need help! choosing right kit

[JAZZCNC]

Well you really have got a problem with this selection because the motors and PSU voltage don't match together well.

R&P needs the JK86HS78-5504 (NM 4.6 - 651 oZ 5.6A 3.4mh) or the JK86HS115-4208 (NM 8.7- 1232 oZ 6A) and with only 60Vdc you don't have enough voltage to get good performance from these.

The JK57HS112-3004 (NM 3 - 425 oZ 3A 6.8mh) are not suitable for R&P and are better suited to 1610 ballscrews but again with only 60V and high inductance the performance will be lower. They really need 70+Vdc to get good performance.

My advise would be don't buy any of them has they are not matched nice but if I must choose then I'd say go with 3Nm and 1610 and build to this size.

If you can push the Voltage upto 70-74Vdc and use toroidal transformer PSU then you could get away with JK86HS78-5504 (NM 4.6 - 651 oZ 5.6A 3.4mh) and 28T R&P with 5:1 ratio.
This would give pitch equal to 22mm (Mod1.25 28T DP = 35 x pi / 5=22 ) which would give decent resolution for wood and good speed so you could tune motors down so they run slower where torque is higher and still maintain good feed rates.

Really the only motors you can use are the JK57HS112-3004 (NM 3 - 425 oZ 3A 6.8mh) and JK86HS78-5504 (NM 4.6 - 651 oZ 5.6A 3.4mh) and both these need more voltage, esp the 4Nm 34's.
The JK57HS112-3004 (NM 3 - 425 oZ 3A 6.8mh) with 70Vdc would perform best.