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A Passive Automatic CNC Tool Changer



[Marius Hornberger] has been busy hacking his “Hammer” CNC router once more, and now it sports activities a a lot desired characteristic — an automatic tool-changer. Having wished one for some time, [Marius] was sad sacrificing an enormous chunk of useable mattress space simply to park the tool-changer journal. An apparent resolution can be to have the journal retract away from the mattress, exterior of the working space. Sadly, the CNC controller had solely sufficient spare outputs to drive the pneumatic instrument changer (mounted on the spindle) leaving none spare to manage the journal meeting. So, there was just one apparent path to take, use some easy spring-loaded mechanics to maneuver the journal into tool-picking vary with the Y axis movement as a substitute.

Clearly, the entire thing is CNC machined on the machine itself, taking solely a few iterations and smidge of table-saw motion to get every little thing to suit effectively and function easily with out binding or colliding with the shifting gantry. A crafty pair of levers on every finish of the journal permit it to maneuver a lot additional than the advancing gantry, swinging it rapidly into place when the Y axis is on the excessive of its journey, and retracting away when the gantry strikes again. One other good addition to the construct was a instrument depth sensor (AKA: a change) mounted off to 1 facet, which permits the machine to seek out the underside of every instrument, if it isn’t recognized, so the Z axis can compensate. When mixed with the mechanically retracting mud shoe, this can be a undoubtedly a CNC construct we’d like to see in a store close to us!

We’ve had a good few CNC hacks over time, together with instrument changers, like this one, however 3D printers can use some tool changer love too!

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