Posted by on 3/30/2022 to
Technical recommendations for drilling with an Annular Cutter:
The annular cutter is designed for drilling holes in steel, copper, brass, aluminum, stainless steel, special alloys and rails.
- Always use a pilot pin
Make sure that the magnetic drilling machine did not move, whilst turning on the magnet.
Pilot pins are essential for the use of annular cutters, as they provide the following practical uses:
- Use the appropriate cutting lubricant; oil, spray or paste
Drilling in vertical and upright positions requires the use of cutting pastes and/or sprays.
- Reasons for the slug being stuck inside the annular cutter
- using too much pressure while drilling;
- Lack or insufficient cooling and lubrication;
- incorrectly selected drilling speed;
- Annular cutter wear;
- Ejector spring wear.
- Select the correct drilling speed
When the drilling speed is more the 25% lower than the recommended speed, we advise to not execute your drilling job.
tungsten carbide Tipped (TCT) annular cutters are more sensitive to excessively low speed, this leads to increased vibration and teeth damage.
High Speed Steel annular cutters (HSS) on the contrary, are more sensitive when recommended values are exceeded by more than 20%.
- Feed Rate
- Construction and stainless steel .......................... 0.08-0.12 mm / rpm
- Cast Iron ............................................................. 0.12 - 0.20 mm / rpm
- Non-ferrous metals ............................................. 0.22 - 0.45 mm / rpm
- Special alloys ..................................................... 0.05 - 0.08 mm / rpm
- At the start of any drilling job, cut the feed from above mentioned recommendations in half.
- Remember that excessive pressure on the annular cutter will not increase performance!
- When drilling fragile material try to drill in one go, so without making stops.
- When processing speed is important then use Tungsten Carbide Tipped (TCT) annular cutters and a magnetic drilling machine with increased rotation speed.
- If you have to apply significant effort, perhaps the annular cutter has become dull or the material being drilled is too hard for this type of annular cutter.
- Maintenance Recommendations
Clean the annular cutter periodically. When drilling holes deeper than 30 mm repeat the following steps every 20 - 30 mm:
- Take out the annular cutter and clean it from the chips;
- Lubricate the hole with cutting lubricate or paste;
- Continue drilling with lower feed.
- Possible causes of annular cutter breakage:
- Lake of cutting Lubricant:
- Always use a cutting lubricant. This will allow you to reduce friction, which means avoiding heating the annular cutter and the material.
- Never use water, car-window clearing liquid, solvents or other liquids as a cutting lubricant.
- It will not only lead to damage of the annular cutter, but also all other equipment;
- Disbalance of the integrated slide:
- Check to see if the machine is adjusted correctly.
- Strong pressure on the feed handle during drilling job;
- Working with parts that are not securely fastened;
- Lap drilling or reaming of already existing holes;
- Damaged drilling chuck;
- Low magnetic force due to a damaged magnet, uneven or dirty metal surface, foreign objects between steel and magnet;
- Drilling of profile metal and steel of variable thickness
- Working with multilayer material, such as sandwich panels:
- In this case it's better to use special 'stack' annular cutters
All these factors directly affects the conditions and lifetime of the annular cutter.
Therefor, if you want to expand the lifetime of your annular cutter and achieve maximum efficiency,
keep these factors in mind and never forget to check all other machine components.
