![]() The other thing is when one starts to drill the hole, one must keep a good even pressure on the drill, as if one gets tired and takes the pressure off the drill, the but will be turning but won't be getting a bite, so will heat and the tip of the bit can go dull/blunt. Bosch CYL-5 2608588140 Straight Shank Impact Stone Drill Bit 5mm x 100mm. One in position, one just drills through the predrilled holes in the template, so there are no issues marking or centre punching holes, or the drill bit slipping as it makes the initial cut. ![]() This can be clamped to the steel to be drilled with g clamps or a couple of vice grips. If the holes are in a cluster/pattern, the secret is to make up a template out of a bit of scrap steel plate. The other thing is when one starts to drill the hole, one must keep a good even pressure on the drill, as if one gets tired and takes the pressure off the drill, the drill bit will be turning, but won't be getting a bite, so will heat and the tip of the bit can go dull/blunt. Once in position, one just drills through the predrilled holes in the template, so there are no issues marking or centre punching holes, or the drill bit slipping as it makes the initial cut. ![]() He was convinced the battery drill would not be up to the job, but it did it no bother. I drilled 40 off, 10mm diameter holes in 10mm plate recently with the battery drill, much to the amazement of the man I was working for. It is possible to get a conventional chuck to fit the magnetic drill which can be used for conventional twist drill bitsĦmm diameter holes are not really an issue. Yes, the smallest broach cutters available for the magnetic drill are 12mm. Click to expand.Good advice, with the cutting fluid.
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