Hello Momus Builders,
I have been lurking on the forums looking for a machine for some time, I finally came across Momus on Youtube and immediately purchased the plans.
I am looking to build a 500x500 (mm!) Momus, that is built for cutting Aluminium, though wont be its only task.
The reason I chose Momus was it's current ability to cut Aluminium on a large bed, albeit slow or many passes compared to a mill. I'm hoping to stiffen it somewhat further to get the most I can out of it.
I would like to use dual ballscrews on Y axis and a single on X (or dual on X and single on Y - depending on how you want to name the axes!), as this machine is still primarily for other materials (delrin/acetyl, MDF, etc) I don't particularly want it to be slow just for the sake of cutting metal.
I therefore think something like 5mm pitch would be appropriate solution for all axes, what do you think? At 2000steps/rev that's still 0.025mm/step, which I'm sure is better than the tolerance of the leadscrew I use.
Another change I am thinking about is using steel for the XZ carriage parts for extra stiffness, at the cost of more weight. I see this advantageous as the cutting force has to first fight the added weight before deflecting the X bar during cutting.
The final change is aluminium extrusion or steel welded section for the U shape and two ledges that make up the bed, walls and Y axes supports. The outer will still be plywood so will still look the same as the fantastic Momus design. This change is so I can use fluids on the bed without getting the wood wet and to add greater stiffness across the X axis.
I have access to a manual mill so during conversion of the parts to Metric I will also make the pieces more complex allowing for a reduction in parts (and stack up tolerances).
I would quite like to use Vee rail and pulleys, but so far have only learned that unless the pulley has dual bearings it will deflect from side loads, which is useless. Perhaps it is easier and cheaper (and looks cooler) to use the roller bearings in the current design.
Let me know your thoughts,
Thanks,
Tom
I have been lurking on the forums looking for a machine for some time, I finally came across Momus on Youtube and immediately purchased the plans.
I am looking to build a 500x500 (mm!) Momus, that is built for cutting Aluminium, though wont be its only task.
The reason I chose Momus was it's current ability to cut Aluminium on a large bed, albeit slow or many passes compared to a mill. I'm hoping to stiffen it somewhat further to get the most I can out of it.
I would like to use dual ballscrews on Y axis and a single on X (or dual on X and single on Y - depending on how you want to name the axes!), as this machine is still primarily for other materials (delrin/acetyl, MDF, etc) I don't particularly want it to be slow just for the sake of cutting metal.
I therefore think something like 5mm pitch would be appropriate solution for all axes, what do you think? At 2000steps/rev that's still 0.025mm/step, which I'm sure is better than the tolerance of the leadscrew I use.
Another change I am thinking about is using steel for the XZ carriage parts for extra stiffness, at the cost of more weight. I see this advantageous as the cutting force has to first fight the added weight before deflecting the X bar during cutting.
The final change is aluminium extrusion or steel welded section for the U shape and two ledges that make up the bed, walls and Y axes supports. The outer will still be plywood so will still look the same as the fantastic Momus design. This change is so I can use fluids on the bed without getting the wood wet and to add greater stiffness across the X axis.
I have access to a manual mill so during conversion of the parts to Metric I will also make the pieces more complex allowing for a reduction in parts (and stack up tolerances).
I would quite like to use Vee rail and pulleys, but so far have only learned that unless the pulley has dual bearings it will deflect from side loads, which is useless. Perhaps it is easier and cheaper (and looks cooler) to use the roller bearings in the current design.
Let me know your thoughts,
Thanks,
Tom