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View Full Version : is there too much going on with the z axis?



reefy86
14-09-2016, 10:54 PM
trying to keep machine as rigid as possible but i feel as if adding the plate at the back to support the rotating nut its going to course problems or would you say its fine?

Ash

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Davek0974
15-09-2016, 08:16 AM
I wouldn't bother, it will bring little to the table :)

That Z axis is almost a direct image of mine, 20mm la tooling plate all round, slotted & bolted joints.

My one is not so tall, the motor is lower and hangs over the X screw.

If you can, slot all the joints - it makes them firmer and keeps it all square.

Boyan Silyavski
15-09-2016, 08:59 AM
No need for rotating nut there!?! How long is the X travel? I have 1610 screw on my machine, with both sides rigid end supports/ made to mill aluminum/ and my travel is ~1300mm, ball screw length is 1520mm/ including end machining both sides for the fixed supports/

No whipping or whatsoever at 20000mm/min and 3000mms2 acceleration, though for the moment i run it at ~7000-10000 machining wood, which also is quite fast.

magicniner
15-09-2016, 09:45 AM
If you went for an I-Beam for your cross member you could increase it's rigidity whilst bringing the ball screw much closer to the line of the slides, losing the outrigger and increasing rigidity there too,

- Nick

reefy86
15-09-2016, 12:49 PM
total ballscrew length is 1800mm and travel is 1300mm, only reason for rotating nut is incase of whip as im mostly cutting wood so 10000/min is my goal

Ash

reefy86
15-09-2016, 04:19 PM
just out of curiosity, when determining the z axis height do you measure to the collet?

Boyan Silyavski
15-09-2016, 05:32 PM
total ballscrew length is 1800mm and travel is 1300mm, only reason for rotating nut is incase of whip as im mostly cutting wood so 10000/min is my goal

Ash

1610 screw is no good for that length. 2010 or as you have designed it is even better, but more expensive.