1000mm

 

My spindle is 1.5kW, so I will see. If the deflection is too much I will reinforce the cBeam with a steel angle iron on the back side through bolted to the cbeam. May do that right from the start, can not hurt to be stiffer.

 

My other option would be to add a second cbeam to the back side and bolt em together. But I am leaning towards teh angle iron approach.

 

I have a 1x1m Sphinx. While I can't give you accurate deflection numbers I can offer some experiences. I'm using a Makita router (about 800w) and have never felt that I need more power. I think the rigidity of the machine is not enough to push the router to its limit. I have done some aluminum machining and never came anywhere close to 800w without the machine starting to act up.

I guess what I'm saying is that on a Sphinx with a long X axis (or any C-beam construction I guess) going to 2.2kw is overkill. The only thing I'm missing with the Makita is to have the ability to lower RPMs and go slower.

Anyhow, my $.02

 

I run a 800w spindle on my 1000mm axis. I do not believe that it causes any concern able amount of deflection. However, me being me, I've been thinking that I do want to do something. So here is what I am thinking about. Again, this is not a critical project at all in the long list of projects.

Anyway, I would get a piece of 1000mm long and figure 1/4" or 3/8" thick cast plate, cut to size, drill holes, and attach it to the backside of the C Beam, obviously with most of the weight off the Z axis. That would make the C beam super strong, add some mass to it, and hopefully reduce deflection if any.