid, breaking that path, causing a spark. Gravity drops the electrode down again, the process repeats, makes a hole, eventually.
Best of luck, stay patient, and be persistent. The drill would have broken because it wedged on something, often you can poke and prod at it until it un-wedges. Otherwise you will have to look at more violent methods.
