450x300 Aluminium extrusion build from scrap/used parts

[Nealieboyee]

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?

[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


Verstuurd vanaf mijn SM-A320FL met Tapatalk

[Nealieboyee]

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.

Whoops....I just placed a sketchup model of the 2.2kw spindle into my model and the tip of the collet was touching box section. I'll need to add....how much below that? 100mm, 150mm?

What material thickness are you looking to cut?

With that z height, 0mm lol. I'm hoping go from 0 up to 30-40mm.

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.

Nope. I ordered plain finished ballscrews which couple directly to the steppers.
Would 3.1Nm steppers be enough here or should I go to 4Nm? Just realised I only ordered three ball screws, and I'll need a second one for the Y axis...I'll have to get one locally or add it to my order for the spindle and electronics from Fred.

Did i forget anything?

Does it look rigid enough with 50x50mm square tube?

Thanks very much for taking the time to answer my questions. Much appreciated.