Project Beaver

[njhussey]

Looking good, my only comment is I think you'll regret it not being able to machine 1200 x 600 especially as you're nearly there. My machine can (just) do 1000 x 600 and I wish I could put 1/4 sheets of wood in to machine!

[OMLCNC]

Looking good, my only comment is I think you'll regret it not being able to machine 1200 x 600 especially as you're nearly there. My machine can (just) do 1000 x 600 and I wish I could put 1/4 sheets of wood in to machine!

Ok Neil, I can get the extra length in the workshop so I will change the design to use 1400mm HGR20 rails. I can see from the forum that some people rattle off a machine in a mouth and some people never get finished. It's a constant loop of reading, learning, redesigning etc, etc, but it only costs time. I'm finding it very useful to do a "Bill of Materials" as I go for costs and to make sure I haven't forgotten anything. I'll post it when I finish that and the next revision design.

[Boyan Silyavski]

Just the other day i was looking at my Z axis thinking" Good that i invested much time and money there, so no i dont need to move table up and down" ,not that i could lift 300kg table anyway. In other words i prefer very strong Z that could reach down and do the job without need of additional fiddling around.
When i was designing my machine i had the idea of using additional support to lift the material, but as i made it OTT, in fact i do not need anything additional.

So that is my advice.

[JAZZCNC]

Looking good, my only comment is I think you'll regret it not being able to machine 1200 x 600 especially as you're nearly there. My machine can (just) do 1000 x 600 and I wish I could put 1/4 sheets of wood in to machine!

Neil is Spot on. The little extra will make all the difference.

HOWEVER there are few things that need to be considered because that little extra length can give issues with Whip.
Use 20mm screws with BK Fixed bearings on each end for stabilty. Use 20mm pitch and apply 2:1 Ratio.
This will half the screw speed while still giving same speed as 10mm pitch. It will also double the torque and reduce the chances of stalled motors which is important when using slaved motors.