Luke11CNC Build Log ,I'm so naïve

[luke11cnc]

Just a little update on progress

I have received the following Items

8 SC20UU x 4 pcs Linear Ball Bearing these are for y,z axis
4 SK20 Shaft Support ID20mm Samic
3 X Stepper Motor - 3 Nm, CNC Mill/DIY

and I have ordered the following

three stepper mount for the above stepper motors from Jonathan Thank you Jonathan
Ball screw support ordered again from Jonathan
and -RM1605-1100mm with ballnut and end mached+ a set BK/BF12+1pc Coupler 8mm*10mm(8mm is for motor shaft) SBR25-1100mm(2supported rails and 12 bearing blocks)

Next on my list is the aluminium extrusion but not until I work out the size of my bed
I believe a thread lenght of 1063mm from a shaft length of 1100mm but I haven't decided the (y axis) length yet I think I may go with 700mm witch should give me a cutting footprint of 900x500?

the intended usage of this machine is oak,MDF,pine,acrylic and small amounts of aluminium (and even a plotter cutter for my wife crafting)

I have uploaded Draft sight and working on using it



James

[Jonathan]

I have received the following Items

8 SC20UU x 4 pcs Linear Ball Bearing these are for y,z axis
4 SK20 Shaft Support ID20mm Samic

You're not using supported rails then

and I have ordered the following

three stepper mount for the above stepper motors from Jonathan Thank you Jonathan
Ball screw support ordered again from Jonathan
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Will be ready by tomorrow...

RM1605-1100mm with ballnut and end mached+ a set BK/BF12+1pc Coupler 8mm*10mm(8mm is for motor shaft) SBR25-1100mm(2supported rails and 12 bearing blocks)

12 bearing blocks!! That seems a bit extreme for two rails. I wonder how much difference it would make if you used more than two blocks per rail...

Anyway, centre height of the BK12 block is 25mm and total height of the SBR25 rail and block is 60mm. That means I need to make the centre height of the ballnut mount 60mm-25mm=35mm. Do you agree?