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Discussion in 'CNC Mills/Routers' started by mikework, Oct 9, 2017.
1M C-beam xy variant
mikework published a new build:
Read more about this build...
I am really looking forward to any feedback during this.
Right now I am thinking of cutting the 4th c-beam into 2 375mm legs for the gantry and 250mm for the z-axis c-beam.
I guess if that is too short for a 1.5kw spindle on the Z axis I can always replace just that piece.
Any thoughts folks?
Got some more work done over holidays. Its not bolted down yet as I want to get some electronics installed and test the motion before locking it to a surface. As is, its very rigid.
All aluminum plates cut and drilled by hand. I can not wait to be able to machine these instead by hand as tolerances HAS to be waaaay better.
Also discovered I had to improve my tablesaw 90 degree cuts of the c beam ends as I was getting some serious motor shaft to leadscrew misalignment.
Thanks to William Ng's '5 cut method' for tablesaw crosscut sled alignment the c-beam ends are now within .9991% tolerance of 90 degrees.
Z plate was sized for 2.2kw spindle which will be one of the last upgrades. I have a beater router I can test with for now.
4 Thread 8mm leadscrews are used for y and x, but I will stay with the 2 thread 8mm to help the 275oz stepper motor haul that 5 kg 2.2kw spindle up and down. Other axis are using 425oz steppers.
Finding a source for lock collars locally was ridiculous so I drilled out some standard nuts and added 2 60 degree offset setscrews.
Stepper motor spacers came from electronics spacers stash. Wide variety of lengths employed.
'Y' / Gantry support plates cut wider for extra stability. I may add more wheels to all plates based on performance.
V Slot calculation spreadsheet indicates a total .06 mm deflection (total weight 11.5kg with spindle) in side c-beams so I may go to a 2 sided support Y plate 'sandwich' instead of supporting the beam in the middle.
Waiting now for a Arduino Uno to install GRBL on to. This will run the 4 DM542 drivers for each stepper.
Sorry for lower picture resolution, main camera has hidden charger over holidays.
Just a thought. Seeing as how you have a little room left at the top of your towers, why not strap a piece across the top of them, with a plate and some wheels attached to the Z axis, to act as a brace for the Z axis and remove the chance of a pivot point, or router/spindle nodding.
Very good point.
Might as well, the 'towers' were left tall to allow me to change the Z depth depending on stock or project needs.
IF there was a need. I am very much still in 'Discovery' mode.
It will have to wait till I get more aluminum extrusion. A 20x80 piece oriented facing down should do the trick nicely.
Thank you for the great observation!
Project named after other hardworking dwarf of Norse mythology.
Not that his brother was a slouch...he just is getting all the credit lately.
@mikework looks like you are up and running with a really nice setup , well done brother
Looking forward to seeing the projects rolling of this one