Saturday, December 12, 2009
Most of the electronics I've ordered for the lathe has arrived by now. Still waiting for the servo-drive for the main spindle. Bottom left are three switched-mode power supplies: 5V 3.5A (logic etc), 12V 3.3A (brushless amps, E-stop chain, etc), 24V 1.3A (spindle brake) Bottom right are two Chinese 350W 48VDC 7.3A power supplies for [...]
Digikey corrected their mistake and shipped The Real McCoy to me today.
Thursday, December 3, 2009
This PCI-card with an FPGA and 72 I/O lines will be used to control the lathe. $199 from Mesa electronics
Sunday, November 29, 2009
The 1.75kW spindle-servo for the lathe only has resolver and hall-feedback. So I need to mount an incremental encoder with index pulse on it myself. The rotor for the hall-sensors attaches to the main motor shaft with an M6 bolt. Here I'm making my own M6 bolt with a long 'head'/shaft that will extend outside [...]
Tuesday, November 24, 2009
Figured out the hall- and resolver-signals on the spindle servo today. There are two scope-pictures but the hall signal corresponding to the third phase is also OK, I just didn't save the screenshot. The pinout seems to be: 1: resolver a+ 2: resolver a- 3: resolver b+ 4: resolver b- 5: resolver c+ 6: resolver [...]
Tuesday, November 24, 2009
These Solidworks screenshots appear elsewhere on the interwebs too, but let's store them here also for reference.
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Monday, November 23, 2009
(the dial indicator reads in metric, with 1um resolution) radially the spindle chuck-flange shows ca 14-15 um of runout. Axially there is more wobble, ca 20um. The Z-rails are very accurately aligned in the X-direction, I measured ca 6um error. Measuring in the Y-direction, there seems to be a 40-50um jump around 10cm from the [...]
Monday, November 23, 2009
A closer look at the spindle-servo today. Googling for the model number does not immediately yield a datasheet, although I found a few similar-ish model numbers. The high-power connector is simple with U, V, W phases, Protective Earth, and +/- terminals for the solenoid brake. The brake opens at 24V and 0.67 A. The back [...]
Saturday, November 21, 2009
I've bought a cnc-lathe! Well, it's not complete, more of a cnc-lathe project. A fellow Finnish cnc'er "JHQ" started this project a few years ago, but as he now has a 5000 kg professional cnc-lathe and his own company, he hasn't had time/money to complete this project. There are many project logs out there with [...]