Z axis reduction question

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

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

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Originally Posted by Ger21

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

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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
Attachment 24715

I'd use 1:1