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General Mach Discussion / Bit diving when doing tabs
« on: March 05, 2012, 07:50:25 PM »
Hello folks,
I am having an issue whilst adding tabs to a job. A "standard" scenario would be simply cutting out say, a 2" circle out of 3/4 MDF. I add the tabs via LazyCam, usually 4 of them at .4" wide and .125" high. With a 1/4" bit, the tabs are left just a bit wider than 1/8" (.15) which seems to be about right. In a "just chunk it out" cut, I would be doing the cut as (3) 1/4" deep passes.
The issue is that, during the first pass at cutting the hole out (first pass, at 1/4" deep) the machine "dives" down to cut the tab. After passing the tab, the bit is raised back to the 1/4" depth and the cut of the circle continues. As the next tab is reached, the cycle repeats. So far, in MDF and with a fairly slow feed rate, the bit and router have handled this sudden 5/8" deep cut. I would like to remedy the issue however.
My machine and build updates can be found here:
https://sites.google.com/a/rocketbrandstudios.com/rocket-brand-studios/cnc-project
I appreciate, in advance, your time.
I am having an issue whilst adding tabs to a job. A "standard" scenario would be simply cutting out say, a 2" circle out of 3/4 MDF. I add the tabs via LazyCam, usually 4 of them at .4" wide and .125" high. With a 1/4" bit, the tabs are left just a bit wider than 1/8" (.15) which seems to be about right. In a "just chunk it out" cut, I would be doing the cut as (3) 1/4" deep passes.
The issue is that, during the first pass at cutting the hole out (first pass, at 1/4" deep) the machine "dives" down to cut the tab. After passing the tab, the bit is raised back to the 1/4" depth and the cut of the circle continues. As the next tab is reached, the cycle repeats. So far, in MDF and with a fairly slow feed rate, the bit and router have handled this sudden 5/8" deep cut. I would like to remedy the issue however.
My machine and build updates can be found here:
https://sites.google.com/a/rocketbrandstudios.com/rocket-brand-studios/cnc-project
I appreciate, in advance, your time.