Re: New Machine Design
Use individual TB6600 drivers instead of the 4 axis board. When one blows you can replace the single driver. If you just gotta use the multiaxis TB6600 board then use low voltage. Maybe 24 volts. Mine burnt with 36 volts and I have heard people say it is the higher voltages that cause the problems. Never had a problem with the individual drives.
It looks like a really long distance from your gantry bearings to where the Z axis is connected to the gantry. This makes for a long moment arm for the cutting forces. And supported rail bearings are weakest for forces pulling the bearing away from the rail vertically. You might want to reduce the height under the table as much as possible and gusset the gantry uprights.
John C
carpenterswoodworking.com