450x300 Aluminium extrusion build from scrap/used parts

[driftspin]

Hello all,
Been a while, but this is still being built. My linear rail, bearings, ballscrews, supports etc from Fred at BST should be here in a few days. Can't wait. I've changed my design a little bit. It will now be bench mounted, so the base is a lot shorter. See below. I've also swapped out the aluminium extrusion in favour of 50x50mm steel box section. Space isn't a major problem, so I don't have any problem with the motors sticking outside the envelope of the machine. Other than that, is there any other reason I should go with belt driven ballscrews?

Any thoughts?

Hi Neely Boy,

What is your free Z height ?


Looks like there will be very little room left for clamping solution spoilerboard and length of the cutter...


Maybe you could lower the bed in your design a little to free up some space.


What material thickness are you looking to cut?


Beltreduction has some advantages.

-Foot print
-Option to change steps per mm later on.
-Noise reduction.
-Less stepper vibration transfer to cutter.


Also you can gain speed vs ballscrew rpm
when you raise the pitch of the ballscrew
and "belt pulley reduce" the ballscrew rpm vs stepper without losing resolution.
This is usefull when you hit the critical rpm for a given ballscrew/pitch vs speed.

Also some high pitch screws tend to be more efficient.

But since you already ordered this is a non issue..

Did you order ballscrews prepped for pulleys? I ordered mine with a slightly longer F lenght shaft... 30mm of pulley shaft.

Hope this helps.
Did i forget anything?

Grtz Bert


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