I love the CNC don't get me wrong and mine is working really well, however my spoil board has to be so ridiculously tall. For instance if I want to level my spoil board I have to add even more material just to accomplish this. For instance I have my table which has a 3/4 inch board on it which should be my spoil board, then on top of that I had to build another "table" with more 3/4 inch MDF that sits on 2 inch tall lumber, but I still can't reach that with my leveling bit. In order to make the gantry coplanar with the spoil board I'd need to add at least another 1 inch spoil board on top of everything. In the attached photo, the green lined board is the top of my table.
I have been looking at the Z axis as well.
I have only just started printing the components but feel that the 8mm rods are to small for the loads. My printer has 10mm rods just to support the static weight of a relatively light bed.
I would welcome hearing what people already using the Heavy CNC find.
Mine is completely built and I have cut a few things with it already. I have to say it feels very rigid and I can't see any measurable droop in the gantry and my machine is 1500x1500mm. My real issue is the height of the z. Like I said I've had to add so much height you seriously lose out on the distance 5 1/2 inches you have from the table to the gantry. Not to mention the added expense of adding sheet after sheet. It just adds more problems than it solves. Unfortunately the only way I can see it being more akin to other builds where the z goes all the way down to the table top/actual spoil board is to completely redesign the z.
You should look at dustin Fickert´s redesign. In his design there is more room for the Z-axis to move. He uses a standard CNC-spindle which can be mounted a lot lower. I am using his STEP-file that used Topsie´s design, and still changing that a bit to build my CNC.
Hello ! I'm actually working on this because got the same very boring problem, even more on the Nema23 version, i will post here some news
Awesome to hear Topsie! I look forward to seeing your solution to the problem. In the mean time, once again the design really is awesome and I do love my CNC!
Bonjour,
J'ai réglé ce problème récurent en réalisant ma table support, la hauteur du Z est réglable en continu sur la hauteur par coulissement.
Post : Modif_CNC
Yes, I Actually looked at this in my design, and there is some room for improvement when you use an actual CNC Spindle since it is all a single cylinder and can clamp onto it where ever you like. That being said I will look into this as well. I cannot recall my designed height off of the build table to the chuck. I know I did lower it for this reason.
Just looked at my design again, so from the base mounting of the motor mounts to my chuck, At max zero with where my CNC Spindle is mounted, I have 33.5mm from the base to the bottom of the chuck. Very good reach, almost any bit should be able to zero to the base. But this is a more expensive option than a router.
I am back to printing the parts so hopefully we can see some results from me in a few weeks. :)
Yes and the lower you clamp your spindle, the more you have important counterforce leverage which cause lot of vibrations
