First off I'm a newbie to posting in pretty much any forum. I've been lurking in the back ground for quite a while and finally decided to get off my duff and actually build a CNC table. I have read through must of the posts and did a search of posts that talked of using V bearings. I basically have a question concerning a couple of designs I have seen.
Specifically I'm looking at how Mechmate uses the V bearing on the X axis with a Machine gear below the rail, the drive moter is mounted on a spring loaded pivot. This seems to me a very simple and fairly low cost alternative to Linear bearings. I would like to build my gantry for the Y axis from either extruded aluminum or 80/20. My concern is that other than the spring loaded motor contacting the drive gear there is nothing to counteract any deflection when the router engages the material and I will loose some accuracy. I have to assume that the weight of the Mechmate gantry is enough that there is sufficent pressure that this is a non issue. It seems everyone that is using this desin is pretty happy. Does anyone have experience using this design for the x axis. I'm shooting for a 5' x 10' cutting area.
Since I need in excess of 10' of bearing surface this seems to be the most economical option for the X axis. The company I work for uses a HT2000 with a table that uses a V bearing design, I can see this working great for Plasma / Torch since nothing actually touches the work surface.
Any input either way is greatly appreciated or point me to a thread that has already discussed this.