According to the specifications sheet on the home page, the distance marked “B” between the rails is 37.75". The cutting area is designated as 32.25" which is 5.5" smaller, dividing that in half would leave you 2.75" of clearance between the rails on each side. I am assuming the center of the router when up against the rail would be that 2.75" from the stop.
Hope this helps. I don’t have my machine yet, just looking at the specification sheet on-line.
Hi Grant - where did you get the 37.75 measurement from? The spec sheet I’ve seen says 38", but doesn’t provide the width of the gantry bearings or the thickness of the Z-slider to know where the bit might be relative to the axises.
By no means did I try to give anyone the wrong information and I sure hope this problem doesn’t bite someone in the butt before it’s clarified by Onefinity. I have yet to start on my table build (machine is due in Jan '21.
Hey Grant - no worries; the differences are minor. If someone is designing their waste board to a 1/4" accuracy and that 1/4" is crucial, then I’d ask them to question life a little more fundamentally
I’m just trying to get the core dimensions into Fusion, which is proving quite challenging, but I think I’m done now. Just need to decide exactly what kind of waste board I want (T-Track, Dog Holes, 1/4-20, etc.).
I have t-tracks on my current machine and they have served me well. I think I am going that way again but want to add some locating pins for other things and maybe go to a more sacrificial type of clamp to save on the errant tool path and machining aluminum.
then I measured (as best I could) the difference. I used a woodpeckers square in the 80mm mount bottom, and placed drill bits in the 65mm bottom. The best fit drill bit (I only had imperial) was 19/64".
I would not suggest using this to machine parts, but if you’re looking for the spindle centerline differences in the Y-axis between the 65mm mount and the 80mm mount, this should get you pretty close (19/32", or about 15mm)
your photo shows very well how close the center of the milling motor is to the Z rails on the Onefinity CNC with the original 65 mm mount. The milling motor sits nearly “between” the Z rails.
There have been many discussions in this forum(1) about universal spindle mounts or replacement Z sliders, but they all had to admit that with mounting another motor mount or even another Z axis assembly, the center of milling motor would move away from Z and X rails and therefore would increase the leverage force that the milling motor weight and work load would exert on them - with doubts of many on how the Onefinity CNC would deal with it then.