basewhe.blogg.se - Deskcnc controller

I used the clamp type Oldham couplings, and used a little Locktite threadlocker on the threads before adjusting them to their final position. Photo 1 shows one of the threaded coupling halves in place on the X axis. This has the advantage of keeping the leadscrew extension as short as possible, so the motors stick out a little less. I realised that by threading the leadscrew half of the Oldham coupling M12 it could perform two jobs - adjusting the end float and coupling to the motor. It is necessary to provide end float adjustment for the thrust bearings on these axes. I decided that the X axis nut was just big enough to be machined out to hold a ballnut, which saved a little time and effort. Dick modified the existing bronze Acme feed nut for the Y axis to act as a mount for the ballnut, but replaced the X axis feednut with a new, slightly larger piece of bronze machined to fit in its place. Installing the leadscrews in the X and Y axes proceeded pretty much as Dick described in his articles (MEW December 2004/January 2005). As some of these detailed differences may be of interest to other would-be CNC-ers, I decided to put together a small article to describe them. The overall approach I took was broadly the same as Dick has described - replacing the leadscrews on all axes with 2mm pitch THK ballscrews, using size 23 stepper motors, and so on however, my conversion differs in a number of details from Dick's. Dick kept me updated with his progress as he performed his conversion, knowing that I planned to do a similar conversion in due course, so I not only had the benefit of seeing his articles before attempting my own conversion, but also the benefit of having talked through some of the techniques with him at various times. Introductionĭick Stephen has written extensively in Model Engineers' Workshop magazine of his experiences with CNC conversions, and most recently on converting an X3 mill to CNC.