Hey there,
I'm scavanging for stuff to build myself a router. I want to be able to mill at least aluminium. I've drawn up a nice concept in AutoCAD and started to get the required materials. The concept is such that at first I will use the skate bearing liniear bearings and have the possibility to upgrade to THK style. The frame will be all aluminium (60x60x4mm) and the machine will me a moving gantry. I plan on using a Kress 900w router as a spindle.
Last friday a visited my local scrap dealer (as I do about once a month) looking for stuff I could use (read THK style rails). I asked If he had any steppers and he showed me a room I hadn't been to before and it was loaded with all kind of actuators. Big motors, cilinders, etc...
Wandering about in it I stumbled upon a pot of gold. There was a large bucked full of bearings, pulleys and 5 large servo motors.
4 Dunkermotor 63x55 with planetary gear box 7:1
2 with brake and encoder 500cpr (one encode busted beyond repair)
2 without brake but with encoder 500cpr
1 Dunkermotor 55x30 with planetary gearbox 7:1 with encoder.
At the moment I'm cleaning the motors and I'm inspecting them. I'm also replacing the power wires as those morons cut the too short. I've run the motors on 34V and they run very smooth. Gearbox is silent and has almost no play in it.
I play to use 2 of the larger motors for my x and y axis and the smaller one for the z. That way I have to two largest axis (1200 and 500mm) with the largest motors. The Z axis (300mm) will be the lightest axis of course.
The two remaining motors can then be used to cnc my lathe in the near future.
What would you guys do.
Is this a good plan or should I give the Z axis the same motor.
Would these servos have enough power to drive a lathe with 500mm between centers. Would you use them with or with gearbox.
Any other advise. I plan to build the servo controller that is being developed at www.cncecke.de under forum Elektrik. This controller is roughly based on http://elm-chan.org/works/smc/report_e.html .
Erik Jan