Originally Posted by
Thomas91
Good afternoon! I use some bits that break frequently. Now I will try to describe the bits and the speeds that I use.
At first I used straight bits with a cutting diameter of 1.5 mm and a cutting height of 7 mm at a spindle speed of 21000 rpm and a feed rate of 1500 mm / min, vertical feed of 500 mm / min. I cut 6.7 mm spruce plywood in 1 pass with vertical recess. The bits broke. Then he began to cut in 2 passes. That is, at first, the bit was deepened by 3.2 mm. All the same, the cutter broke. Could it be that I chose too high a spindle speed due to which the bit was blunt too quickly?
Then I started using a 2mm corn bit. I cut it in 2 passes. She broke too. Used the same feed rates and revolutions. Please advise what can be done? I understand that plywood should be cut with compression mills or corn with the chips down. But so far these cutters have not been sent to me by mail.