welding steel base or just getting aluminium extrusion

[reefy86]

Hope you all have a good Christmas guy's

[reefy86]

is it possible to combine a 4th axis capable of cutting up to 200x200mm to my design? i am struggling to figure out how i would without having to adjust the z height, my plan was to adjust the width of the machine to allow me do add a t track to the side of the machine which does not affect the spoil board so i can adjust the 4th axis length so maximum cutting for the 4th axis would be 2400mmx200mmx200mm. So far my z height already has a cutting height of 200mm so if i was to somehow add the 4th axis i feel as if i would now need to adjust my z height to around 300mm and i have no idea how weak it would make my z axis doing this.

[Desertboy]

http://www.chinasavvy.com/tolerances...tnessroughness

[EddyCurrent]

What about this idea; https://www.cnccookbook.com/wp-conte...atheAttach.jpg
or put it at the end in a smiliar manner.

[reefy86]

Thanks eddy :)

[Boyan Silyavski]

Just responded you to the PM, but now i see here where you are going with that. There is absolutely NO NEED for the spindle to extend below the table bed in order to achieve good 4rth axis

Meaning that the centerline of the round object could be level on with your bed. And the Z gantry clearance will be your object max radius. Add 10cm for the bit and chuck. There should be your spindle in upmost position. i recommend boxing the spindle like on mine machine and making tha gantry a bit wider in vertical. So more or less a normal machine without too much mods except for strong Z. thats it

[cropwell]

I recall a build by KingCreaky that had a removeable bed that allowed a 4th axis to bolt in (can't find the thread though).

[reefy86]

been over thinking again lol but that's the fun of reading tons of posts on this forum and coming up with new idea's (stolen idea's). just out of interest whats the price difference between good stepper motors and servo motors now? because of my high z axis i need to make the gantry very beefy but after reading some more for 3d work the z front plate needs to be light so i will update soon on an updated version and see what you think.