Answers to some common questions on precise drilling in metal work pieces
—Sponsored article by Fein Canadian Power Tool Company
In industries such as steel construction, shipbuilding or in foundries, core drilling systems provide a powerful solution for drilling precise holes in metal work pieces. For optimal performance, check out answers to some common questions from core drill power tool users:
What problems can be experienced with core drilling?
High temperatures near welded seams or separating cuts made by cutting torches may result in structural changes, which can cause the core bit to wear very quickly. In the case of overlapping holes, the core bit may catch at the transition between the existing hole and the new one, causing the core bit to jam or even break.
How should the tool be set up?
The surface being worked on must be clean and free of rust, scale or paint; and the entire magnetic foot must sit on the material to be drilled. The material must be at least 12 mm thick and magnetisable. These requirements ensure proper magnetic holding force. If the surface isn’t cleaned, or the material is less than 12 mm thick or not magetisable, the result could be the machine moving on the material causing cutter breakage.
What action should I take if the core bit gets stuck?
If the core bit gets stuck, switch off the motor. Inspect and carefully take the appropriate action to remove the cutter.
What do I need to change if core bits are breaking?
Check whether the core bits are still sharp. The guides must be set to have no play on the machine. If this isn’t the case, please send your tool to customer service. Reduce the feed force and change the speed if possible.
What should I note when drilling?
Position the drill with care and drill through in one go wherever possible. Don’t switch the tool off during drilling, as doing so could cause the core bits to break loose. Before the drill is withdrawn from an incomplete hole, let the tool run for a short time at the bottom of the hole without removing any material. This will break the chips forming at the bottom of the hole. Always withdraw the drill from the hole with the tool running clockwise.
How can I prevent the core bits from becoming blunt or overheating when drilling?
To avoid these issues, remember good lubrication is essential. Optimal results can be gained with internal cooling via the core bit with a standard drill emulsion.
What should I do if the core bit is chattering?
Check whether the core bit is still sharp. The guides must be set to have no play on the machine. If this isn’t the case, send your tool to customer service. Carefully increase the feed force until the chattering decreases or change the speed if possible. Use caution as too much feed force may result in the tool lifting up.
Why should I use a centering pin?
Use a centering pin to find the exact centre of the drill hole or to eject the slug.
What should I do if the material isn’t magnetisable or is thinner than 12 mm?
If the material doesn’t meet these requirements, you’ll need a vacuum plate and pump, or a suction plate. Check with your power tool provider.
What is the proper way to store and transport core drills?
Store and transport the core drill in its original packaging or at the intended position in the transport box. Core drills should be protected from impact, to prevent damage to the core drill or cutter.
FEIN Canadian Power Tool Company offers a core drilling system for metal in which machine, core bits and accessories are precisely matched to each other. For more information, contact FEIN Canada.
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