Z axis reduction question

[marbles]

I am in the middle of my second build. I’m going for a long Z axis 500mm. 1500 x 1500 table. The z axis is getting pretty heavy. (might start a build log)

I bought 4:1 HTD reduction belt and pulleys to give the Nema 24 566oz in a bit of extra torque to assist the Z. The X, A and Y also have 4:1 HTD reduction units. However I now realise i’m slowing the whole feeds and speeds down with reduction on the Z. The first machine was 1:1 throught

Just looking for suggestions about other solutions before make up the nema bracket and fitting it today.

Thanks

ps got the 2DM556 drivers set on 3.8 Amps Half Current 1/10th Microstep for the 4Nm steppers perhaps could change the these settings

[Ger21]

What are you using to move the Z axis? Ballscrew? What pitch? How much weight are we talking about?

[marbles]

What are you using to move the Z axis? Ballscrew? What pitch? How much weight are we talking about?

RM1605 C7 650mm ballscrew
700x150x12.7 alu plate for the Z travel
HG20 rails mounted on that plate
2.2kw air spindle
approx total weight for travel plate, rails and spindle 12kg

pic without guide blocks or travel plate
24715

[Ger21]

I'd use 1:1