i'm looking to build a machine for drilling holes in aluminum, i would like to be able to control the spindle speed with the openbuilds cam / black box, does anyone know if this is possible?
Yes, if you have a suitable spindle like a VFD: docs:blackbox-x32:connect-vfd [OpenBuilds Documentation] or even a Kress/AMB, any spindle that accepts a 0-10v speed signal essentially.
Could use the Coolant output docs:blackbox-x32:connect-coolant [OpenBuilds Documentation] Have a read through all the documentation